Spring MVC JSON (JSON to Java)(pull)

最新推荐文章于 2025-07-29 10:30:56 发布

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文章标签：

#Json #Spring MVC #Controller

Spring MVC 同时被 3 个专栏收录

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本文介绍如何使用Spring MVC处理客户端发送的JSON数据，并将其自动映射到Java对象中。包括使用jQuery.ajax发送POST请求的方法，以及如何配置Spring MVC来实现这一过程。

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sing Spring MVC we can send to the client data in JSON format, but what if the client sends POST request with data in JSON format? Here we will see how Spring MVC “auto” maps JSON data sent by client POST request into Java object.

Objectives:

How client request “GET” data in json format?
How client send “POST” data in json format using jQuery.ajax()?
How Spring MVC Controller can map json into java object?

Environment:

Eclipse
Maven (optional)
Browser (Firefox, Chrome or IE)
Java Server (Jetty, Apache,…)

Libraries:

Spring Framework
Jackson
jQuery

 <dependencies>
        <dependency><!-- spring mvc -->
            <groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>3.0.5.RELEASE</version>
        </dependency>
        <dependency><!-- jackson -->
            <groupId>org.codehaus.jackson</groupId><artifactId>jackson-mapper-asl</artifactId><version>1.4.2</version>
        </dependency>
    </dependencies>

( 1 ) Java Project

( 2 ) Java Code & XML Configuration

RestController.java

 
         package 
         com.hmkcode.controllers; 
        
         import 
         javax.servlet.http.HttpServletResponse; 
        
         import 
         org.springframework.stereotype.Controller; 
        
         import 
         org.springframework.web.bind.annotation.RequestBody; 
        
         import 
         org.springframework.web.bind.annotation.RequestMapping; 
        
         import 
         org.springframework.web.bind.annotation.RequestMethod; 
        
         import 
         org.springframework.web.bind.annotation.ResponseBody; 
        
         import 
         com.hmkcode.vo.Person; 
        
         @Controller
        
         @RequestMapping
         (
         "/cont"
         ) 
        
         public 
         class 
         RestController { 
        
         public 
         RestController(){ 
        
         System.out.println(
         "init RestController"
         ); 
        
         } 
        
         //this method responses to GET request http://localhost/spring-mvc-json/rest/cont 
        
         // return Person object as json 
        
         @RequestMapping
         (method = RequestMethod.GET) 
        
         public 
         @ResponseBody 
         Person get(HttpServletResponse res) { 
        
         Person person = 
         new 
         Person(); 
        
         person.setId(
         1
         ); 
        
         person.setName(
         "hmk"
         ); 
        
         return 
         person; 
        
         } 
        
         //this method response to POST request http://localhost/spring-mvc-json/rest/cont/person 
        
         // receives json data sent by client --> map it to Person object 
        
         // return Person object as json 
        
         @RequestMapping
         (value=
         "person"
         , method = RequestMethod.POST) 
        
         public 
         @ResponseBody 
         Person post( 
         @RequestBody 
         final  
         Person person) {     
        
         System.out.println(person.getId() + 
         " " 
         + person.getName()); 
        
         return 
         person; 
        
         } 
        
         }

Person.java

 
         package 
         com.hmkcode.vo; 
        
         import 
         java.io.Serializable; 
        
         public 
         class 
         Person 
         implements 
         Serializable { 
        
         private 
         static 
         final 
         long 
         serialVersionUID = 1L; 
        
         private 
         int 
         id; 
        
         private 
         String name; 
        
         //getters and setters...
        
         }

rest-servlet.xml

 
         <
         beans 
         ...> 
        
         <
         context:component-scan 
         base-package
         =
         "com.hmkcode.controllers" 
         /> 
        
         <
         mvc:annotation-driven 
         /> 
        
         </
         beans
         >

web.xml

         .......
        
         <
         servlet
         > 
        
         <
         servlet-name
         >rest</
         servlet-name
         > 
        
         <
         servlet-class
         >org.springframework.web.servlet.DispatcherServlet</
         servlet-class
         > 
        
         </
         servlet
         > 
        
         <
         servlet-mapping
         > 
        
         <
         servlet-name
         >rest</
         servlet-name
         > 
        
         <
         url-pattern
         >/rest/*</
         url-pattern
         > 
        
         </
         servlet-mapping
         >

index.html –> $.ajax()

         <html>
        
         ......
        
         <script src=
         "http://code.jquery.com/jquery-1.9.1.js"
         ></script> 
        
         <script type=
         "text/javascript" 
         > 
        
         $(document).ready(
         function
         (){ 
        
         sendAjax(); 
        
         });
        
         function 
         sendAjax() { 
        
         $.ajax({ 
        
         url: 
         "/spring-mvc-json/rest/cont/person"
         ,  
        
         type: 
         'POST'
         ,  
        
         dataType: 
         'json'
         ,  
        
         data: 
         "{\"name\":\"hmkcode\",\"id\":2}"
         ,  
        
         contentType: 
         'application/json'
         , 
        
         mimeType: 
         'application/json'
         , 
        
         success: 
         function
         (data) {  
        
         alert(data.id + 
         " " 
         + data.name); 
        
         }, 
        
         error:
         function
         (data,status,er) {  
        
         alert(
         "error: "
         +data+
         " status: "
         +status+
         " er:"
         +er); 
        
         } 
        
         });
        
         }
        
         </script>
        
         ......
        
         </html>

( 3 ) Run & Test

Run Jetty “or your” server

http://localhost:8080/spring-mvc-json/rest/cont
Thsi url will call the first method RestController.get() return Person object in json format

http://localhost:8080/spring-mvc-json/index.html
This html page contains jQuery.ajax() function that will call the second method RestController.post() on the load of the paeg.
$.ajax() will send json data data: “{\”name\”:\”hmkcode\”,\”id\”:2}”
Controller will receive this json data mapp into java object using @RequestBody
Controller will return data again to the client in json format too.

Soruce Code: @ github