HttpClient 请求

import org.apache.http.Consts;
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;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * Http请求工具类
 * 

 *     GET请求、POST请求操作
 * 
 * @author D.Yang
 *         Created by D.Yang on 2017/11/14 0014.
 */
public class HttpClientUtils {
    /**
     * GET 请求
     * @param url      请求地址
     * @param map      请求参数
     * @param encoding 请求编码
     * @return
     */
    public static String get(String url, Map
 
   map, String encoding) {
        /* 创建HttpClient 对象 */
        CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
        CloseableHttpResponse closeableHttpResponse = null;
        /* 创建返回数据 */
        String result = null;
        try {
            /* 装填请求参数 */
            List
  
    nameValuePairList = new ArrayList<>(); if (map != null) { /* 遍历请求参数封装 */ for (Map.Entry
   
     enrty : map.entrySet()) { nameValuePairList.add(new BasicNameValuePair(enrty.getKey(), enrty.getValue())); } } /* 转换为键值对 */ String parameterValue = EntityUtils.toString(new UrlEncodedFormEntity(nameValuePairList, Consts.UTF_8)); /* 创建Get请求对象 */ HttpGet httpGet = new HttpGet(url + "?" + parameterValue); /* 执行Get请求操作 */ closeableHttpResponse = closeableHttpClient.execute(httpGet); /* 获取请求响应数据 */ HttpEntity httpEntity = closeableHttpResponse.getEntity(); if (httpEntity != null) { /* 获取的值转换为键值对 */ result = EntityUtils.toString(httpEntity, encoding); } /* 关闭 输入流、释放资源 */ EntityUtils.consume(httpEntity); } catch (IOException e) { e.printStackTrace(); } finally { /* 关闭实体内容 */ if (closeableHttpResponse != null) { try { closeableHttpResponse.close(); } catch (IOException e) { e.printStackTrace(); } } /* 关闭相应的HttpClient 连接 */ if (closeableHttpClient != null) { try { closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); } } } return result; } /** * GET 缺省请求 * @param url 请求地址 * @return */ public static String get(String url) { return get(url, null, "UTF-8"); } /** * GET 请求 * @param url 请求地址 * @param map 请求参数 * @return */ public static String get(String url, Map
    
      map) { return get(url, map, "UTF-8"); } /** * POST 请求 * @param url 请求地址 * @param map 请求参数 * @param encoding 请求编码 * @return */ public static String post(String url,Map
     
       map,String encoding){ /* 创建HttpClient 对象 */ CloseableHttpClient closeableHttpClient = HttpClients.createDefault(); CloseableHttpResponse closeableHttpResponse = null; /* 创建返回数据 */ String result = null; try { /* 装填请求参数 */ List
      
        nameValuePairList = new ArrayList<>(); if (map != null) { /* 遍历请求参数封装 */ for (Map.Entry
       
         enrty : map.entrySet()) { nameValuePairList.add(new BasicNameValuePair(enrty.getKey(), enrty.getValue())); } } /* 创建Post请求对象 */ HttpPost httpPost = new HttpPost(url); /* 设置参数到请求对象中去 */ httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairList)); /* 执行Post请求操作 */ closeableHttpResponse = closeableHttpClient.execute(httpPost); /* 获取请求响应数据 */ HttpEntity httpEntity = closeableHttpResponse.getEntity(); if (httpEntity != null) { /* 获取的值转换为键值对 */ result = EntityUtils.toString(httpEntity, encoding); } /* 关闭 输入流、释放资源 */ EntityUtils.consume(httpEntity); } catch (IOException e) { e.printStackTrace(); } finally { /* 关闭实体内容 */ if (closeableHttpResponse != null) { try { closeableHttpResponse.close(); } catch (IOException e) { e.printStackTrace(); } } /* 关闭相应的HttpClient 连接 */ if (closeableHttpClient != null) { try { closeableHttpClient.close(); } catch (IOException e) { e.printStackTrace(); } } } return result; } /** * POST 缺省请求 * @param url 请求地址 * @return */ public static String post(String url) { return post(url, null, "UTF-8"); } /** * POST 请求 * @param url 请求地址 * @param map 请求参数 * @return */ public static String post(String url, Map
        
          map) { return post(url, map, "UTF-8"); } }