Jwt登录认证（拦截器）：

        使用拦截器统一验证令牌

        登录和注册接口需要放行

interceptors.LoginInterceptor：（注册一个拦截器）

package com.lin.springboot01.interceptors;

import com.lin.springboot01.pojo.Result;
import com.lin.springboot01.utils.JwtUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;

@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("Authorization");
        try {
            //能否解析成功
            Map<String, Object> claims = JwtUtil.parseToken(token);
            //放行
            return true;
        } catch (Exception e) {
            //解析失败，httpServletResponse响应码设置为401
            response.setStatus(401);
            return false;
        }
    }
}

config.WebConfig：（在config配置项中配置拦截器）

package com.lin.springboot01.config;

import com.lin.springboot01.interceptors.LoginInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private LoginInterceptor loginInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //登录接口和注册接口不拦截
        registry.addInterceptor(loginInterceptor).excludePathPatterns("/user/login","/user/register");
    }
}

controller.ArticleController

package com.lin.springboot01.controller;

import com.lin.springboot01.pojo.Result;
import com.lin.springboot01.utils.JwtUtil;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Map;

@RestController
@RequestMapping("/article")
public class ArticleController {
    @GetMapping("/list")
    public Result<String> list(/*@RequestHeader(name = "Authorization") String token, HttpServletResponse response*/){
        //验证token
      /*  try {
            Map<String, Object> claims = JwtUtil.parseToken(token); //parseToken是JwtUtil工具类里定义的解析token的方法
            return Result.success("可以展示数据");
        } catch (Exception e) {
            response.setStatus(401);
            return Result.error("未登录");
        }*/
        return Result.success("可以展示数据");
    }

}