java 调用http接口

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：[java] view plain copy{    "status" : "fail",    "code" : "ERR001",    "msg" : "商户10111不存在"  }