springmvc中请求json和响应json

步骤

1. 导入jar包

    <!--json处理-->
   <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
   <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-core</artifactId>
       <version>2.10.3</version>
   </dependency>
   <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
   <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
       <version>2.10.3</version>
   </dependency>
   <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
   <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-annotations</artifactId>
       <version>2.10.3</version>
   </dependency>
   

2. 手动将jar包加入tomcat容器中

3. 对应方法上加上@ResponseBody，请求参数上加@RequestBody

JSON的格式

单个字符串：“zhangsan”，

数组：["张三"，“李四”]

List : ["张三"，“李四”]

javabean : {"id":"1","name":"张三"}

Map : {"id":"1","name":"张三"}

ajax请求

1. 加入juery标签库

2. 例子

   <script src="https://cdn.staticfile.org/jquery/3.5.1/jquery.min.js"></script>
   <script type="application/javascript">
     $(function () {
       // 请求参数是单一字符串
       $("#btnJson1").click(function () {
         $.ajax({
           url:"${pageContext.request.contextPath}/json05",
           method:"post",
           data:"张三",
           contentType:'application/json',
           dataType:"json",
           success:function (user) {
             alert(JSON.stringify(user));
           }
         });
       });
       // 请求参数是数组
       $("#btnJson2").click(function () {
           $.ajax({
             url:"${pageContext.request.contextPath}/json06",
             method: "post",
             data: '["张三"，“李四”]',
             contentType: "application/json",
             dataType: "json",
             success:function (user) {
               alert(JSON.stringify(user));
             }
           });
       });
     });
   </script>