后台获取放在Request Payload中的值

  今天在解析前台EXTJS传过来的表格的值得时候，发现EXT将数据封装到请求的Request Payload中了，如图所示：

后台要想从Request Payload中得到自己想要的数据,就要从流中来获取数据，具体的代码为

private String getStringFromStream(HttpServletRequest req) {
		ServletInputStream is;
		try {
			is = req.getInputStream();
			int nRead = 1;
			int nTotalRead = 0;
			byte[] bytes = new byte[10240];
			while (nRead > 0) {
				nRead = is.read(bytes, nTotalRead, bytes.length - nTotalRead);
				if (nRead > 0)
					nTotalRead = nTotalRead + nRead;
			}
			String str = new String(bytes, 0, nTotalRead, "utf-8");
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}

这就可以解析出来Request payload中的数据了。