android 入门学习笔记上传大文件

深藏阁楼爱情的钟 2021-09-12 03:26 375阅读 0赞

connection.setChunkedStreamingMode(chunkSize);

使用这个代码就可以了，connection为 HttpURLConnection的实例

完整代码如下：

/* 上传文件至Server的方法 */
      private void uploadFile()
      {
        String end = "\r\n";
        String twoHyphens = "--";
        String boundary = "*****";
        try
        {
          URL url =new URL(actionUrl);
          HttpURLConnection con=(HttpURLConnection)url.openConnection();
          con.setChunkedStreamingMode(51200);  
          /* 允许Input、Output，不使用Cache */
          con.setDoInput(true);
          con.setDoOutput(true);
          con.setUseCaches(false);
          /* 设置传送的method=POST */
          con.setRequestMethod("POST");
          /* setRequestProperty */
          con.setRequestProperty("Connection", "Keep-Alive");
          con.setRequestProperty("Charset", "UTF-8");
          con.setRequestProperty("Content-Type",
                             "multipart/form-data;boundary="+boundary);
          /* 设置DataOutputStream */
          DataOutputStream ds = 
            new DataOutputStream(con.getOutputStream());
          ds.writeBytes(twoHyphens + boundary + end);
          ds.writeBytes("Content-Disposition: form-data; " +
                        "name=\"file1\";filename=\"" +
                        newName +"\"" + end);
          ds.writeBytes(end);   
    
          /* 取得文件的FileInputStream */
          FileInputStream fStream = new FileInputStream(uploadFile);
          /* 设置每次写入1024bytes */
          int bufferSize = 1024;
          byte[] buffer = new byte[bufferSize];
    
          int length = -1;
          /* 从文件读取数据至缓冲区 */
          while((length = fStream.read(buffer)) != -1)
          {
            /* 将资料写入DataOutputStream中 */
            ds.write(buffer, 0, length);
          }
          ds.writeBytes(end);
          ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
    
          /* close streams */
          fStream.close();
          ds.flush();
    
          /* 取得Response内容 */
          InputStream is = con.getInputStream();
          int ch;
          StringBuffer b =new StringBuffer();
          while( ( ch = is.read() ) != -1 )
          {
            b.append( (char)ch );
          }
          /* 将Response显示于Dialog */
          showDialog(b.toString().trim());
          /* 关闭DataOutputStream */
          ds.close();
        }
        catch(Exception e)
        {
          showDialog(""+e);
        }
      }