1、案例http请求代码如下：
import org.apache.http.client.CookieStore;import org.apache.http.client.config.RequestConfig;import org.apache.http.client.entity.UrlEncodedFormEntity;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; public static String postBody(String url, String body, Map<String, String> headMap) throws Exception {CloseableHttpClient httpClient = HttpClients.createDefault();HttpPost request = new HttpPost(url);// 配置超时RequestConfig.Builder customReqConf = RequestConfig.custom();customReqConf.setConnectTimeout(5000); //连接超时时间customReqConf.setSocketTimeout(100000);//数据传输的超时时间customReqConf.setConnectionRequestTimeout(5000); //从连接池中取的连接的最长时间request.setConfig(customReqConf.build());CloseableHttpResponse response = null;HttpEntity httpEntity = null;try {request.setHeader("Content-Type", "application/json");if (headMap != null && headMap.size() > 0) {Iterator<String> it = headMap.keySet().iterator();while (it.hasNext()) {String headKey = it.next();request.addHeader(headKey, headMap.get(headKey));}}if (body != null) {StringEntity se = new StringEntity(body, "GBK");request.setEntity(se);}response = httpClient.execute(request);//获得状态码httpEntity = response.getEntity();return EntityUtils.toString(httpEntity);} catch (Exception e) {throw e;} finally {if (httpEntity != null) {EntityUtils.consume(httpEntity);}if (response != null) {response.close();}httpClient.close();}}
这里我们设置了三个超时链接时间。（单位：毫秒）
customReqConf.setConnectTimeout(5000); //连接超时时间
customReqConf.setSocketTimeout(100000); //数据传输的超时时间
customReqConf.setConnectionRequestTimeout(5000); //从连接
对于一般的http请求来说，
设置connectTimeout，与目标url的链接超时时间。超时后会ConnectionTimeOutException。
设置SocketTimeout，是目标链接和当前服务地址数据传输的超时时间，超出后会抛出SocketTimeOutException。为了防止一些耗时响应的操作，可以将这个时间设置的大一些。如果很耗时，可以不设置这个参数，会一直等待数据传输完成。
设置ConnectionRequestTimeout，连接池获取连接的超时时间，如果连接池里连接都被用了，且超过设定时间,就会报错connectionrequesttimeout。
学海无涯苦作舟！！！
