SpringBoot登录用户权限拦截器

深藏阁楼爱情的钟 2022-11-11 13:10 267阅读 0赞

## 1. 创建自定义拦截器类并实现 `HandlerInterceptor` 接口 ##

package com.xgf.online_mall.interceptor;
    
    import com.xgf.online_mall.system.domain.User;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.stereotype.Component;
    import org.springframework.web.servlet.HandlerInterceptor;
    import org.springframework.web.servlet.ModelAndView;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.BufferedWriter;
    import java.io.FileWriter;
    import java.nio.file.Files;
    import java.nio.file.Path;
    import java.nio.file.Paths;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.logging.SimpleFormatter;
    
    @Slf4j
    @Component
    public class UserLoginAuthInterceptor implements HandlerInterceptor { 
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 
            log.info(" ======== UserAuthInterceptor preHandle 登录权限拦截器拦截");
            User user = (User) request.getSession().getAttribute("loginUser");
            //未登录才判断，登录了直接放行
            if(user == null){ 
                //获取访问路径
                String address = request.getRequestURI();
                log.info("======== 拦截，访问路径 address : {}", address);
                response.sendRedirect(request.getContextPath() + "/login.html");
                return false;
    
                /*String address = request.getRequestURI(); log.info("======== 拦截，访问路径 address : {}", address); //不是登录或者注册页面，就直接跳转登录界面 if(!address.contains("login") && !address.contains("register")){ //强制到登录页面 response.sendRedirect(request.getContextPath() + "/login.html"); //设置为false，不访问controller return false; }*/
            }
            //其它模块或者已经登录，就直接放行
    // log.info("======== 已登录 user = {}", user);
            return true;
        }
    
    
        @Override
        public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { 
            log.info(" ===== UserAuthInterceptor postHandle");
        }
    
        @Override
        public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { 
            log.info("==== UserAuthInterceptor afterCompletion");
    
            //记录日志 向文件里面写日志
            //获取服务器记录日志log文件所存放的目录位置 -- tomcat下的真实路径+log目录
            String logdir = request.getServletContext().getRealPath("log");
            //路径不存在就创建
            Path logdirPath = Paths.get(logdir);
            if(Files.notExists(logdirPath)){ 
                Files.createDirectories(logdirPath);
            }
            //目录存在就将数据[字符]写入 //存放日志的路径+文件名
            Path logfile = Paths.get(logdir,"userlog.log");
            //logfile.toFile() paths转换为File类型 true以追加的方式写入
            BufferedWriter writer = new BufferedWriter(new FileWriter(logfile.toFile(),true));
    
            //获取登录用户信息
            User user = (User)request.getSession().getAttribute("loginUser");
            //记录user信息，存入日志
            writer.write(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + " >> " + user +"\r\n");
            writer.flush();
            writer.close();
        }
    
    }

--------------------

## 2. 创建WebMvcConfigurer接口实现类，注册并生效自定义的拦截器 ##

import com.xgf.online_mall.constant.PathConstantParam;
    import com.xgf.online_mall.interceptor.UserLoginAuthInterceptor;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
    
    import java.util.ArrayList;
    import java.util.List;
    
    @Configuration
    @Slf4j
    public class LoginConfig implements WebMvcConfigurer { 
        @Autowired
        private UserLoginAuthInterceptor userLoginAuthInterceptor;
    
        /** * addInterceptors方法设置拦截路径 * addPathPatterns：需要拦截的访问路径 * excludePathPatterns：不需要拦截的路径， * String数组类型可以写多个用","分割 * @param registry */
        @Override
        public void addInterceptors(InterceptorRegistry registry){ 
            log.info(" ======== LoginConfig.addInterceptors");
            //添加对用户未登录的拦截器，并添加排除项
            //error路径，excludePathPatterns排除访问的路径在项目中不存在的时候，
            //springboot会将路径变成 /error, 导致无法进行排除。
            registry.addInterceptor(userLoginAuthInterceptor)
                    .addPathPatterns("/**")
                    .excludePathPatterns("/js/**", "/css/**", "/img/**", "/plugins/**")
                    .excludePathPatterns("/login.html", "/register.html", "/system/user/login", "/system/user/login", "/index")
                    .excludePathPatterns("/error");
        }
    }