Java|Java httpClient连接池支持多线程高并发的实现 JavahttpClient连接池支持多线程高

当采用HttpClient httpClient = HttpClients.createDefault() 实例化的时候。会导致Address already in use的异常。

信息: I/O exception (java.net.BindException) caught when processing request to {}->http://**.**.**.** Address already in use: connect
十一月 22, 2018 5:02:13 下午 org.apache.http.impl.execchain.RetryExec execute
信息: Retrying request to {}->http://**.**.**.**
java.net.BindException: Address already in use: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
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)

采用连接池来创建httpClient 解决了这个问题，避免资源一直占用不释放的问题。

import org.apache.http.HttpEntity; import org.apache.http.HttpEntityEnclosingRequest; import org.apache.http.HttpRequest; import org.apache.http.NoHttpResponseException; import org.apache.http.client.HttpRequestRetryHandler; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.protocol.HttpClientContext; import org.apache.http.conn.ConnectTimeoutException; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; import org.apache.http.protocol.HttpContext; import org.apache.http.util.EntityUtils; import java.io.IOException; import java.io.InterruptedIOException; import java.net.UnknownHostException; import java.util.HashMap; import java.util.Map; public class WebTools { public static String KEY_STATUS_CODE = "statusCode"; public static String KEY_CONTENT = "content"; private final static PoolingHttpClientConnectionManager poolConnManager = new PoolingHttpClientConnectionManager(); //连接池管理器private final static HttpRequestRetryHandler httpRequestRetryHandler = new HttpRequestRetryHandler() {//retry handlerpublic boolean retryRequest(IOException exception,int executionCount, HttpContext context) {if (executionCount >= 5) {return false; }if (exception instanceof NoHttpResponseException) {return true; }if (exception instanceof InterruptedIOException) {return false; }if (exception instanceof UnknownHostException) {return false; }if (exception instanceof ConnectTimeoutException) {return false; }HttpClientContext clientContext = HttpClientContext.adapt(context); HttpRequest request = clientContext.getRequest(); if (!(request instanceof HttpEntityEnclosingRequest)) {return true; }return false; }}; static {//类加载的时候设置最大连接数和每个路由的最大连接数poolConnManager.setMaxTotal(2000); poolConnManager.setDefaultMaxPerRoute(1000); } /*** ########################### core code#######################* @return*/private static CloseableHttpClient getCloseableHttpClient() {CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(poolConnManager).setRetryHandler(httpRequestRetryHandler).build(); return httpClient; } /*** buildResultMap** @param response* @param entity* @return* @throws IOException*/private static Map buildResultMap(CloseableHttpResponse response, HttpEntity entity) throwsIOException {Map result; result = new HashMap<>(2); result.put(KEY_STATUS_CODE, response.getStatusLine().getStatusCode()); //status codeif (entity != null) {result.put(KEY_CONTENT, EntityUtils.toString(entity, "UTF-8")); //message content}return result; } /*** send json by post method** @param url* @param message* @return* @throws Exception*/public static Map postJson(String url, String message) { Map result = null; CloseableHttpClient httpClient = getCloseableHttpClient(); HttpPost httpPost = new HttpPost(url); CloseableHttpResponse response = null; try { httpPost.setHeader("Accept", "application/json; charset=UTF-8"); httpPost.setHeader("Content-Type", "application/json"); StringEntity stringEntity = new StringEntity(message); stringEntity.setContentType("application/json; charset=UTF-8"); httpPost.setEntity(stringEntity); response = httpClient.execute(httpPost); HttpEntity entity = response.getEntity(); result = buildResultMap(response, entity); } catch (Exception e) {e.printStackTrace(); } finally {if (response != null) {try {EntityUtils.consume(response.getEntity()); response.close(); } catch (IOException e) {e.printStackTrace(); }}}return result; }}

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