exitservlet.java

JSP版的网上书店系统

package shop;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public final class ExitServlet extends HttpServlet{  
	
	public  ExitServlet(){
		super();
	}
	
	public void init(ServletConfig config)throws ServletException{
		super.init(config);
	}
	public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {      
		
	
		HttpSession session = req.getSession();
		if(session==null){
			System.out.println("no session");
			System.exit(1);
			
		}
 		session.removeAttribute(Constants.LOGIN_USER_KEY);
	   	resp.sendRedirect("index.jsp");					
 	}

}