大家好，又见面了，我是你们的朋友全栈君。
httpComponents HttpClient4.x
获取httpClient
CloseableHttpClient httpClient = HttpClients.custom()
.setMaxConnTotal(config.maxConnTotal)
.setMaxConnPerRoute(config.maxConnPerRoute)
.setDefaultRequestConfig(requestConfig);或者
PoolingHttpClientConnectionManager connectionManager = new PoolingHttpClientConnectionManager();
connectionManager.setMaxTotal(maxTotal);
connectionManager.setDefaultMaxPerRoute(defaultMaxPerRoute);
//可用空闲连接过期时间,重用空闲连接时会先检查是否空闲时间超过这个时间，如果超过，释放socket重新建
connectionManager.setValidateAfterInactivity(validateAfterInactivity);
CloseableHttpClient httpClient = HttpClients.custom()
.setConnectionManager(connectionManager)
.setRetryHandler(new DefaultHttpRequestRetryHandler())
.build();获取httpRequestBase
RequestConfig requestConfig = RequestConfig.custom()
.setConnectionRequestTimeout(config.connReqTimeout)
.setConnectTimeout(config.connTimeout)
.setSocketTimeout(config.socketTimeout)
.build();
HttpRequestBase httpRequestBase = new HttpGet/HttpPost/HttpDelete(url);
httpRequestBase.setConfig(requestConfig);
httpRequestBase.setxxx();调用
CloseableHttpResponse response = httpClient.execute(httpRequestBase);
关闭
response.close();
HttpClient HttpClient3.x
获取HttpClient
MultiThreadedHttpConnectionManager httpConnectionManager = new MultiThreadedHttpConnectionManager();
httpConnectionManager.getParams().setDefaultMaxConnectionsPerHost(maxConnectionsPerHost);
httpConnectionManager.getParams().setMaxTotalConnections(maxTotalConnections);
//4.x版本提供connectionManager.setValidateAfterInactivity(validateAfterInactivity);
httpConnectionManager.getParams().setStaleCheckingEnabled(false/true);
httpConnectionManager.getParams().setLinger(linger);
httpConnectionManager.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
httpConnectionManager.getParams().setConnectionTimeout(connectionTimeout);
httpConnectionManager.getParams().setSoTimeout(soTimeout);
HttpClient httpClient = new HttpClient(httpConnectionManager);获取method
EntityEnclosingMethod method = new PostMethod(url);
method.setxxx();调用
client.executeMethod(method);
关闭
method.releaseConnection();
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