多线程下httpClient报错 Connection pool shut down

报错信息

1、报错信息：Connection pool shut down

java.lang.IllegalStateException: Connection pool shut downat org.apache.http.util.Asserts.check(Asserts.java:34)at org.apache.http.pool.AbstractConnPool.lease(AbstractConnPool.java:191)at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.requestConnection(PoolingHttpClientConnectionManager.java:251)at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:175)at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)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:107)at com.youzidata.speech.util.HttpClientUtil.requestOCRForHttp(HttpClientUtil.java:54)at com.youzidata.speech.task.RowBackThread.run(RowBackThread.java:79)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at java.lang.Thread.run(Thread.java:745)

解决方法

HttpClients.custom().setConnectionManagerShared(true).setSSLSocketFactory(sslsf).build();

通过设置setConnectionManagerShared(true)解决了“Connection pool shut down”的问题

PoolingHttpClientConnectionManager pccm = newPoolingHttpClientConnectionManager();pccm.setMaxTotal(1000); // 连接池最大并发连接数pccm.setDefaultMaxPerRoute(1000);// 单路由最大并发数return HttpClients.custom().setConnectionManager(pccm).setConnectionManagerShared(true).setSSLSocketFactory(sslsf).build();

apache 官方的建议是，创建连接池，并为每一个接口URL分配一个线程，去执行，还给出了许多高并发访问的编码技巧

参考

原文：https://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html
参考网址：
1、http://www.mamicode.com/info-detail-2297359.html
2、https://blog.csdn.net/iq105/article/details/75355831
3、https://blog.csdn.net/ystyaoshengting/article/details/49098949?utm_medium=distribute.pc_relevant.none-task-blog-baidujs_title-3&spm=1001.2101.3001.4242
4、https://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html