【React工作记录一百零五】springBoot和vue实现登录操作和JWT验证（2）

package com.itheima.utils;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.util.Date;
import java.util.Map;
public class JwtUtils {
    private static String signKey="itheima";
    private static long expire=0L;
    public static String generateJwt(Map<String,Object> claims){
        String jwt= Jwts.builder().addClaims(claims).signWith(SignatureAlgorithm.HS256,signKey)
                .setExpiration(new Date(System.currentTimeMillis()+expire)).compact();
        return jwt;
    }
    public  static Claims parseJWT(String jwt){
        Claims claims=Jwts.parser().setSigningKey(signKey).parseClaimsJwt(jwt).getBody();
        return claims;
    }
}

package com.itheima.interceptor;
import com.alibaba.fastjson.JSONObject;
import com.itheima.utils.JwtUtils;
import com.itheima.pojo.Result;
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;
@Component
@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {
        System.out.println("preHandle");
        String url=req.getRequestURL().toString();
    log.info("请求url",url);
       if(url.contains("login")){
           return true;
       }
        String jwt=req.getHeader("token");
        log.info("jwt",jwt);
       try {
           JwtUtils.parseJWT(jwt);
       }catch (Exception e){
           if(!StringUtils.hasLength(jwt)){
               Result error=Result.error("NOT_LOGIN");
               String notLogin= JSONObject.toJSONString(error);
               resp.getWriter().write(notLogin);
               return false;
           }
       }
       log.info("放行");
       return true;
    }
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
    }
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}

package com.itheima.config;
import com.itheima.interceptor.LoginCheckInterceptor;
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;
@Configuration
public class webConfig implements WebMvcConfigurer {
    @Autowired
    private LoginCheckInterceptor loginCheckInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginCheckInterceptor).addPathPatterns("/**").
                excludePathPatterns("/login");
    }
}