报错405怎么解决？
package com.bjsxt.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* 获取请求数据
*/
public class GetRequestDataServlet 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 {
String username = req.getParameter("username");
PrintWriter out = resp.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.println("USERNAME:"+username+"<br/>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="getInfo.do",method="post">
用户名：<input type="text" name="username"/><br/>
<input type="submit" value="ok">
</form>
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>demoServlet</servlet-name>
<servlet-class>com.bjsxt.servlet.DemoServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>demoServlet</servlet-name>
<url-pattern>/demo.do</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>getRequestDataServlet</servlet-name>
<servlet-class>com.bjsxt.servlet.GetRequestDataServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>getRequestDataServlet</servlet-name>
<url-pattern>/getInfo.do</url-pattern>
</servlet-mapping>
</web-app>
点运行之后，页面还是QWE，怎么回事?刷新也没用
求薪资总和哪里还是有些不太懂的 ，老师麻烦能详细讲一下嘛.
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