在本示例中,我們將向您展示如何將對象轉換成json格式並通過spring mvc框架返回給用戶。
使用技術及環境:
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,稍後將被轉換成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
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