21，拦截器interceptors，配置注册拦截器，登录成功验证整合JWT

package com.jinhei.interceptors;
import com.jinhei.utils.JwtUtils;
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 {
        //请求头里面拿到令牌，令牌验证
        String token = request.getHeader("Authorization");
        // 验证token
        try {
            Map<String, Object> claims = JwtUtils.parseJWT(token);
            // 放行
            return true;
        } catch (Exception e) {
            // HTTP响应码 401
            response.setStatus(401);
            // 不放行
            return false;
        }
    }
}
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package com.jinhei.config;

import com.jinhei.interceptors.LoginInterceptor;
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;
//配置类注解
@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private LoginInterceptor loginInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 注册拦截器，登录接口和注册接口不拦截
        registry.addInterceptor(loginInterceptor)
                .excludePathPatterns("/user/login","/user/register");
    }
}
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