java傳送GET和post請求

weixin_30639719發表於2020-04-05
Java
  1 package com.baqingshe.bjs.util;
  2 
  3 import java.io.BufferedReader;
  4 
  5 import java.io.IOException;
  6 
  7 import java.io.InputStream;
  8 
  9 import java.io.InputStreamReader;
 10 
 11 import java.io.PrintWriter;
 12 
 13 import java.net.URL;
 14 
 15 import java.net.URLConnection;
 16 
 17 import java.util.List;
 18 
 19 import java.util.Map;
 20 
 21 import sun.net.www.protocol.http.HttpURLConnection;
 22 
 23 public class HttpRequest {
 24 
 25   public static String doGet(String url) throws Exception {
 26 
 27        URL localURL = new URL(url);
 28 
 29        URLConnection connection = localURL.openConnection();
 30 
 31        HttpURLConnection httpURLConnection = (HttpURLConnection)connection;
 32 
 33        
 34 
 35        httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");
 36 
 37        httpURLConnection.setRequestProperty("Content-Type", "application/json");
 38 
 39        
 40 
 41        InputStream inputStream = null;
 42 
 43        InputStreamReader inputStreamReader = null;
 44 
 45        BufferedReader reader = null;
 46 
 47        StringBuffer resultBuffer = new StringBuffer();
 48 
 49        String tempLine = null;
 50 
 51        
 52 
 53        if (httpURLConnection.getResponseCode() >= 300) {
 54 
 55            throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
 56 
 57        }
 58 
 59        
 60 
 61        try {
 62 
 63            inputStream = httpURLConnection.getInputStream();
 64 
 65            inputStreamReader = new InputStreamReader(inputStream);
 66 
 67            reader = new BufferedReader(inputStreamReader);
 68 
 69            
 70 
 71            while ((tempLine = reader.readLine()) != null) {
 72 
 73                resultBuffer.append(tempLine);
 74 
 75            }
 76 
 77            
 78 
 79        } finally {
 80 
 81            
 82 
 83            if (reader != null) {
 84 
 85                reader.close();
 86 
 87            }
 88 
 89            
 90 
 91            if (inputStreamReader != null) {
 92 
 93                inputStreamReader.close();
 94 
 95            }
 96 
 97            
 98 
 99            if (inputStream != null) {
100 
101                inputStream.close();
102 
103            }
104 
105            
106 
107        }
108 
109        
110 
111        return resultBuffer.toString();
112 
113    }
114 
115    
116 
117     public static String sendPost(String url, String param) {
118 
119         PrintWriter out = null;
120 
121         BufferedReader in = null;
122 
123         String result = "";
124 
125         try {
126 
127             URL realUrl = new URL(url);
128 
129             // 開啟和URL之間的連線
130 
131             URLConnection conn = realUrl.openConnection();
132 
133             // 設定通用的請求屬性
134 
135             conn.setRequestProperty("accept", "*/*");
136 
137             conn.setRequestProperty("connection", "Keep-Alive");
138 
139             conn.setRequestProperty("user-agent",
140 
141                     "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
142 
143             // 傳送POST請求必須設定如下兩行
144 
145             conn.setDoOutput(true);
146 
147             conn.setDoInput(true);
148 
149             // 獲取URLConnection物件對應的輸出流
150 
151             out = new PrintWriter(conn.getOutputStream());
152 
153             // 傳送請求引數
154 
155             out.print(param);
156 
157             // flush輸出流的緩衝
158 
159             out.flush();
160 
161             // 定義BufferedReader輸入流來讀取URL的響應
162 
163             in = new BufferedReader(
164 
165                     new InputStreamReader(conn.getInputStream()));
166 
167             String line;
168 
169             while ((line = in.readLine()) != null) {
170 
171                 result += line;
172 
173             }
174 
175         } catch (Exception e) {
176 
177             System.out.println("傳送 POST 請求出現異常！"+e);
178 
179             e.printStackTrace();
180 
181         }
182 
183         //使用finally塊來關閉輸出流、輸入流
184 
185         finally{
186 
187             try{
188 
189                 if(out!=null){
190 
191                     out.close();
192 
193                 }
194 
195                 if(in!=null){
196 
197                     in.close();
198 
199                 }
200 
201             }
202 
203             catch(IOException ex){
204 
205                 ex.printStackTrace();
206 
207             }
208 
209         }
210 
211         return result;
212 
213     }    
214 
215 }

 

轉載於:https://www.cnblogs.com/daohangtaiqian/p/5067255.html

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