public class Servlet2 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req,
HttpServletResponse resp )throws ServletException, IOException {
super.doGet(req, resp);
}
@Override
protected void doPost(HttpServletRequest req,
HttpServletResponse resp)throws ServletException, IOException {
//设置响应类型
resp.setContentType("text/html;charset=utf-8") ;
//从响应实例中获取打印流
PrintWriter out = resp.getWriter() ;
out.println("<html>") ;
out.println("<head><title>servlet2</title></head>") ;
out.println("<body>") ;
out.println("从Servlet2中获取请求参数name的值：") ;
out.println(req.getParameter("name")) ;
out.println("</body>") ;
out.println("</html>") ;
}
}
此时我们访问：http://localhost:8000/../servlet2?name=test
就会出现：
HTTP Status 405 - HTTP method GET is not supported by this URL
出现错误的原因：
1，继承HttpServlet的Servlet没有覆写对应请求和响应的处理方法即：doGet或
doPost等方法；默认调用了父类的doGet或doPost等方法；
2， 父类HttpServlet的doGet()或doPost()方法覆盖了你重写的doGet或doPost等
方法；
只要出现以上的情况之一，父类HttpServlet的doGet或doPost等方法的默认实现是
返回状态代码为405的HTTP错误表示：对于指定资源的请求方法不被允许。
解决方法：
1，子类覆写父类的doGet或doPost等方法；
2，在你的Servlert中覆写doGet或doPost等方法来处理请求和响应，不要调用父类
HttpServlet的doGet() 和 doPost()方法，即：
将doGet()方法中的 super.doGet(req, resp);
改为：this.doPost(req , resp) ; 可以解决问题。
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