How to Integrate JQuery, Spring MVC\'s @RequestBody, and JSON for Bidirectional Serialization?

JQuery, Spring MVC @RequestBody, and JSON – Making Them Work Together

While serializing Java objects to JSON for JQuery consumption may be straightforward, the reverse path—parsing JSON and converting it into Java objects—can pose challenges. This article will guide you through the steps necessary to make this bidirectional serialization a reality.

The Problem: JSON to Java Using @RequestBody

To deserialize JSON into a Java object using Spring MVC @RequestBody, it is essential to register the MappingJacksonHttpMessageConverter. While this can be done manually, the simplest method is to use in XML or @EnableWebMvc in Java.

A Working Example

Consider the following example, which showcases a complete solution for bidrectional JSON serialization:

Maven POM

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

Servlet Mapping

<servlet-mapping>
    <servlet-name>json</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

#### Spring Bean Configuration

<import resource="classpath:mvc-context.xml" />

#### `mvc-context.xml`

<mvc:annotation-driven />
<context:component-scan base-package="test.json" />

#### Controller

@Controller
@RequestMapping("/test")
public class TestController {

@RequestMapping(method = RequestMethod.POST, value = "math")
@ResponseBody
public Result math(@RequestBody final Request request) {...}

}

#### Domain Objects

public class Request {

// ... fields and getters/setters ...

}

public class Result {

// ... fields and getters/setters ...

}

#### Testing the Setup

Using the Poster Firefox plugin, send a POST request to the following URL:

URL: http://localhost:8080/test/math
mime type: application/json
post body: { "left": 13 , "right" : 7 }

#### Expected Response

{"addition":20,"subtraction":6,"multiplication":91}

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