在建立的servlet中要按照如下順序:
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
//一定是先設定字元再寫PrintWriter,不然跳轉到jsp頁面會亂碼
response.setContentType("text/html");
PrintWriter out = response.getWriter();
}