线上实训锋芒毕露——用户查询

最新推荐文章于 2025-12-16 15:49:30 发布

原创最新推荐文章于 2025-12-16 15:49:30 发布 · 228 阅读

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#spring

本文介绍了一个基于Java的用户登录验证及管理系统，包括User类的定义，用于存储用户ID、用户名和密码；UserController类处理登录请求并调用UserService进行验证；UserService实现登录验证逻辑，通过UserDao查找用户；UserDao负责数据访问，包括按用户名查找用户和获取所有用户。

//User
package com.zhongruan.bean;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class User {

public User() {
}

public User(int id, String username, String password) {
    this.id = id;
    this.username = username;
    this.password = password;
}

public User(String username, String password) {
    this.username = username;
    this.password = password;
}

private int id;
private String username;
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 getPassword() {
    return password;
}

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

@Override
public String toString() {
    return "User{" +
            "id=" + id +
            ", username='" + username + '\'' +
            ", password='" + password + '\'' +
            '}';
}

}

//UserController
package com.zhongruan.controller;

import com.zhongruan.bean.User;
import com.zhongruan.service.IUserService;
import com.zhongruan.service.impl.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

@Controller
@RequestMapping("/user")
public class UserController {

@Autowired
private IUserService userService;

@RequestMapping("/login.do")
public ModelAndView login(User user){
    boolean flag = userService.login(user.getUsername(), user.getPassword());
    ModelAndView modelAndView=new ModelAndView();
    if(flag){
        modelAndView.setViewName("main");
    }else {
        modelAndView.setViewName("../failer");
    }
   return modelAndView;

}

@RequestMapping("/findAll.do")
public ModelAndView findAll(){
    List<User> userList = userService.findAll();
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.addObject("userList",userList);
    modelAndView.setViewName("user-list");
    return modelAndView;
}

}

//UserDao
package com.zhongruan.dao;

import com.zhongruan.bean.User;

import java.util.List;

public interface UserDao {
User findUserByUserName(String username);

List<User> findAll();

}

//UserService
package com.zhongruan.service.impl;

import com.zhongruan.bean.User;
import com.zhongruan.dao.UserDao;
import com.zhongruan.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class UserService implements IUserService {

@Autowired
private UserDao userDao;

@Override
public boolean login(String username, String password) {
    User user = userDao.findUserByUserName(username);
    if (user!=null && user.getPassword().equals(password)){
        return true;
    }
    return false;
}

@Override
public List<User> findAll() {
    return userDao.findAll();
}

}

//IUserService
package com.zhongruan.service;

import com.zhongruan.bean.User;

import java.util.List;

public interface IUserService {
boolean login(String username,String password);

List<User> findAll();

}

//Usermapper

<?xml version="1.0" encoding="UTF-8" ?>

    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

select * from wzbc1 where username=#{username}

<select id="findAll" resultType="user">
    select * from wzbc1
</select>

//index.jsp
<%@ page language=“java” contentType=“text/html; charset=UTF-8”
pageEncoding=“UTF-8”%>

线上实训 锋芒毕露——用户查询

线上实训锋芒毕露——用户查询