页面转发出错

报如下错:
HTTP Status 405 - HTTP method GET is not supported by this URL--------------------------------------------------------------------------------type Status reportmessage HTTP method GET is not supported by this URLdescription The specified HTTP method is not allowed for the requested resource (HTTP method GET is not supported by this URL).
--------------------------------------------------------------------------------Apache Tomcat/5.5.26
(初学servlet,不大明白)
 TableReturnToFill.java 如下:
package servlettest;import java.io.IOException;
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class TableReturnToFill extends javax.servlet.http.HttpServlet implements
javax.servlet.Servlet { String name = "", email = "", num = ""; //判断是否要将页面转到登录页面,
public boolean needReturn(String str) { if (str.trim().equals("") || str == null
|| str.trim().toLowerCase().equals("default"))
return true;
return false;
}
//如果有一项未填,则转回去重填

public boolean needReturn() { if (needReturn(name) || needReturn(email) || needReturn(num))
return true;
return false; } protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html;charset=gbk");
request.setCharacterEncoding("gbk");
 
name=request.getParameter("name");
email=request.getParameter("email");
num=request.getParameter("num"); if (needReturn())
 
request.getRequestDispatcher( "/ReturnBackToFill.html");
else
request.getRequestDispatcher("/theResult.jsp"); } protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
} public String getServletInfo() {
return "反回以重新填写未完内容";
}
}
ReturnBackToFill.html页面如下:<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form method="post" action="TableReturnToFill">姓名<input
type="text" name="name" value="" /><br />email <input type="text" name="email"><br />
学号 <input type="text" name="num"><br>
<input type=submit name="提交" value="提交"></form>
</body>
</html>the.jsp:
页面如下:<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body><% request.getParameter("name");%>
<% request.getParameter("email");%>
<%request.getParameter("num"); %>
</body>
</html>