我使用Spring Boot并在保持与第三方REST服务的长期连接的同时面临以下问题：
org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:5000/products/10": localhost:5000 failed to respond; nested exception is org.apache.http.NoHttpResponseException: localhost:5000 failed to respond
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:732)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:680)
at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:435)
at com.example.pipeline.domain.service.nlp.NLPService.getDocumentsInfoNew(NLPService.java:42)
at com.example.pipeline.domain.batch.steps.NLPTasklet.execute(NLPTasklet.java:170)
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:406)
at org.springframework.batch.core.step.tasklet.TaskletStep$ChunkTransactionCallback.doInTransaction(TaskletStep.java:330)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
at org.springframework.batch.core.step.tasklet.TaskletStep$2.doInChunkContext(TaskletStep.java:272)
at org.springframework.batch.core.scope.context.StepContextRepeatCallback.doInIteration(StepContextRepeatCallback.java:81)
at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:375)
at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:215)
at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:145)
at org.springframework.batch.core.step.tasklet.TaskletStep.doExecute(TaskletStep.java:257)
at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:200)
at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148)
at org.springframework.batch.core.job.AbstractJob.handleStep(AbstractJob.java:394)
at org.springframework.batch.core.job.SimpleJob.doExecute(SimpleJob.java:135)
at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:308)
at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:141)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.http.NoHttpResponseException: localhost:5000 failed to respond
at org.apache.http.impl.conn.DefaultHttpRespons
此服务可以将连接保持一小时或更长时间，然后才能返回结果。
我的RestTemplate配置如下：
public static RestTemplate createRestTemplate(int connectionTimeoutMs, int readTimeoutMs, ObjectMapper objectMapper) {
HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory(HttpClients.createDefault());
httpRequestFactory.setConnectTimeout(connectionTimeoutMs);
httpRequestFactory.setReadTimeout(readTimeoutMs);
RestTemplate restTemplate = new RestTemplate(httpRequestFactory);
List<ClientHttpRequestInterceptor> interceptors = new ArrayList<ClientHttpRequestInterceptor>();
interceptors.add(new LoggingRequestInterceptor());
restTemplate.setInterceptors(interceptors);
restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(httpRequestFactory));
MappingJackson2HttpMessageConverter messageConverter = restTemplate.getMessageConverters().stream().filter(MappingJackson2HttpMessageConverter.class::isInstance)
.map(MappingJackson2HttpMessageConverter.class::cast).findFirst().orElseThrow(() -> new RuntimeException("MappingJackson2HttpMessageConverter not found"));
messageConverter.setObjectMapper(objectMapper);
restTemplate.getMessageConverters().stream().filter(StringHttpMessageConverter.class::isInstance).map(StringHttpMessageConverter.class::cast).forEach(a -> {
a.setWriteAcceptCharset(false);
a.setDefaultCharset(StandardCharsets.UTF_8);
});
return restTemplate;
}
}
RestTemplate restTemplate = HttpUtils.createRestTemplate(60 * 1000, 3 * 60 * 60 * 1000, objectMapper);
我可以做些什么来解决它吗？或者这是http://localhost:5000服务方面的纯粹问题，应该在此处解决吗？
答案 0 :(得分：3)
最后，我想到了以下RestTempleat配置：
public class HttpUtils {
static final Logger LOGGER = LoggerFactory.getLogger(HttpUtils.class);
private static final int HTTP_CLIENT_RETRY_COUNT = 3;
private static final int MAXIMUM_TOTAL_CONNECTION = 10;
private static final int MAXIMUM_CONNECTION_PER_ROUTE = 5;
private static final int CONNECTION_VALIDATE_AFTER_INACTIVITY_MS = 10 * 1000;
public static RestTemplate createRestTemplate(int connectionTimeoutMs, int readTimeoutMs, ObjectMapper objectMapper) {
HttpClientBuilder clientBuilder = HttpClients.custom();
PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
// Set the maximum number of total open connections.
connectionManager.setMaxTotal(MAXIMUM_TOTAL_CONNECTION);
// Set the maximum number of concurrent connections per route, which is 2 by default.
connectionManager.setDefaultMaxPerRoute(MAXIMUM_CONNECTION_PER_ROUTE);
connectionManager.setValidateAfterInactivity(CONNECTION_VALIDATE_AFTER_INACTIVITY_MS);
clientBuilder.setConnectionManager(connectionManager);
clientBuilder.setRetryHandler(new DefaultHttpRequestRetryHandler(HTTP_CLIENT_RETRY_COUNT, true, new ArrayList<>()) {
@Override
public boolean retryRequest(IOException exception, int executionCount, HttpContext context) {
LOGGER.info("Retry request, execution count: {}, exception: {}", executionCount, exception);
return super.retryRequest(exception, executionCount, context);
}
});
HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory(clientBuilder.build());
httpRequestFactory.setConnectTimeout(connectionTimeoutMs);
httpRequestFactory.setConnectionRequestTimeout(readTimeoutMs);
httpRequestFactory.setReadTimeout(readTimeoutMs);
RestTemplate restTemplate = new RestTemplate(httpRequestFactory);
List<ClientHttpRequestInterceptor> interceptors = new ArrayList<ClientHttpRequestInterceptor>();
interceptors.add(new LoggingRequestInterceptor());
restTemplate.setInterceptors(interceptors);
restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(httpRequestFactory));
MappingJackson2HttpMessageConverter messageConverter = restTemplate.getMessageConverters().stream().filter(MappingJackson2HttpMessageConverter.class::isInstance)
.map(MappingJackson2HttpMessageConverter.class::cast).findFirst().orElseThrow(() -> new RuntimeException("MappingJackson2HttpMessageConverter not found"));
messageConverter.setObjectMapper(objectMapper);
restTemplate.getMessageConverters().stream().filter(StringHttpMessageConverter.class::isInstance).map(StringHttpMessageConverter.class::cast).forEach(a -> {
a.setWriteAcceptCharset(false);
a.setDefaultCharset(StandardCharsets.UTF_8);
});
return restTemplate;
}
}
public class LoggingRequestInterceptor implements ClientHttpRequestInterceptor {
private static final 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("Headers : {}", request.getHeaders());
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("Headers : {}", response.getHeaders());
LOGGER.debug("Response body: {}", inputStringBuilder.toString());
LOGGER.debug("=======================response end=================================================");
}
}