Http協議格式——socket實現http文件上傳

RT，做項目中有時候會遇到服務端爲web服務，但在客戶端需要通過socket來與之交互的情況，這時候就需要用到socket來模擬http傳輸。。自己做過一次抓包分析，但是沒把結果記錄下來，後來做項目中需要用到，才百度了一下，現在把百度到的結果記錄下來……

代碼如下，具體結構自己稍微動下腦子就能看出來吧。。。

private static final String BOUNDARY = "---------------------------7db1c523809b2";// 數據分割線

	private static final String DIRECTORY = "e:\\";

	/**
	 * 
	 * @see java Socket 模擬 http上傳文件
	 * 
	 * @see 多文件上傳
	 */
	public static void upload(String name, List<File> files) throws Exception {
		// 表單字段和文件的數據
		StringBuilder sb = new StringBuilder();
		sb.append("\r\n\r\n--" + BOUNDARY + "\r\n");
		sb.append("Content-Disposition: form-data; name=\"name\"" + "\r\n");
		sb.append("\r\n");
		sb.append(name + "\r\n");

		sb.append("--" + BOUNDARY + "\r\n");
		sb.append("Content-Disposition: form-data; name=\"age\"" + "\r\n");
		sb.append("\r\n");
		sb.append(30 + "\r\n");

		// 文件之前的數據
		byte[] before = sb.toString().getBytes("UTF-8");
		// 文件之後的數據
		byte[] after = ("--" + BOUNDARY + "--\r\n").getBytes("UTF-8");
String uploadURL = "/PosAxis/servlet/UploadServlet"; //上傳文件的Servlet

		URL url = new URL("http://192.168.210.251:8080"+uploadURL);
		Socket socket = new Socket(url.getHost(), url.getPort());
		socket.setSoTimeout(30000);
		socket.setKeepAlive(true);
		socket.setSendBufferSize(262144);
		socket.setReceiveBufferSize(262144);
		OutputStream out = socket.getOutputStream();
		PrintStream ps = new PrintStream(out, true, "UTF-8");

		long length = 0;
		int blen = 0;
		for (int i = 0; i < files.size(); i++) {
			length += files.get(i).length();

			sb = new StringBuilder();
			sb.append("--" + BOUNDARY + "\r\n");
			sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + files.get(i).getName() + "\"" + "\r\n");
			sb.append("Content-Type: image/pjpeg" + "\r\n");
			sb.append("\r\n");

			blen += sb.toString().getBytes("UTF-8").length;
		}//請求頭
		StringBuffer header = new StringBuffer();
		header.append("POST "+uploadURL+" HTTP/1.1\r\n");
		header.append("Host: 192.168.210.251:8080\r\n");
		header.append("Accept: */*\r\n");
		header.append("Accept-Language: zh-cn\r\n");
		header.append("Accept-Charset: utf-8\r\n");
		header.append("Content-Type: multipart/form-data; boundary=" + BOUNDARY + "\r\n");
		header.append("Content-Length: " + String.valueOf(before.length + blen + length + after.length));
		ps.print(header);


		out.write(before);
		byte[] buf = new byte[2048];
		int len;
		for (int i = 0; i < files.size(); i++) {
			sb = new StringBuilder();
			sb.append("--" + BOUNDARY + "\r\n");
			sb.append("Content-Disposition: form-data; name=\"file\"; filename=\"" + files.get(i).getName() + "\"" + "\r\n");
			sb.append("Content-Type: image/pjpeg" + "\r\n");
			sb.append("\r\n");
			out.write(sb.toString().getBytes("UTF-8"));
			InputStream in = new FileInputStream(files.get(i));
			while ((len = in.read(buf)) != -1) {
				out.write(buf, 0, len);out.flush();
			in.close();
			out.write("\r\n".getBytes("UTF-8"));
		}

		out.write(after);
		out.flush();
		out.close();
	}