如何調用別人的接口(包含get請求post請求)

對於如何調用第三方接口還是有些模糊,所以記錄一下,上代碼

1. package com.zhang.miaodou;
   
   import java.io.BufferedReader;
   import java.io.DataOutputStream;
   import java.io.InputStreamReader;
   import java.net.HttpURLConnection;
   import java.net.URL;
   import java.net.URLEncoder;
    
   public class DemoTest1 {
   
   public static final String GET_URL = "http://112.4.27.9/mall-back/if_user/store_list?storeId=32";
   
   // public static final String POST_URL = "http://112.4.27.9/mall-back/if_user/store_list";
   // 妙兜測試接口
   public static final String POST_URL = "http://121.40.204.191:8180/mdserver/service/installLock";
   
   /**
   
   * 接口調用 GET
   
   */
   
   public static void httpURLConectionGET() {
   try {
   
   URL url = new URL(GET_URL); // 把字符串轉換為URL請求地址
   
   HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打開連接
   
   connection.connect();// 連接會話
   
   // 獲取輸入流
   
   BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
   
   String line;
   
   StringBuilder sb = new StringBuilder();
   
   while ((line = br.readLine()) != null) {// 循環讀取流
   
   sb.append(line);
   
   }
   
   br.close();// 關閉流
   
   connection.disconnect();// 斷開連接
   
   System.out.println(sb.toString());
   
   } catch (Exception e) {
   
   e.printStackTrace();
   
   System.out.println("失敗!");
   
   }
   
   }
   
    
   /**
   
   * 接口調用 POST
   
   */
   
   public static void httpURLConnectionPOST () {
   
   try {
   
   URL url = new URL(POST_URL);
   // 將url 以 open方法返回的urlConnection 連接強轉為HttpURLConnection連接 (標識一個url所引用的遠程對象連接)
   HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此時cnnection只是為一個連接對象,待連接中
   // 設置連接輸出流為true,默認false (post 請求是以流的方式隱式的傳遞參數)
   connection.setDoOutput(true); 
   // 設置連接輸入流為true
   connection.setDoInput(true);
   // 設置請求方式為post
   connection.setRequestMethod("POST");
   // post請求緩存設為false
   connection.setUseCaches(false);
   // 設置該HttpURLConnection實例是否自動執行重定向
   connection.setInstanceFollowRedirects(true);
   // 設置請求頭里面的各個屬性 (以下為設置內容的類型,設置為經過urlEncoded編碼過的from參數)
   // application/x-javascript text/xml->xml數據 application/x-javascript->json對象 application/x-www-form-urlencoded->表單數據
   // ;charset=utf-8 必須要，不然妙兜那邊會出現亂碼【★★★★★】
   connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
   // 建立連接 (請求未開始,直到connection.getInputStream()方法調用時才發起,以上各個參數設置需在此方法之前進行)
   connection.connect(); 
   // 創建輸入輸出流,用於往連接里面輸出攜帶的參數,(輸出內容為?后面的內容)
   DataOutputStream dataout = new DataOutputStream(connection.getOutputStream()); 
   String app_key = "app_key="+ URLEncoder.encode("4f7bf8c8260124e6e9c6bf094951a111", "utf-8"); // 已修改【改為錯誤數據，以免信息泄露】
   String agt_num = "&agt_num="+ URLEncoder.encode("10111", "utf-8"); // 已修改【改為錯誤數據，以免信息泄露】
   String pid = "&pid="+ URLEncoder.encode("BLZXA150401111", "utf-8"); // 已修改【改為錯誤數據，以免信息泄露】
   String departid = "&departid="+ URLEncoder.encode("10007111", "utf-8"); // 已修改【改為錯誤數據，以免信息泄露】
   String install_lock_name = "&install_lock_name="+ URLEncoder.encode("南天大門", "utf-8");
   String install_address = "&install_address="+ URLEncoder.encode("北京育新", "utf-8");
   String install_gps = "&install_gps="+ URLEncoder.encode("116.350888,40.011001", "utf-8");
   String install_work = "&install_work="+ URLEncoder.encode("小李", "utf-8");
   String install_telete = "&install_telete="+ URLEncoder.encode("13000000000", "utf-8");
   String intall_comm = "&intall_comm="+ URLEncoder.encode("一切正常", "utf-8");
    
   // 格式 parm = aaa=111&bbb=222&ccc=333&ddd=444
   String parm = app_key+ agt_num+ pid+ departid+ install_lock_name+ install_address+ install_gps+ install_work+ install_telete+ intall_comm;
   // 將參數輸出到連接
   dataout.writeBytes(parm);
   // 輸出完成后刷新並關閉流
   dataout.flush();
   dataout.close(); // 重要且易忽略步驟 (關閉流,切記!)
   // System.out.println(connection.getResponseCode());
   // 連接發起請求,處理服務器響應 (從連接獲取到輸入流並包裝為bufferedReader)
   
   BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
   
   String line;
   
   StringBuilder sb = new StringBuilder(); // 用來存儲響應數據
   
    
   // 循環讀取流,若不到結尾處
   
   while ((line = bf.readLine()) != null) {
   
   // sb.append(bf.readLine());
   
   sb.append(line).append(System.getProperty("line.separator"));
   
   }
   bf.close(); // 重要且易忽略步驟 (關閉流,切記!)
   
   connection.disconnect(); // 銷毀連接
   
   System.out.println(sb.toString());
   
    
   } catch (Exception e) {
   
   e.printStackTrace();
   
   }
   
   }
    
   public static void main(String[] args) {
   
   // httpURLConectionGET();
   
   httpURLConnectionPOST();
   
   }
   }　
   

   只使用了POST請求方法，GET沒有用，為了保證代碼完整性所以沒有刪除GET請求代碼 
       返回結果：

   {
   "status" : "fail",
   
   "code" : "ERR001",
   
   "msg" : "商戶10111不存在"
   
   }
   

   　　轉載於:https://blog.csdn.net/Javaming_o_O/article/details/91411649