前提：

今天在做jmeter压测某一个接口时，发现现象：

线程数=100个 循环次数=无限 持续时间30分钟

但是请求到40多个请求的时候 后面的请求的响应结果就出现了报错
报错—成功—又出现报错
中间有一个是成功 剩下后面的都是报错的 CPU也才升到6-7%

分为两个报错：
报错1：

java.net.SocketException: Socket closed
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
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.jmeter.protocol.http.sampler.HTTPHC4Impl.executeRequest(HTTPHC4Impl.java:850)
at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:561)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:67)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1282)
at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1271)
at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:627)
at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:551)
at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:490)
at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:257)
at java.lang.Thread.run(Unknown Source)

百度得知引起 java.net.SocketException: Socket closed 错误的原因通常是 未设置连接的超时时间。

解决方法：
该问题可以尝试通过以下方法解决。

如果在 HTTP Request Sampler 的 Basic 里勾选了Use KeepAlive，那么建议在 Advanced 页签下：

1、Implementation 选为 HttpClient4

2、Timeouts 中的 Connect 一般设置一个10~60秒的值，表示连接的空闲超时时间，避免由于没收到被压测端的响应回来的 Keep-Alive 的 Header 导致的连接断开

这个值的单位是毫秒：15s*1000=15000s

通过上述方法设置后，再次压测，还是会出现这个错误

再次百度，

https://cwiki.apache.org/confluence/display/jmeter/JMeterSocketClosed?spm=a2c4g.11186623.2.16.41ff41eaJzLjlR

将httpclient4.retrycount=0 改为 =1


参考链接：https://www.cnblogs.com/yiyaxuan/p/12673496.html