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JSP+JAVABEAN+SERVLET模式的注册实例实现

MVC模式即Model-View-Controller模式。

Servlet用来处理请求的事务，充当控制器（Controller即C）的角色，Servlet负责响应用户对业务逻辑的请求并根据用户的请求行为，决定将哪个JSP页面发送给客户。

JSP页面处于表现层，也就是视力（View即V）的角色。

JavaBean则负责数据的处理，也就是模型（Model即M）的角色。

初始的请求由Servlet来处理，Servlet调用商业逻辑和数据处理代码，并创建Bean来表示相应的结果（模型）。然后Servlet确定哪个页面适合于表达这些特定的结果，并将请求转发到相应的页面（JSP页面即为视图），由Servlet确定哪个业务逻辑适用，应该用哪个JSP页面相应结果（Servlet就是控制器）。

注册实例：

配置文件配置SERVLET的调用

/PetStore/WebRoot/WEB-INF/web.xml

代码

    <servlet>
    <servlet-name>reg</servlet-name>
    <servlet-class>cn.wy.CtrlServlet.reg</servlet-class>
    </servlet>
    <servlet-mapping>
    <servlet-name>reg</servlet-name>
    <url-pattern>/reg</url-pattern>
    </servlet-mapping>

前端jsp页面

/PetStore/WebRoot/register.jsp

代码

<%@ page contentType="text/html; charset=gb2312" language="java" import="cn.wy.Pet.User" errorPage="" %>
<jsp:useBean id="user" scope="page" class="cn.wy.Pet.User"/>
<% 
//权限默认不是超级管理员
boolean isAdmin = false ;
String actionStr = "";
if (session.getAttribute("user") != null)
    {
        user = (User)session.getAttribute("user");
        //取出权限
        if (user.getUPopedom() ==0)
            isAdmin = true ;
    }
    String qFile = request.getRequestURI();
    System.out.println(qFile);
    //说明是超级管理员，并在后台添加用户
    if ("/admin/default.jsp".equals(qFile))
    {
        actionStr = "../" ;
    }
    
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>宠物商店会员注册</title>
<style type="text/css">
<!--
.STYLE1 {
    color: #FF0000;
    font-weight: bold;
}
.STYLE2 {color: #FF0000}
.STYLE3 {
    font-size: 18px;
    font-weight: bold;
}
-->
</style>
</head>

<body style="font-size:12px">
<form id="form1" name="form1" method="post" action="<%=actionStr%>reg">
  <p align="center"><br />
    <span class="STYLE3">用户注册</span></p>
  <table width="582" height="302" border="1" align="center" cellpadding="0" cellspacing="0" bordercolor="#BCACD2">
    <tr>
      <td width="80" align="right">用户名：</td>
      <td width="496" align="left"><input name="userName" type="text" id="userName" size="16" maxlength="16" />
      <span class="STYLE1">*</span> 3~16位字母或者数字（如：8hack）</td>
    </tr>
    <tr>
      <td align="right">密码：</td>
      <td align="left"><input name="password1" type="text" id="password1" size="16" maxlength="16" />
      <span class="STYLE1">*  </span> 3~16位字母或者数字（如：abc123）</td>
    </tr>
    <tr>
      <td align="right">确认密码：</td>
      <td align="left"><input name="password2" type="text" id="password2" size="16" maxlength="16" />
      <span class="STYLE1">*</span> 必须和上面输入的密码相同</td>
    </tr>
    <tr>
      <td align="right">电子邮件：</td>
      <td align="left"><input name="email" type="text" id="email" maxlength="20" />
      <span class="STYLE1">*</span> 找回密码和联系用（如：8hack@163.com）</td>
    </tr>
    <tr>
      <td align="right">联系电话：</td>
      <td align="left"><input name="tel" type="text" id="tel" size="20" maxlength="20" />
      如（0871-8888888，13888853113）</td>
    </tr>
    <tr>
      <td align="right">联系地址：</td>
      <td align="left"><input name="address" type="text" id="address" maxlength="50" /></td>
    </tr>
        <%
        if (isAdmin)//如果是管理员就显示出下拉列表
        {
        %>
    <tr>
      <td height="26" align="right">权限：</td>
      <td align="left">
        <select name="popedom" id="popedom">
            <option value="0">超级管理员</option>        
            <option value="1">会员</option>
        </select>
    </td>
    </tr>
        <%
        }else//否则就插入一个蕴藏域
        {
        %>
        <input type="hidden" name="popedom" value="1">
        <%
        }
        %>

    <tr>
      <td height="42" align="right">&nbsp;</td>
      <td align="left"><span class="STYLE2">为了方便联系和管理请认真填写你的信息，带星号的必须填写</span></td>
    </tr>
    <tr>
      <td height="40" colspan="2" align="center"><input type="submit" name="Submit" value="确认注册" />
      &nbsp;&nbsp;&nbsp;&nbsp;
      <input type="reset" name="Submit2" value="重新填写" /></td>
    </tr>
  </table>
</form>
</body>
</html>

servlet类

/PetStore/src/cn/wy/CtrlServlet/reg.java

代码



package cn.wy.CtrlServlet;

import cn.wy.DBConnection;
import java.io.*;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;

// Referenced classes of package cn.wy.CtrlServlet:
//            login

public class reg extends HttpServlet
{

    public reg()
    {
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        PrintWriter out;
        DBConnection dbc=null;
        String userName;
        String psd;
        String email;
        String tel;
        String address;
        int popedom;
        response.setContentType("text/html;charset=UTF-8");
        out = response.getWriter();
        try{
        dbc = new DBConnection();
        PreparedStatement ps = null;
        userName = request.getParameter("userName");
        psd = login.encrypt(request.getParameter("password1").toString());
        email = request.getParameter("email");
        tel = request.getParameter("tel");
        address = request.getParameter("address");
        popedom = Integer.parseInt(request.getParameter("popedom"));
        if (userName != null && psd != null && email != null)
        {
        ps = dbc.getCon().prepareStatement("insert into [User](UName,Upass,UEmail,UTel,UAddress,UPopedom) values(?,?,?,?,?,?)");
        ps.setString(1, userName);
        ps.setString(2, psd);
        ps.setString(3, email);
        ps.setString(4, tel);
        ps.setString(5, address);
        ps.setInt(6, popedom);
        ps.execute();
        System.out.print("新用户注册：" + request.getParameter("userName") + "  ");
        out.print("<script>alert('恭喜您：注册成功！现已经登录到网站！');history.go(-1)</script>");
        }
        if (dbc != null)
            dbc.dbClose();
        }
        catch(SQLException ex)
        {
        out.print("<script>alert('注册失败！数据库连接错误！');history.go(-1)</script>");
        ex.printStackTrace();
        if (dbc != null)
            dbc.dbClose();
        }
        
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        processRequest(request, response);
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        processRequest(request, response);
    }

    public String getServletInfo()
    {
        return "Short description";
    }
}

数据库连接类

/PetStore/src/cn/wy/DBConnection.java

代码



package cn.wy;

import java.io.PrintStream;
import java.sql.Connection;
import java.sql.DriverManager;

public class DBConnection
{

    private String mySqlDriver;
    private String mySqlUrl;
    private String mdbDrStr;
    private String mdbUrl;
    long time;
    private String SQLDRIVER;
    private String SQLURL;
    public Connection conn;
    boolean Conectde;

    public DBConnection()
    {
        mySqlDriver = "org.gjt.mm.mysql.Driver";
        mySqlUrl = "jdbc:mysql://localhost/petstore?user=root&password=5455&useUnicode=true&characterEncoding=8859_1";
        mdbDrStr = "sun.jdbc.odbc.JdbcOdbcDriver";
        mdbUrl = "jdbc:odbc:pet";
        SQLDRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
        SQLURL = "jdbc:sqlserver://127.0.0.1:1433;DatabaseName=PetStore";
        conn = null;
        Conectde = false;
        time = System.currentTimeMillis();
        try
        {
            Class.forName(SQLDRIVER).newInstance();
            if (conn == null)
            {
                conn = DriverManager.getConnection(SQLURL, "sa", "123456");
                Conectde = true;
                System.out.print("<");
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    public Connection getCon()
    {
        return conn;
    }

    public void dbClose()
    {
        try
        {
            if (Conectde)
            {
                conn.close();
                Conectde = false;
                System.out.print(System.currentTimeMillis() - time);
                System.out.print(">  ");
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}

JavaBean类

/PetStore/src/cn/wy/Pet/User.java

代码


package cn.wy.Pet;


public class User
{

    private int userID;
    private String UName;
    private String UPass;
    private String UEmail;
    private String UTel;
    private String UAddress;
    private String URegDate;
    private String ALastTime;
    private int UPopedom;
    private int UAppearCount;
    private int URestoreCount;
    private boolean login;

    public User()
    {
        login = false;
    }

    public boolean isLogin()
    {
        return login;
    }

    public void setLogin(boolean isLogin)
    {
        login = isLogin;
    }

    public void setURestoreCount(int URestoreCount)
    {
        this.URestoreCount = URestoreCount;
    }

    public int getURestoreCount()
    {
        return URestoreCount;
    }

    public void setUAppearCount(int UAppearCount)
    {
        this.UAppearCount = UAppearCount;
    }

    public int getUAppearCount()
    {
        return UAppearCount;
    }

    public void setUserID(int userID)
    {
        this.userID = userID;
    }

    public void setUPopedom(int UPopedom)
    {
        this.UPopedom = UPopedom;
    }

    public void setALastTime(String ALastTime)
    {
        this.ALastTime = ALastTime;
    }

    public void setURegDate(String URegDate)
    {
        this.URegDate = URegDate;
    }

    public void setUAddress(String UAddress)
    {
        this.UAddress = UAddress;
    }

    public void setUTel(String UTel)
    {
        this.UTel = UTel;
    }

    public void setUEmail(String UEmail)
    {
        this.UEmail = UEmail;
    }

    public void setUPass(String UPass)
    {
        this.UPass = UPass;
    }

    public void setUName(String UName)
    {
        this.UName = UName;
    }

    public int getUserID()
    {
        return userID;
    }

    public int getUPopedom()
    {
        return UPopedom;
    }

    public String getALastTime()
    {
        return ALastTime;
    }

    public String getURegDate()
    {
        return URegDate;
    }

    public String getUAddress()
    {
        return UAddress;
    }

    public String getUTel()
    {
        return UTel;
    }

    public String getUEmail()
    {
        return UEmail;
    }

    public String getUPass()
    {
        return UPass;
    }

    public String getUName()
    {
        return UName;
    }
}

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原文地址：https://www.cnblogs.com/linzheng/p/1930813.html