综合练习-用户模块

作者: 通灵路耳 | 来源:发表于2020-06-21 15:20 被阅读0次

综合练习-用户模块
综合练习-产品模块
综合练习-订单模块
地理模块综合练习讲解
综合练习-购物车模块
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1-4 需求分析实例
计算机毕业设计SpringBoot+Vue.js学前教育图片智能

总图

图片.png

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链接：https://pan.baidu.com/s/13yIlRuOmRd-_OSnKMnfl5A 
提取码：7nr3

1、补充web.xml

    <servlet>
        <servlet-name>UserLoginServlet</servlet-name>
        <servlet-class>com.llhc.servlet.UserLoginServlet</servlet-class>
    </servlet>
 
    <servlet-mapping>
        <servlet-name>UserLoginServlet</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
2、用户model

package com.llhc.model;

public class User {
   private int id;
   private String name;
   private String password;
   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getPassword() {
       return password;
   }
   public void setPassword(String password) {
       this.password = password;
   }
}

3、dao层

package com.llhc.dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import com.llhc.model.User;
public class UserDao {
    public User getUser(String name,String password){
        //产品查询
        User user = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/db_web_cart?characterEncoding=UTF-8","root","root");
            String sql = "select * from user where name = ? and password = ?";
            PreparedStatement p=conn.prepareStatement(sql);
            p.setString(1, name);
            p.setString(2, password);
            ResultSet rs=p.executeQuery();
            while(rs.next()){
                user=new User();
                user.setId(rs.getInt("id"));
                user.setPassword(password);
                user.setName(name);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
        return user;
    }
}

4、Servlet层

package com.llhc.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.llhc.dao.UserDao;
import com.llhc.model.User;
public class UserLoginServlet extends HttpServlet{
    @Override
    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doPost(req,resp);
    }
    @Override
    public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        String name = req.getParameter("name");
        String password = req.getParameter("password");
        UserDao p = new UserDao();
        User u=p.getUser(name, password);
        if(null != u){
            req.getSession().setAttribute("user", u);
            resp.sendRedirect("listProduct");
        }else{
            resp.sendRedirect("login.jsp");
        }
    }
}


5、前端页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<form action="login" method="post">
    账号： <input type="text" name="name"> <br>
    密码： <input type="password" name="password"> <br>
    <input type="submit" value="登录">
</form>

6、访问：http://localhost/Cart/login.jsp