通用HttpClientUtil工具類

 1 package com.*.utils;  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  * Created by Administrator on 2018/4/27.  22  */
 23 public class HttpClientUtil {  24  
 25     public static String doGet(String url, Map<String, String> param) {  26  
 27         // 建立Httpclient對象
 28         CloseableHttpClient httpclient = HttpClients.createDefault();  29  
 30         String resultString = "";  31         CloseableHttpResponse response = null;  32         try {  33             // 建立uri
 34             URIBuilder builder = new URIBuilder(url);  35             if (param != null) {  36                 for (String key : param.keySet()) {  37  builder.addParameter(key, param.get(key));  38  }  39  }  40             URI uri = builder.build();  41  
 42             // 建立http GET請求
 43             HttpGet httpGet = new HttpGet(uri);  44  
 45             // 執行請求
 46             response = httpclient.execute(httpGet);  47             // 判斷返回狀態是否爲200
 48             if (response.getStatusLine().getStatusCode() == 200) {  49                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8");  50  }  51         } catch (Exception e) {  52  e.printStackTrace();  53         } finally {  54             try {  55                 if (response != null) {  56  response.close();  57  }  58  httpclient.close();  59             } catch (IOException e) {  60  e.printStackTrace();  61  }  62  }  63         return resultString;  64  }  65  
 66     public static String doGet(String url) {  67         return doGet(url, null);  68  }  69  
 70     public static String doPost(String url, Map<String, String> param) {  71         // 建立Httpclient對象
 72         CloseableHttpClient httpClient = HttpClients.createDefault();  73         CloseableHttpResponse response = null;  74         String resultString = "";  75         try {  76             // 建立Http Post請求
 77             HttpPost httpPost = new HttpPost(url);  78             // 建立參數列表
 79             if (param != null) {  80                 List<NameValuePair> paramList = new ArrayList<>();  81                 for (String key : param.keySet()) {  82                     paramList.add(new BasicNameValuePair(key, param.get(key)));  83  }  84                 // 模擬表單
 85                 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");  86  httpPost.setEntity(entity);  87  }  88             // 執行http請求
 89             response = httpClient.execute(httpPost);  90             resultString = EntityUtils.toString(response.getEntity(), "utf-8");  91         } catch (Exception e) {  92  e.printStackTrace();  93         } finally {  94             try {  95  response.close();  96             } catch (IOException e) {  97                 // TODO Auto-generated catch block
 98  e.printStackTrace();  99  } 100  } 101  
102         return resultString; 103  } 104  
105     public static String doPost(String url) { 106         return doPost(url, null); 107  } 108  
109     public static String doPostJson(String url, String json) { 110         // 建立Httpclient對象
111         CloseableHttpClient httpClient = HttpClients.createDefault(); 112         CloseableHttpResponse response = null; 113         String resultString = ""; 114         try { 115             // 建立Http Post請求
116             HttpPost httpPost = new HttpPost(url); 117             // 建立請求內容
118             StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON); 119  httpPost.setEntity(entity); 120             // 執行http請求
121             response = httpClient.execute(httpPost); 122             resultString = EntityUtils.toString(response.getEntity(), "utf-8"); 123         } catch (Exception e) { 124  e.printStackTrace(); 125         } finally { 126             try { 127  response.close(); 128             } catch (IOException e) { 129                 // TODO Auto-generated catch block
130  e.printStackTrace(); 131  } 132  } 133  
134         return resultString; 135  } 136 }