java - 如何让RestTemplate永远不抛出异常

Question

我正在尝试更改实现 DefaultResponseErrorHandler 的 RestTemplate 的默认行为。我有以下代码:

@Override
public boolean hasError(ClientHttpResponse response) throws IOException{
    return false;
}

@Override
public void handleError(ClientHttpResponse response) throws IOException {
}

当我向 token 端点发出 HTTP 请求时:

RestTemplate restTemplate = new RestTemplate();
            restTemplate.setErrorHandler(new NoOpResponseHandler());
            HttpEntity<MultiValueMap<String, Object>> request = initRequest();//a function to retrieve the proper headers of my api
            String oauthUrl = buildUrl("/oauth/token");//this just builds my URL

            // ResponseEntity<?> entity = restTemplate.postForEntity(oauthUrl,
            // request, AccessToken.class);
            ResponseEntity<?> entity = restTemplate.exchange(oauthUrl, HttpMethod.POST, request, String.class);

我的NoOpResponseHandler代码:

package com.my.test.util;

import java.io.IOException;

import org.springframework.http.client.ClientHttpResponse;
import org.springframework.web.client.ResponseErrorHandler;

public class NoOpResponseHandler implements ResponseErrorHandler {


    @Override
    public boolean hasError(ClientHttpResponse response) throws IOException{
        return false;
    }

    @Override
    public void handleError(ClientHttpResponse response) throws IOException {
    }
}

堆栈跟踪:

org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:9001/oauth/token": cannot retry due to server authentication, in streaming mode; nested exception is java.net.HttpRetryException: cannot retry due to server authentication, in streaming mode
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:666)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613)
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:531)
    at com.resson.test.login.LoginSteps.lambda$7(LoginSteps.java:73)
    at ✽.Then the login is unsuccessful(features/01-login.feature:19)
Caused by: java.net.HttpRetryException: cannot retry due to server authentication, in streaming mode
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1674)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
    at org.springframework.http.client.SimpleClientHttpResponse.getRawStatusCode(SimpleClientHttpResponse.java:52)
    at org.springframework.http.client.AbstractClientHttpResponse.getStatusCode(AbstractClientHttpResponse.java:33)
    at org.springframework.web.client.MessageBodyClientHttpResponseWrapper.getStatusCode(MessageBodyClientHttpResponseWrapper.java:121)
    at org.springframework.web.client.MessageBodyClientHttpResponseWrapper.hasMessageBody(MessageBodyClientHttpResponseWrapper.java:59)
    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:82)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:917)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:901)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:655)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:613)
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:531)
    at com.resson.test.login.LoginSteps.lambda$7(LoginSteps.java:73)
    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 cucumber.runtime.Utils$1.call(Utils.java:40)
    at cucumber.runtime.Timeout.timeout(Timeout.java:16)
    at cucumber.runtime.Utils.invoke(Utils.java:34)
    at cucumber.runtime.java.Java8StepDefinition.execute(Java8StepDefinition.java:115)
    at cucumber.runtime.StepDefinitionMatch.runStep(StepDefinitionMatch.java:37)
    at cucumber.runtime.Runtime.runStep(Runtime.java:300)
    at cucumber.runtime.model.StepContainer.runStep(StepContainer.java:44)
    at cucumber.runtime.model.StepContainer.runSteps(StepContainer.java:39)
    at cucumber.runtime.model.CucumberScenario.run(CucumberScenario.java:44)
    at cucumber.runtime.junit.ExecutionUnitRunner.run(ExecutionUnitRunner.java:102)
    at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:63)
    at cucumber.runtime.junit.FeatureRunner.runChild(FeatureRunner.java:18)
    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.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at cucumber.runtime.junit.FeatureRunner.run(FeatureRunner.java:70)
    at cucumber.api.junit.Cucumber.runChild(Cucumber.java:95)
    at cucumber.api.junit.Cucumber.runChild(Cucumber.java:38)
    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.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at cucumber.api.junit.Cucumber.run(Cucumber.java:100)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

响应状态为状态 401(未经授权)。另一方面，在响应状态 400(错误请求)上，不会引发异常。

关于如何使其永不抛出异常有什么想法吗？

Answer 1

这里的问题是，您收到的异常没有被考虑在 ErrorHandler.. 处理的异常中。

查看 RestTemplate 的源代码。您将收到单独处理的 IOException。