在本示例中，我们将向您展示如何将对象转换成json格式并通过spring mvc框架返回给用户。
使用技术及环境：
Spring 3.2.2.RELEASE
Jackson 1.9.10
JDK 1.6
Eclipse 3.6
Maven 3
PS：在spring 3 中，要输出json数据，只需要添加Jackson 库到你的classpath。
1、项目依赖
spring和jackson的依赖：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 "> <modelVersion>4.0.0</modelVersion> <groupId>com.mkyong.common</groupId> <artifactId>SpringMVC</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>SpringMVC Json Webapp</name> <url></url> <properties> <spring.version>3.2.2.RELEASE</spring.version> <jackson.version>1.9.10</jackson.version> <jdk.version>1.6</jdk.version> </properties> <dependencies> <!-- 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>${spring.version}</version> </dependency> <!-- Jackson JSON Mapper --> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>${jackson.version}</version> </dependency> </dependencies> <build> <finalName>SpringMVC</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-eclipse-plugin</artifactId> <version>2.9</version> <configuration> <downloadSources>true</downloadSources> <downloadJavadocs>false</downloadJavadocs> <wtpversion>2.0</wtpversion> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>${jdk.version}</source> <target>${jdk.version}</target> </configuration> </plugin> </plugins> </build> </project>
2、Model
一个简单的JavaBean，稍后将被转换成json格式输出。
public class Shop { String name; String staffName[]; //getter and setter methods }
3、Controller
添加@ResponseBody到返回值，我们看到：
Jackson 包已经在项目的 classpath
mvc:annotation-driven注解已经启用
返回方法已经添加了@ResponseBody
spring会自动处理json的转换。
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](https://my.oschina.net/u/1774615) @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
在你的spring配置文件中启用mvc:annotation-driven注解。
<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=" "> <context:component-scan base-package="com.mkyong.common.controller" /> <mvc:annotation-driven /> </beans>
5、示例结果
访问URL：:8080/SpringMVC/rest/kfc/brands/kfc-kampar
spring-mvc-json-demo
