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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