(android功能代码) android文件上传服务器

Dear 丶 2023-10-10 10:29 14阅读 0赞

/**
     * 通过拼接的方式构造请求内容，实现参数传输以及文件传输
     * @param actionUrl
     * @param params
     * @param files
     * @return
     * @throws IOException
     */
     public static String post(String actionUrl, Map<String, String> params, 
         Map<String, File> files) throws IOException { 
     
      String BOUNDARY = java.util.UUID.randomUUID().toString();
       String PREFIX = "--" , LINEND = "\r\n";
       String MULTIPART_FROM_DATA = "multipart/form-data"; 
       String CHARSET = "UTF-8";
     
      URL uri = new URL(actionUrl); 
       HttpURLConnection conn = (HttpURLConnection) uri.openConnection(); 
       conn.setReadTimeout(5 * 1000); // 缓存的最长时间 
       conn.setDoInput(true);// 允许输入 
       conn.setDoOutput(true);// 允许输出 
       conn.setUseCaches(false); // 不允许使用缓存 
       conn.setRequestMethod("POST"); 
       conn.setRequestProperty("connection", "keep-alive"); 
       conn.setRequestProperty("Charsert", "UTF-8"); 
       conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA + ";boundary=" + BOUNDARY); 
     
      // 首先组拼文本类型的参数 
       StringBuilder sb = new StringBuilder(); 
       for (Map.Entry<String, String> entry : params.entrySet()) { 
         sb.append(PREFIX); 
         sb.append(BOUNDARY); 
         sb.append(LINEND); 
         sb.append("Content-Disposition: form-data; name=\"" + entry.getKey() + "\"" + LINEND);
         sb.append("Content-Type: text/plain; charset=" + CHARSET+LINEND);
         sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
         sb.append(LINEND);
         sb.append(entry.getValue()); 
         sb.append(LINEND); 
       } 
     
      DataOutputStream outStream = new DataOutputStream(conn.getOutputStream()); 
       outStream.write(sb.toString().getBytes()); 
       // 发送文件数据 
       if(files!=null){
         int i = 0;
         for (Map.Entry<String, File> file: files.entrySet()) { 
           StringBuilder sb1 = new StringBuilder(); 
           sb1.append(PREFIX); 
           sb1.append(BOUNDARY); 
           sb1.append(LINEND); 
           sb1.append("Content-Disposition: form-data; name=\"file"+(i++)+"\"; filename=\""+file.getKey()+"\""+LINEND);
           sb1.append("Content-Type: application/octet-stream; charset="+CHARSET+LINEND);
           sb1.append(LINEND);
           outStream.write(sb1.toString().getBytes()); 
     
          InputStream is = new FileInputStream(file.getValue());
           byte[] buffer = new byte[1024]; 
           int len = 0; 
           while ((len = is.read(buffer)) != -1) { 
             outStream.write(buffer, 0, len); 
           }
     
          is.close(); 
           outStream.write(LINEND.getBytes()); 
         } 
       }
       
       //请求结束标志
       byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes(); 
       outStream.write(end_data); 
       outStream.flush(); 
     
      //得到响应码 
       int res = conn.getResponseCode(); 
       InputStream in = null;
       if (res == 200) {
         in = conn.getInputStream(); 
         int ch; 
         StringBuilder sb2 = new StringBuilder(); 
         while ((ch = in.read()) != -1) { 
           sb2.append((char) ch); 
         } 
       }
       return in == null ? null : in.toString(); 
     }