在spring mvc3中，已经集成了Jackson(json处理器)来处理数据输出json格式,spring中封装的类是 org.springframework.http.converter.json.MappingJackson2HttpMessageConverter这个json转换器， 如果是springmvc3.2之前的版本,可以使用org.springframework.http.converter.MappingJacksonHttpMessageConverter这个json转换器。
Spring的详细介绍：这里
Json的详细介绍：这里
Spring mvc的详细介绍：这里
1.首先要添加maven的项目依赖，要在spring mvc中使用json的话，需要在项目中的pom.xml中包含Jackson的依赖项。
示例：
<dependencies> <dependency><groupId>com.fasterxml</groupId><artifactId>jackson-annotations</artifactId><version>2.1.1</version> </dependency> <dependency><groupId>com.fasterxml</groupId><artifactId>jackson-core</artifactId><version>2.1.1</version> </dependency> <dependency><groupId>com.fasterxml</groupId><artifactId>jackson-databind</artifactId><version>2.1.1</version> </dependency><!– Spring 3 dependencies –> <dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-expression</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-instrument</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-instrument-tomcat</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-jms</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-oxm</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-tx</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>3.2.0.RELEASE</version> </dependency> <dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>3.2.0.RELEASE</version> </dependency></dependencies>
2.建立一个POJO类，就以User类为例，这里就贴User类的代码了，大家都懂。
3.通过@Controller注解建立控制器
加上@ResponseBody
代码如下所示:
import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import com.Student;@Controllerpublic class TestJsonController {@RequestMapping(value="/finddata", method = RequestMethod.GET)public @ResponseBody Student getJSONData() {Student result = new Student();result.setUserName("360sdn.com");result.setArray(new String[]{"360sdn1", "360sdn2"});return result;}}4.配置Spring的servlet配置文件来配置json的输出转换器，但是在我的实际实践中发现不用配置Xml中的bean也能将数据转换为json格式的。
只有这样才不会被“不可能”束缚，才能不断超越自我。
