【JAVA】ssm框架搭建登录实现

• 前言
• 介绍Spring
• 前期准备
• 载入Tomcat
• 设置Maven

• bean下的User.java
• controller下的UserController.java
• dao下的UserDao.java
• service
• UserService.java
• Impl下的UserServiceImpl.java

• mapper下的UserMapper.xml

• WEB-INF下的web.xml
• index.jsp
• ok.jsp
• failure.jsp

前言

Java项目实习第五次课后作业：整理上课内容，实现登录功能。

介绍Spring

前期准备

载入Tomcat

图片见第三次课

设置Maven

Project整体

Java包

bean下的User.java

package com.zr0701.bean;

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;
}

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

controller下的UserController.java

package com.zr0701.controller;

import com.zr0701.bean.User;
import com.zr0701.service.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;

@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;

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

dao下的UserDao.java

package com.zr0701.dao;

import com.zr0701.bean.User;

public interface UserDao {
User findUserByName(String name);
}

service

UserService.java

package com.zr0701.service;

public interface UserService {
boolean login(String name,String password);
}

Impl下的UserServiceImpl.java

package com.zr0701.service.Impl;

import com.zr0701.bean.User;
import com.zr0701.dao.UserDao;
import com.zr0701.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

@Autowired
private UserDao userDao;

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

resources包

mapper下的UserMapper.xml

<?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" >
<mapper namespace="com.zr0701.dao.UserDao">
<select id="findUserByName" parameterType="String" resultType="User">
select * from user where name =#{name};
</select>
</mapper>

webapp包

WEB-INF下的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">

<!-- 配置加载类路径的配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext.xml</param-value>
</context-param>

<!-- 配置监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>

<!-- 解决中文乱码过滤器 -->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 前端控制器（加载classpath:spring-mvc.xml 服务器启动创建servlet） -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置初始化参数，创建完DispatcherServlet对象，加载springmvc.xml配置文件 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<!-- 服务器启动的时候，让DispatcherServlet对象创建 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<h1>登录页面</h1>
<form action="/user/login.do" method="post">
name:<input name="name" type="text">
password:<input name="password" type="password">
<input type="submit" value="login">
</form>
</body>
</html>

ok.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>成功</title>
</head>
<body>
<h1>成功</h1>
</body>
</html>

failure.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>失败</title>
</head>
<body>
<h1>失败</h1>
</body>
</html>

效果图

数据库user表数据

登录界面

输入已有账户即可，成功出现成功网页，反之为失败页面。