使用Filter AND Interceptor校验等录(全网独一份，机不可失)

说明：基于spring boot进行的校验

1.熟悉如何使用jwt令牌。（不会的看这里：带你领略JWTl令牌的魅力！！！-CSDN博客）

Filter和Interceptor共用文件：（可以仿照，根据你的实际情况）


/*
 * Copyright (c) 2020, 2023,  All rights reserved.
 *
 */
package com.itheima.controller;
 
import com.itheima.pojo.Emp;
import com.itheima.pojo.Result;
import com.itheima.service.EmpService;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
 
import java.util.HashMap;
import java.util.Map;
 
/**
 * Project: tlias-web-management - LoginController
 * Powered by scl On 2023-10-16 14:16:46
 * 描述：
 *
 * @author 孙臣龙 [1846080280@qq.com]
 * @version 1.0
 * @since 17
 */
@Slf4j
@RestController
public class LoginController {
 
    @Autowired
    private EmpService empService;
 
    @PostMapping("/login")
    public Result login(@RequestBody Emp emp) {
        log.info("员工登录：{}", emp);
        Emp e = empService.login(emp);
 
        //登录成功生成令牌，下发令牌
        if (e != null) {
            Map climas = new HashMap<>();
            climas.put("id", e.getId());
            climas.put("name", e.getName());
            climas.put("username", e.getUsername());
            String s = JwtUtils.generateJwt(climas);
            return Result.success(s);
        }
        return Result.error("用户名或密码错误");
    }
}

service层代码：


package com.itheima.service;
 
import com.itheima.pojo.Emp;
import com.itheima.pojo.PageBean;
import org.springframework.format.annotation.DateTimeFormat;
 
import java.time.LocalDate;
import java.util.List;
 
/**
 * Project: tlias-web-management - EmpService
 * Powered by scl On 2023-10-12 15:31:01
 * 描述：
 *
 * @author 孙臣龙 [1846080280@qq.com]
 * @version 1.0
 * @since 17
 */
public interface EmpService {
 
    /**
     * 用户登录
     * @param emp
     * @return
     */
    Emp login(Emp emp);
}

mapper层代码：


package com.itheima.mapper;
 
import com.itheima.pojo.Emp;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
 
import java.time.LocalDate;
import java.util.List;
 
/**
 * Project: tlias-web-management - EmpMapper
 * Powered by scl On 2023-10-12 15:29:01
 * 描述：
 *
 * @author 孙臣龙 [1846080280@qq.com]
 * @version 1.0
 * @since 17
 */
@Mapper
public interface EmpMapper {
    
 
    /**
     * 用户登录
     * @param emp
     * @return
     */
    @Select("select * from emp where username=#{username} and password=#{password}")
    Emp getByUserNameAndPwd(Emp emp);
}

Result（响应代码）：


package com.itheima.pojo;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
 
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result {
    private Integer code;//响应码，1 代表成功; 0 代表失败
    private String msg;  //响应信息 描述字符串
    private Object data; //返回的数据
 
    //增删改 成功响应
    public static Result success(){
        return new Result(1,"success",null);
    }
    //查询 成功响应
    public static Result success(Object data){
        return new Result(1,"success",data);
    }
    //失败响应
    public static Result error(String msg){
        return new Result(0,msg,null);
    }
}

2.Filter校验器：

①：首先需要在pom文件中添加依赖：


 
        
        
        <dependency>
            <groupId>io.jsonwebtokengroupId>
            <artifactId>jjwtartifactId>
            <version>0.9.1version>
        dependency>
        <dependency>
            <groupId>com.alibabagroupId>
            <artifactId>fastjsonartifactId>
            <version>1.2.62version>
        dependency>

②：创建Filter过滤器：


/*
 * Copyright (c) 2020, 2023,  All rights reserved.
 *
 */
package com.itheima.filter;
 
import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;
 
import java.io.IOException;
import java.util.Locale;
 
/**
 * Project: tlias-web-management - LoginCheckFilter
 * Powered by scl On 2023-10-17 16:30:20
 * 描述：
 *
 * @author 孙臣龙 [1846080280@qq.com]
 * @version 1.0
 * @since 17
 */
@Slf4j
@WebFilter(urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse resp= (HttpServletResponse) servletResponse;
        HttpServletRequest req= (HttpServletRequest) servletRequest;
        //获取url
        String url = req.getRequestURI().toString();
        log.info("获取的url:{}",url);
 
        //判断url中是否包含login
        if (url.contains("login")){
            filterChain.doFilter(servletRequest,servletResponse);
            return;
        }
 
        //获取请求头的内容
        String jwt = req.getHeader("token");
 
        //判断jwt令牌是否存在
        if (!StringUtils.hasLength(jwt)){
            log.info("请求头token不存在");
            Result error = Result.error("NOT_LOGIN");
            String nologin = JSONObject.toJSONString(error);
            resp.getWriter().write(nologin);
            return;
        }
 
        //解析jtw令牌
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            e.printStackTrace();
            log.info("jwt令牌解析错误,");
            Result error = Result.error("NOT_LOGIN");
            String nologin = JSONObject.toJSONString(error);
            resp.getWriter().write(nologin);
            return;
        }
 
        //jwt令牌解析成功，放行
        log.info("放行");
        filterChain.doFilter(servletRequest,servletResponse);
    }
}

3.Interceptor拦截器：

①：创建拦截器：


/*
 * Copyright (c) 2020, 2023,  All rights reserved.
 *
 */
package com.itheima.interceptor;
 
import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Result;
import com.itheima.utils.JwtUtils;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
 
/**
 * Project: tlias-web-management - LoginCheckInterceptor
 * Powered by scl On 2023-10-17 17:18:06
 * 描述：
 *
 * @author 孙臣龙 [1846080280@qq.com]
 * @version 1.0
 * @since 17
 */
@Slf4j
@Component
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override //目标资源方法运行前运行，返回true：放行，返回false：不放行
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {
 
        //获取url
        String url = req.getRequestURI().toString();
        log.info("获取的url:{}",url);
 
        //判断url中是否包含login
        if (url.contains("login")){
            return true;
        }
 
        //获取请求头的内容
        String jwt = req.getHeader("token");
 
        //判断jwt令牌是否存在
        if (!StringUtils.hasLength(jwt)){
            log.info("请求头token不存在");
            Result error = Result.error("NOT_LOGIN");
            String nologin = JSONObject.toJSONString(error);
            resp.getWriter().write(nologin);
            return false;
        }
 
        //解析jtw令牌
        try {
            JwtUtils.parseJWT(jwt);
        } catch (Exception e) {
            e.printStackTrace();
            log.info("jwt令牌解析错误,");
            Result error = Result.error("NOT_LOGIN");
            String nologin = JSONObject.toJSONString(error);
            resp.getWriter().write(nologin);
            return false;
        }
 
        //jwt令牌解析成功，放行
        log.info("放行");
        return true;
    }
 
    @Override //目标资源方法后运行
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle...");
    }
 
    @Override //最后运行
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion...");
    }
}

说明一下：有实体类代码我没有上传（需要根据你自己的数据库决定），Filter和Interceptor使用一个就可以了。

相关阅读:
【Git】Git 的基本操作 -- 详解
 expect自动化交互应用程序工具
 数据结构与算法之美-读书笔记2（时间复杂度详细分析）
Web实训项目--网页设计（附源码）
数据库DML数据操作语言
 ant-design国际化扩展新语言
 SpringBoot--redis自定义序列化配置不生效
 实战演练 | 在 MySQL 中选择除了某一列以外的所有列
 设计数据库：一条记录/一篇文章/一篇日志关联存储多张图片
 快速排序.
原文地址：https://blog.csdn.net/qq_64847107/article/details/133890578