我已经使用Spring RestTemplate有一段时间了，当我试图调试它的请求和响应时，我总是碰壁。我基本上希望看到与打开“verbose”选项时使用curl时相同的东西。例如:
curl -v http://twitter.com/statuses/public_timeline.rss
将显示发送的数据和接收的数据(包括头、cookie等)。
我看了一些相关的帖子，比如:
如何在Spring RestTemplate中记录响应?
但我还没能解决这个问题。
实现这一点的一种方法是实际更改RestTemplate源代码，并在那里添加一些额外的日志记录语句，但我认为这种方法确实是最后的办法。应该有某种方法告诉Spring Web Client/RestTemplate以一种更友好的方式记录所有内容。
我的目标是能够用如下代码做到这一点:
restTemplate.put("http://someurl", objectToPut, urlPathValues);
然后在日志文件或控制台中获得相同类型的调试信息(就像我使用curl获得的一样)。
我相信这对于任何使用Spring RestTemplate并且遇到问题的人来说都是非常有用的。使用curl来调试RestTemplate问题是行不通的(在某些情况下)。
奇怪的是，这些解决方案都不能工作，因为RestTemplate似乎不会在某些客户机和服务器上返回500x错误的响应。在这种情况下，您还必须通过实现ResponseErrorHandler来记录这些日志，如下所示。这是一个代码草案，但你明白了:
你可以设置与错误处理程序相同的拦截器:
restTemplate.getInterceptors().add(interceptor);
restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(new SimpleClientHttpRequestFactory()));
restTemplate.setErrorHandler(interceptor);
拦截实现了两个接口:
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpRequest;
import org.springframework.http.HttpStatus.Series;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.ResponseErrorHandler;
public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor, ResponseErrorHandler {
static final Logger log = LoggerFactory.getLogger(LoggingRequestInterceptor.class);
static final DefaultResponseErrorHandler defaultResponseErrorHandler = new DefaultResponseErrorHandler();
final Set<Series> loggableStatuses = new HashSet();
public LoggingRequestInterceptor() {
}
public LoggingRequestInterceptor(Set<Series> loggableStatuses) {
loggableStatuses.addAll(loggableStatuses);
}
public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
this.traceRequest(request, body);
ClientHttpResponse response = execution.execute(request, body);
if(response != null) {
this.traceResponse(response);
}
return response;
}
private void traceRequest(HttpRequest request, byte[] body) throws IOException {
log.debug("===========================request begin================================================");
log.debug("URI : {}", request.getURI());
log.debug("Method : {}", request.getMethod());
log.debug("Headers : {}", request.getHeaders());
log.debug("Request body: {}", new String(body, "UTF-8"));
log.debug("==========================request end================================================");
}
private void traceResponse(ClientHttpResponse response) throws IOException {
if(this.loggableStatuses.isEmpty() || this.loggableStatuses.contains(response.getStatusCode().series())) {
StringBuilder inputStringBuilder = new StringBuilder();
try {
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response.getBody(), "UTF-8"));
for(String line = bufferedReader.readLine(); line != null; line = bufferedReader.readLine()) {
inputStringBuilder.append(line);
inputStringBuilder.append('\n');
}
} catch (Throwable var5) {
log.error("cannot read response due to error", var5);
}
log.debug("============================response begin==========================================");
log.debug("Status code : {}", response.getStatusCode());
log.debug("Status text : {}", response.getStatusText());
log.debug("Headers : {}", response.getHeaders());
log.debug("Response body: {}", inputStringBuilder.toString());
log.debug("=======================response end=================================================");
}
}
public boolean hasError(ClientHttpResponse response) throws IOException {
return defaultResponseErrorHandler.hasError(response);
}
public void handleError(ClientHttpResponse response) throws IOException {
this.traceResponse(response);
defaultResponseErrorHandler.handleError(response);
}
}
下面是我用来在RestTemplate中记录整个http请求/响应而不丢失响应体信息的解决方案。Spring引导版本为<version>2.7.5</version>
1.创建LoggingInterceptor类
@Component
@Slf4j
public class LoggingInterceptor implements ClientHttpRequestInterceptor {
@Override
public ClientHttpResponse intercept(final HttpRequest request, final byte[] body, final ClientHttpRequestExecution execution) throws IOException {
traceRequest(request, body);
ClientHttpResponse response = execution.execute(request, body);
response = traceResponse(response);
return response;
}
private void traceRequest(HttpRequest request, byte[] body) throws IOException {
if (!log.isDebugEnabled()) {
return;
}
log.debug("=========================== Request Begin ===========================");
log.debug("URI : " + request.getURI());
log.debug("Method : " + request.getMethod());
log.debug("Headers : " + request.getHeaders());
log.debug("Body : " + new String(body, "utf-8"));
log.debug("============================ Request End ============================");
}
private ClientHttpResponse traceResponse(ClientHttpResponse response) throws IOException {
if (!log.isDebugEnabled()) {
return response;
}
ClientHttpResponse newCopiedResponse = new BufferingClientHttpResponseWrapper(response);
StringBuilder inputStringBuilder = new StringBuilder();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(newCopiedResponse.getBody(), "UTF-8"));
String line = bufferedReader.readLine();
while (line != null) {
inputStringBuilder.append(line);
line = bufferedReader.readLine();
}
log.debug("=========================== Response Begin ===========================");
log.debug("Status code : {}", response.getStatusCode());
log.debug("Status text : {}", response.getStatusText());
log.debug("Headers : {}", response.getHeaders());
log.debug("Response Body : {}", inputStringBuilder.toString());
log.debug("============================ Response End ============================");
return newCopiedResponse;
}
/**
* Wrapper around ClientHttpResponse, buffers the body so it can be read repeatedly (for logging & consuming the result).
*/
private static class BufferingClientHttpResponseWrapper implements ClientHttpResponse {
private final ClientHttpResponse response;
private byte[] body;
public BufferingClientHttpResponseWrapper(ClientHttpResponse response) {
this.response = response;
}
@Override
public InputStream getBody() throws IOException {
if (body == null) {
body = StreamUtils.copyToByteArray(response.getBody());
}
return new ByteArrayInputStream(body);
}
@Override
public HttpStatus getStatusCode() throws IOException {
return this.response.getStatusCode();
}
@Override
public int getRawStatusCode() throws IOException {
return this.response.getRawStatusCode();
}
@Override
public String getStatusText() throws IOException {
return this.response.getStatusText();
}
@Override
public HttpHeaders getHeaders() {
return this.response.getHeaders();
}
@Override
public void close() {
this.response.close();
}
}
}
2.将其附加到RestTemplate bean
@Configuration
public class RestTemplateConfig {
@Bean
public RestTemplate createRestTemplate(LoggingInterceptor loggingInterceptor) {
RestTemplate restTemplate = new RestTemplate();
restTemplate.setInterceptors(Collections.singletonList(loggingInterceptor));
return restTemplate;
}
}
3.在应用程序中应用适当的级别
logging:
level:
com:
test: DEBUG
这些答案都不能完全解决问题。Mjj1409实现了大部分功能，但方便地避免了记录响应的问题，因为这需要更多的工作。Paul Sabou提供了一个看似现实的解决方案，但没有提供足够的细节来实际实现(对我来说根本没用)。Sofiene得到了日志记录，但遇到了一个严重的问题:响应不再可读，因为输入流已经被消耗了!
我建议使用BufferingClientHttpResponseWrapper来包装响应对象，以允许多次读取响应体:
public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor {
private static final Logger logger = LoggerFactory.getLogger(LoggingRequestInterceptor.class);
@Override
public ClientHttpResponse intercept(final HttpRequest request, final byte[] body,
final ClientHttpRequestExecution execution) throws IOException {
ClientHttpResponse response = execution.execute(request, body);
response = log(request, body, response);
return response;
}
private ClientHttpResponse log(final HttpRequest request, final byte[] body, final ClientHttpResponse response) {
final ClientHttpResponse responseCopy = new BufferingClientHttpResponseWrapper(response);
logger.debug("Method: ", request.getMethod().toString());
logger.debug("URI: ", , request.getURI().toString());
logger.debug("Request Body: " + new String(body));
logger.debug("Response body: " + IOUtils.toString(responseCopy.getBody()));
return responseCopy;
}
}
这将不会消耗InputStream，因为响应体被加载到内存中，可以多次读取。如果你的类路径上没有BufferingClientHttpResponseWrapper，你可以在这里找到简单的实现:
https://github.com/spring-projects/spring-android/blob/master/spring-android-rest-template/src/main/java/org/springframework/http/client/BufferingClientHttpResponseWrapper.java
设置RestTemplate:
LoggingRequestInterceptor loggingInterceptor = new LoggingRequestInterceptor();
restTemplate.getInterceptors().add(loggingInterceptor);
我的日志记录器配置使用XML
<logger name="org.springframework.web.client.RestTemplate">
<level value="trace"/>
</logger>
然后你会得到如下内容:
DEBUG org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:92) : Reading [com.test.java.MyClass] as "application/json" using [org.springframework.http.converter.json.MappingJackson2HttpMessageConverter@604525f1]
通过HttpMessageConverterExtractor.java:92，你需要继续调试，在我的情况下，我得到了这个:
genericMessageConverter.write(requestBody, requestBodyType, requestContentType, httpRequest);
这:
outputMessage.getBody().flush();
outputMessage.getBody()包含http(post类型)发送的消息
现在最好的解决方案，只需添加依赖项:
<dependency>
<groupId>com.github.zg2pro</groupId>
<artifactId>spring-rest-basis</artifactId>
<version>v.x</version>
</dependency>
它包含一个LoggingRequestInterceptor类，你可以这样添加到你的RestTemplate:
通过将它作为拦截器添加到spring RestTemplate中来集成这个实用程序，方法如下:
restTemplate.setRequestFactory(LoggingRequestFactoryFactory.build());
并将slf4j实现添加到您的框架，如log4j。
或直接使用“Zg2proRestTemplate”。@PaulSabou的“最佳答案”看起来一般，因为httpclient和所有apache。使用spring RestTemplate时，不一定会加载http库。
