RestTemplate GET request抛出400个错误请求

Question

当我从JUnit测试用例向Rest服务发送请求时，我收到了400个坏请求。我的密码。错误日志快结束了。请帮我解决这个问题。当我通过直接在URL中传递参数来调用服务器为:restTemplate.getForObject(BASE_URL+“/Remote？ServiceName=SimpleService&Source=Web”,HelloWorld.Class）时，不会出现任何错误。但如何通过使用地图，这是问题来了。

我的控制器：

@Controller
@RequestMapping("/remote")

public class RESTController implements IController{

@RequestMapping(method = RequestMethod.GET, headers = "Accept=application/xml,  application/json")
public @ResponseBody HelloWorld getMessage(@RequestParam("serviceName") String serviceName, @RequestParam("source") String source) throws ApplicationException{
    System.out.println("got the request:");
    serviceLocator serviceLocator = new serviceLocator();
    HelloWorld helloWorld = new HelloWorld();
    helloWorld.setMessage(serviceLocator.getMessage(serviceName));
    return helloWorld;
}

我的配置：

<context:annotation-config />

<context:component-scan base-package="com" />

<mvc:annotation-driven />

<bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.FormHttpMessageConverter" />
            <bean
                class="org.springframework.http.converter.StringHttpMessageConverter" />
            <bean id="jsonViewResolver"
                class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper" ref="JacksonObjectMapper" />
                <property name="supportedMediaTypes">
                    <list>
                        <bean class="org.springframework.http.MediaType">
                            <constructor-arg value="application" />
                            <constructor-arg value="json" />
                            <constructor-arg
                                value="#{T(java.nio.charset.Charset).forName('UTF-8')}" />
                        </bean>
                    </list>
                </property>
            </bean>

        </list>
    </property>
</bean>
<bean id="JacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />

我的控制器测试：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("applicationContextTest.xml")
public class RESTControllerTest {

private static final String BASE_URL = "http://localhost:8080/SimpleServiceWeb/rest";

@Autowired
private RestTemplate restTemplate;

@Test
public void getMessage() throws Exception { 

    String expected = "Hello Spring!";
    HttpHeaders httpHeaders = new HttpHeaders();
    httpHeaders.setAccept(Collections
            .singletonList(MediaType.APPLICATION_XML));     

    MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
    map.add("serviceName", "simpleService");
    map.add("source", "WEB");

    ObjectMapper mapper = new ObjectMapper();
    ObjectWriter normalWriter = mapper.writer();
    String jsonString = normalWriter.writeValueAsString(map);;
    HttpEntity<Object> requestEntity = new HttpEntity<Object>(httpHeaders);     

    HelloWorld helloWorld = restTemplate.exchange(BASE_URL + "/remote",
             HttpMethod.GET, requestEntity, HelloWorld.class, map) .getBody();

    assertThat(helloWorld.getMessage(), is(expected));
}

<mvc:annotation-driven />

<bean id="springServiceLocator" class="com.servicelocator.simple.SpringServiceLocator">
    <property name="simpleService" ref="simpleService" />
</bean>

<bean id="simpleService" class="com.service.simple.SimpleService" />

<bean id="restTemplate" class="org.springframework.web.client.RestTemplate">

    <property name="messageConverters">
        <list>
            <bean class="org.springframework.http.converter.FormHttpMessageConverter" />
            <bean
                class="org.springframework.http.converter.StringHttpMessageConverter" />
            <bean id="jsonViewResolver"
                class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper" ref="JacksonObjectMapper" />
                <property name="supportedMediaTypes">
                    <list>
                        <bean class="org.springframework.http.MediaType">
                            <constructor-arg value="application" />
                            <constructor-arg value="json" />
                            <constructor-arg
                                value="#{T(java.nio.charset.Charset).forName('UTF-8')}" />
                        </bean>
                    </list>
                </property>
            </bean>

        </list>
    </property>
</bean>
<bean id="JacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />

<bean id="httpClient" class="org.apache.commons.httpclient.HttpClient">
    <constructor-arg ref="httpClientParams" />
</bean>

<bean id="httpClientParams" class="org.apache.commons.httpclient.params.HttpClientParams">

    <property name="connectionManagerClass"
        value="org.apache.commons.httpclient.MultiThreadedHttpConnectionManager" />
</bean>

<bean id="httpClientFactory"
    class="org.springframework.http.client.CommonsClientHttpRequestFactory">
    <constructor-arg ref="httpClient" />
</bean>

Answer 1

1. 您的控制器接受application/xml和application/json类型。
2. 仅在messageConverters中配置了JSON转换器，我没有看到任何XML转换器。
3. 在测试用例中，您将媒体类型设置为application/xml。

是否由于缺少xml转换器，Spring无法适当地封送您的请求，因此给出了400？但是，正如控制器中提到的，媒体类型是受支持的，这就是为什么您没有得到415的原因。