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)。
正如@MilacH指出的，在实现中有一个错误。如果返回statusCode > 400，则从拦截器抛出IOException，因为没有调用errorHandler。可以忽略异常，然后在处理程序方法中再次捕获异常。
package net.sprd.fulfillment.common;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpRequest;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import static java.nio.charset.StandardCharsets.UTF_8;
public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor {
final static Logger log = LoggerFactory.getLogger(LoggingRequestInterceptor.class);
@SuppressWarnings("HardcodedLineSeparator")
public static final char LINE_BREAK = '\n';
@Override
public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
try {
traceRequest(request, body);
} catch (Exception e) {
log.warn("Exception in LoggingRequestInterceptor while tracing request", e);
}
ClientHttpResponse response = execution.execute(request, body);
try {
traceResponse(response);
} catch (IOException e) {
// ignore the exception here, as it will be handled by the error handler of the restTemplate
log.warn("Exception in LoggingRequestInterceptor", e);
}
return response;
}
private void traceRequest(HttpRequest request, byte[] body) {
log.info("===========================request begin================================================");
log.info("URI : {}", request.getURI());
log.info("Method : {}", request.getMethod());
log.info("Headers : {}", request.getHeaders());
log.info("Request body: {}", new String(body, UTF_8));
log.info("==========================request end================================================");
}
private void traceResponse(ClientHttpResponse response) throws IOException {
StringBuilder inputStringBuilder = new StringBuilder();
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(response.getBody(), UTF_8))) {
String line = bufferedReader.readLine();
while (line != null) {
inputStringBuilder.append(line);
inputStringBuilder.append(LINE_BREAK);
line = bufferedReader.readLine();
}
}
log.info("============================response begin==========================================");
log.info("Status code : {}", response.getStatusCode());
log.info("Status text : {}", response.getStatusText());
log.info("Headers : {}", response.getHeaders());
log.info("Response body: {}", inputStringBuilder);
log.info("=======================response end=================================================");
}
}
如果您正在使用任何ClientHttpRequestInterceptor，那么使用BufferingClientHttpRequestFactory配置RestTemplate的技巧将不起作用，如果您试图通过拦截器进行日志记录，则会发生这种情况。这是由于InterceptingHttpAccessor (RestTemplate的子类)的工作方式。
长话短说……只需要使用这个类来代替RestTemplate(注意它使用SLF4J日志API，根据需要编辑):
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;
import javax.annotation.PostConstruct;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpRequest;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpRequestExecution;
import org.springframework.http.client.ClientHttpRequestInterceptor;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.RestTemplate;
/**
* A {@link RestTemplate} that logs every request and response.
*/
public class LoggingRestTemplate extends RestTemplate {
// Bleh, this class is not public
private static final String RESPONSE_WRAPPER_CLASS = "org.springframework.http.client.BufferingClientHttpResponseWrapper";
private Logger log = LoggerFactory.getLogger(this.getClass());
private boolean hideAuthorizationHeaders = true;
private Class<?> wrapperClass;
private Constructor<?> wrapperConstructor;
/**
* Configure the logger to log requests and responses to.
*
* @param log log destination, or null to disable
*/
public void setLogger(Logger log) {
this.log = log;
}
/**
* Configure the logger to log requests and responses to by name.
*
* @param name name of the log destination, or null to disable
*/
public void setLoggerName(String name) {
this.setLogger(name != null ? LoggerFactory.getLogger(name) : null);
}
/**
* Configure whether to hide the contents of {@code Authorization} headers.
*
* <p>
* Default true.
*
* @param hideAuthorizationHeaders true to hide, otherwise false
*/
public void setHideAuthorizationHeaders(boolean hideAuthorizationHeaders) {
this.hideAuthorizationHeaders = hideAuthorizationHeaders;
}
/**
* Log a request.
*/
protected void traceRequest(HttpRequest request, byte[] body) {
this.log.debug("xmit: {} {}\n{}{}", request.getMethod(), request.getURI(), this.toString(request.getHeaders()),
body != null && body.length > 0 ? "\n\n" + new String(body, StandardCharsets.UTF_8) : "");
}
/**
* Log a response.
*/
protected void traceResponse(ClientHttpResponse response) {
final ByteArrayOutputStream bodyBuf = new ByteArrayOutputStream();
HttpStatus statusCode = null;
try {
statusCode = response.getStatusCode();
} catch (IOException e) {
// ignore
}
String statusText = null;
try {
statusText = response.getStatusText();
} catch (IOException e) {
// ignore
}
try (final InputStream input = response.getBody()) {
byte[] b = new byte[1024];
int r;
while ((r = input.read(b)) != -1)
bodyBuf.write(b, 0, r);
} catch (IOException e) {
// ignore
}
this.log.debug("recv: {} {}\n{}{}", statusCode, statusText, this.toString(response.getHeaders()),
bodyBuf.size() > 0 ? "\n\n" + new String(bodyBuf.toByteArray(), StandardCharsets.UTF_8) : "");
}
@PostConstruct
private void addLoggingInterceptor() {
this.getInterceptors().add(new ClientHttpRequestInterceptor() {
@Override
public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution)
throws IOException {
// Log request
if (LoggingRestTemplate.this.log != null && LoggingRestTemplate.this.log.isDebugEnabled())
LoggingRestTemplate.this.traceRequest(request, body);
// Perform request
ClientHttpResponse response = execution.execute(request, body);
// Log response
if (LoggingRestTemplate.this.log != null && LoggingRestTemplate.this.log.isDebugEnabled()) {
final ClientHttpResponse bufferedResponse = LoggingRestTemplate.this.ensureBuffered(response);
if (bufferedResponse != null) {
LoggingRestTemplate.this.traceResponse(bufferedResponse);
response = bufferedResponse;
}
}
// Done
return response;
}
});
}
private ClientHttpResponse ensureBuffered(ClientHttpResponse response) {
try {
if (this.wrapperClass == null)
this.wrapperClass = Class.forName(RESPONSE_WRAPPER_CLASS, false, ClientHttpResponse.class.getClassLoader());
if (!this.wrapperClass.isInstance(response)) {
if (this.wrapperConstructor == null) {
this.wrapperConstructor = this.wrapperClass.getDeclaredConstructor(ClientHttpResponse.class);
this.wrapperConstructor.setAccessible(true);
}
response = (ClientHttpResponse)this.wrapperConstructor.newInstance(response);
}
return response;
} catch (Exception e) {
this.log.error("error creating {} instance: {}", RESPONSE_WRAPPER_CLASS, e);
return null;
}
}
private String toString(HttpHeaders headers) {
final StringBuilder headerBuf = new StringBuilder();
for (Map.Entry<String, List<String>> entry : headers.entrySet()) {
if (headerBuf.length() > 0)
headerBuf.append('\n');
final String name = entry.getKey();
for (String value : entry.getValue()) {
if (this.hideAuthorizationHeaders && name.equalsIgnoreCase(HttpHeaders.AUTHORIZATION))
value = "[omitted]";
headerBuf.append(name).append(": ").append(value);
}
}
return headerBuf.toString();
}
}
我同意花这么多功夫来做这件事很愚蠢。
您可以使用spring-rest-template-logger来记录RestTemplate HTTP流量。
在Maven项目中添加一个依赖项:
<dependency>
<groupId>org.hobsoft.spring</groupId>
<artifactId>spring-rest-template-logger</artifactId>
<version>2.0.0</version>
</dependency>
然后自定义你的RestTemplate，如下所示:
RestTemplate restTemplate = new RestTemplateBuilder()
.customizers(new LoggingCustomizer())
.build()
确保在application.properties中启用了调试日志记录:
logging.level.org.hobsoft.spring.resttemplatelogger.LoggingCustomizer = DEBUG
现在所有的RestTemplate HTTP流量将被记录到调试级别的org.hobsoft.spring.resttemplatelogger.LoggingCustomizer。
免责声明:这个库是我写的。
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
