HttpClientUtil 工具类实现跨域请求数据-白红宇

HttpClientUtil 工具类实现跨域请求数据

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发布时间：2019-06-25

本文共 4926 字，大约阅读时间需要 16 分钟。

1 package com.xxx.common.util;  2   3 import java.io.IOException;  4 import java.net.URI;  5 import java.util.ArrayList;  6 import java.util.List;  7 import java.util.Map;  8 import org.apache.http.NameValuePair;  9 import org.apache.http.client.entity.UrlEncodedFormEntity; 10 import org.apache.http.client.methods.CloseableHttpResponse; 11 import org.apache.http.client.methods.HttpGet; 12 import org.apache.http.client.methods.HttpPost; 13 import org.apache.http.client.utils.URIBuilder; 14 import org.apache.http.entity.ContentType; 15 import org.apache.http.entity.StringEntity; 16 import org.apache.http.impl.client.CloseableHttpClient; 17 import org.apache.http.impl.client.HttpClients; 18 import org.apache.http.message.BasicNameValuePair; 19 import org.apache.http.util.EntityUtils; 20  21 public class HttpClientUtil { 22  23     public static String doGet(String url, Map
     
       param) { 24         // 创建Httpclient对象 25         CloseableHttpClient httpclient = HttpClients.createDefault(); 26         String resultString = ""; 27         CloseableHttpResponse response = null; 28         try { 29             // 创建uri 30             URIBuilder builder = new URIBuilder(url); 31             if (param != null) { 32                 for (String key : param.keySet()) { 33                     builder.addParameter(key, param.get(key)); 34                 } 35             } 36             URI uri = builder.build(); 37  38             // 创建http GET请求 39             HttpGet httpGet = new HttpGet(uri); 40  41             // 执行请求 42             response = httpclient.execute(httpGet); 43             // 判断返回状态是否为200 44             if (response.getStatusLine().getStatusCode() == 200) { 45                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8"); 46             } 47         } catch (Exception e) { 48             e.printStackTrace(); 49         } finally { 50             try { 51                 if (response != null) { 52                     response.close(); 53                 } 54                 httpclient.close(); 55             } catch (IOException e) { 56                 e.printStackTrace(); 57             } 58         } 59         return resultString; 60     } 61  62     public static String doGet(String url) { 63         return doGet(url, null); 64     } 65  66     public static String doPost(String url, Map
      
        param) { 67         // 创建Httpclient对象 68         CloseableHttpClient httpClient = HttpClients.createDefault(); 69         CloseableHttpResponse response = null; 70         String resultString = ""; 71         try { 72             // 创建Http Post请求 73             HttpPost httpPost = new HttpPost(url); 74             // 创建参数列表 75             if (param != null) { 76                 List
       
         paramList = new ArrayList<>(); 77                 for (String key : param.keySet()) { 78                     paramList.add(new BasicNameValuePair(key, param.get(key))); 79                 } 80                 // 模拟表单 81                 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList, "utf-8"); 82                 httpPost.setEntity(entity); 83             } 84             // 执行http请求 85             response = httpClient.execute(httpPost); 86             resultString = EntityUtils.toString(response.getEntity(), "utf-8"); 87         } catch (Exception e) { 88             e.printStackTrace(); 89         } finally { 90             try { 91                 response.close(); 92             } catch (IOException e) { 93                 e.printStackTrace(); 94             } 95         } 96         return resultString; 97     } 98  99     public static String doPost(String url) {100         return doPost(url, null);101     }102 103     /**104      * 请求的参数类型为json105      * @param url106      * @param json107      * @return108      * {username:"",pass:""}109      */110     public static String doPostJson(String url, String json) {111         // 创建Httpclient对象112         CloseableHttpClient httpClient = HttpClients.createDefault();113         CloseableHttpResponse response = null;114         String resultString = "";115         try {116             // 创建Http Post请求117             HttpPost httpPost = new HttpPost(url);118             // 创建请求内容119             StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);120             httpPost.setEntity(entity);121             // 执行http请求122             response = httpClient.execute(httpPost);123             resultString = EntityUtils.toString(response.getEntity(), "utf-8");124         } catch (Exception e) {125             e.printStackTrace();126         } finally {127             try {128                 response.close();129             } catch (IOException e) {130                 e.printStackTrace();131             }132         }133         return resultString;134     }135 }