JSP邮箱小案例(完成全部功能)

本系统案例采用三层案例 实现:

1.Bean对象

MSgBean对象

package com.edu.bean;

import java.sql.Date;

public class Msg {
    private int MsgId;
    private String MsgUsername;
    private String MsgTitle;
    private String MsgContent;
    private int MsgState;
    private String MsgSendto;
    private String MsgCredateDate;

    public Msg() {
    }

    public Msg(String msgUsername, String msgTitle, String msgContent, String msgSendto) {
        MsgUsername = msgUsername;
        MsgTitle = msgTitle;
        MsgContent = msgContent;
        MsgSendto = msgSendto;
    }

    public Msg(int msgId, String msgUsername, String msgTitle, String msgContent, int msgState, String msgSendto, String msgCredateDate) {
        MsgId = msgId;
        MsgUsername = msgUsername;
        MsgTitle = msgTitle;
        MsgContent = msgContent;
        MsgState = msgState;
        MsgSendto = msgSendto;
        MsgCredateDate = msgCredateDate;
    }

    public int getMsgId() {
        return MsgId;
    }

    public void setMsgId(int msgId) {
        MsgId = msgId;
    }

    public String getMsgUsername() {
        return MsgUsername;
    }

    public void setMsgUsername(String msgUsername) {
        MsgUsername = msgUsername;
    }

    public String getMsgTitle() {
        return MsgTitle;
    }

    public void setMsgTitle(String msgTitle) {
        MsgTitle = msgTitle;
    }

    public String getMsgContent() {
        return MsgContent;
    }

    public void setMsgContent(String msgContent) {
        MsgContent = msgContent;
    }

    public int getMsgState() {
        return MsgState;
    }

    public void setMsgState(int msgState) {
        MsgState = msgState;
    }

    public String getMsgSendto() {
        return MsgSendto;
    }

    public void setMsgSendto(String msgSendto) {
        MsgSendto = msgSendto;
    }

    public String getMsgCredateDate() {
        return MsgCredateDate;
    }

    public void setMsgCredateDate(String msgCredateDate) {
        MsgCredateDate = msgCredateDate;
    }
}

User对象(用户登陆注册实现的功能)

package com.edu.bean;

public class Users {
    private  int UserID;
    private  String UserName;
    private  String password;
    private  String Email;
    private  String Name;

    public Users() {
    }

    public Users(int userID, String userName, String password, String email, String name) {
        UserID = userID;
        UserName = userName;
        this.password = password;
        Email = email;
        Name = name;
    }

    public Users(String userName, String password, String email, String name) {
        UserName = userName;
        this.password = password;
        Email = email;
        Name = name;
    }

    public int getUserID() {
        return UserID;
    }

    public void setUserID(int userID) {
        UserID = userID;
    }

    public String getUserName() {
        return UserName;
    }

    public void setUserName(String userName) {
        UserName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getEmail() {
        return Email;
    }

    public void setEmail(String email) {
        Email = email;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }
}

2.Dao

数据库连接Dao

package com.edu.dao;

import java.sql.*;

public class BaseDao {
    final static String url="jdbc:mysql://localhost:3306/aemail?characterEncoding=utf8";
    final static String user="root";
    final static String password="";

    /**
     * 数据库连接工具类 返回一个连接 该方法是获取连接 将url user password 设置为变量 一旦设置为变量 就不可以在修改
     * @return
     */
    public Connection getConnection(){
        Connection con=null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection(url, user, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return con;
    }

    /**
     * 该方法是关闭连接 (三个参数)
     * @param con
     * @param pre
     * @param re
     */
    public void closeConnection(Connection con, PreparedStatement pre,ResultSet re){
            try {
                if (con!=null) {
                    con.close();
                }
                if(pre!=null){
                    pre.close();
                }
                if (re!=null){
                    re.close();
                }
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }

    /**
     * 关闭连接(参数两个)
     * @param con
     * @param pre
     */
    public void closeConnection(Connection con, PreparedStatement pre){
        try {
            if (con!=null) {
                con.close();
            }
            if(pre!=null){
                pre.close();
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
    }
}

MsgDao（消息处理）

package com.edu.dao;

import com.edu.bean.Msg;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

public class MsgDao {
    BaseDao baseDao=new BaseDao();


    public int addMsg(Msg msg){
        int i=0;
        Connection con = baseDao.getConnection();
        PreparedStatement pre=null;
        String sql="INSERT INTO msgs(username,title,msgcontent,state,sendto,msg_create_date)VALUES(?,?,?,0,?,NOW())";
        try {
            pre = con.prepareStatement(sql);
            pre.setString(1,msg.getMsgUsername());
            pre.setString(2,msg.getMsgTitle());
            pre.setString(3,msg.getMsgContent());
            pre.setString(4,msg.getMsgSendto());
            i = pre.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            baseDao.closeConnection(con,pre);
        }
        return i;
    }

    public ArrayList<Msg> getMsg(String uname){
        ArrayList<Msg> list=new ArrayList<>();
        Connection con = baseDao.getConnection();
        String sql="SELECT * from msgs where sendto=?";
        PreparedStatement pre=null;
        ResultSet rs=null;
        try {
            pre = con.prepareStatement(sql);
            pre.setString(1,uname);
             rs = pre.executeQuery();
            while(rs.next()){
                Msg msg=new Msg();
                msg.setMsgId(rs.getInt(1));
                msg.setMsgUsername(rs.getString(2));
                msg.setMsgTitle(rs.getString(3));
                msg.setMsgContent(rs.getString(4));
                msg.setMsgState(rs.getInt(5));
                msg.setMsgSendto(rs.getString(6));
                msg.setMsgCredateDate(rs.getString(7));
                list.add(msg);
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            baseDao.closeConnection(con,pre,rs);
        }
        return list;
    }

    public int delMsg(int m){
        int i=0;
        Connection con = baseDao.getConnection();
        String sql="DELETE FROM msgs WHERE msgid=?";
        PreparedStatement pre=null;
        try {
             pre = con.prepareStatement(sql);
            pre.setInt(1, m);
             i = pre.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            baseDao.closeConnection(con,pre);
        }
        return i;
    }

}

用户登陆注册Dao

package com.edu.dao;

import com.edu.bean.Users;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDao extends BaseDao{
    /**
     * 这是增加用户的方法
     * @param  u 直接传入 一个User 对象
     * @return
     */
    public int addUser(Users u){
        int i=0;
        Connection con = getConnection();
        String sql="INSERT INTO users(username,password,email,name)VALUES(?,?,?,?)";
        PreparedStatement pre=null;
        try {
            pre = con.prepareStatement(sql);
            pre.setString(1,u.getUserName());
            pre.setString(2,u.getPassword());
            pre.setString(4,u.getEmail());
            pre.setString(3,u.getName());
            i=pre.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        } finally {
            closeConnection(con,pre);
        }
        return i;
    }

    /**
     * 判断用户表中是否有该用户
     * @param username 传入 用户名
     * @param userpassword 传入 用户密码
     * @return
     */
    public boolean QueryUser(String username,String userpassword){
        boolean b=false;
        Connection con = getConnection();
        String sql="select * from users where username=? and password=?";
        PreparedStatement pre=null;
        try {
            pre= con.prepareStatement(sql);
            pre.setString(1,username);
            pre.setString(2,userpassword);
            ResultSet re = pre.executeQuery();
            b = re.next();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            closeConnection(con,pre);
        }
        return  b;
    }

}

数据库截图:

User数据库

Msg数据库 

3.具体实现功能界面

3.1-用户登录界面

 3.1--jsp代码

<%@ page import="java.util.Random" %><%--
  Created by IntelliJ IDEA.
  User: 86177
  Date: 2021/3/24
  Time: 21:35
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登陆页面</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
</head>
<style>
    .head {
        height: 120px;
        position: relative;
    }

    .body {
        height: 500px;
        position: relative;
        background: blue;
    }

    .bodyend {
        height: 60px;
    }

    .fenge {
        height: 6px;
        background-color: gray;
    }

    .head-right {
        height: 100px;
        width: 300px;
        position: absolute;
        top: 10px;
        right: 200px;
        text-align: center;
        line-height: 100px;
        font-size: 18px;
    }

    .head-right a {
        text-decoration: none;
        color: grey
    }

    a:hover {
        color: red;
    }

    .body-left {
        position: absolute;
        width: 400px;
        height: 410px;
        background-color: aliceblue;
        top: 50%;
        left: 50%;
        margin-top: -200px;
        margin-left: -205px;
        border-radius: 10px;
    }

    .fenge-left {
        padding-top: 60px;
        text-align: center;
    }

    .fenge-right {
        padding-top: 40px;
        height: 100px;
    }

    .body-left-1 {}
</style>

<body>
<div class="head">
    <img src="img/title2.jpg" style="height: 120px;  400px; margin-left: 200px;" alt="">
    <div class="head-right">
        <a href="index.jsp" style="margin-right: 30px;">首页</a>
        <a href="register.jsp">新用户注册</a>
    </div>
</div>
<div class="body">
    <img src="img/beijing.jpg" alt="" style=" 100%;height: 100%;">
    <form action="queryUserlmp" method="post">
        <div class="body-left">
            <h3 class="text-center"><strong>go-登陆</strong></h3>
            <div class="form-group" style="padding-top: 40px;">
                <label for="inputEmail3" class="col-sm-2 control-label">账号</label>
                <div class="col-sm-10">
                    <input type="text" class="form-control" id="inputEmail3" name="username" placeholder="请输入用户名">
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <label class="col-sm-2 control-label">密码</label>
                <div class="col-sm-10">
                    <input type="password" class="form-control"  name="password" placeholder="请输入密码">
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <div class="col-sm-6">
                    <input type="text" class="form-control" name="verify" placeholder="请输入验证码">
                </div>
                <div class="col-sm-6">
                    <%
                        Random rdm = new Random();
                        int code1 = rdm.nextInt(10)+1;
                        int code2 = rdm.nextInt(30)+1;
                    %>
                    <input type="text" name="code1" value="<%=code1%>" hidden>
                    <input type="text" name="code2" value="<%=code2%>" hidden>
                    计算：<%=code1%>+<%=code2%>的结果
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <div class="col-sm-12">
                    <input type="submit" class="btn btn-info" style=" 350px;">
                </div>
            </div>
            <div class="form-group text-center" style="padding-top: 60px;">
                <a href="register.jsp">还没注册用户?立即注册！</a>
            </div>
        </div>
    </form>
    <div class=" bodyend">
    </div>
    <div class="fenge">
        <div class="fenge-left"><kbd>CopyRight © A星系统管理平台</kbd>
            <img src="img/pic.gif" alt="">
        </div>
        <div class="fenge-right text-center">技术支持：沈阳科技不科技信息科技有限公司（技术支持电话：110）</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
</body>

</html>

3.1---server代码

package com.edu.lmp;

import com.edu.dao.UserDao;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class QueryUserlmp extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        UserDao userDao=new UserDao();
        boolean b = userDao.QueryUser(username, password);
        if (b){
            HttpSession session = req.getSession();
            session.setAttribute("username",username);
            req.getRequestDispatcher("login-success.jsp").forward(req,resp);
            System.out.println("登陆成功");
        }else{
            System.out.println("登陆失败");
        }
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }
}

3.2-用户注册页面

 3.2----jsp代码

<%@ page import="java.util.Random" %><%--
  Created by IntelliJ IDEA.
  User: 86177
  Date: 2021/3/24
  Time: 21:35
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>注册页面</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
</head>
<style>
    .head {
        height: 120px;
        position: relative;
    }

    .body {
        height: 500px;
        position: relative;
        background: blue;
    }

    .bodyend {
        height: 60px;
    }

    .fenge {
        height: 6px;
        background-color: gray;
    }

    .head-right {
        height: 100px;
        width: 300px;
        position: absolute;
        top: 10px;
        right: 200px;
        text-align: center;
        line-height: 100px;
        font-size: 18px;
    }

    .head-right a {
        text-decoration: none;
        color: grey
    }

    a:hover {
        color: red;
    }

    .body-left {
        position: absolute;
        width: 400px;
        height: 410px;
        background-color: aliceblue;
        top: 50%;
        left: 50%;
        margin-top: -200px;
        margin-left: -205px;
        border-radius: 10px;
    }

    .fenge-left {
        padding-top: 60px;
        text-align: center;
    }

    .fenge-right {
        padding-top: 40px;
        height: 100px;
    }
</style>

<body>
<div class="head">
    <img src="img/title2.jpg" style="height: 120px;  400px; margin-left: 200px;" alt="">
    <div class="head-right">
        <a href="index.jsp" style="margin-right: 30px;">首页</a>
        <a href="register.jsp">新用户注册</a>
    </div>
</div>
<div class="body">
    <img src="img/beijingtwo.jpg" alt="内容无法加载" style=" 100%;height: 100%;">
    <form action="addUserlmp" method="post">
        <div class="body-left">
            <h3 class="text-center"><strong>To-注册</strong></h3>
            <div class="form-group" style="padding-top: 40px;">
                <label for="inputEmail3" class="col-sm-2 control-label">账号</label>
                <div class="col-sm-10">
                    <input type="text" class="form-control" id="inputEmail3" name="username" placeholder="请输入用户名">
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <label class="col-sm-2 control-label">密码</label>
                <div class="col-sm-10">
                    <input type="password" class="form-control"  name="password" placeholder="请输入密码">
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <label class="col-sm-2 control-label">昵称</label>
                <div class="col-sm-10">
                    <input type="text" class="form-control"  name="ncname" placeholder="请输入你的昵称">
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <label class="col-sm-2 control-label">邮箱</label>
                <div class="col-sm-10">
                    <input type="email" class="form-control"  name="email" placeholder="请输入你的邮箱">
                </div>
            </div>
            <div class="form-group" style="padding-top: 40px;">
                <div class="col-sm-12">
                    <input type="submit" class="btn btn-info" style=" 350px;">
                </div>
            </div>
            <div class="form-group text-center" style="padding-top: 38px;">
                <a href="login.jsp">已有帐户?立即登陆！</a>
            </div>
        </div>
    </form>
    <div class=" bodyend">
    </div>
    <div class="fenge">
        <div class="fenge-left"><kbd>CopyRight © A星系统管理平台</kbd>
            <img src="img/pic.gif" alt="">
        </div>
        <div class="fenge-right text-center">技术支持：沈阳科技不科技信息科技有限公司（技术支持电话：110）</div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
</body>

</html>

3.2-----server代码

package com.edu.lmp;

import com.edu.bean.Users;
import com.edu.dao.UserDao;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class AddUserlmp extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        String username = req.getParameter("username").trim();
        String password = req.getParameter("password").trim();
        String ncname=new String(req.getParameter("ncname").getBytes("iso-8859-1"), "utf-8").trim();
        String email = req.getParameter("email").trim();
        boolean boo=username.length()>0&&password.length()>0;
        if (boo){
            Users u=new Users(username,password,ncname,email);
            UserDao userDao=new UserDao();
            int i = userDao.addUser(u);
            if(i>0){
                System.out.println("添加成功");
                req.getRequestDispatcher("login.jsp").forward(req,resp);
            }else {
                System.out.println("添加失败");
                req.getRequestDispatcher("register.jsp").forward(req,resp);
            }
        }else {
            resp.getWriter().println("<script>alert("注册失败,用户名或者密码没写!");</script>"); ;
        }
    }
}

3.3---查看邮箱界面

3.3------jsp代码

<%@ page import="java.sql.*" %>
<%@ page import="java.lang.reflect.Field" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="com.edu.dao.MsgDao" %>
<%@ page import="com.edu.bean.Msg" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
    String adminuser= (String) session.getAttribute("username");
    if (adminuser==null){
        response.sendRedirect("login.jsp");
    }
%>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>邮件管理</title>
    <link rel="stylesheet" href="./css/houtai.css">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
    <!-- 加载 Bootstrap 的所有 JavaScript 插件。你也可以根据需要只加载单个插件。 -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
</head>
<style>
    @font-face {
        font-family: 'icomoon';
        src: url('fonts/icomoon.eot?fbn67q');
        src: url('fonts/icomoon.eot?fbn67q#iefix') format('embedded-opentype'),
        url('fonts/icomoon.ttf?fbn67q') format('truetype'),
        url('fonts/icomoon.woff?fbn67q') format('woff'),
        url('fonts/icomoon.svg?fbn67q#icomoon') format('svg');
        font-weight: normal;
        font-style: normal;
        font-display: block;
    }

    /* 为使用icomoon字体声明样式 */
</style>

<body>
<div class="header">
    <div class="one"></div><!-- 使用icommon字体 -->
    <div class="two">A-Xing</div><!-- 公司名称 -->
    <div class="three">
        <nav>
            <p>你好-----<%=adminuser%></p>
        </nav>
        <button type="button" class="btn btn-default" onclick="window.location.href='addmsg.jsp'"
                style="position: absolute; top: 25px; right: 230px; 200px;color: red">写邮件</button>
    </div>
</div>
<hr style="border: 2px solid black">
<div class="body">
    <div class="body-one">
        <h3 style="margin-left: 60px; color: red;">收件箱</h3>
        <table class="table table-bordered table table-hover">
            <tr>
                <th class="text-center">发件人</th>
                <th class="text-center">时间</th>
                <th class="text-center">主题</th>
                <th class="text-center">是否已读</th>
                <th class="text-center">操作</th>
            </tr>
            <jsp:useBean id="Msg" class="com.edu.dao.MsgDao" scope="page"/>
            <%
                MsgDao msgDao= new MsgDao();
                String uname= (String) session.getAttribute("username");
                ArrayList<Msg> list = msgDao.getMsg(uname);
                for (int i=0;i<list.size();i++){
            %>
            <tr>
                <td class="text-center"><%=list.get(i).getMsgUsername()%></td>
                <td class="text-center"><%=list.get(i).getMsgCredateDate()%></td>
                <td class="text-center"><a href="#"><%=list.get(i).getMsgTitle()%></a></td>
                <td class="text-center"><%=list.get(i).getMsgState() == 0 ? "未读" : "已读"%></td>
                <td class="text-center">
                    <button type="button" class="btn btn-primary" onclick="window.location.href='delMsglmp?id=<%=list.get(i).getMsgId()%>'">删除</button>
                    <button type="button" class="btn btn-primary" onclick="window.location.href='replymsg.jsp?uuuname=<%=list.get(i).getMsgSendto()%>'">回复</button>
                </td>
            </tr>
            <%
                }
            %>
        </table>
    </div>
</div>
<div class="footer">
    <!-- 尾部部分，设置一些说明 -->
    <div class="jieweitu1"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu2"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu3"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu4"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu5"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="footer1">版本所有©阿星公司名称保留所有权利。</div><!-- 公司版权 -->
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
</body>

</html>

3.3--------server代码 

只是将server代码写到jsp中 获取数据库中当前邮件的列表

3.4----用户写邮件

 3.4---------JSP代码

<%--
  Created by IntelliJ IDEA.
  User: 86177
  Date: 2021/4/22
  Time: 9:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%--<%--%>
<%--    String adminuser= (String) session.getAttribute("username");--%>
<%--    if (adminuser==null){--%>
<%--        response.sendRedirect("login.jsp");--%>
<%--    }--%>
<%--%>--%>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>我的喜爱</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    /* 用于清楚系统自带的内外边距 */

    @font-face {
        font-family: 'icomoon';
        src: url('fonts/icomoon.eot?fbn67q');
        src: url('fonts/icomoon.eot?fbn67q#iefix') format('embedded-opentype'),
        url('fonts/icomoon.ttf?fbn67q') format('truetype'),
        url('fonts/icomoon.woff?fbn67q') format('woff'),
        url('fonts/icomoon.svg?fbn67q#icomoon') format('svg');
        font-weight: normal;
        font-style: normal;
        font-display: block;
    }

    /* 为使用icomoon字体声明样式 */

    .header {
        height: 80px;
        /* 设置高为80px */
    }

    .one {
        line-height: 80px;
        /* 设置行间距为80px,通常与本身高度一样,这样可以居中 */
        left: 20px;
        position: absolute;
        /* 使用绝对定位，前提必须有相对定位 */
        font-family: "icomoon";
        /* 设置字体样式为icommon */
        font-size: 40px;
        /* 字体大小为40px */
        color: #00BFFF;
        /* 颜色使用二进制表示 */
    }

    .two {
        line-height: 80px;
        /* 设置行高为80px */
        left: 60px;
        /* 绝对定位左偏移 */
        position: absolute;
        /* 使用绝对定位 */
        font-size: 40px;
        /* 字体大小为40px */
        color: #000000;
        /* 颜色为黑色 */
    }

    .three {
        position: absolute;
        left: 350px;
        width: 850px;
        height: 80px;
    }

    .four {
        height: 80px;
        width: 200px;
        position: absolute;
        right: 0;
    }

    .four a {
        text-decoration: none;
        /* 取消a连接下划线 */
        font-size: 35px;
        color: black;
        font-family: 'icomoon';
        line-height: 80px;
        margin-left: 20px;
        /* 左边距20px */
    }

    .four a:hover {
        color: #00BFFF;
        /* 当a链接被点击时颜色变为蓝色 */
    }

    .three nav a {
        text-decoration: none;
        /* 取消a连接下划线 */
        font-size: 20px;
        line-height: 80px;
        margin-left: 80px;
        color: #000000;
    }

    .three nav a:hover {
        color: #00BFFF;
    }

    .body {
        height: 400px;
        position: relative;
        /* 使用相对定位 */
    }

    .body-one p {
        position: absolute;
        top: 41%;
        left: 50%;
        margin-left: -88px;
    }

    .body-one .body-two {
        position: absolute;
        top: 50%;
        left: 50%;
        margin-left: -100px;
        width: 200px;
        height: 50px;
        border: 1px solid black;
        /* 设置边框 为1px 实线 黑色 */
        line-height: 50px;
        text-align: center;
    }

    .footer {
        position: relative;
    }

    .jieweitu1 {
        position: absolute;
        top: 42px;
        left: 24px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        /* 用于设置透明度 使用rgba方式 */
        border-radius: 50%;
        /* 通常是用这个属性将边框变为圆角 */
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        /* 设置字体对齐方式为居中 */
        color: #ffffff;
        /* 字体为白色 */
    }

    .jieweitu2 {
        position: absolute;
        top: 42px;
        left: 72px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu3 {
        position: absolute;
        top: 42px;
        left: 121px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu4 {
        position: absolute;
        top: 42px;
        left: 168px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu5 {
        position: absolute;
        top: 42px;
        left: 214px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu1:hover {
        background-color: pink;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu2:hover {
        background-color: #00ff00;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu3:hover {
        background-color: #6d9eeb;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu4:hover {
        background-color: #ffff00;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu5:hover {
        background-color: #674ea7;
        /* 当点击时变色 用:hover属性 */
    }

    .footer {
        background-color: black;
        height: 237px;
        opacity: 0.9;
        /* 设置透明度 */
    }

    .footer1 {
        /* 设置尾部属性 */
        position: absolute;
        color: #A9A9A9;
        font-size: 15px;
        left: 616px;
        top: 50px;
    }

    .footer2 {
        position: absolute;
        width: 100px;
        height: 100px;
        left: 693px;
        top: 100px;
    }

    .footer3 {
        width: 500px;
        height: 100px;
        position: absolute;
        right: 0;
    }

    .footer3 a {
        text-decoration: none;
        color: #ffffff;
        line-height: 100px;
        font-size: 18px;
        margin-right: 80px;
    }

    .footer3 a:hover {
        color: #00BFFF;
    }

    .fanhuishouye {
        text-decoration: none;
        color: #000000;
    }

    .youjian {
        font-size: 30px;
        color: red;
        line-height: 80px;
    }
</style>

<body>
<div class="header">
    <!-- 导航栏盒子 -->
    <div class="one"></div><!-- 使用icommon字体 -->
    <div class="two">A-Xing</div><!-- 公司名称 -->
    <div class="three">
        <!-- 列表盒子 -->
    </div>
    <div class="four">
        <div class="youjian">编写邮件界面</div>
    </div>
</div>
<hr>
<div class="body">
    <div class="body-one">
        <form action="addMsglmp" method="post">
            <label for="exampleInputName2">当前发送人为:<%=session.getAttribute("username")%></label>
            <div class="form-group">
                <label for="exampleInputName2">收件人:</label>
                <input type="text" class="form-control" id="exampleInputName2" placeholder="请输入要发送的人" name="js">
            </div>
            <div class="form-group">
                <label for="exampleInputEmail2">主题:</label>
                <input type="text" class="form-control" id="exampleInputEmail2" placeholder="主题" name="title">
            </div>
            <label for="exampleInputEmail2">内容:</label>
            <textarea class="form-control" rows="3" name="msgcontent">
            </textarea>
            <button type="submit" class="btn btn-default">发送</button>
        </form>
    </div>
</div>
<hr>
<div class="footer">
    <!-- 尾部部分，设置一些说明 -->
    <div class="jieweitu1"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu2"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu3"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu4"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu5"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="footer1"></div><!-- 公司版权 -->
    <div class="footer2">
        <img src="./img/log.jpg" alt="" style=" 100%;" height="100%;"> <!-- 公司logo -->
    </div>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
</body>

</html>

3.4------------------server

package com.edu.lmp;

import com.edu.bean.Msg;
import com.edu.dao.MsgDao;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class AddMsglmp extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        HttpSession session = req.getSession();
        String fs= (String) session.getAttribute("username");
        String js=new String(req.getParameter("js").getBytes("iso-8859-1"), "utf-8").trim();
        String title=new String(req.getParameter("title").getBytes("iso-8859-1"), "utf-8").trim();
        String msgcontent=new String(req.getParameter("msgcontent").getBytes("iso-8859-1"), "utf-8").trim();
        SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd HH:mm");
        String date = df.format(new Date());
        boolean boo=fs.length()>0&&title.length()>0&&msgcontent.length()>0&&date.length()>0;
        if (boo){
            Msg m=new Msg();
            m.setMsgTitle(title);
            m.setMsgUsername(fs);
            m.setMsgContent(msgcontent);
            m.setMsgSendto(js);
            m.setMsgCredateDate(date);
            MsgDao msgDao=new MsgDao();
            int i = msgDao.addMsg(m);
            System.out.println(i);
        }else{
            resp.getWriter().println("<script>alert("写邮件失败,其中某一项没有填写!");</script>"); ;
        }


    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doPost(req, resp);
    }
}

 3.5---------用户看邮件详细

 当我们第一次收到邮件的时候，会显示未读，当我们点击主题链接，会进入邮件里面

 会看到邮件里面的详细内容-------当我们返回首页

会变成已读

我们可以在邮件列表里面 回复 或者在 邮件详细里面回复

3.5---JSP代码

<%@ page import="com.edu.bean.Msg" %>
<%@ page import="com.edu.dao.MsgDao" %><%--
  Created by IntelliJ IDEA.
  User: 86177
  Date: 2021/4/22
  Time: 9:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%--<%--%>
<%--    String adminuser= (String) session.getAttribute("username");--%>
<%--    if (adminuser==null){--%>
<%--        response.sendRedirect("login.jsp");--%>
<%--    }--%>
<%--%>--%>
<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>我的喜爱</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/jquery@1.12.4/dist/jquery.min.js"></script>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    /* 用于清楚系统自带的内外边距 */

    @font-face {
        font-family: 'icomoon';
        src: url('fonts/icomoon.eot?fbn67q');
        src: url('fonts/icomoon.eot?fbn67q#iefix') format('embedded-opentype'),
        url('fonts/icomoon.ttf?fbn67q') format('truetype'),
        url('fonts/icomoon.woff?fbn67q') format('woff'),
        url('fonts/icomoon.svg?fbn67q#icomoon') format('svg');
        font-weight: normal;
        font-style: normal;
        font-display: block;
    }

    /* 为使用icomoon字体声明样式 */

    .header {
        height: 80px;
        /* 设置高为80px */
    }

    .one {
        line-height: 80px;
        /* 设置行间距为80px,通常与本身高度一样,这样可以居中 */
        left: 20px;
        position: absolute;
        /* 使用绝对定位，前提必须有相对定位 */
        font-family: "icomoon";
        /* 设置字体样式为icommon */
        font-size: 40px;
        /* 字体大小为40px */
        color: #00BFFF;
        /* 颜色使用二进制表示 */
    }

    .two {
        line-height: 80px;
        /* 设置行高为80px */
        left: 60px;
        /* 绝对定位左偏移 */
        position: absolute;
        /* 使用绝对定位 */
        font-size: 40px;
        /* 字体大小为40px */
        color: #000000;
        /* 颜色为黑色 */
    }

    .three {
        position: absolute;
        left: 350px;
        width: 850px;
        height: 80px;
    }

    .four {
        height: 80px;
        width: 200px;
        position: absolute;
        right: 0;
    }

    .four a {
        text-decoration: none;
        /* 取消a连接下划线 */
        font-size: 35px;
        color: black;
        font-family: 'icomoon';
        line-height: 80px;
        margin-left: 20px;
        /* 左边距20px */
    }

    .four a:hover {
        color: #00BFFF;
        /* 当a链接被点击时颜色变为蓝色 */
    }

    .three nav a {
        text-decoration: none;
        /* 取消a连接下划线 */
        font-size: 20px;
        line-height: 80px;
        margin-left: 80px;
        color: #000000;
    }

    .three nav a:hover {
        color: #00BFFF;
    }

    .body {
        height: 400px;
        position: relative;
        /* 使用相对定位 */
        text-align: center;
        font-size: 20px;
    }

    .body-one p {
        position: absolute;
        top: 41%;
        left: 50%;
        margin-left: -88px;
    }

    .body-one .body-two {
        position: absolute;
        top: 50%;
        left: 50%;
        margin-left: -100px;
        width: 200px;
        height: 50px;
        border: 1px solid black;
        /* 设置边框 为1px 实线 黑色 */
        line-height: 50px;
        text-align: center;
    }

    .footer {
        position: relative;
    }

    .jieweitu1 {
        position: absolute;
        top: 42px;
        left: 24px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        /* 用于设置透明度 使用rgba方式 */
        border-radius: 50%;
        /* 通常是用这个属性将边框变为圆角 */
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        /* 设置字体对齐方式为居中 */
        color: #ffffff;
        /* 字体为白色 */
    }

    .jieweitu2 {
        position: absolute;
        top: 42px;
        left: 72px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu3 {
        position: absolute;
        top: 42px;
        left: 121px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu4 {
        position: absolute;
        top: 42px;
        left: 168px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu5 {
        position: absolute;
        top: 42px;
        left: 214px;
        width: 30px;
        height: 30px;
        background-color: rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        font-family: 'icomoon';
        line-height: 30px;
        text-align: center;
        color: #ffffff;
    }

    .jieweitu1:hover {
        background-color: pink;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu2:hover {
        background-color: #00ff00;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu3:hover {
        background-color: #6d9eeb;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu4:hover {
        background-color: #ffff00;
        /* 当点击时变色 用:hover属性 */
    }

    .jieweitu5:hover {
        background-color: #674ea7;
        /* 当点击时变色 用:hover属性 */
    }

    .footer {
        background-color: black;
        height: 237px;
        opacity: 0.9;
        /* 设置透明度 */
    }

    .footer1 {
        /* 设置尾部属性 */
        position: absolute;
        color: #A9A9A9;
        font-size: 15px;
        left: 616px;
        top: 50px;
    }

    .footer2 {
        position: absolute;
        width: 100px;
        height: 100px;
        left: 693px;
        top: 100px;
    }

    .footer3 {
        width: 500px;
        height: 100px;
        position: absolute;
        right: 0;
    }

    .footer3 a {
        text-decoration: none;
        color: #ffffff;
        line-height: 100px;
        font-size: 18px;
        margin-right: 80px;
    }

    .footer3 a:hover {
        color: #00BFFF;
    }

    .fanhuishouye {
        text-decoration: none;
        color: #000000;
    }

    .youjian {
        font-size: 30px;
        color: red;
        line-height: 80px;
    }
</style>

<body>
<div class="header">
    <!-- 导航栏盒子 -->
    <div class="one"></div><!-- 使用icommon字体 -->
    <div class="two">A-Xing</div><!-- 公司名称 -->
    <div class="three">
        <!-- 列表盒子 -->
    </div>
    <div class="four">
        <div class="youjian">编写邮件界面</div>
    </div>
</div>
<hr>
<%
    MsgDao msgDao=new MsgDao();
    int mid= Integer.parseInt(request.getParameter("mid"));
    Msg m =msgDao.DetailMsg(mid);
    msgDao.Upmsgstate(mid);
%>
<div class="body jumbotron">
    <span class="label label-primary">发件人:<%=m.getMsgUsername()%></span><br>
    <span class="label label-success">发送时间:<%=m.getMsgCredateDate()%></span><br>
    <span class="label label-warning">主题:<%=m.getMsgTitle()%></span><br>
    <span class="label label-info">内容:<%=m.getMsgContent()%></span><br>
    <ol class="breadcrumb" style="font-size: 16px;margin-top: 50px">
        <li><a href="replymsg.jsp?mid=<%=m.getMsgId()%>">回复</a></li>
        <li><a href="login-success.jsp">返回首页</a></li>
    </ol>
</div>
<hr>
<div class="footer">
    <!-- 尾部部分，设置一些说明 -->
    <div class="jieweitu1"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu2"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu3"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu4"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="jieweitu5"></div><!-- 一些花里胡哨的操作，碰到这个会变色 -->
    <div class="footer1"></div><!-- 公司版权 -->
    <div class="footer2">
        <img src="./img/log.jpg" alt="" style=" 100%;" height="100%;"> <!-- 公司logo -->
    </div>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/js/bootstrap.min.js"></script>
</body>

</html>

3.5-------servlet代码

public Msg DetailMsg(int id){
        Msg m=new Msg();
        Connection con= baseDao.getConnection();
        PreparedStatement pre=null;
        ResultSet rs=null;
        String sql="SELECT * FROM msgs WHERE msgid=?";
        try {
             pre = con.prepareStatement(sql);
             pre.setInt(1,id);
             rs = pre.executeQuery();
            while(rs.next()) {
                m.setMsgId(rs.getInt(1));
                m.setMsgUsername(rs.getString(2));
                m.setMsgTitle(rs.getString(3));
                m.setMsgContent(rs.getString(4));
                m.setMsgState(rs.getInt(5));
                m.setMsgSendto(rs.getString(6));
                m.setMsgCredateDate(rs.getString(7));
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        } finally {
            baseDao.closeConnection(con,pre,rs);
        }
        return m;
    }

然后我们通过当用户点击邮件详细的时候，将state状态改变

public void Upmsgstate(int id){
        Connection con = baseDao.getConnection();
        String sql="UPDATE msgs SET state=1 WHERE msgid=?";
        PreparedStatement pre=null;
        try {
            pre = con.prepareStatement(sql);
            pre.setInt(1,id);
            pre.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            baseDao.closeConnection(con,pre);
        }
    }

3.5-------servlet层

protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf-8");
        HttpSession session = req.getSession();
        String adminuser= (String) session.getAttribute("username");
        String uuuname= (String) session.getAttribute("uuuname");
        String title=new String(req.getParameter("title").getBytes("iso-8859-1"), "utf-8").trim();
        String zw=new String(req.getParameter("zw").getBytes("iso-8859-1"), "utf-8").trim();
        boolean boo=title.length()>0&&zw.length()>0;
        if (boo){
            MsgDao msgDao=new MsgDao();
            Msg m=new Msg();
            m.setMsgTitle(title);
            m.setMsgContent(zw);
            m.setMsgSendto(uuuname);
            m.setMsgUsername(adminuser);
            int i = msgDao.addMsg(m);
            System.out.println(i);
        }
    }

3.6---------------------------用户回复邮件

 3.6------------JSP代码

<%@ page import="com.edu.dao.MsgDao" %>
<%@ page import="com.edu.bean.Msg" %><%--
  Created by IntelliJ IDEA.
  User: 86177
  Date: 2021/4/22
  Time: 11:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<%
    String adminuser= (String) session.getAttribute("username");
    MsgDao msgDao=new MsgDao();
    int mid= Integer.parseInt(request.getParameter("mid"));
    Msg m =msgDao.DetailMsg(mid);
    if (adminuser==null){
        response.sendRedirect("login.jsp");
    }
    session.setAttribute("uuuname",m.getMsgUsername());
%>
<head>
    <title>回复邮件</title>
</head>

<body>
<form action="replyMsglmp" method="post">
    <label for="zt">主题:</label>
    <input type="text" placeholder="请输入主题" id="zt" name="title">
    <br>
    <label for="zw">正文:</label>
    <br>
    <textarea id="zw" rows="10" cols="50" name="zw">
    </textarea>
    <button type="submit">回复</button>

    <p>当前发送者为:<%=adminuser%></p>
    <%
        HttpSession session1=request.getSession();
    %>
     <p>当前接收者为:<%=m.getMsgUsername()%></p>
</form>
</body>

</html>

3.6-------------------------java代码

public int addMsg(Msg msg){
        int i=0;
        Connection con = baseDao.getConnection();
        PreparedStatement pre=null;
        String sql="INSERT INTO msgs(username,title,msgcontent,state,sendto,msg_create_date)VALUES(?,?,?,0,?,NOW())";
        try {
            pre = con.prepareStatement(sql);
            pre.setString(1,msg.getMsgUsername());
            pre.setString(2,msg.getMsgTitle());
            pre.setString(3,msg.getMsgContent());
            pre.setString(4,msg.getMsgSendto());
            i = pre.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            baseDao.closeConnection(con,pre);
        }
        return i;
    }

当我们回复 今天我们不打球了 受伤了 

 我们已经发送成功 用xiaohui账户看看是否成功

 3.7-----------用户删除邮件

3.7----------------------------------用户删除邮件JSP代码

<button type="button" class="btn btn-primary" onclick="window.location.href='delMsglmp?id=<%=list.get(i).getMsgId()%>'">删除</button>

3.7-------------------------------dao层

 public int delMsg(int m){
        int i=0;
        Connection con = baseDao.getConnection();
        String sql="DELETE FROM msgs WHERE msgid=?";
        PreparedStatement pre=null;
        try {
             pre = con.prepareStatement(sql);
            pre.setInt(1, m);
             i = pre.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            baseDao.closeConnection(con,pre);
        }
        return i;
    }

 这时候 我们就将刚才发的邮件 已经删除了