authfilter.java

用java开发的一个企业的DRP系统源码

package com.bjsxt.drp.util.filter;

import java.io.IOException;

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.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 用filter完成系统权限验证
 * @author Administrator
 *
 */
public class AuthFilter implements Filter {

	public void destroy() {
		System.out.println("AuthFilter destroy()");
	}

	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest)servletRequest;
		HttpServletResponse response = (HttpServletResponse)servletResponse;
		HttpSession session = request.getSession(false);
		System.out.println("session==" + session);
		if (session == null || session.getAttribute("user") == null) {
			System.out.println("ContextPath==" + request.getContextPath());
			//注意request.getContextPath()
			response.sendRedirect(request.getContextPath() + "/login.jsp");
			//response.sendRedirect("/login.jsp");
			return;
		}
		filterChain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		System.out.println("AuthFilter init()");
	}

}