java实现分段读取文件并通过HTTP上传的方法

URL url = new URL(actionUrl);HttpURLConnection con = (HttpURLConnection) url.openConnection();/** 允许Input、Output，不使用Cache */con.setDoInput(true);con.setDoOutput(true);con.setUseCaches(false);/** 设定传送的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);/** 设定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);/** 设定每次写入1024bytes */int bufferSize = 1024;byte[] buffer = new byte[bufferSize];int length = -1;/** 从文件读取数据到缓冲区 */while ((length = fStream.read(buffer)) != -1){/** 将数据写入DataOutputStream中 */ds.write(buffer, 0, length);}ds.writeBytes(end);ds.writeBytes(twoHyphens + boundary + twoHyphens + end);/** close streams */fStream.close();ds.flush();