safefilter.java

cantain海鲜超市管理系统

package com.j1132.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import com.j1132.bean.UserBean;
import com.j1132.util.Constance;

public class SafeFilter implements Filter {

	public void destroy() {

		System.out.println(this.getClass().getName() + "destroy方法被调用");
	}

	public void doFilter(ServletRequest arg0, ServletResponse arg1,
			FilterChain arg2) throws IOException, ServletException {

		System.out.println(this.getClass().getName() + "的doFilter方法被调用");

		HttpServletRequest req = (HttpServletRequest) arg0;

		String servletPath = req.getServletPath();

		if (!"/UserServlet.shtml".equals(servletPath)) {

			UserBean ub = (UserBean) req.getSession().getAttribute(
					Constance.CURRENT_USER);

			String page = "/jsp/sf_login.jsp";

			if (ub != null) {
				arg2.doFilter(arg0, arg1);
			} else {
				RequestDispatcher rd = arg0.getRequestDispatcher(page);

				rd.forward(arg0, arg1);
			}
		} else {
			arg2.doFilter(arg0, arg1);
		}

	}

	public void init(FilterConfig arg0) throws ServletException {

		System.out.println(this.getClass().getName() + "的init方法被调用");

	}

}