使用xml/json格式傳輸數據 spring mvc（HttpMessageConverter的使用）

1.導入jar包（除spring之外的幾個jar包）

jackson-core-asl-1.4.2.jar

jackson-mapper-asl-1.4.2.jar

xstream-1.4.4.jar

xmlpull_1_0_5.jar

2 .配置文件

先看 spring-mvc的配置文件配置，在配置文件中添加以下內容：

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"
	   p:messageConverters-ref="messageConverters"/>
	
	<util:list id="messageConverters">
		<bean class="org.springframework.http.converter.BufferedImageHttpMessageConverter"/>
		<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
		<bean class="org.springframework.http.converter.StringHttpMessageConverter"/>
		<bean class="org.springframework.http.converter.xml.XmlAwareFormHttpMessageConverter"/>
		<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/>
		<bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter"
			 p:marshaller-ref="xmlMarshaller"
			p:unmarshaller-ref="xmlMarshaller" >
			</bean>
		
		
	</util:list>   
	 <bean id="xmlMarshaller" class="org.springframework.oxm.xstream.XStreamMarshaller">
		<property name="streamDriver">
			<bean class="com.thoughtworks.xstream.io.xml.StaxDriver"/>
		</property>
		<property name="annotatedClasses">
			<list>
				<value>com.wondersgroup.hs.test.model.User</value>
			</list>
		</property>
	</bean> 

注：如果測試無法成功，配置文件中如果有<mvc:annotation-driven/>,可以嘗試刪掉它，看能否成功。

3.Controller代碼

package com.wondersgroup.hs.test.controller;

import org.springframework.http.HttpEntity;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.wondersgroup.hs.test.model.User;

@Controller
@RequestMapping("/hmc")
public class HttpMessageConverterController {
	//共兩種方式綁定數據
	//1.使用ResponseEntity<T>/RequestEntity<T>
//	@RequestMapping(value="/method1")
//	public ResponseEntity<User> method1(HttpEntity<User> requestEntity){
//		User user = requestEntity.getBody();
//		user.setUserName("111");
//		return new ResponseEntity<User>(user,HttpStatus.OK);
//	}
	//2.使用@ResponseBody/@RequestBody
	@RequestMapping(value="/method1")
	@ResponseBody
	public User method1(@RequestBody User user){
		user.setUserName("111");
		return user;
	}
}

4.測試

package test.com.wondersgroup.hs.test.controller;


import java.io.IOException;
import java.util.Collections;


import org.junit.Test;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.json.MappingJacksonHttpMessageConverter;
import org.springframework.http.converter.xml.MarshallingHttpMessageConverter;
import org.springframework.oxm.xstream.XStreamMarshaller;
import org.springframework.web.client.RestTemplate;


import com.thoughtworks.xstream.io.xml.StaxDriver;
import com.wondersgroup.hs.test.model.User;




public class HttpMessageConverterControllerTest {
	@Test
	public void testMethod1() throws IOException{
		try{
			RestTemplate restTemplate = buildRestTemplate();
			
			User user = new User();
			user.setUserName("tom");
			user.setPassword("1234");
			user.setRealName("湯姆");
			
			HttpHeaders entityHeaders = new HttpHeaders();
			//xml傳輸
			entityHeaders.setContentType(MediaType.valueOf("application/xml;UTF-8"));
			entityHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_XML));
			//json傳輸
			//entityHeaders.setContentType(MediaType.valueOf("application/json;UTF-8"));
			//entityHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
			HttpEntity<User> requestEntity = new HttpEntity<User>(user,entityHeaders);
			ResponseEntity<User> responseEntity = restTemplate.exchange(
					"http://localhost:8081/SpringmvcDemo/hmc/method1.html", HttpMethod.POST, requestEntity, User.class);
			
			
			User responseUser = responseEntity.getBody();
			System.out.println(responseUser);
//			Assert.assertNotNull(responseUser);
//			Assert.assertEquals("1000", responseUser.getUserName())
		}catch(Exception e){ e.printStackTrace();}
		
	}
	
	private RestTemplate buildRestTemplate(){
		RestTemplate restTemplate = new RestTemplate();
		
		XStreamMarshaller xmlMarshaller = new XStreamMarshaller();
		xmlMarshaller.setStreamDriver(new StaxDriver());
		xmlMarshaller.setAnnotatedClasses(new Class[]{User.class});
		
		MarshallingHttpMessageConverter xmlConverter = new MarshallingHttpMessageConverter();
		xmlConverter.setMarshaller(xmlMarshaller);
		xmlConverter.setUnmarshaller(xmlMarshaller);
		restTemplate.getMessageConverters().add(xmlConverter);
		
		MappingJacksonHttpMessageConverter jsonConverter = 
			new MappingJacksonHttpMessageConverter();
		restTemplate.getMessageConverters().add(jsonConverter);
		return restTemplate;
	}
}

注意測試代碼中的，差異就在這幾行代碼當中。

			//xml傳輸
			entityHeaders.setContentType(MediaType.valueOf("application/xml;UTF-8"));
			entityHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_XML));
			//json傳輸
			//entityHeaders.setContentType(MediaType.valueOf("application/json;UTF-8"));
			//entityHeaders.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));