web.xml 配置
login com.yongjie.Zlxypt.util.FileLogin login /jsp/*
2.代码实现:
package com.yongjie.Zlxypt.util;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 FileLogin implements Filter{@Overridepublic void destroy() {}@Overridepublic void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {//转换成httpHttpServletRequest request = (HttpServletRequest)req;HttpServletResponse response = (HttpServletResponse)res;//获取session 对象HttpSession session = request.getSession(true);Object obj = session.getAttribute(SystemConstant.SYSTEM_SESSION_NAME);if(obj == null){response.sendRedirect(request.getContextPath()+SystemConstant.SYSTEM_LOGIN_JSP);}else{chain.doFilter(request, response);}}@Overridepublic void init(FilterConfig config) throws ServletException {}}转载于:https://blog.51cto.com/zhuws/1969504
