package com.yuan.test; import java.util.ArrayList; import java.util.List; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; 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.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; public class CloseableTest { public static void main(String[] args) throws Exception { CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpGet httpGet = new HttpGet("http://*****.com/login.do"); CloseableHttpResponse response1 = httpclient.execute(httpGet); // The underlying HTTP connection is still held by the response object // to allow the response content to be streamed directly from the network socket. // In order to ensure correct deallocation of system resources // the user MUST call CloseableHttpResponse#close() from a finally clause. // Please note that if response content is not fully consumed the underlying // connection cannot be safely re-used and will be shut down and discarded // by the connection manager. try { System.out.println(response1.getStatusLine()); HttpEntity entity1 = response1.getEntity(); // do something useful with the response body // and ensure it is fully consumed EntityUtils.consume(entity1); } finally { response1.close(); } HttpPost httpPost = new HttpPost("http://*******/login.do"); List <NameValuePair> nvps = new ArrayList <NameValuePair>(); nvps.add(new BasicNameValuePair("username", "vip")); nvps.add(new BasicNameValuePair("password", "secret")); httpPost.setEntity(new UrlEncodedFormEntity(nvps));//添加參數 CloseableHttpResponse response2 = httpclient.execute(httpPost); try { System.out.println(response2.getStatusLine()); HttpEntity entity2 = response2.getEntity(); // do something useful with the response body // and ensure it is fully consumed EntityUtils.consume(entity2); } finally { response2.close(); } } finally { httpclient.close(); } } }
另外的一些說明能夠參考博文:java
http://blog.csdn.net/wangpeng047/article/details/19624529apache
使用HttpClient發送請求、接收響應很簡單,通常須要以下幾步便可。服務器
1. 建立HttpClient對象。socket
2. 建立請求方法的實例,並指定請求URL。若是須要發送GET請求,建立HttpGet對象;若是須要發送POST請求,建立HttpPost對象。spa
3. 若是須要發送請求參數,可調用HttpGet、HttpPost共同的setParams(HetpParams params)方法來添加請求參數;對於HttpPost對象而言,也可調用setEntity(HttpEntity entity)方法來設置請求參數。.net
4. 調用HttpClient對象的execute(HttpUriRequest request)發送請求,該方法返回一個HttpResponse。code
5. 調用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可獲取服務器的響應頭;調用HttpResponse的getEntity()方法可獲取HttpEntity對象,該對象包裝了服務器的響應內容。程序可經過該對象獲取服務器的響應內容。orm
6. 釋放鏈接。不管執行方法是否成功,都必須釋放鏈接對象