课程00作业

网站系统开发需要掌握的技术：

Java语言：JSP、Servlet、JDBC、JavaBean等

面向对象分析设计思想：UML统一建模语言的UML图

设计模式和框架结构

XML、html、css语言

网页脚本语言：JavaScript

数据库

应用服务器

集成开发环境（IDE）

 

本次课堂测试：

界面要求：绘制一个登陆界面：包括两个标签控件、两个文本框和一个登陆按钮；（完成界面绘制功能1分）；
功能要求：
1、数据库要求：要求在数据库中建立用户表，表中包括用户名和密码（1分），实现数据库连接功能（1 分）；
2、输入正确的用户名和密码，点击登录按钮，提示登录成功（0.5分）。输入错误的用户名或者密码，登录会失败，并提示错误信息（0.5分）
3什么都不输入，点击登陆按钮，提示“请输入用户名”信息（0.5分）
4、输入密码时加密显示（以星号“*”显示个数信息）。（0.5分）

源代码：

构造声明

ackage com.Student.msg.model;

public class User {
    private int id;
    private String username;
    private String nickname;
    private String password;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getNickname() {
        return nickname;
    }
    public void setNickname(String nickname) {
        this.nickname = nickname;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
}

接口

package com.Student.msg.dao;

import java.util.List;
import com.Student.msg.model.User;
public interface IUserDao {
    public void add(User user);
    public void delete(int id);
    public void update(User user);
    public User Login(String username);
    public User load(int id);
    public User load(String username);
    public List<User> load();
}

数据库连接

package com.Student.msg.Util;

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

public class DBUtil {
    public static Connection getConnection() {
        // 加载驱动
        try {
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            
        } catch ( ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        String user="数据库名字";
        String password="密码";
        String url="jdbc:sqlserver://localhost:1433; DatabaseName=Student";
        Connection connection =null;
        
        // 创建链接对象
        try {
            connection=DriverManager.getConnection(url, user, password);
            
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return connection;
        
    }
    //关闭资源
    public static void close(PreparedStatement preparedStatement) {
        
             try {
                 if( preparedStatement !=null) {
                preparedStatement.close();
                 }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }
    
    public static void close(ResultSet resultSet)  {
        
            try {
                if(resultSet!= null) {
                resultSet.close();
            }
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }
    
    public static void close(Connection connection) {
        // TODO Auto-generated method stub
        
            try {
                if(connection!=null) {
                connection.close();
                }
                } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

接口连接类

package com.Student.msg.dao;

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

import com.Student.msg.Util.DBUtil;
import com.Student.msg.Util.UserException;
import com.Student.msg.model.User;

public class UserDaoImpl implements IUserDao{

    @SuppressWarnings("resource")
    public User Login(String username) {
        // TODO Auto-generated method stub
        Connection connection=DBUtil.getConnection();
        //准备Sql
        String sql = "select * from Studen where username =?";
        //创建语句传输对象
        
        PreparedStatement preparedStatement=null;
        ResultSet resultSet =null;
        User user =null;
        try {
        preparedStatement =connection.prepareStatement(sql);
        preparedStatement.setString(1, username);
        resultSet =preparedStatement.executeQuery();
        while(resultSet.next()) {
            user =new User();
            user.setUsername(username);
            user.setId(resultSet.getInt("id"));
            user.setPassword(resultSet.getString("password"));
            user.setNickname(resultSet.getString("nickname"));
            //users.add(user);
        }
        }catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        return user;
    }
                
    
    @SuppressWarnings("resource")
    @Override
    public void add(User user) {
        // TODO Auto-generated method stub
        //获得连接对象
        Connection connection=DBUtil.getConnection();
        //准备sql语句
        String sql="select * from Studen where username = ? ";
        //创建语句传输对象
        PreparedStatement preparedStatement= null;
        ResultSet resultSet =null;
        try {
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getUsername());    
        //接收结果集
            resultSet =preparedStatement.executeQuery();
        
            //遍历结果集
            while(resultSet.next()) {
                if(resultSet.getInt(1)>0) {
                    throw new UserException("用户存在 ");
                }
        }    
            
            sql ="insert into Studen(username,password,nickname) values(?,?,?)";
            preparedStatement =connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getUsername());
            preparedStatement.setString(2, user.getPassword());
            preparedStatement.setString(3, user.getNickname());
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);

        }
        
        
    }

    @Override
    public void delete(int id) {
        // TODO Auto-generated method stub
        Connection connection =DBUtil.getConnection();
        String sql ="delete  from Studen where id= ?";
        PreparedStatement preparedStatement=null;
        try {
            preparedStatement=connection.prepareStatement(sql);
            preparedStatement.setInt(1, id);
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally {
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
    }

    @Override
    public void update(User user) {
        // TODO Auto-generated method stub
        Connection connection=DBUtil.getConnection();
        //准备sql
        String sql="update * Studen set password =? ,nickname =? where id=?";
        //创建语句传输对象
        PreparedStatement preparedStatement= null;
        try {
            preparedStatement =connection.prepareStatement(sql);
            preparedStatement.setString(1, user.getPassword());
            preparedStatement.setString(2, user.getNickname());
            preparedStatement.setInt(3, user.getId());
            preparedStatement.executeUpdate();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
    }

    @Override
    public User load(int id) {
        // TODO Auto-generated method stub
        Connection connection =DBUtil.getConnection();
        String sql ="selsct * from Studen where id= ?";
        PreparedStatement preparedStatement=null;
        ResultSet resultSet =null;
        User user =null;
        try {
            preparedStatement =connection.prepareStatement(sql);
            preparedStatement.setInt(1, id);
            resultSet=preparedStatement.executeQuery();
            while(resultSet.next()) {
                user =new User();
                user.setId(id);
                user.setUsername(resultSet.getString("username"));
                user.setPassword(resultSet.getString("password"));
                user.setNickname(resultSet.getString("nickname"));
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        return user;
    }

    @Override
    public User load(String username) {
        // TODO Auto-generated method stub
        Connection connection =DBUtil.getConnection();
        String sql ="select * from Studen where username = ?";
        PreparedStatement preparedStatement=null;
        ResultSet resultSet =null;
        User user =null;
        try {
            preparedStatement =connection.prepareStatement(sql);
            preparedStatement.setString(1, username);
            resultSet=preparedStatement.executeQuery();
            while(resultSet.next()) {
                user =new User();
                user.setUsername(username);
                user.setId(resultSet.getInt("id"));
                user.setPassword(resultSet.getString("password"));
                user.setNickname(resultSet.getString("nickname"));
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        return user;
    }

    @Override
    public List<User> load() {
        // TODO Auto-generated method stub
        Connection connection=DBUtil.getConnection();
        //准备Sql
        String sql = "select * from Studen";
        //创建语句传输对象
        PreparedStatement preparedStatement=null;
        ResultSet resultSet =null;
        //集合中智能放入User对象
        List<User> users=new ArrayList<User>();
        User user =null;
        try {
        preparedStatement =connection.prepareStatement(sql);
        resultSet =preparedStatement.executeQuery();
        while(resultSet.next()) {
            user =new User();
            user.setUsername(resultSet.getString("username"));
            user.setId(resultSet.getInt("id"));
            user.setPassword(resultSet.getString("password"));
            user.setNickname(resultSet.getString("nickname"));
            users.add(user);
        }
        }catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally {
            DBUtil.close(resultSet);
            DBUtil.close(preparedStatement);
            DBUtil.close(connection);
        }
        return users;
    }

}

异常处理类

package com.Student.msg.Util;

public class UserException extends RuntimeException {
    public UserException() {
        super();
        // TODO Auto-generated constructor stub
    }

    public UserException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
        // TODO Auto-generated constructor stub
    }

    public UserException(String message, Throwable cause) {
        super(message, cause);
        // TODO Auto-generated constructor stub
    }

    public UserException(String message) {
        super(message);
        // TODO Auto-generated constructor stub
    }

    public UserException(Throwable cause) {
        super(cause);
        // TODO Auto-generated constructor stub
    }

}

jsp登录界面

<%@page import="com.Student.msg.Util.UserException"%>
<%@page import="com.Student.msg.dao.UserDaoImpl"%>
<%@page import="com.Student.msg.model.User"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<%
    //接收客户端传递过来的参数
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    User user = new User();
    if(username == null || "".equals(username.trim())){
        request.setAttribute("error1", "用户名不能为空");
%>
    <jsp:forward page="LoginInput.jsp"></jsp:forward>
<%
    }
    
        if(password == null || "".equals(password.trim())){
            request.setAttribute("error2", "密码不能为空");
%>
    <jsp:forward page="LoginInput.jsp"></jsp:forward>
<%
    }
    
    
    //user.setUsername(username);
    //user.setPassword(password);
    user=null;
    UserDaoImpl userDao = new UserDaoImpl();
    try{
    
    user=userDao.Login(username);
    if(user==null){
        
        request.setAttribute("error3", "用户不存在");
%>
    <jsp:forward page="LoginInput.jsp"></jsp:forward>
<%
            }
    
    if(user.getUsername().equals(username)&&user.getPassword().equals(password))
    {
    %>

    <br>用户登录成功!!<br>
    <a href="Login.jsp">返回登录界面</a><br>
    <a href="addInput.jsp">注册</a><br>
    <a href="list.jsp">用户列表</a><br>
    <a href="deleteInput.jsp">删除</a><br>

<% 
    }
    
    else{
        %>
        密码错误！！<br>
        <a href="Login.jsp">返回登录界面</a><br>
        <%
        
    }

    }catch(UserException e){
%>
    <h2 style="color:red ; font-size:50px">发生错误 : <%=e.getMessage() %></h2>
    <%
    }
    %>
</html>

登录输入

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>用户登录页面</title>
<style>
#header{
background-color:#80FFFF;
color:white;
text-align:left;
padding:3px;
}
#section1{
background-color:whirt;
200px;
text-align:center;
margin: 0 auto;
padding:10px;

}
</style>
</head>
<body bgcolor="pink" >
<div id="header">
<h1>登录</h1>
<a href="addInput.jsp">注册新用户</a><br>
</div>

<br><br><br><br><br><br>
<body>
    <%=request.getAttribute("error") %>
    <form action="Login.jsp" method="get">
        <table align="center" border="1" width="500">
            <tr>
                <td>用户名称 : </td>
                <td>
                    <input type="text" name="username" />
                </td>
            </tr>
                <tr>
                <td>用户密码:</td>
                <td>
                    <input type="password" name="password" />
                </td>
            </tr>
            <tr align="center">
                <td colspan="2">
                    <input type="submit"  style="background:#4DFFFF" value="登录" />
                </td>
            </tr>
        </table>
    </form>
</body>
</html>

运行结果：

你对这门课的希望和自己的目标：希望在接下来几周内学习到更多的知识，对自己的目标是在结束这门课时有能力单独完成一个java web项目

具体列出你计划每周花多少时间在这门课上：

每周除去上课时间 ，每天保持至少1个半小时的时间