在本示例中，我們將向您展示如何將對象轉換成json格式并通過spring mvc框架返回給用戶。
使用技術及環境：
- Spring 3.2.2.RELEASE
- Jackson 1.9.10
- JDK 1.6
- Eclipse 3.6
- Maven 3
PS：在spring 3 中，要輸出json數據，只需要添加Jackson 庫到你的classpath。
1、項目依賴
spring和jackson的依賴：
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
一個簡單的JavaBean，稍后將被轉換成json格式輸出。
public class Shop {
String name;
String staffName[];
//getter and setter methods
}
3、Controller
添加@ResponseBody到返回值，我們看到：
Jackson 包已經在項目的 classpath
mvc:annotation-driven注解已經啟用
返回方法已經添加了@ResponseBody
spring會自動處理json的轉換。
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配置文件中啟用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、示例結果
訪問URL：http://localhost:8080/SpringMVC/rest/kfc/brands/kfc-kampar
spring-mvc-json-demo
感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
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