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package user;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;

public class CharacterFilter extends HttpServlet implements Filter {
 /**
  *
  */
 private static final long serialVersionUID = 1L;
 private FilterConfig filterConfig;

 public void destroy() {
 }

 public void init(FilterConfig filterConfig) throws ServletException {
  this.filterConfig = filterConfig;
 }

 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {

  HttpServletRequest req = (HttpServletRequest) request;
  HttpServletResponse res = (HttpServletResponse) response;

  String currentURL = req.getRequestURI();
  String targetURL = currentURL.substring(currentURL.indexOf("/", 1));
//  System.out.println("targetURL" + targetURL);
  

  currentURL.length();
  HttpSession session = req.getSession();
//  System.out.println("session:" + session);
//  System.out.println("session.getAttribute" + req.getContextPath());
  if (targetURL.startsWith("/admin")) {
   chain.doFilter(req, res);
   return;
  }
  if (!"/login.jsp".equals(targetURL) )) {//判斷是不是請求登陸頁(yè)面，如果是則放過(guò)
   if (session == null || session.getAttribute("username") == null) {
    res.sendRedirect(req.getContextPath() + "/login.jsp");
    return;
   }
  }
  chain.doFilter(req, res);
 }

}

 

 

web.xml配置

<filter>
  <filter-name>characterfilter</filter-name>
  <filter-class>user.CharacterFilter</filter-class>
 </filter>
  
 <filter-mapping>
  <filter-name>characterfilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

 

 <servlet>
  <servlet-name>CharacterFilter</servlet-name>
  <servlet-class>checkLogin.CharacterFilter</servlet-class>
 </servlet>