//POST請求中文亂碼處理（在獲得引數值之前設定）

req.setCharacterEncoding("UTF-8");

// GET請求處理中文亂碼

	String username = req.getParameter("username");
	username = new String(username.getBytes("ISO-8859-1"), "UTF-8");
	//縮寫方式
	username = new String(req.getParameter("username").getBytes("ISO-8859-1"), "UTF-8");
	System.out.println(username);
 

res.setContentType("text/html;charset=utf-8");
	res.getWriter().println("你好，世界~");