登录权限验证

一、 自己写一个filter类

package com.ujy.filter;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest servletRequest = (HttpServletRequest)request;
        HttpServletResponse servletResponse = (HttpServletResponse)response;
        String requestURI = servletRequest.getRequestURI();
        //当前登录的用户 不拦截
        Object loginUser = servletRequest.getSession().getAttribute("loginUser");
        if (loginUser != null || requestURI.contains("static") ||requestURI.contains("code") || requestURI.contains("login") ||requestURI.endsWith("gif")) {
            //包含以上条件 ，方形
            chain.doFilter(request,response);
        }else {
            servletResponse.sendRedirect(servletRequest.getContextPath()+"/login.jsp");
        }
    }
    @Override
    public void destroy() {

    }
}

二、在web.xml里面配置

<!--   登录权限验证-->
<!--    <filter>-->
<!--        <filter-name>LoginFilter</filter-name>-->
<!--        <filter-class>com.ujy.filter.LoginFilter</filter-class>-->
<!--    </filter>-->
<!--    <filter-mapping>-->
<!--        <filter-name>LoginFilter</filter-name>-->
<!--        <url-pattern>/*</url-pattern>-->
<!--    </filter-mapping>-->