在java后台开发中，我们有时候需要调用其他网站的接口进行数据的获取操作，我们一般会采用
1.java net 包中的URL 类，进行网络的数据获取
2.使用apache提供的HttpClient进行网络中数据的获取;
这里我们使用第二种方式，使用apache 提供的HttpClient进行数据的获取，接口的对接，下面附上HttpClientUtil 工具类，实现了POST与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 进行doGET请求 ???????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 进行dopOSTT请求,适合发送的数据为json数据格式 ???????????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进行Get Post请求访问
原文地址：https://www.cnblogs.com/iscys/p/9502601.html