发ajax响应json格式数据

1、maven依赖

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

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.ly.mvc</groupId>
  <artifactId>springmvc02</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>springmvc02 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>13</maven.compiler.source>
    <maven.compiler.target>13</maven.compiler.target>
    <!--锁定spring版本-->
    <spring.version>5.0.2.RELEASE</spring.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.10</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.10</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.10</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>springmvc02</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
          <!--解决IDEA maven变更后自动重置LanguageLevel和JavaCompiler版本的问题-->
          <configuration>
            <source>${maven.compiler.source}</source>
            <target>${maven.compiler.target}</target>
          </configuration>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

2、请求页面 

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/2/27
  Time: 19:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <script src="js/jquery.min.js" type="text/javascript"></script>
    <script>
        $(function() {
            $("#btn").click(function() {
                $.ajax({
                    url:"test",
                    type:"post",
                    //请求数据类型
                    contentType:"application/json;charset=UTF-8",
                    //返回数据类型
                    dataType:"json",
                    //注意json格式字符串的写法
                    data:'{"name":"刘阳","age":28}',
                    success:function(data) {
                        console.info(data);
                        alert(data.name);
                        alert(data.age);
                    }
                });
            });
        });
    </script>
</head>
<body>
<button id="btn">按钮</button>
</body>
</html>

3、处理方法

    /**
     * @ResponseBody 将返回值以json格式返回到页面
     * @RequestBody 自动将RequestBody内容映射到User对象
     * @ResponseBody和@RequestBody需要如下jar包的支持
     * jackson-core
     * jackson-databind
     * jackson-annotations
     */
    @RequestMapping("/test")
    @ResponseBody
    public User test1(@RequestBody User u) {
        System.out.println(u);
        u.setAge(100);
        System.out.println(u);
        return u;
    }

4、总结

4.1、注意ajax请求data的json格式

4.2、处理方法中需使用@RequestBody注解将请求体映射到User对象

4.3、在处理方法上加上@ResponseBody注解将返回值以json格式响应到页面

4.4、@RequestBody和@ResponseBody注解需要jackson-core、jackson-databind、jackson-annotations jar包的支持

posted @ 2020-02-28 13:22  牛牛的自留地  阅读(366)  评论(0)  编辑  收藏  举报