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。
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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 handler public 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<String, Object> buildResultMap(CloseableHttpResponse response, HttpEntity entity) throws IOException { Map<String, Object> result; result = new HashMap<>(2); result.put(KEY_STATUS_CODE, response.getStatusLine().getStatusCode()); //status code if (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<String, Object> postJson(String url, String message) { Map<String, Object> 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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原文链接：https://blog.csdn.net/qzqanzc/article/details/84344655
