我的 Java 程序向服务器发送一千个 URL 并尝试获取结果。我开始得到这个结果。如何解决这个问题？
代码在这个问题Why does the following executor service java Thread program doesn't shut down?中给出
Aug 17, 2014 2:09:40 AM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.net.SocketException) caught when processing request to {}->MyURL:80: Connection reset
Aug 17, 2014 2:09:40 AM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->MyURL:80
org.apache.http.conn.HttpHostConnectException: Connect to MyAnotherURL:80 [MyAnotherURL/115.249.106.144] failed: Operation timed out
at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:140)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:318)
at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363)
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219)
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86)
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
at MyProgram$MyRunnable.run(MyProgram.java:224)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)
Caused by: java.net.ConnectException: Operation timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:382)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:241)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:228)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:431)
at java.net.Socket.connect(Socket.java:527)
at org.apache.http.conn.socket.PlainConnectionSocketFactory.connectSocket(PlainConnectionSocketFactory.java:72)
at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:123)
... 14 more
Aug 17, 2014 2:10:14 AM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.net.SocketException) caught when processing request to {}->MyURL:80: Connection reset
Exception in thread "pool-1-thread-302" java.lang.NullPointerException
at MyProgram$MyRunnable.run(MyProgram.java:243)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)
Aug 17, 2014 2:10:14 AM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->MyURL:80
Aug 17, 2014 2:10:14 AM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.net.SocketException) caught when processing request to {}->MyURL:80: Connection reset
Aug 17, 2014 2:10:14 AM org.apache.http.impl.execchain.RetryExec execute
INFO: Retrying request to {}->MyURL:80
Aug 17, 2014 2:10:14 AM org.apache.http.impl.execchain.RetryExec execute
INFO: I/O exception (java.net.SocketException) caught when processing request to {}->MyURL:80: Connection reset
Aug 17, 2014 2:10:14 AM org.apache.http.impl.execchain.RetryExec execute
最佳答案
您遇到重置和超时，因此网络服务器似乎没有监听传入连接。
自从您写道您“开始”收到此消息以来，我假设您至少收到了一些请求的响应，因此网络服务器已启动并且可以访问。可能是某种 DoS 保护阻止了尝试建立过多连接的客户端。在这种情况下，如果您不控制 Web 服务器，唯一的解决方案就是减少连接数。
关于java - 如何解决 "Connect: operation timed out"和 "RetryExec"错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25347864/