Spring MVC JSON (JSON to Java)(pull)

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Spring MVC
Controller
Json

Json Spring MVC Controller

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

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passing JSON data to a Spring MVC contro ... | spring MVC 中json格式数据发送与接收

2014-01-20 09:51
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Spring MVC JSON (JSON to Java)(pull)

Objectives:

Environment:

Libraries:

( 1 ) Java Project

( 2 ) Java Code & XML Configuration

( 3 ) Run & Test

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最新评论

Spring MVC JSON (JSON to Java)(pull)

Objectives:

Environment:

Libraries:

( 1 ) Java Project

( 2 ) Java Code & XML Configuration

( 3 ) Run & Test

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