登录认证-完成（拦截器）

//JWT令牌生成，工具类
package com.di.bigevent.utils;

import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;

import java.util.Date;
import java.util.Map;

public class JwtUtil {

    private static final String KEY = "itheima";
	
	//接收业务数据,生成token并返回
    public static String genToken(Map<String, Object> claims) {
        return JWT.create()
                .withClaim("claims", claims)
                .withExpiresAt(new Date(System.currentTimeMillis() + 1000 * 60 * 60 * 12))
                .sign(Algorithm.HMAC256(KEY));
    }

	//接收token,验证token,并返回业务数据
    public static Map<String, Object> parseToken(String token) {
        return JWT.require(Algorithm.HMAC256(KEY))
                .build()
                .verify(token)
                .getClaim("claims")
                .asMap();
    }

}

~~~

~~~java
//登录拦截器类
package com.di.bigevent.interceptors;

import com.di.bigevent.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 {
        //令牌验证
        String token = request.getHeader("Authorization");

        try{
            Map<String,Object> claims = JwtUtil.parseToken(token);
            //放行
            return true;
        }
        catch(Exception e){
            response.setStatus(401);
            //不放行
            return false;
        }
    }
}

~~~

~~~java
//配置类
package com.di.bigevent.config;

import com.di.bigevent.interceptors.LoginInterceptor;
import org.aopalliance.intercept.Interceptor;
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 LoginInterceptor loginInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
       registry.addInterceptor(loginInterceptor).excludePathPatterns("/user/login","/user/register");
    }
}