servlet中的请求参数，对于调试servlet很有用

每次调试都很烦，没有必要用每次都用调试模式，直接打出来一切OK。

req.setCharacterEncoding("UTF-8");
		resp.setCharacterEncoding("UTF-8");
		resp.setContentType("text/html;charset=utf-8");
		
		@SuppressWarnings("rawtypes")
		Enumeration e = req.getParameterNames();
		while (e.hasMoreElements()) {
			String name = (String) e.nextElement();
			String value = req.getParameter(name);
			logger.info(name + "=" + value);
		}