HttpClient 4.3与4.3版本以下版本 close 比较

网上利用java发送http请求的代码很多，一搜一大把，有的利用的是java.net.*下的HttpURLConnection，有的用httpclient，而且发送的代码也分门别类。今天我们主要来说的是利用httpclient发送请求。

httpclient又可分为

• httpclient3.x
• httpclient4.x到httpclient4.3以下
• httpclient4.3以上

不同httpclient版本其请求发送的方式也不一样，下面来做个归纳

 

httpclient3.x

 HttpClient client = new HttpClient();
 // 设置代理服务器地址和端口
 // client.getHostConfiguration().setProxy("proxy_host_addr",proxy_port);
 // 使用 GET 方法 ，如果服务器需要通过 HTTPS 连接，那只需要将下面 URL 中的 http 换成 https
 HttpMethodmethod = new GetMethod("http://java.sun.com");
 // 使用POST方法
 // HttpMethod method = new PostMethod("http://java.sun.com");
 client.executeMethod(method);
 // 打印服务器返回的状态
 System.out.println(method.getStatusLine());
 // 打印返回的信息
 System.out.println(method.getResponseBodyAsString());
 // 释放连接
 method.releaseConnection();

 

 

httpclient4.x到httpclient4.3以下

 

 public void getUrl(String url, String encoding) throws ClientProtocolException, IOException {
         HttpClient client = new DefaultHttpClient();
         HttpGet get = new HttpGet(url);
                 //设置超时时间
                 HttpParams params = client.getParams();
                 HttpConnectionParams.setConnectionTimeout(params, (int) 10 * 1000);
                 HttpConnectionParams.setSoTimeout(params, 10 * 1000);
         HttpResponse response = client.execute(get);
         HttpEntity entity = response.getEntity();
         if (entity != null) {
             InputStream instream = entity.getContent();
             try {
                 BufferedReader reader = new BufferedReader(new InputStreamReader(instream, encoding));
                 System.out.println(reader.readLine());
             } catch (Exception e) {
                 e.printStackTrace();
             } finally {
                 instream.close();
             }
         }
         // 关闭连接.
         client.getConnectionManager().shutdown();
     }

 

 

 

httpclient4.3以上

 

 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.apache.http.util.EntityUtils;


 public static String getResult(String urlStr) {
         CloseableHttpClient httpClient = HttpClients.createDefault();
         // HTTP Get请求
         HttpGet httpGet = new HttpGet(urlStr);
         // 设置请求和传输超时时间
         // RequestConfig requestConfig =
         // RequestConfig.custom().setSocketTimeout(TIME_OUT).setConnectTimeout(TIME_OUT).build();
         // httpGet.setConfig(requestConfig);
         String res = "";
         try {
             // 执行请求
             HttpResponse getAddrResp = httpClient.execute(httpGet);
             HttpEntity entity = getAddrResp.getEntity();
             if (entity != null) {
                 res = EntityUtils.toString(entity);
             }
             log.info("响应" + getAddrResp.getStatusLine());
         } catch (Exception e) {
             log.error(e.getMessage(), e);
             return res;
         } finally {
             try {
                 httpClient.close();
             } catch (IOException e) {
                 log.error(e.getMessage(), e);
                 return res;
             }
         }
         return res;
     }