最近项目中需要调用第三方平台的rest API，需要用到httpClient来发送http请求。简单封装了一个工具类。
下来具体说一下httpClient的使用首先得需要依赖 httpcore-4.4.3.jar和httpclient-4.5.1.jar，如果需要发送异步请求还需要httpasyncclient-4.1.1.jar和httpcore-nio-4.4.4.jar获取方法网上有很多 官方现在地址http://hc.apache.org/downloads.cgi，我使用的httpclient-4.5.1.jar。
1.使用httpclient 发送Get和Post请求 //get 请求 CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpGet httpGet = new HttpGet("http://www.baidu.com"); System.out.println("Executing get request " + httpGet.getURI()); CloseableHttpResponse response = httpclient.execute(httpGet); try { System.out.println(response.getStatusLine()); //返回请求的响应码 httpGet.abort(); } finally { response.close(); } } finally { httpclient.close(); } //Post 请求 CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpPost httpPost = new HttpPost("http://www.baidu.com"); List pairList = new ArrayList (); pairList.add(new BasicNameValuePair("参数名","参数值")); System.out.println("Executing get request " + httpPost.getURI()); CloseableHttpResponse response = httpclient.execute(httpPost); try { System.out.println(response.getStatusLine()); //返回请求的响应码 httpPost.abort(); } finally { response.close(); } } finally { httpclient.close(); }