How to Enable Bidirectional JSON-Java Serialization with Spring MVC\'s @RequestBody?

Bidirectional JSON-Java Serialization Using Spring MVC RequestBody and JSON

Scenario and Problem

In a Java-based web application using Spring MVC, bidirectional data serialization between JSON and Java objects is sought. The Java-to-JSON path works well, but the reverse path—deserializing JSON input into a Java object through @RequestBody—encounters issues.

Solution

To enable bidirectional JSON-Java serialization, it is crucial to register the MappingJacksonHttpMessageConverter in the Spring MVC configuration. This can be achieved in two ways:

1. Through the tag in XML configuration
2. Using the @EnableWebMvc annotation in Java-based configuration

Once the message converter is registered, the code shown in the problem description should function as intended.

Working Example

To demonstrate the working example, a simple web application is provided below:

• Java: The Java source includes a controller (TestController) with a POST endpoint (/test/math), a request object (Request), and a result object (Result):

// ... code

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

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

}

// ... code

• Configuration: The /src/main/resources/mvc-context.xml file sets up Spring MVC with annotation-driven programming and component scanning:

<beans xmlns="http://www.springframework.org/schema/beans" ...>
    <annotation-driven></annotation-driven>
    <component-scan base-package="test.json"></component-scan>
</beans>

• Web Application: The web.xml file defines the Spring MVC servlet:

<web-app xmlns="http://java.sun.com/xml/ns/j2ee" ...>
    <servlet>
        <servlet-name>json</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>json</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

To test the application:

1. POST to http://localhost:8080/test/math with the following JSON body: {"left": 13, "right": 7}
2. The response will be JSON containing the results of the arithmetic operations (addition, subtraction, and multiplication) on the numbers provided in the request.

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