denglu.java

登录页面保护(通过jsp调用servlet实现页面保护

package com;
import java.io.*;
import javax.servlet.jsp.tagext.*;
import javax.servlet.http.*;

public class Denglu extends TagSupport
{
	private String name;
	private String pass;
    public void setName(String name) 
    {
        this.name=name;
    } 
    public void setPass(String pass)
    {
    	this.pass=pass;
    }
	public int doStartTag()
	{
		try{
			HttpSession session=pageContext.getSession();
		    HttpServletResponse response=(HttpServletResponse)pageContext.getResponse();
			if(session.getAttribute(name)!=null)
			{
			 	response.sendRedirect("ok.jsp");
			}
			else
			{
				response.sendRedirect("login.htm");
			}			
		}catch(IOException e)
		{
			e.getStackTrace();
		}
		return this.SKIP_BODY;
	}
}