本文主要是介绍java.net.SocketException: No buffer space available (maximum connections reached?): connect，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
需求：类似于消息推送，在一定时间段内将固定数据发送给用户（用户量很大，抛开技术实现方面问题，只分析异常）
1.异常
[2020-10-28 17:44:03] [INFO] [com.eebbk.onlinelesson.common.util.HttpUtil] [284] - No buffer space available (maximum connections reached?): connect
java.net.SocketException: No buffer space available (maximum connections reached?): connectat java.net.DualStackPlainSocketImpl.connect0(Native Method)at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)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.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:121)at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:180)at org.apache.http.impl.conn.ManagedClientConnectionImpl.open(ManagedClientConnectionImpl.java:326)at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:605)at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:440)at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:835)at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:108)at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:56)at com.eebbk.onlinelesson.common.util.HttpUtil.doHttpGet(HttpUtil.java:264)at com.eebbk.onlinelesson.common.util.PushMsgUtil.pushMsgWithMachineId(PushMsgUtil.java:127)at com.eebbk.onlinelesson.Call.PushCall.call(PushCall.java:44)at com.eebbk.onlinelesson.Call.PushCall.call(PushCall.java:21)at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)at java.util.concurrent.FutureTask.run(FutureTask.java)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)
2.异常原因：是因为机器端口号用尽导致tcp无法申请新的端口去建立连接
代码
ExecutorService pool = new ThreadPoolExecutor(20, 20,0L, TimeUnit.MILLISECONDS,new LinkedBlockingQueue<Runnable>());try {List<String> list= liveTelecastService.getStatisticsByActivityKey(coursePackageId+"");list=new ArrayList<>();for (int i = 0; i <50000 ; i++) {list.add("700S520072701");}int pushSuccess=0;Message message = new Message(); //初始化计数器大小CountDownLatch latch=new CountDownLatch(list.size());List< Future<Boolean>> futureList=new ArrayList<>();for (String machineId:list) {PushCall pushCall = new PushCall(message,machineId,latch);Future<Boolean> future= pool.submit(pushCall);futureList.add(future);}//等待所有线程执行完成latch.await();for (Future<Boolean> future:futureList) {if(future.get()){pushSuccess++;}}
五万条数据，创建20个线程去请求接口获取数据，根据异常情况，查看代码，频繁new httpclient,每次都要重新建立tcp连接，完成3次握手和4次挥手。
2.修改为http连接池
@Slf4j
public class HttpClientUtils {// 客户端从服务端读取数据的超时时间private static final int HTTP_TIMEOUT = 2000;// 客户端与服务器建立连接的超时时间private static final int HTTP_CON_TIMEOUT = 200;// 客户端从连接池中获取连接的超时时间private static final int HTTP_CON_REQ_TIMEOUT = 1000;// 路由的默认最大连接private static final int HTTP_MAX_PERROUTE = 500;// 整个连接池连接的最大值private static final int HTTP_MAX_TOTAL = 1000;private static RequestConfig defaultRequestConfig = null;private static CloseableHttpClient httpClient = null;public static CloseableHttpClient getHttpClient(){if(null == httpClient){// 创建连接池管理器PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager();// 设置socket配置SocketConfig socketConfig = SocketConfig.custom().setTcpNoDelay(true).build();connManager.setDefaultSocketConfig(socketConfig);connManager.setMaxTotal(HTTP_MAX_TOTAL);connManager.setDefaultMaxPerRoute(HTTP_MAX_PERROUTE);// 设置获取连接超时时间、建立连接超时时间、从服务端读取数据的超时时间defaultRequestConfig = RequestConfig.custom().setSocketTimeout(HTTP_TIMEOUT).setConnectTimeout(HTTP_CON_TIMEOUT).setConnectionRequestTimeout(HTTP_CON_REQ_TIMEOUT).build();// 创建httpclient实例httpClient = HttpClients.custom().setConnectionManager(connManager).setDefaultRequestConfig(defaultRequestConfig).build();}return httpClient;}
}
代码
问题解决，不会出现上面的异常。
后记：上面问题解决了，但是由与并发高，又出现了响应超时问题，这个只要设置连接池的超时时间就好
- Read timed out
java.net.SocketTimeoutException: Read timed outat java.net.SocketInputStream.socketRead0(Native Method)at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)at java.net.SocketInputStream.read(SocketInputStream.java:171)at java.net.SocketInputStream.read(SocketInputStream.java:141)at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:137)at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:153)at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:280)at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:138)at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:56)at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259)at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163)at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:157)at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273)at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125)at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:272)at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)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:108)at com.eebbk.onlinelesson.common.util.HttpUtil.doHttpGet(HttpUtil.java:264)at com.eebbk.onlinelesson.common.util.PushMsgUtil.pushMsgWithMachineId(PushMsgUtil.java:127)at com.eebbk.onlinelesson.Call.PushCall.call(PushCall.java:44)at com.eebbk.onlinelesson.Call.PushCall.call(PushCall.java:21)at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)at java.util.concurrent.FutureTask.run(FutureTask.java)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)
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