Spring mvc实现Restful返回json格式数据实例详解

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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

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