过滤doFilter

package mq; 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; public class MyIsLoginFilter implements Filter { protected FilterConfig fc; public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { // TODO Auto-generated method stub System.out.println("inter MyIsLoginFilter/doFilter(...)"); HttpServletRequest hsRequest = (HttpServletRequest)arg0; HttpServletResponse hsResponse = (HttpServletResponse)arg1; String isLogin = (String)hsRequest.getSession().getAttribute("isLogin"); /* hsRequest.getSession().getAttribute("isLogin")中的isLogin 是在action或servlet类中request.getSession().setAttribute("isLogin", "denglu"); */ String wenjianming = hsRequest.getRequestURI().substring(hsRequest.getRequestURI().lastIndexOf("/")+1); System.out.println("isLogin = "+isLogin+" wenjianming = "+wenjianming); if(!wenjianming.equals("login.jsp") && !wenjianming.equals("chuLiLoginAction.do")){ if(isLogin.equals("weidenglu") || isLogin == null){ System.out.println("你未登陆！"); hsResponse.sendRedirect("../login.jsp"); } } arg2.doFilter(hsRequest, hsResponse); System.out.println("exit MyIsLoginFilter/doFilter(...)"); } public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub this.fc = arg0; } public void setFilterConfig(FilterConfig fc){ this.fc = fc; } public void destroy() { // TODO Auto-generated method stub this.fc = null; } }