下面是一个使用@responseBody的小例子:
必须有正确spring配置文件:
<mvc:annotation-driven>
<mvc:message-converters>
<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="com.fasterxml.jackson.databind.ObjectMapper">
<property name="dateFormat">
<bean class="java.text.SimpleDateFormat">
<constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss"/>
</bean>
</property>
</bean>
</property>
</bean>
<!-- 解决乱码问题 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
<property name="messageConverters">
<list>
<bean class = "org.springframework.http.converter.StringHttpMessageConverter">
<property name = "supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
所需的maven的依赖库(必不可少):
<dependencies>
<dependency>
<groupId>com.test1</groupId>
<artifactId>subtest1</artifactId>
<version>0.0.2-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-adb</artifactId>
<version>${axis2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-transport-http</artifactId>
<version>${axis2.version}</version>
</dependency>
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-transport-local</artifactId>
<version>${axis2.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.0.pr2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.9.0.pr2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.0.pr2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<scope>provided</scope>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.8.RELEASE</version>
</dependency>
</dependencies>
控制层代码:
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.pojo.TestBean;
@Controller
public class ServiceC {
@RequestMapping(value="/jsontest")
public @ResponseBody List<TestBean> getJSON() {
List<TestBean> testBean = new ArrayList<TestBean>();
testBean.add(TestBean.generateContent("ee", new Date(), "test", "test"));
testBean.add(TestBean.generateContent("ee", new Date(), "test", "test"));
testBean.add(TestBean.generateContent("ee", new Date(), "test", "test"));
testBean.add(TestBean.generateContent("呃呃", new Date(), "呃呃", "test"));
return testBean;
}
}
在浏览器中访问:http://localhost:8080/(项目名)/jsontest,即可访问,页面中会返回一个上面testBean生成的json字符串
一. 浏览器返回406
@requestMapping中的注解参数可能有问题,它没有把返回值当成json处理。
二.浏览器返回500,javax.servlet.ServletException: Circular view path […]: would dispatch back to the current handler URL [/…] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)
对照以上正确的例子,@responseBody要加上,配置文件里的内容要写对。这里注意,配置文件中的类是新版本的json处理包com.fasterxml.jackson.core中的MappingJackson2HttpMessageConverter,而不是MappingJacksonHttpMessageConverter。