在java後臺開發中，我們有時候需要調用其他網站的接口進行數據的獲取操作，我們一般會采用

　　1.java net 包中的URL 類，進行網絡的數據獲取

　　2.使用apache提供的HttpClient進行網絡中數據的獲取;

這裏我們使用第二種方式，使用apache 提供的HttpClient進行數據的獲取，接口的對接，下面附上HttpClientUtil 工具類，實現了POST與GET方法

package com.project.util;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
 
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
 
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;



public class HttpClientUtil {
    
    
    
    
    //使用HttpClient 進行doGET請求
        public static String doGet(String url) {
            
            
            String result =null;
            //DefaultHttpClient httpclient =new DefaultHttpClient();
 
//老版本的方法
            CloseableHttpClient httpclient =HttpClients.createDefault();
            HttpGet httpget =new HttpGet(url);
            try {
                HttpResponse response=httpclient.execute(httpget);
                HttpEntity entity=response.getEntity();
                if(entity !=null) {
                     result =EntityUtils.toString(entity,"UTF-8");
                        
                }
                
                
            } catch (Exception e) {
                
                e.printStackTrace();
            } 
            finally {
                
                try {
                    
                if(httpclient !=null) {
                    
                        httpclient.close();
                    }
                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            return result;
            
            
        
        }
        
        
        
        public static void main(String[] args) {
            
            String str=doGet("http://www.baidu.com");
            System.out.println(str);
            
            
        }
        
        
        
        
        
        //使用HttpClient 進行dopOSTT請求,適合發送的數據為json數據格式
            public static String doPOST(String url,String outstr) {
                
                
                //DefaultHttpClient httpclient =new DefaultHttpClient();//老版本的方法
                CloseableHttpClient httpclient =HttpClients.createDefault();
                HttpPost httppost =new HttpPost(url);
                String result =null;
                try {
                    httppost.setEntity(new StringEntity(outstr, "UTF-8"));
                    HttpResponse response=httpclient.execute(httppost);
                    HttpEntity entity=response.getEntity();
                    if(entity !=null) {
                         result =EntityUtils.toString(entity,"UTF-8");
                        
                    }
                    
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } 
                finally {
                    
                    try {
                        
                    if(httpclient !=null) {
                        
                            httpclient.close();
                        }
                    } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                return result;
            }
            
        

}

HttpClient--使用HttpClient進行Get Post請求訪問