实现功能：登录验证

一、因为我是在SpringMVC框架上写的，首先得添加依赖：

<dependencies>
        <!-- 用来测试的依赖 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- 添加SpringMVC依赖，视情况添加 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>
        <!-- 添加MyBatis的依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!-- 添加MyBatis整合Spring的依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
        <!-- 其底层是基于JDBC的，所以，还需要添加Spring-jdbc的依赖，需要注意的是: 此依赖版本必须与Spring-webmvc的保持一致，也可以理解成带Spring-的版本都 
            保持一致 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>
        <!-- 根据使用的数据库，添加数据库连接驱动的依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.13</version>
        </dependency>
        <!-- 添加数据源的依赖 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>
        <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.8</version>
</dependency>

    </dependencies>

二、配置WEB-INF下的web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <display-name>AJAX_Exercise</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
   <servlet>
        <servlet-name>cn.tedu</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-*.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>cn.tedu</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <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>
</web-app>

三、在src/main/resources下创建spring-mvc.xml文件（文件名字自己取）并且配置：

<?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:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
 <!-- 上面的地址自己网上百度，填错了写标签名的时候开发工具不会自动提示 -->
 <!-- 组件扫描 cn.tedu下所有的包 -->
    <context:component-scan base-package="cn.tedu"></context:component-scan>
<!--     视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/"></property>
    <property name="suffix" value=".jsp"></property>
    </bean>
<!--     注解驱动 -->
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

四、src/main/java下创建两个包，包下分别创建类：

package cn.tedu.controller;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import cn.tedu.util.ResponseResult;

@RequestMapping("/user")
@Controller
public class UserController {
    @RequestMapping("/handle_login.do")
    @ResponseBody
    public ResponseResult<Void> handlelogin(String name, String password) {
        ResponseResult<Void> rr = new ResponseResult<Void>();
        if("root".equals(name)) {
            if("1234".equals(password)) {
                 rr.setState(1);
                rr.setMessage("正确");
            }else {
                 rr.setState(2);
                    rr.setMessage("密码错误");
            }
        }else {
             rr.setState(3);
                rr.setMessage("用户名错误");
        }
        
        return rr;
    
    }
    
}

package cn.tedu.util;

import java.io.Serializable;

public class ResponseResult<E> implements Serializable{
    /**
     * 
     */
    private static final long serialVersionUID = -3993852292142080674L;
    private Integer state;
    private String message;
    private E data;//E是范型
    public Integer getState() {
        return state;
    }
    public void setState(Integer state) {
        this.state = state;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }
    public E getData() {
        return data;
    }
    public void setData(E data) {
        this.data = data;
    }
    

}

五、在webapp下创建login.html文件：

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
    
</head>
<body>

    用户名：
    <input id="username" type="text" name="username">
    <br> 密码 ：
    <input id="password" type="password" name="password">
    <br>
    <input id="btn-login" type="button" value="确定">

    <script type="text/javascript" src="jquery-3.1.1.min.js"></script>
    <script type="text/javascript">
          $("#btn-login").click(function(){
         var u = $("#username").val();
         var p = $("#password").val();
         //发出异步请求，或取响应
         // 调用$.ajax()函数即可发出请求并处理响应结果
        // $.ajax()函数的参数是JSON对象
        // url：把请求提交到哪里，相当于<form>中的action
        // data：提交到服务器端的数据，格式：param1=value1&param2=value2
        // type：提交方式，取值为POST或GET
        // dataType：服务器端响应的数据的类型，可以是text、json、xml，取决于服务器响应时的响应头中例如"application/json"
        // success：服务器端成功响应时的回调函数，函数的参数就是服务器端响应的数据，并且已经转换为指定的格式
         $.ajax({
         "url":"user/handle_login.do",
         "data":"name="+u+"&password="+p,
         "type":"post",
         "dataType":"json",
         "success":function(json){
         if(json.state==1){
         alert("登录成功");
         }else{
         alert("用户名错误");
         }
         }
        
         });
         });  
    </script>
</body>
</html>

AJAX和JSON实际应用

实现功能：登录验证

一、因为我是在SpringMVC框架上写的，首先得添加依赖：

二、配置WEB-INF下的web.xml文件：

三、在src/main/resources下创建spring-mvc.xml文件（文件名字自己取）并且配置：

四、src/main/java下创建两个包，包下分别创建类：

五、在webapp下创建login.html文件：

六、打开浏览器输入地址可以得到json数据：

七、输入html地址进行测试：

参考地址1：https://www.cnblogs.com/package-java/p/10385773.html

参考地址2：https://www.cnblogs.com/package-java/p/10361071.html

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