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;
@Controller
public 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。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
<!-- 启动spring mvc的注解功能,完成请求和注解POJO的映射 -->
<!-- 配置信息转换,将用@responsebody注解的返回值转换为json返回前台,
编码为utf-8-->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean
class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean>
<mvc:annotation-driven/>
</beans>
然后运行应该就能看到json格式的数据了。