寫好一個Servlet後訪問時丟擲"HTTP method GET is not supported by this URL"的錯誤，先是自己找了一下原因，後又在網路查詢相關的原因後找到解決方案。

問題的原因是用Eclipse生成Servlet時，會在doGet和doPost自動新增預設呼叫父類的構造方法，如下紅色標識程式碼:
super.doPost();
super.doGet();

 /** 
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 
     */ 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        // TODO Auto-generated method stub 
        super.doGet(request, response); 
    } 
    /** 
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 
     */ 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { 
        // TODO Auto-generated method stub 
        super.doPost(request, response); 
    }
 

這個時候就會有個問題，如果直接呼叫父類的方法，就相當於父類HttpServlet的doGet或doPost方法覆蓋了你重寫的方法，而父類HttpServlet的doGet或doPost方法的預設實現是返回狀態程式碼為405的HTTP錯誤，表示對於指定資源的請求方法不被允許。刪除以上程式碼當中呼叫父類的方法後問題迎刃而解。

文章出處：http://www.diybl.com/course/3_program/java/javajs/2008923/144667.html