Java httpClient连接池支持多线程高并发的实现

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 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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