adminfilter.java

网上购物源代码

package com.chinaaccpFilter;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AdminFilter implements Filter {

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {
		
		HttpServletRequest request = (HttpServletRequest)arg0;
		HttpServletResponse response = (HttpServletResponse)arg1;
		HttpSession session = request.getSession();
		PrintWriter out =  response.getWriter();
		String name = (String)session.getAttribute("name");
		if(name!=null)
			arg2.doFilter(arg0, arg1);
		else
		{
			out.println("<script>");
			out.println("alert('你还没有登陆');");
			out.println("location.href='../admin.jsp';");
			out.println("</script>");
		}

	}

	public void init(FilterConfig arg0) throws ServletException {
		

	}

	/**
	 * Constructor of the object.
	 */
	public AdminFilter() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}