spring 拦截器实现token校验登录

pom文件

        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.5.0</version>
        </dependency>

生成token

import com.alibaba.fastjson.JSON;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.demo.entity.Role;

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

/**
 * @author admin
 */
public class TokenUtil {

    /**
     * token过期时间
     */
    private static final long EXPIRE_TIME = 60 * 60 * 1000;
    /**
     * token秘钥
     */
    private static final String TOKEN_SECRET = "secret";


    /**
     * 生成token，30分钟过期
     *
     * @param username  用户名
     * @param loginTime 登录时间
     * @return 生成的token
     */
    public static String sign(String username, LocalDateTime loginTime, Role role) {
        try {
            // 设置过期时间
            Date date = new Date(System.currentTimeMillis() + EXPIRE_TIME);
            // 私钥和加密算法
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            // 设置头部信息
            Map<String, Object> header = new HashMap<>(3);
            header.put("Type", "Jwt");
            header.put("alg", "HS256");
            // 返回token字符串
            return JWT.create()
                    .withHeader(header)
                    // 设置token中需要加载的用户信息
                    .withClaim("loginName", username)
                    .withClaim("loginTime", loginTime.toString())
                    .withClaim("role", JSON.toJSONString(role))
                    .withExpiresAt(date)
                    .sign(algorithm);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 检验token是否正确
     *
     * @param token 需要校验的token
     * @return 校验是否成功
     */
    public static boolean verify(String token) {
        try {
            //设置签名的加密算法：HMAC256
            Algorithm algorithm = Algorithm.HMAC256(TOKEN_SECRET);
            JWTVerifier verifier = JWT.require(algorithm).build();
            verifier.verify(token);
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

拦截器

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import com.demo.util.JsonResult;
import com.demo.util.TokenUtil;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author admin
 */
@Component
@Slf4j
public class TokenInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestMethod = "OPTIONS";
        if (StringUtils.equals(requestMethod, request.getMethod())) {
            response.setStatus(HttpServletResponse.SC_OK);
            return true;
        }
        String token = request.getHeader("Authorization");
        if (StringUtils.isNotBlank(token)) {
            if (TokenUtil.verify(token)) {
                return true;
            }
        }
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        response.setStatus(401);
        JsonResult jsonResult = JsonResult.failMessage("认证失败", 401);
        response.getWriter().append(JSON.toJSONString(jsonResult));
        return false;
    }
}

设置拦截白名单

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.ArrayList;
import java.util.List;

/**
 * @author admin
 */
@Component
public class IntercepterConfig implements WebMvcConfigurer {

    private TokenInterceptor tokenInterceptor;

    //构造方法
    public IntercepterConfig(TokenInterceptor tokenInterceptor) {
        this.tokenInterceptor = tokenInterceptor;
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        List<String> excludePath = new ArrayList<>();
        //登录
        excludePath.add("/system/*");
        registry.addInterceptor(tokenInterceptor)
                .addPathPatterns("/**")
                .excludePathPatterns(excludePath);
        //除了登陆接口其他所有接口都需要token验证
        WebMvcConfigurer.super.addInterceptors(registry);
    }
}