jwt生成token与解析token

1.生成token与解析token部分代码

pom

<!-- token验证 -->
        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>4.2.1</version>
        </dependency>

jwt token工具类(使用的话createToken的参数与方法体与getTokenRes的返回值需要自己看着修改)

• withAudience（）可以放用户名、账户id之类的，这样就不用查询数据库了
• withExpiresAt（）放token的过期时间，上面的表示token24小时之后过期
• sign（）放签名认证，一般是放加密后的密码

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTCreator;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.Claim;
import com.auth0.jwt.interfaces.DecodedJWT;
import org.springframework.stereotype.Component;

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

@Component("Token")
public class Token {

    /**
     * toekn 密钥
     */
    private static final String JWT_SECRET = "qiesiyv";//自己随便起个字符串
    /**
     * token 过期时间
     */
    private static final int calendarField = Calendar.DATE;
    private static final int calendarInterval = 30;

    private static final Algorithm algorithm = Algorithm.HMAC256(JWT_SECRET);

    // header Map
    private static final Map<String, Object> map = new HashMap<>();

    private static JWTCreator.Builder createTokenBuilder() {
        /** 加密方式 **/
        map.put("alg", "HS256");
        map.put("typ", "JWT");
        // 签发时间
        Date iaDate = new Date();
        // 设置过期时间
        Calendar nowTime = Calendar.getInstance();
        nowTime.add(calendarField, calendarInterval);//前者为时间单位，后者时间数量
        Date expiresDate = nowTime.getTime();
        JWTCreator.Builder builder = JWT.create().withHeader(map)
                .withIssuedAt(iaDate)
                .withExpiresAt(expiresDate)
                .withClaim("iss", "qiesiyv")  //payload iss jwt的签发者 看着起名 
                .withClaim("aud", "app");   //aud  接收的乙方	 看着起名 
        return builder;
    }

    /**
     * 生成token
     *
     * @param
     * @return
     */
    public static String createToken(String uid,String userimg,String username,String userbimg) {//token保存的数据
        JWTCreator.Builder builder = createTokenBuilder();
        String token = builder.withClaim("uid", uid)
                .withClaim("userimg", userimg)
                .withClaim("username", username)
                .withClaim("userbimg", userbimg)
                .sign(algorithm);
        return token;
    }


    // 解析
    static DecodedJWT verifyToken(String token) {
        DecodedJWT jwt = null;
        try {
            //解析方式和密钥
            JWTVerifier verifier = JWT.require(algorithm).build();
            DecodedJWT decodedJWT = JWT.decode(token);
            jwt = verifier.verify(decodedJWT);
        } catch (Exception e) {
            e.printStackTrace();
            // token 校检失败
        }
        return jwt;
    }


    /**
     * 解析token获取内容
     * @param token
     * @return
     */
    public static TokenRes getTokenRes(String token) {
        DecodedJWT jwt = verifyToken(token);
        Map<String, Claim> claimMap = jwt.getClaims();
        String uid = claimMap.get("uid").asString();//赋值返回值
        String userimg = claimMap.get("userimg").asString();
        String username = claimMap.get("username").asString();
        String userbimg = claimMap.get("userbimg").asString();
        TokenRes res = new TokenRes(uid,userimg,username,userbimg);
        return res;
    }
}

返回值类演示

@Data
@AllArgsConstructor
public class TokenRes {
    private String uid;//用户id
    private String userimg;//用户头像
    private String username;//用户名
    private String userbimg;//用户主页图
}

2.拦截规则

拦截工具类

import com.auth0.jwt.exceptions.JWTVerificationException;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

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

public class JwtInterceptor implements HandlerInterceptor {
    
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        // 从 http 请求头中取出 token
        String token = request.getHeader("token");
        System.out.println(token);
        // 如果不是映射到方法直接通过
        if(!(handler instanceof HandlerMethod)){
            return true;
        }

        if (StringUtils.isBlank(token)) {
            throw new RuntimeException("无token，请重新登录");
        }

        // 验证 token
        try {
            if(Token.verifyToken(token)==null)
                throw new RuntimeException("token无效");
            System.out.println("token校验");
        } catch (JWTVerificationException e) {
            throw new RuntimeException("token失效,请重新登录");
        }

        return true;
    }
}

拦截配置类

• addPathPatterns() 要拦截的接口
• excludePathPatterns()开放的接口

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;

/**
 * @Description: 拦截器
 */
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Bean
    public JwtInterceptor jwtInterceptor(){
        return new JwtInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(jwtInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/ceshi/ceshi","/**/import");
    }
}

原文