来看下RestTemplate中默认的的ResponseErrorHandler:
package org.springframework.web.client;
import java.io.IOException;
import java.nio.charset.Charset;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.util.FileCopyUtils;
/**
* Spring's default implementation of the {@link ResponseErrorHandler} interface.
*
* <p>This error handler checks for the status code on the {@link ClientHttpResponse}:
* Any code with series {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR}
* or {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR} is considered to be
* an error; this behavior can be changed by overriding the {@link #hasError(HttpStatus)}
* method. Unknown status codes will be ignored by {@link #hasError(ClientHttpResponse)}.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 3.0
* @see RestTemplate#setErrorHandler
*/
public class DefaultResponseErrorHandler implements ResponseErrorHandler {
/**
* Delegates to {@link #hasError(HttpStatus)} with the response status code.
*/
@Override
public boolean hasError(ClientHttpResponse response) throws IOException {
HttpStatus statusCode = HttpStatus.resolve(response.getRawStatusCode());
return (statusCode != null && hasError(statusCode));
}
/**
* Template method called from {@link #hasError(ClientHttpResponse)}.
* <p>The default implementation checks if the given status code is
* {@link HttpStatus.Series#CLIENT_ERROR CLIENT_ERROR} or
* {@link HttpStatus.Series#SERVER_ERROR SERVER_ERROR}.
* Can be overridden in subclasses.
* @param statusCode the HTTP status code
* @return {@code true} if the response has an error; {@code false} otherwise
*/
protected boolean hasError(HttpStatus statusCode) {
return (statusCode.series() == HttpStatus.Series.CLIENT_ERROR ||
statusCode.series() == HttpStatus.Series.SERVER_ERROR);
}
/**
* Delegates to {@link #handleError(ClientHttpResponse, HttpStatus)} with the response status code.
*/
@Override
public void handleError(ClientHttpResponse response) throws IOException {
HttpStatus statusCode = HttpStatus.resolve(response.getRawStatusCode());
if (statusCode == null) {
throw new UnknownHttpStatusCodeException(response.getRawStatusCode(), response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
}
handleError(response, statusCode);
}
/**
* Handle the error in the given response with the given resolved status code.
* <p>This default implementation throws a {@link HttpClientErrorException} if the response status code
* is {@link org.springframework.http.HttpStatus.Series#CLIENT_ERROR}, a {@link HttpServerErrorException}
* if it is {@link org.springframework.http.HttpStatus.Series#SERVER_ERROR},
* and a {@link RestClientException} in other cases.
* @since 5.0
*/
protected void handleError(ClientHttpResponse response, HttpStatus statusCode) throws IOException {
switch (statusCode.series()) {
case CLIENT_ERROR:
throw new HttpClientErrorException(statusCode, response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
case SERVER_ERROR:
throw new HttpServerErrorException(statusCode, response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
default:
throw new UnknownHttpStatusCodeException(statusCode.value(), response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
}
}
/**
* Determine the HTTP status of the given response.
* @param response the response to inspect
* @return the associated HTTP status
* @throws IOException in case of I/O errors
* @throws UnknownHttpStatusCodeException in case of an unknown status code
* that cannot be represented with the {@link HttpStatus} enum
* @since 4.3.8
* @deprecated as of 5.0, in favor of {@link #handleError(ClientHttpResponse, HttpStatus)}
*/
@Deprecated
protected HttpStatus getHttpStatusCode(ClientHttpResponse response) throws IOException {
HttpStatus statusCode = HttpStatus.resolve(response.getRawStatusCode());
if (statusCode == null) {
throw new UnknownHttpStatusCodeException(response.getRawStatusCode(), response.getStatusText(),
response.getHeaders(), getResponseBody(response), getCharset(response));
}
return statusCode;
}
/**
* Read the body of the given response (for inclusion in a status exception).
* @param response the response to inspect
* @return the response body as a byte array,
* or an empty byte array if the body could not be read
* @since 4.3.8
*/
protected byte[] getResponseBody(ClientHttpResponse response) {
try {
return FileCopyUtils.copyToByteArray(response.getBody());
}
catch (IOException ex) {
// ignore
}
return new byte[0];
}
/**
* Determine the charset of the response (for inclusion in a status exception).
* @param response the response to inspect
* @return the associated charset, or {@code null} if none
* @since 4.3.8
*/
@Nullable
protected Charset getCharset(ClientHttpResponse response) {
HttpHeaders headers = response.getHeaders();
MediaType contentType = headers.getContentType();
return (contentType != null ? contentType.getCharset() : null);
}
}
/**
* Execute the given method on the provided URI.
* <p>The {@link ClientHttpRequest} is processed using the {@link RequestCallback};
* the response with the {@link ResponseExtractor}.
* @param url the fully-expanded URL to connect to
* @param method the HTTP method to execute (GET, POST, etc.)
* @param requestCallback object that prepares the request (can be {@code null})
* @param responseExtractor object that extracts the return value from the response (can be {@code null})
* @return an arbitrary object, as returned by the {@link ResponseExtractor}
*/
@Nullable
protected <T> T doExecute(URI url, @Nullable HttpMethod method, @Nullable RequestCallback requestCallback,
@Nullable ResponseExtractor<T> responseExtractor) throws RestClientException {
Assert.notNull(url, "'url' must not be null");
Assert.notNull(method, "'method' must not be null");
ClientHttpResponse response = null;
try {
ClientHttpRequest request = createRequest(url, method);
if (requestCallback != null) {
requestCallback.doWithRequest(request);
}
response = request.execute();
handleResponse(url, method, response);
if (responseExtractor != null) {
return responseExtractor.extractData(response);
}
else {
return null;
}
}
catch (IOException ex) {
String resource = url.toString();
String query = url.getRawQuery();
resource = (query != null ? resource.substring(0, resource.indexOf('?')) : resource);
throw new ResourceAccessException("I/O error on " + method.name() +
" request for \"" + resource + "\": " + ex.getMessage(), ex);
}
finally {
if (response != null) {
response.close();
}
}
}
/**
* Simple implementation of {@link ClientHttpRequest} that wraps another request.
*
* @author Arjen Poutsma
* @since 3.1
*/
final class BufferingClientHttpRequestWrapper extends AbstractBufferingClientHttpRequest {
private final ClientHttpRequest request;
BufferingClientHttpRequestWrapper(ClientHttpRequest request) {
this.request = request;
}
@Override
@Nullable
public HttpMethod getMethod() {
return this.request.getMethod();
}
@Override
public String getMethodValue() {
return this.request.getMethodValue();
}
@Override
public URI getURI() {
return this.request.getURI();
}
@Override
protected ClientHttpResponse executeInternal(HttpHeaders headers, byte[] bufferedOutput) throws IOException {
this.request.getHeaders().putAll(headers);
StreamUtils.copy(bufferedOutput, this.request.getBody());
ClientHttpResponse response = this.request.execute();
return new BufferingClientHttpResponseWrapper(response);
}
}
org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://zkh-gbb-website/user": Connect to 172.16.5.45:8080 [/172.16.5.45] failed: connect timed out; nested exception is org.apache.http.conn.ConnectTimeoutException: Connect to 172.16.5.45:8080 [/172.16.5.45] failed: connect timed out
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:741)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:684)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:332)
at com.zkh360.api.TestObjectMapperControllerTest.testObjectMapper(TestObjectMapperControllerTest.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: org.apache.http.conn.ConnectTimeoutException: Connect to 172.16.5.45:8080 [/172.16.5.45] failed: connect timed out
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:151)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:373)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:381)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:237)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:185)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:111)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)
at org.springframework.http.client.HttpComponentsClientHttpRequest.executeInternal(HttpComponentsClientHttpRequest.java:87)
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53)
at org.springframework.http.client.BufferingClientHttpRequestWrapper.executeInternal(BufferingClientHttpRequestWrapper.java:63)
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53)
at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:108)
at org.springframework.cloud.client.loadbalancer.LoadBalancerRequestFactory.lambda$createRequest$0(LoadBalancerRequestFactory.java:59)
at org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.execute(RibbonLoadBalancerClient.java:112)
at org.springframework.cloud.client.loadbalancer.RetryLoadBalancerInterceptor.lambda$intercept$0(RetryLoadBalancerInterceptor.java:76)
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287)
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:180)
at org.springframework.cloud.client.loadbalancer.RetryLoadBalancerInterceptor.intercept(RetryLoadBalancerInterceptor.java:67)
at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:92)
at com.zkh360.core.config.LoggingClientHttpRequestInterceptor.intercept(RestTemplateConfig.java:290)
at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:92)
at org.springframework.http.client.InterceptingClientHttpRequest.executeInternal(InterceptingClientHttpRequest.java:76)
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48)
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:727)
... 33 more
Caused by: java.net.SocketTimeoutException: connect timed out
at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:75)
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:142)
... 62 more
17:14:36.979 [main] DEBUG org.springframework.web.client.RestTemplate - Created GET request for "http://localhost:8080/test/session/get"
17:14:36.992 [main] DEBUG org.springframework.web.client.RestTemplate - Setting request Accept header to [application/json, application/*+json]
17:14:37.007 [main] DEBUG org.apache.http.client.protocol.RequestAddCookies - CookieSpec selected: default
17:14:37.015 [main] DEBUG org.apache.http.client.protocol.RequestAuthCache - Auth cache not set in the context
17:14:37.016 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection request: [route: {}->http://localhost:8080][total kept alive: 0; route allocated: 0 of 200; total allocated: 0 of 300]
17:14:37.028 [main] DEBUG org.apache.http.impl.conn.PoolingHttpClientConnectionManager - Connection leased: [id: 0][route: {}->http://localhost:8080][total kept alive: 0; route allocated: 1 of 200; total allocated: 1 of 300]
17:14:37.030 [main] DEBUG org.apache.http.impl.execchain.MainClientExec - Opening connection {}->http://localhost:8080
17:14:37.037 [main] DEBUG org.apache.http.impl.conn.DefaultHttpClientConnectionOperator - Connecting to localhost/127.0.0.1:8080
17:14:37.038 [main] DEBUG org.apache.http.impl.conn.DefaultHttpClientConnectionOperator - Connection established 127.0.0.1:60552<->127.0.0.1:8080
17:14:37.038 [main] DEBUG org.apache.http.impl.conn.DefaultManagedHttpClientConnection - http-outgoing-0: set socket timeout to 5000
17:14:37.038 [main] DEBUG org.apache.http.impl.execchain.MainClientExec - Executing request GET /test/session/get HTTP/1.1
17:14:37.038 [main] DEBUG org.apache.http.impl.execchain.MainClientExec - Target auth state: UNCHALLENGED
17:14:37.038 [main] DEBUG org.apache.http.impl.execchain.MainClientExec - Proxy auth state: UNCHALLENGED
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> GET /test/session/get HTTP/1.1
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Accept: application/json, application/*+json
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Content-Type: application/json;charset=UTF-8
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Host: localhost:8080
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Connection: Keep-Alive
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> User-Agent: Apache-HttpClient/4.5.6 (Java/1.8.0_144)
17:14:37.040 [main] DEBUG org.apache.http.headers - http-outgoing-0 >> Accept-Encoding: gzip,deflate
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "GET /test/session/get HTTP/1.1[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "Accept: application/json, application/*+json[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "Content-Type: application/json;charset=UTF-8[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "Host: localhost:8080[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "Connection: Keep-Alive[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "User-Agent: Apache-HttpClient/4.5.6 (Java/1.8.0_144)[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "Accept-Encoding: gzip,deflate[\r][\n]"
17:14:37.040 [main] DEBUG org.apache.http.wire - http-outgoing-0 >> "[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "HTTP/1.1 200 [\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "X-Application-Context: application:dev,redis,log,flyway[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "ETag: "099914b932bd37a50b983c5e7c90ae93b"[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "X-Content-Type-Options: nosniff[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "X-XSS-Protection: 1; mode=block[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "X-Frame-Options: DENY[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "Set-Cookie: SESSION=36fed5e6-fe6d-4b9e-87a1-7f7aa5ef8bf0; Path=/; HttpOnly[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "Content-Type: application/json[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "Content-Length: 2[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "Date: Thu, 13 Dec 2018 09:14:37 GMT[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "[\r][\n]"
17:14:37.056 [main] DEBUG org.apache.http.wire - http-outgoing-0 << "{}"
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << HTTP/1.1 200
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << X-Application-Context: application:dev,redis,log,flyway
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << ETag: "099914b932bd37a50b983c5e7c90ae93b"
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << X-Content-Type-Options: nosniff
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << X-XSS-Protection: 1; mode=block
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << X-Frame-Options: DENY
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Set-Cookie: SESSION=36fed5e6-fe6d-4b9e-87a1-7f7aa5ef8bf0; Path=/; HttpOnly
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Content-Type: application/json
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Content-Length: 2
17:14:37.058 [main] DEBUG org.apache.http.headers - http-outgoing-0 << Date: Thu, 13 Dec 2018 09:14:37 GMT
17:14:37.061 [main] DEBUG org.apache.http.impl.execchain.MainClientExec - Connection can be kept alive indefinitely
17:14:37.066 [main] DEBUG org.apache.http.client.protocol.ResponseProcessCookies - Cookie accepted [SESSION="36fed5e6-fe6d-4b9e-87a1-7f7aa5ef8bf0", version:0, domain:localhost, path:/, expiry:null]
感觉挺有意思的
