如果与ClientHttpRequestInterceptor一起使用，Spring Resttemplate postforobject返回null作为对象响应

基于Spring MVC 4的配置应用程序应用上下文: <bean id="restTemplate" class="org.springframework.web.client.RestTemplate"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/> </list> </property> <property name="interceptors"> <list> <bean class="com.sipl.interceptors.LoggingRequestInterceptor" /> </list> </property></bean> Jackson POM <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson.version}</version> </dependency>拦截器类public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor { final static Logger logger = LoggerFactory.getLogger(LoggingRequestInterceptor.class); @Override public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException { traceRequest(request, body); ClientHttpResponse response = execution.execute(request, body); traceResponse(response); return response; } private void traceRequest(HttpRequest request, byte[] body) throws IOException { logger.debug("===========================request begin================================================"); logger.debug("URI : " + request.getURI()); logger.debug("Method : " + request.getMethod()); logger.debug("Request Body : " + new String(body, "UTF-8")); logger.debug("==========================request end================================================"); } private void traceResponse(ClientHttpResponse response) throws IOException { StringBuilder inputStringBuilder = new StringBuilder(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response.getBody(), "UTF-8")); String line = bufferedReader.readLine(); while (line != null) { inputStringBuilder.append(line); inputStringBuilder.append('\n'); line = bufferedReader.readLine(); } logger.debug("============================response begin=========================================="); logger.debug("status code: " + response.getStatusCode()); logger.debug("status text: " + response.getStatusText()); logger.debug("Response Body : " + inputStringBuilder.toString()); logger.debug("=======================response end================================================="); }} GetAllEmployeesClass public class GetAllEmployeesVO { private ResponseVO response; private List<EmployeeBean> employees; private String actionCode; public String getActionCode() { return actionCode; } public void setActionCode(String actionCode) { this.actionCode = actionCode; } public ResponseVO getResponse() { return response; } public void setResponse(ResponseVO response) { this.response = response; } public List<EmployeeBean> getEmployees() { return employees; } public void setEmployees(List<EmployeeBean> employees) { this.employees = employees; }}控制器@RestControllerpublic class RestAdminstrationController { @Autowired private RestTemplate restTemplate; @Value("${rest.getallemployees.api.endpoint}") private String getEmpEndpt; @RequestMapping(value = AppConstatants.GET_EXISTING_APP_USERS, method = RequestMethod.POST) public List<EmployeeBean> loadAppAdminUsers(@RequestBody GetAllEmployeesVO userData) { try { //get Rest Service Data GetAllEmployeesVO resp= restTemplate.postForObject(getEmpEndpt,userData,GetAllEmployeesVO.class); //resp is coming as null请求响应HTTP有效负载日志: 2015-12-12 15:45:53 DEBUG RestTemplate:79 - Created POST request for "http://103.35.123.23:8080/siplrestservices/sipl/EmployeeService/getAllEmployees"2015-12-12 15:45:53 DEBUG RestTemplate:720 - Setting request Accept header to [application/json, application/*+json]2015-12-12 15:45:53 DEBUG RestTemplate:797 - Writing [com.sipl.common.beans.GetAllEmployeesVO@1dd42575] using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@52e7339f]2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:36 - ===========================request begin================================================2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:38 - URI : http://xxxxx:8080/siplrestservices/sipl/EmployeeService/getAllEmployees2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:39 - Method : POST2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:40 - Request Body : {"response":null,"employees":null,"actionCode":"M"}2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:41 - ==========================request end================================================2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:53 - ============================response begin==========================================2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:54 - status code: 2012015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:55 - status text: Created2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:56 - **Response Body : {"employees":[{"commonName":"MOHAN KUMAR GHOSHAL","countryCode":"","dateOfJoining":"2015-11-23","designationId":"4","division":"GENERAL","emailId":"","employeeId":"1","employeeNo":"M-392","employeeStatus":"1","hqCityId":"2","lastWorkingDate":"2015-11-23","mobile":{"mobileStatus":"1"},"mobileNo":"1234567890"}],"response":{"respCd":"0","respDesc":"SUCCESS"}}**2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:57 - =======================response end=================================================2015-12-12 15:45:54 DEBUG RestTemplate:632 - POST request for "http://xxxxx:8080/siplrestservices/sipl/EmployeeService/getAllEmployees" resulted in 201 (Created)解决方案您可以使用BufferingClientHttpRequestFactory.它允许多次读取响应.I am trying to consume a rest service and i am posting some data, with Spring RestTemplate postForObjectMethod but i am getting a null response, even though i can see the request and response in payload.[Update] I am using an interceptor implmenting ClientHttpRequestInterceptor, if i remove it, i am getting the response.[PS: the service is configured as POST, ideally it should be GET for obvious reason, but i am still curious why no response is coming as part of post, even i can see the same in http logs.]Configuration Spring MVC 4 based applicationApplication context: <bean id="restTemplate" class="org.springframework.web.client.RestTemplate"> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/> </list> </property> <property name="interceptors"> <list> <bean class="com.sipl.interceptors.LoggingRequestInterceptor" /> </list> </property></bean>Jackson POM<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>${jackson.version}</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>${jackson.version}</version> </dependency>Interceptor Classpublic class LoggingRequestInterceptor implements ClientHttpRequestInterceptor { final static Logger logger = LoggerFactory.getLogger(LoggingRequestInterceptor.class); @Override public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException { traceRequest(request, body); ClientHttpResponse response = execution.execute(request, body); traceResponse(response); return response; } private void traceRequest(HttpRequest request, byte[] body) throws IOException { logger.debug("===========================request begin================================================"); logger.debug("URI : " + request.getURI()); logger.debug("Method : " + request.getMethod()); logger.debug("Request Body : " + new String(body, "UTF-8")); logger.debug("==========================request end================================================"); } private void traceResponse(ClientHttpResponse response) throws IOException { StringBuilder inputStringBuilder = new StringBuilder(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response.getBody(), "UTF-8")); String line = bufferedReader.readLine(); while (line != null) { inputStringBuilder.append(line); inputStringBuilder.append('\n'); line = bufferedReader.readLine(); } logger.debug("============================response begin=========================================="); logger.debug("status code: " + response.getStatusCode()); logger.debug("status text: " + response.getStatusText()); logger.debug("Response Body : " + inputStringBuilder.toString()); logger.debug("=======================response end================================================="); }}GetAllEmployeesClasspublic class GetAllEmployeesVO { private ResponseVO response; private List<EmployeeBean> employees; private String actionCode; public String getActionCode() { return actionCode; } public void setActionCode(String actionCode) { this.actionCode = actionCode; } public ResponseVO getResponse() { return response; } public void setResponse(ResponseVO response) { this.response = response; } public List<EmployeeBean> getEmployees() { return employees; } public void setEmployees(List<EmployeeBean> employees) { this.employees = employees; }}Controller @RestControllerpublic class RestAdminstrationController { @Autowired private RestTemplate restTemplate; @Value("${rest.getallemployees.api.endpoint}") private String getEmpEndpt; @RequestMapping(value = AppConstatants.GET_EXISTING_APP_USERS, method = RequestMethod.POST) public List<EmployeeBean> loadAppAdminUsers(@RequestBody GetAllEmployeesVO userData) { try { //get Rest Service Data GetAllEmployeesVO resp= restTemplate.postForObject(getEmpEndpt,userData,GetAllEmployeesVO.class); //resp is coming as nullRequest Response HTTP payload logs:2015-12-12 15:45:53 DEBUG RestTemplate:79 - Created POST request for "http://103.35.123.23:8080/siplrestservices/sipl/EmployeeService/getAllEmployees"2015-12-12 15:45:53 DEBUG RestTemplate:720 - Setting request Accept header to [application/json, application/*+json]2015-12-12 15:45:53 DEBUG RestTemplate:797 - Writing [com.sipl.common.beans.GetAllEmployeesVO@1dd42575] using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@52e7339f]2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:36 - ===========================request begin================================================2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:38 - URI : http://xxxxx:8080/siplrestservices/sipl/EmployeeService/getAllEmployees2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:39 - Method : POST2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:40 - Request Body : {"response":null,"employees":null,"actionCode":"M"}2015-12-12 15:45:53 DEBUG LoggingRequestInterceptor:41 - ==========================request end================================================2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:53 - ============================response begin==========================================2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:54 - status code: 2012015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:55 - status text: Created2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:56 - **Response Body : {"employees":[{"commonName":"MOHAN KUMAR GHOSHAL","countryCode":"","dateOfJoining":"2015-11-23","designationId":"4","division":"GENERAL","emailId":"","employeeId":"1","employeeNo":"M-392","employeeStatus":"1","hqCityId":"2","lastWorkingDate":"2015-11-23","mobile":{"mobileStatus":"1"},"mobileNo":"1234567890"}],"response":{"respCd":"0","respDesc":"SUCCESS"}}**2015-12-12 15:45:54 DEBUG LoggingRequestInterceptor:57 - =======================response end=================================================2015-12-12 15:45:54 DEBUG RestTemplate:632 - POST request for "http://xxxxx:8080/siplrestservices/sipl/EmployeeService/getAllEmployees" resulted in 201 (Created) 解决方案 You can use BufferingClientHttpRequestFactory.It allows multiple reading of the response. 这篇关于如果与ClientHttpRequestInterceptor一起使用，Spring Resttemplate postforobject返回null作为对象响应的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！