ssm-03-spring-mvc-02-simple-login

尝试使用spring mvc来实现简单的登录功能，pom依赖这里不一一列出来。

搭建Hello World.jsp：

新建maven工程：

webapp

配置smart tomcat：

运行空项目，验证tomcat配置：

搭建Hello World controller：

创建java、resources和test目录并分别标记为Sources、Resources、Tests：

resources目录下创建Spring配置文件：applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
        <beans xmlns="http://www.springframework.org/schema/beans"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns:context="http://www.springframework.org/schema/context"
               xmlns:mvc="http://www.springframework.org/schema/mvc"
               xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--自动扫描spring注解的组件，避免臃肿的bean配置-->
    <!--注解组件包括：@Component, @Repository, @Service, @Controller, @RestController, @ControllerAdvice, @Configuration-->
    <!--base-package：包含有注解组件的包名-->
    <context:component-scan base-package="com.zx.demo"/>
    <!--注解驱动，spring mvc专属配置，主要注册了dispatcher所需的RequestMappingHandlerMapping和RequestMappingHandlerAdapter-->
    <mvc:annotation-driven/>
</beans>

package com.zx.demo;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
//@Controller配置声明的组件会被Spring自动装配
@Controller
public class TestController {
    //@RequestMapping注解对应：RequestMappingHandlerMapping
    @RequestMapping("/hello")
    //@ResponseBody注解表示可以直接向前端返回java对象
    @ResponseBody
    public String test() {
        //返回字符串
        return "Hello world test.";
    }
}

部署并运行tomcat，浏览器中输入：http://localhost:8080/hello，成功后展示如下：

接入Mysql和Mybatis

创建数据表并插入一条测试数据：

编写mapper

UserMapper.java:

package com.zx.demo.dao;
import org.apache.ibatis.annotations.Param;
import java.util.Map;
public interface UserMapper {
    Map<Object, Object> login(@Param("loginName") String loginName, @Param("loginPwd") String loginPwd);
}

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.zx.demo.dao.UserMapper">
    <select id="login" resultType="map">
        SELECT * FROM `user` WHERE login_name = #{loginName} AND login_pwd = #{loginPwd} LIMIT 1;
    </select>
</mapper>

配置数据源和Mybatis

<!--配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="url" value="jdbc:mysql://xxx.xx/mydb"/>
    <property name="username" value="test"/>
    <property name="password" value="testxxx"/>
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
</bean>
<!--配置Mybatis-sqlSession-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" value="classpath*:**/*Mapper.xml"/>
</bean>
<!--配置mapper-->
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
    <property name="mapperInterface" value="com.zx.demo.dao.UserMapper"/>
    <property name="sqlSessionFactory" ref="sqlSession"/>
</bean>

编写service和实现类

UserService.java:

package com.zx.demo.service;
import java.util.Map;
public interface UserService {
    Map<Object, Object> login(String loginName, String loginPwd);
}

UserService.java:

package com.zx.demo.service;
import com.zx.demo.dao.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.Map;
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    UserMapper userMapper;
    @Override
    public Map<Object, Object> login(String loginName, String loginPwd) {
        return userMapper.login(loginName, loginPwd);
    }
}

编写controller

UserController.java

package com.zx.demo.controller;
import com.zx.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.util.Map;
@RestController
public class UserController {
    @Autowired
    UserService userService;
    @RequestMapping("/login")
    public String login(@RequestParam("loginName") String loginName, @RequestParam("password") String loginPwd) {
        System.out.println("loginName:" + loginName + "\tloginPwd:" + loginPwd);
        Map<Object, Object> user = userService.login(loginName, loginPwd);
        if (user != null) {
            return user.get("id").toString();
        } else {
            return "-1";
        }
    }
}

部署并运行tomcat，浏览器中输入：http://localhost:8080/simple-login/login?loginName=test&password=123456，成功后展示如下：

部署前，将项目Context Path设置为simple-login

加入简单的前端页面

下述几个html页面，都在webapp目录下创建

编写简单登录页

login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
    <script>
    $(document).ready(function(){
        $("#btnLogin").click(function(){
            var loginName = $("#loginName").val();
            var password = $("#password").val();
            $.post("/simple-login/login",
            {
                loginName:loginName,
                password:password,
            },
            function(data,status){
                if(status == "success" && data == 1){
                    window.location.href="/simple-login/homepage.html";
                }else{
                    alert("登录失败");
                }
            })
        })
    });
    </script>
</head>
<body>
<h1>登录</h1>
登录名：<input id="loginName" type="text"/><br/><br/>
密    码：<input id="password" type="password"/><br/><br/>
<button id="btnLogin">登录</button>
</body>
</html>

编写简单主页

homepage.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>主页</title>
</head>
<body>
<h1 style="text-align: center">主页</h1>
</body>
</html>

Spring配置文件中，加上静态资源servlet配置

<!--配置后，静态资源将会走容器默认servlet，否则会出现404-->
<mvc:default-servlet-handler/>

完整Spring配置：

<?xml version="1.0" encoding="UTF-8"?>
        <beans xmlns="http://www.springframework.org/schema/beans"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns:context="http://www.springframework.org/schema/context"
               xmlns:mvc="http://www.springframework.org/schema/mvc"
               xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--自动扫描spring注解的组件，避免臃肿的bean配置-->
    <!--注解组件包括：@Component, @Repository, @Service, @Controller, @RestController, @ControllerAdvice, @Configuration-->
    <!--base-package：包含有注解组件的包名-->
    <context:component-scan base-package="com.zx.demo"/>
    <!--注解驱动，spring mvc专属配置，主要注册了dispatcher所需的RequestMappingHandlerMapping和RequestMappingHandlerAdapter-->
    <mvc:annotation-driven/>
    <!--配置后，静态资源将会走容器默认servlet，否则会出现404-->
    <mvc:default-servlet-handler/>
    <!--配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="url" value="jdbc:mysql://xxx.xx/mydb"/>
        <property name="username" value="test"/>
        <property name="password" value="testxxx"/>
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    </bean>
    <!--配置Mybatis-sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath*:**/*Mapper.xml"/>
    </bean>
    <!--配置mapper-->
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="mapperInterface" value="com.zx.demo.dao.UserMapper"/>
        <property name="sqlSessionFactory" ref="sqlSession"/>
    </bean>
</beans>

部署并运行tomcat，浏览器中输入：http://localhost:8080/simple-login/login.html，成功后展示如下：

输入错误的用户名和密码-页面会提示登录失败：

输入正确的用户名和密码-页面会跳转到主页：

这样，一个简单的hello world式登录功能即完成。

posted @ 2021-12-23 17:07 zhoux_top 阅读(30) 评论(0) 编辑收藏举报

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ssm-03-spring-mvc-02-simple-login

ssm-03-spring-mvc-02-simple-login

搭建Hello World.jsp：

搭建Hello World controller：

接入Mysql和Mybatis

加入简单的前端页面

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