java模擬上傳多媒體文件到微信公衆平臺

/**
        * 上傳多媒體文件到微信公衆平臺
        * @param fileType 文件類型
        * @param access_token //在微信平臺獲取到的憑證
        * @param filename 文件名稱
        * @param file 文件流
        * @param content_type 文件類型
        * @param filePath 文件路徑
        * @return
        */
        public static JSON uploadmedia(String fileType,String access_token,String filename, File file,
        String content_type, String filePath){
                String result = "";
                String end="\r\n";
                String twoHyphens = "--"; //用於拼接
                String boundary="*****"; //用於拼接 可自定義
                URL submit = null;
                JSONObject json=null;
                String requestUrl="http://file.api.weixin.qq.com/cgi-bin/media/upload?access_token="
                + access_token + "&type=" + fileType;
                try {
                submit = new URL(requestUrl);
                HttpURLConnection conn=(HttpURLConnection) submit.openConnection();
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.setUseCaches(false);
        
                conn.setRequestMethod("POST");
                conn.setRequestProperty("Connection", "Keep-Alive");
                conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
                //獲取輸出流對象，準備上傳文件
                DataOutputStream dos=new DataOutputStream(conn.getOutputStream());
                dos.writeBytes(twoHyphens+boundary+end);
                dos.writeBytes("Content-Disposition: form-data; name=\""+file+"\";filename=\""
                +filename+";filelength=\""+file.length() / 1024 +";Content-Type=\""+content_type+end);
                dos.writeBytes(end);
                //對文件進行傳輸
                FileInputStream fis=new FileInputStream(file);
                byte[] buffer = new byte[8192]; // 8k
                int count = 0;
                while ((count = fis.read(buffer)) != -1)
                {
                dos.write(buffer, 0, count);
                }
                fis.close(); //關閉文件流
        
                dos.writeBytes(end);
                dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
                dos.flush();
        
                InputStream is = conn.getInputStream();
                InputStreamReader isr = new InputStreamReader(is, "utf-8");
                BufferedReader br = new BufferedReader(isr);
                result = br.readLine();
                dos.close();
                is.close();
        
                } catch (Exception e) {
                        e.printStackTrace();
                        System.out.println("與服務器連接發生異常錯誤:" + e.toString());
                        System.out.println("連接地址是:" + requestUrl);
                }
                json = JSONObject.fromObject(result); //獲取到返回Json請自行根據返回碼獲取相應的結果
                return json;
        }
        
        public static void main(String[] args) throws IOException {
                JSON json = uploadmedia("image", "MKRGxuzca1jZn6s2vJ5IPXhj88cOy8aheJ-5r75HL4hLnLXs_o960GnfGMh9KJooTxwwr0qPlRwALSyrFlpJ-w", "jiqimao", new File("D:\\jiqimao.jpg"), "image/jpeg", "D:\\jiqimao.jpg");
                System.out.println(json.toString());
        }