Spring 3 MVC and JSON example

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老外写的文章真的很易懂！
原文地址：http://www.mkyong.com/spring-mvc/spring-3-mvc-and-json-example/

Published: July 28, 2011 , Updated: July 27, 2011 , Author: mkyong

In Spring 3, you can enable “mvc:annotation-driven” to support object conversion to/from JSON format, if Jackson JSON processor is existed on the project classpath.

In this tutorial, we show you how to output JSON data from Spring MVC.

Technologies used :

Spring 3.0.5.RELEASE
Jackson 1.7.1
JDK 1.6
Eclipse 3.6
Maven 3

1. Project Dependencies

To use JSON in Spring MVC, you need to include Jackson dependency.

<properties>

        <spring.version>3.0.5.RELEASE</spring.version>

    </properties>

    <dependencies>

        <!-- Jackson JSON Mapper -->

        <dependency>

            <groupId>org.codehaus.jackson</groupId>

            <artifactId>jackson-mapper-asl</artifactId>

            <version>1.9.9</version>

        </dependency>

        <!-- Spring 3 dependencies -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-web</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-webmvc</artifactId>

            <version>${spring.version}</version>

        </dependency>

    </dependencies>

2. Model

A simple POJO, later convert this object into JSON output.

package com.mkyong.common.model;

public class Shop {

    String name;

    String staffName[];

    //getter and setter methods

}

3. Controller

Add “@ResponseBody” in the return value, no much detail in the Spring documentation.

As i know, when Spring see Jackson library existed on classpath, “mvc:annotation-driven” is enabled. Return method annotated with @ResponseBody.It will handle the JSON conversion automatically.

package com.mkyong.common.controller;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.ResponseBody;

import com.mkyong.common.model.Shop;

@Controller

@RequestMapping("/kfc/brands")

public class JSONController {

    @RequestMapping(value="{name}", method = RequestMethod.GET)

    public @ResponseBody Shop getShopInJSON(@PathVariable String name) {

        Shop shop = new Shop();

        shop.setName(name);

        shop.setStaffName(new String[]{"mkyong1", "mkyong2"});

        return shop;

    }

}

4. mvc:annotation-driven

Enable “mvc:annotation-driven” in your Spring configuration XML file.

<beans xmlns="http://www.springframework.org/schema/beans"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-3.0.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <context:component-scan base-package="com.mkyong.common.controller" />

    <mvc:annotation-driven />

</beans>

5. Demo

URL : http://localhost:8080/SpringMVC/rest/kfc/brands/kfc-kampar

Download Source Code

Download it – SpringMVC-Json-Example.zip (21 KB)

References