java file upload interface to call back

Reference: https://blog.csdn.net/yjclsx/article/details/70675057

1  / * 
2       * upload file interface call flow upload files
 . 3       * @param URL
 . 4       * @param path
 . 5       * @return 
. 6       * / 
. 7      public  static String sendPostUplodFile (URL String, String path) {
 . 8          the DataOutputStream OUT = null ;
 . 9          = in the BufferedReader null ;
 10          String Result = "" ;
 . 11          the try {
 12 is              the URL realUrl = new new the URL (URL);
 13 is              //The connection between the opening and the URL 
14              the HttpURLConnection Conn = (the HttpURLConnection) realUrl.openConnection ();
 15              // send POST request must set the following two lines 
16              conn.setDoOutput ( to true );
 . 17              conn.setDoInput ( to true );
 18 is              
. 19              String = the BOUNDARY "---- WebKitFormBoundary07I8UIuBx6LN2KyY" ;
 20 is              conn.setUseCaches ( to false );
 21 is              conn.setRequestMethod ( "the POST" );
 22 is              conn.setRequestProperty ( "Connection", "the Keep-Alive" );
 23 is  //            conn.setRequestProperty("user-agent", "Mozilla/4.0 (conpatible; MSIE 6.0; Windows NT 5.1; SV1)");
24             conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36");
25             conn.setRequestProperty("Charsert", "UTF-8");
26             conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
27             conn.connect();
28             
29             out = new DataOutputStream(conn.getOutputStream());
30             byte[] end_data = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
31             //添加参数
32             StringBuffer sb1 = new StringBuffer();
33             sb1.append("--");
34             sb1.append(BOUNDARY);
35             sb1.append("\r\n");
36             sb1.append("Content-Disposition: form-data;name=\"luid\"");
37             sb1.append("\r\n");
38             sb1.append("\r\n");
39             sb1.append("123");
40             sb1.append("\r\n");
41             out.write(sb1.toString().getBytes());
42             //添加参数file
43             File file = new File(path);
44             StringBuffer sb = new StringBuffer();
45             sb.append("--");
46             sb.append(BOUNDARY);
47             sb.append("\r\n");
48             sb.append("Content-Disposition: form-data;name=\"file\";filename=\"" + file.getName() + "\"");
49             sb.append("\r\n");
50             sb.append("Content-Type: application/octet-stream");
51             sb.append("\r\n");
52             sb.append("\r\n");
53             out.write(sb.toString().getBytes());
54             
55             DataInputStream in1 = new DataInputStream(new FileInputStream(file));
56             int bytes = 0;
57             byte[] bufferOut = new byte[1024];
58             while ((bytes = in1.read(bufferOut)) != -1) {
59                 out.write(bufferOut,0,bytes);
60             }
61             out.write ( "\ R & lt \ n-" .getBytes ());
 62 is              in1.close ();
 63 is              out.write (end_data);
 64              
65              // buffer flush output stream 
66              out.flush ();
 67              // defined BufferedReader input stream to retrieve the response of the URL 
68              in = new new BufferedReader ( new new the InputStreamReader (conn.getInputStream ()));
 69              String Line;
 70              the while (! (= in.readLine Line ()) = null ) {
 71 is                  Result = + Line;
 72              }
 73 is          }the catch (Exception E) {
 74              // the TODO Auto-Generated Block the catch 
75              log.error ( "POST request transmission abnormality" + E);
 76              e.printStackTrace ();
 77          } the finally {
 78              the try {
 79                  IF (OUT! = null ) {
 80                      the out.close ();
 81                  }
 82                  IF (in =! null ) {
 83                      in.close ();
 84                  }
 85              } the catch (Exception ex) {
86                 // TODO: handle exception
87                 ex.printStackTrace();
88             }
89         }
90         return result;
91     }

 //将字符串转换json并取值
1 public static String getFileId(String result) {
 2         JSONObject json = JSONObject.parseObject(result);
 3         String fileId = "";
 4         if (result != null) {
 5             String code = json.getString("errorCode");
 6             if (code.equals("0000")) {
 7                 fileId = json.getString("fileId");
 8             }
 9         }
10         
11         return fileId;
12     }