allfilter.java

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package com.qhit.sys;

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;

public class AllFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		request.setCharacterEncoding("GBK");
		response.setCharacterEncoding("GBK");
		HttpServletRequest req = (HttpServletRequest) request;
		// 如果是进后台则要判断用户有没有登陆
		if (req.getServletPath().indexOf("/main/") >= 0) {
			// 如果是进入登陆后台的登陆页面或执行用户名密码验证则不用检查
			if ((req.getServletPath().indexOf("/main/index.jsp") >= 0)
					|| (req.getServletPath().indexOf(
							"/main/LoginAction.login.do") >= 0)) {
				chain.doFilter(req, response);
			} else {
				Object obj = req.getSession().getAttribute("userid");

				// 用户没有登陆则转向到登陆页面
				if (obj == null) {
					request.setAttribute("message", "用户没有登陆或登陆已超时，请重新登陆！");
					request.getRequestDispatcher("/index.jsp").forward(req,
							response);
				} else if ("licip".equals(obj)) {
					chain.doFilter(req, response);
				} else {
					// 用户有登陆，但不是admin用户不能进后台
					request.setAttribute("message", "用户" + obj
							+ "不能登陆后台，请用登陆后台的用户名登陆！");
					request.getRequestDispatcher("/index.jsp").forward(req,
							response);

				}
			}
		} else {
			chain.doFilter(req, response);
		}

	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub

	}

}