HTTP Status 405 - HTTP method POST is not supported by this URL，这个错到底怎么解决？？

Question

html中代码：
<form action="/servletDemo/servlet_13" method="post">
用户名：<input type="text" name="userName"/><br/>
密码：<input type="text" name="password"/><br/>
<input type="submit" value="提交"/>
</form>

servlet代码：
public class request_2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String value=request.getParameter("userName");
if(value!=null && !value.trim().equals(""))
System.out.println("userName: "+value);
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req,resp);
}

}

Answer 1

public class request_2 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String value=request.getParameter("userName");
if(value!=null && !value.trim().equals(""))
System.out.println("userName: "+value);
response.getRequestDispatch(url).forward(request,response);
}
public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req,resp);
}

}
你servlet没有跳转，请跳转response.getRequestDispatch(url).forward(request,response);
加这句
url为你的jsp地址

Answer 2

doGet(req,resp);
你在doPost里面要又调用doGet
但是你页面上是以post方式访问servlet，所以到了doGet(req,resp)这个地方，无法处理;

追问

public void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String value=req.getParameter("userName");
if(value!=null && !value.trim().equals(""))
System.out.println("userName: "+value);
}
}

这样还是不行

Answer 3

是我眼睛有问题吗，应该是request.getRequestDispatch(url).forward(request,response);吧