Java httpClient连接池支持多线程高并发的实现
本文主要介绍了Java httpClient连接池支持多线程高并发的实现，文中通过示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下当采用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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原文链接：https://blog.csdn.net/qzqanzc/article/details/84344655
http://www.zzvips.com/article/208919.html
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