servlet404, 405 problem

404

1. Servlet configuration

Pay attention to the mapping between servlet and servlet-mapping, pay attention to whether the servlet-class is written correctly, if it is correct, you can click on it with the mouse

  <servlet>
  	<servlet-name>HelloServlet</servlet-name>
  	<servlet-class>servlet.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>HelloServlet</servlet-name>
  	<url-pattern>/hello</url-pattern>
  </servlet-mapping>

2. Stored webpage location

login.html is located in the WebContent directory, alongside META-INF and WEB-INF

• WebContent
  • META-INF
  • WEB-INF
  • login.html

3. Access path

Address/Project Name/Webpage
http://127.0.0.1/servlet/login.html

Address/project name/corresponding url-pattern
http://127.0.0.1/servlet/hello

405

The form method does not match the servlet processing method

If the form method is post, the servlet background processing method must also be doPost

<form action="login" method="post">
账号: <input type="text" name="name"> <br>
密码: <input type="password" name="password"> <br>
<input type="submit" value="登录">
</form>

protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
    
    
        String name = request.getParameter("name");
        String password = request.getParameter("password");
  
        System.out.println("name:" + name);
        System.out.println("password:" + password);
    }