SpringBoot--token校验登录

生成token工具类

package com.eccom.asset.utils;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;

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

/**
 * @author 一只小海猪
 * * @date 2022/8/4
 * Jwt工具类
 */
public class JwtUtil {
    /**
     * 过期5分钟
     * */
    private static final long EXPIRE_TIME = 5 * 60 * 1000;

    /**
     * jwt密钥
     * */
    private static final String SECRET = "jwt_secret";

    /**
     * 生成jwt字符串，五分钟后过期  JWT(json web token)
     * @param userCode
     * @param info,Map的value只能存放值的类型为：Map，List，Boolean，Integer，Long，Double，String and Date
     * @return
     * */
    public static String sign(String userCode, Map<String, Object> info) {
        try {
            Date date = new Date(System.currentTimeMillis() + EXPIRE_TIME);
            Algorithm algorithm = Algorithm.HMAC256(SECRET);
            String token = JWT.create()
                    //将userCode保存到token里面
                    .withAudience(userCode)
                    //存放自定义数据
                    .withClaim("info", info)
                    //五分钟后token过期
                    .withExpiresAt(date)
                    //token的密钥
                    .sign(algorithm);
            return token;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 根据token获取usercode
     * @param token
     * @return
     * */
    public static String getUserCode(String token) {
        try {
            String userCode = JWT.decode(token).getAudience().get(0);
            return userCode;
        }catch (JWTDecodeException e) {
            return null;
        }
    }

    /**
     * 根据token获取自定义数据info
     * @param token
     * @return
     * */
    public static Map<String, Object> getInfo(String token) {
        try {
            return JWT.decode(token).getClaim("info").asMap();
        }catch (JWTDecodeException e) {
            return null;
        }
    }

    /**
     * 校验token
     * @param token
     * @return
     * */
    public static boolean checkSign(String token) {
        try {
            Algorithm algorithm  = Algorithm.HMAC256(SECRET);
            JWTVerifier verifier = JWT.require(algorithm)
                    //.withClaim("username, username)
                    .build();
            verifier.verify(token);
            return true;
        }catch (JWTVerificationException e) {
            throw new RuntimeException("token 无效，请重新获取");
        }
    }
    /*
    测试token校验登录
     */
    public static void main(String[] args) {
        Map<String, Object> info = new HashMap<>();
        info.put("userCode","admin");
        info.put("password","123456");
        String token = sign("admin",info);
        System.out.println(token);
        System.out.println(getUserCode(token));
        System.out.println(getInfo(token));
        System.out.println(checkSign(token));
    }
}

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登录拦截器

package com.eccom.asset.interceptor;

import com.eccom.asset.utils.JwtUtil;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;

/**
 * @author 一只小海猪
 * * @date 2022/8/4
 * Jwt登录拦截器
 */
public class JwtInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //如果不是映射到方法直接通过
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

        //从 http 请求头中取出 token
        String token = request.getHeader("token");
        System.out.println("此处测试是否拿到了token：" + token);

        if (token == null) {
            throw new RuntimeException("无 token ，请重新登陆");
        }

        //验证 token
        JwtUtil.checkSign(token);

        //验证通过后， 这里测试取出JWT中存放的数据
        //获取 token 中的 userCode
        String userCode= JwtUtil.getUserCode(token);
        System.out.println("userCode： " + userCode);

        //获取 token 中的其他数据
        Map<String, Object> info = JwtUtil.getInfo(token);
        info.forEach((k, v) -> System.out.println(k + ":" + v));
        return true;
    }
}

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MVC配置类

package com.eccom.asset.config;

import com.eccom.asset.interceptor.JwtInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @author 一只小海猪
 * * @date 2022/8/4
 */

@Configuration
public class MvcConfig implements WebMvcConfigurer {

    /**
     * 添加jwt拦截器，并指定拦截路径
     * */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(jwtInterceptor()).addPathPatterns("/login/**");
    }

    /**
     * jwt拦截器
     * */
    @Bean
    public JwtInterceptor jwtInterceptor() {
        return new JwtInterceptor();
    }
}

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经过这么拦截之后，登录路径就会进行拦截，对用户密码，账号，token进行验证，之后整个项目都需要对用户进行验证，通过后才可以访问后面资源。

token依赖

        <!--token验证-->
        <!-- 引入操作JWT的相关依赖 -->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>4.0.0</version>
        </dependency>
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