servlet404、405问题

404

1、servlet配置

注意servlet和servlet-mapping之间的映射，注意servlet-class是否书写正确，正确的话可以用鼠标点开

  <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、存放的网页位置

login.html在WebContent目录下，和META-INF、WEB-INF并列

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

3、访问的路径

地址/项目名/网页
http://127.0.0.1/servlet/login.html

地址/项目名/对应的url-pattern
http://127.0.0.1/servlet/hello

405

表单方法与servlet处理方法不匹配

表单method为post，则servlet后台处理方法也必须时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);
    }