package mywebapp;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
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 userLoginCheckFilter implements Filter {
public static final String login_page = "/index.jsp";
public void destroy(){
}
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)throws ServletException, IOException {
// servletRequest.setCharacterEncoding("UTF-8");
//servletResponse.setCharacterEncoding("UTF-8");
HttpServletRequest request = (HttpServletRequest)servletRequest;
HttpServletResponse response = (HttpServletResponse)servletResponse;
String currentURL = request.getRequestURI();
String ctxPath = request.getContextPath();
//除掉项目名称时访问页面当前路径
String targetURL = currentURL.substring(ctxPath.length());
System.out.println(targetURL);
List<String>info = new ArrayList<String>();
HttpSession session = request.getSession(false);
//对当前页面进行判断,如果当前页面不为登录页面
if(!(("/index.jsp".equals(targetURL)) || ("/selectLogin.jsp".equals(targetURL)) || ("/studentLogin.jsp".equals(targetURL)))){
//System.out.println("1"+targetURL+"ctxPath:"+ctxPath+"currentURL:"+currentURL);
//在不为登陆页面时,再进行判断,如果不是登陆页面也没有session则跳转到登录页面,
if(session == null || session.getAttribute("admin") == null){
info.add("You are not logged in!");
request.setAttribute("info",info);
request.getRequestDispatcher(login_page).forward(request,response);
return;
}else{
//这里表示正确,会去寻找下一个链,如果不存在,则进行正常的页面跳转
filterChain.doFilter(request, response);
return;
}
}else{
//这里表示如果当前页面是登陆页面,跳转到登陆页面
try{
filterChain.doFilter(request, response);
}catch (Exception e){
throw e;
}
return;
}
}
public void init(FilterConfig filterConfig)throws ServletException{
}
}
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