SpringBoot登录用户权限拦截器_Java教程

1. 创建自定义拦截器类并实现 HandlerInterceptor 接口

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									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

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									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");

									  }

									 }