SpringBoot登录用户权限拦截器「建议收藏」

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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");
}
}