SpringBoot登录用户权限拦截器

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");
  }
 }

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