HttpClient4.X发送带参数的Get请求

原地址：http://blog.csdn.net/zknxx/article/details/51598852

HttpClient 是apache 组织下面的一个用于处理HTTP 请求和响应的开源工具。所用jar包为httpclient-4.3.6.jar、httpcore-4.3.3.jar、httpmime-4.3.6.jar、commons-codec-1.6.jar。

发送Get请求代码如下：

 package com.zkn.newlearn.httpclient;

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.util.List;

 import org.apache.http.Consts;
 import org.apache.http.HttpEntity;
 import org.apache.http.NameValuePair;
 import org.apache.http.ParseException;
 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.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.apache.http.message.BasicNameValuePair;
 import org.apache.http.util.EntityUtils;

 import com.google.common.collect.Lists;

 public class HttpClientTest02 {

     public static void main(String[] args) {
         CloseableHttpClient httpClient = HttpClients.createDefault();
         CloseableHttpResponse response = null;
         InputStream is = null;
         String url = "http://localhost:8080/MyWebxTest/getCityByProvinceEname.do";
         //封装请求参数
         List params = Lists.newArrayList();
         params.add(new BasicNameValuePair("cityEname", "henan"));
         String str = "";
         try {
             //转换为键值对
             str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF_8));
             System.out.println(str);
             //创建Get请求
             HttpGet httpGet = new HttpGet(url+"?"+str);
             //执行Get请求，
             response = httpClient.execute(httpGet);
             //得到响应体
             HttpEntity entity = response.getEntity();
             if(entity != null){
                 is = entity.getContent();
                 //转换为字节输入流
                 BufferedReader br = new BufferedReader(new InputStreamReader(is, Consts.UTF_8));
                 String body = null;
                 while((body=br.readLine()) != null){
                     System.out.println(body);
                 }
             }
         } catch (ParseException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         } finally{
             //关闭输入流，释放资源
             if(is != null){
                 try {
                     is.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
             //消耗实体内容
             if(response != null){
                 try {
                     response.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
             //关闭相应 丢弃http连接
             if(httpClient != null){
                 try {
                     httpClient.close();
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }

     }
 }