httpclient: 设置连接池及超时配置，请求数据:PoolingHttpClientConnectionManager

public static void main(String[] args) throws Exception{
		//httpclient连接池

		//创建连接池
		PoolingHttpClientConnectionManager cManager = new PoolingHttpClientConnectionManager();
		//设置最大连接数
		cManager.setMaxTotal(50);
		//设置每个主机地址的并发数
		cManager.setDefaultMaxPerRoute(20);

		//执行i请求
		doGet(cManager);
	}

	private static void doGet(PoolingHttpClientConnectionManager cm) throws Exception{
		//从连接池获取连接,每次不一样
		CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(cm).build();
		//设置http get
		HttpGet httpGet = new HttpGet("https://www.baidu.com");
		//设置请求参数
		RequestConfig config = RequestConfig.custom().setConnectTimeout(5000) //连接超时时间
				.setConnectionRequestTimeout(500) //从线程池中获取线程超时时间
				.setSocketTimeout(8000) //设置数据超时时间
				.setStaleConnectionCheckEnabled(true) //提交请求前检查连接是否可用
				.build();

		httpGet.setConfig(config);

		//返回数据
		CloseableHttpResponse response = null;

		try {
			response = httpClient.execute(httpGet);
			String con = EntityUtils.toString(response.getEntity(), "utf-8");
			System.out.println(con);
		}finally{
			if(response!=null){
				response.close();
			}
			httpClient.close();
		}

	}