Apache HttpComponents HttpClient超时

Question

如何在httpcomponents httpclient中设置连接超时？ 我在http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html找到了文档，但不清楚这些参数是如何实际设置的。

此外， SO_TIMEOUT和CONNECTION_TIMEOUT之间的差异的解释将是有帮助的。

Answer 1

在Apache Http Client的4.3版中，配置被重构（再次）。 新方式如下：

RequestConfig.Builder requestBuilder = RequestConfig.custom();
requestBuilder.setConnectTimeout(timeout);
requestBuilder.setConnectionRequestTimeout(timeout);

HttpClientBuilder builder = HttpClientBuilder.create();     
builder.setDefaultRequestConfig(requestBuilder.build());
HttpClient client = builder.build();

Answer 2

在HttpClient 4.3版本中，您可以使用以下示例..让我们说5秒钟

int timeout = 5;
RequestConfig config = RequestConfig.custom()
  .setConnectTimeout(timeout * 1000)
  .setConnectionRequestTimeout(timeout * 1000)
  .setSocketTimeout(timeout * 1000).build();
CloseableHttpClient client = 
  HttpClientBuilder.create().setDefaultRequestConfig(config).build();
HttpGet request = new HttpGet("http://localhost:8080/service"); // GET Request
response = client.execute(request);

Answer 3

来自@jontro的答案是正确的，但是如果有一个代码片段就可以做到这一点总是很好的。 有两种方法可以做到这一点：

版本1：为每个参数设置10秒超时：

HttpClient httpclient = new DefaultHttpClient();
// this one causes a timeout if a connection is established but there is 
// no response within 10 seconds
httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 10 * 1000);

// this one causes a timeout if no connection is established within 10 seconds
httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 10 * 1000);

// now do the execute:
HttpGet httpget = new HttpGet(URL);
HttpResponse response = httpclient.execute(httpget);

版本2：还为每个参数设置10秒超时：

HttpParams params = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(params, 10 * 1000);
HttpConnectionParams.setSoTimeout(params, 10 * 1000);

HttpClient httpclient = new DefaultHttpClient(params);
HttpGet httpget = new HttpGet(URL);
HttpResponse response = httpclient.execute(httpget);

Answer 4

在2.5节中，您将看到如何设置CONNECTION_TIMEOUT参数的示例。

CONNECTION_TIMEOUT是等待初始连接的时间，SO_TIMEOUT是在建立连接后读取数据包时等待的超时。

Answer 5

我为整个请求设置了一个硬超时，以解决java.net.SocketInputStream.socketRead0问题。

private static final ScheduledExecutorService SCHEDULED_EXECUTOR = Executors.newSingleThreadScheduledExecutor()

HttpGet request = new HttpGet("http://www.example.com")
final Runnable delayedTask = new Runnable() {
    @Override
    public void run() {
        request.abort()
    }
}
SCHEDULED_EXECUTOR.schedule(delayedTask, 100000, TimeUnit.MILLISECONDS)