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
http://maven.apache.org/maven-v4_0_0.xsd">
<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>http://maven.apache.org</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="
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、示例结果
访问URL：http://localhost:8080/SpringMVC/rest/kfc/brands/kfc-kampar
spring-mvc-json-demo
感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！
