如何调用别人的接口(包含get请求post请求)

对于如何调用第三方接口还是有些模糊,所以记录一下,上代码

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";
   // 妙兜测试接口
   public static final String POST_URL = "http://121.40.204.191:8180/mdserver/service/installLock";
   
   /**
   
   * 接口调用 GET
   
   */
   
   public static void httpURLConectionGET() {
   try {
   
   URL url = new URL(GET_URL); // 把字符串转换为URL请求地址
   
   HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接
   
   connection.connect();// 连接会话
   
   // 获取输入流
   
   BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
   
   String line;
   
   StringBuilder sb = new StringBuilder();
   
   while ((line = br.readLine()) != null) {// 循环读取流
   
   sb.append(line);
   
   }
   
   br.close();// 关闭流
   
   connection.disconnect();// 断开连接
   
   System.out.println(sb.toString());
   
   } catch (Exception e) {
   
   e.printStackTrace();
   
   System.out.println("失败!");
   
   }
   
   }
   
   /**
   
   * 接口调用 POST
   
   */
   
   public static void httpURLConnectionPOST () {
   
   try {
   
   URL url = new URL(POST_URL);
   // 将url 以 open方法返回的urlConnection 连接强转为HttpURLConnection连接 (标识一个url所引用的远程对象连接)
   HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此时cnnection只是为一个连接对象,待连接中
   // 设置连接输出流为true,默认false (post 请求是以流的方式隐式的传递参数)
   connection.setDoOutput(true);
   // 设置连接输入流为true
   connection.setDoInput(true);
   // 设置请求方式为post
   connection.setRequestMethod("POST");
   // post请求缓存设为false
   connection.setUseCaches(false);
   // 设置该HttpURLConnection实例是否自动执行重定向
   connection.setInstanceFollowRedirects(true);
   // 设置请求头里面的各个属性 (以下为设置内容的类型,设置为经过urlEncoded编码过的from参数)
   // application/x-javascript text/xml->xml数据 application/x-javascript->json对象 application/x-www-form-urlencoded->表单数据
   // ;charset=utf-8 必须要，不然妙兜那边会出现乱码【★★★★★】
   connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");
   // 建立连接 (请求未开始,直到connection.getInputStream()方法调用时才发起,以上各个参数设置需在此方法之前进行)
   connection.connect();
   // 创建输入输出流,用于往连接里面输出携带的参数,(输出内容为?后面的内容)
   DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());
   String app_key = "app_key="+ URLEncoder.encode("4f7bf8c8260124e6e9c6bf094951a111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
   String agt_num = "&agt_num="+ URLEncoder.encode("10111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
   String pid = "&pid="+ URLEncoder.encode("BLZXA150401111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
   String departid = "&departid="+ URLEncoder.encode("10007111", "utf-8"); // 已修改【改为错误数据，以免信息泄露】
   String install_lock_name = "&install_lock_name="+ URLEncoder.encode("南天大门", "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;
   // 将参数输出到连接
   dataout.writeBytes(parm);
   // 输出完成后刷新并关闭流
   dataout.flush();
   dataout.close(); // 重要且易忽略步骤 (关闭流,切记!)
   // System.out.println(connection.getResponseCode());
   // 连接发起请求,处理服务器响应 (从连接获取到输入流并包装为bufferedReader)
   
   BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
   
   String line;
   
   StringBuilder sb = new StringBuilder(); // 用来存储响应数据
   
   // 循环读取流,若不到结尾处
   
   while ((line = bf.readLine()) != null) {
   
   // sb.append(bf.readLine());
   
   sb.append(line).append(System.getProperty("line.separator"));
   
   }
   bf.close(); // 重要且易忽略步骤 (关闭流,切记!)
   
   connection.disconnect(); // 销毁连接
   
   System.out.println(sb.toString());
   
   } catch (Exception e) {
   
   e.printStackTrace();
   
   }
   
   }
   
   public static void main(String[] args) {
   
   // httpURLConectionGET();
   
   httpURLConnectionPOST();
   
   }
   }　
   

   只使用了POST请求方法，GET没有用，为了保证代码完整性所以没有删除GET请求代码 
       返回结果：

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

   　　转载于:https://blog.csdn.net/Javaming_o_O/article/details/91411649