httpclientexception“org.apache.http.conn.ConnectionPoolTimeoutException：超时等待连接”
我正在尝试使用以下代码向我的服务器发送请求。 总是在第3次请求时失败了。
import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.HttpVersion; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.CoreConnectionPNames; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.json.JSONException; import org.json.JSONObject; import org.json.JSONTokener; public class HttpClientTest { private HttpClient client; public HttpClientTest() { HttpParams params = new BasicHttpParams(); params.setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 15000); params.setParameter(CoreConnectionPNames.SO_TIMEOUT, 15000); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, "utf-8"); HttpProtocolParams.setUseExpectContinue(params, true); ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(); cm.setMaxTotal(100); client = new DefaultHttpClient(cm, params); while (true) { HttpPost mPost = new HttpPost("http://myip/myservice"); JSONObject json = new JSONObject(); try { json.put("serialNumber", "abcd"); } catch (JSONException e1) { e1.printStackTrace(); } StringEntity s = null; try { s = new StringEntity(json.toString()); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } s.setContentEncoding("UTF-8"); s.setContentType("application/json"); mPost.setEntity(s); JSONObject response = null; System.out.println("HttpClientTest ---> send post"); HttpResponse mHttpResponse; try { mHttpResponse = client.execute(mPost); System.out.println("HttpClientTest ---> get response"); if(mHttpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK){ HttpEntity entity = mHttpResponse.getEntity(); ContentType contentType = ContentType.getOrDefault(entity); Charset charset = contentType.getCharset(); response = new JSONObject(new JSONTokener(new InputStreamReader(entity.getContent(), charset))); System.out.println("HttpClientTest ---> get result:" + response.toString()); } else { mPost.abort(); break; } } catch (Exception e) { e.printStackTrace(); } } } public static void main(String[] args) { HttpClientTest t = new HttpClientTest(); } } 例外情况如下：
org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting for connection at org.apache.http.impl.conn.tsccm.ConnPoolByRoute.getEntryBlocking(ConnPoolByRoute.java:417) at org.apache.http.impl.conn.tsccm.ConnPoolByRoute$1.getPoolEntry(ConnPoolByRoute.java:300) at org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager$1.getConnection(ThreadSafeClientConnManager.java:224) at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:401) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:754) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:732) at com.i360r.client.takeaway.network.HttpClientTest.(HttpClientTest.java:68) at com.i360r.client.takeaway.network.HttpClientTest.main(HttpClientTest.java:88)
我有同样的问题，我找到了解决方案。 此超时是因为连接泄漏。 在我的情况下，我使用httpDelete方法，而不是消耗响应。 而是检查响应的状态。
修复方法是，需要使用响应实体。 为了确保正确释放系统资源，必须关闭与该实体关联的内容流。
所以我使用了EntityUtils.consumeQuietly(response.getEntity()); 这确保了实体内容被完全消耗，并且内容流（如果存在）被关闭。
我修好了！ 在finally块中添加mPost.releaseConnection() 。
try { } catch (Exception e) { } finally { mPost.releaseConnection(); }
请将包org.apache.httpcomponents更新到4.2.1
如果您使用ApacheHttpClient和DropWizard 0.6.2，后台创建一个具有默认配置的MultiThreadedHttpConnectionManager ，这种情况也会发生 – 而且默认配置一次只允许2个并发的http连接。
因此，使用此配置，如果您的服务器被淹没并且始终向同一主机发出请求，那么您一次只允许运行最多2个连接！
只需将您获得响应的行放在try-with-resources中，并使用CloseableHttpResponse而不是HttpResponse，如下所示：
try(final CloseableHttpResponse mHttpResponse = client.execute(mPost);) { System.out.println("HttpClientTest ---> get response"); ....remainder code
mHttpResponse对象将自动使用并为您关闭
希望这可以帮助！