SpringBoot整合JWT實現登陸驗證的方法詳解

        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.10.3</version>
        </dependency>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.7.20</version>
        </dependency>

 .withClaim("username",user.getLoginName())   //存放資料
 .withClaim("password",user.getPassword())

package com.example.check.util;

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTCreationException;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.auth0.jwt.interfaces.Claim;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.example.check.entity.AdminLogin;

import java.util.Date;
/**
 * @author quxiang
 * @date 2021/12/30 13:53
 */
public class TokenUtil {
    private static final long EXPIRE_TIME= 60*1000;//token到期時間60s
    private static final String TOKEN_SECRET="l122adasw532df";  //金鑰鹽

    /**
     * 建立一個token
     * @param user
     * @return
     */
    public static String sign(AdminLogin user,Date expires){
        String token=null;
        try {
            token = JWT.create()
                    .withIssuer("auth0")//發行人
                    .withClaim("username",user.getLoginName())   //存放資料
                    .withClaim("password",user.getPassword())
                    .withExpiresAt(expires)//過期時間
                    .sign(Algorithm.HMAC256(TOKEN_SECRET));
        } catch (IllegalArgumentException|JWTCreationException je) {

        }
        return token;
    }


    /**
     * 對token進行驗證
     * @param token
     * @return
     */
    public static Boolean verify(String token){
        try {
            JWTVerifier jwtVerifier=JWT.require(Algorithm.HMAC256(TOKEN_SECRET)).withIssuer("auth0").build();//建立token驗證器
            DecodedJWT decodedJWT=jwtVerifier.verify(token);
            System.out.println("認證通過：");
            System.out.println("username: " + TokenUtil.getUsername(token));

            System.out.println("過期時間：    " + decodedJWT.getExpiresAt());
        } catch (IllegalArgumentException |JWTVerificationException e) {
            //丟擲錯誤即為驗證不通過
            return false;
        }
        return true;
    }

    /**
     * 獲取使用者名稱
     */
    public static String getUsername(String token)
    {
        try{
            DecodedJWT jwt=JWT.decode(token);
            return  jwt.getClaim("username").asString();
        }catch (JWTDecodeException e)
        {
            return null;
        }


    }
}

package com.example.check.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;


/**
 * 跨域設定
 */
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedHeaders("Content-Type","X-Requested-With","accept,Origin","Access-Control-Request-Method","Access-Control-Request-Headers","token")
                .allowedMethods("*")
                .allowedOriginPatterns("*")
                .allowCredentials(true);
    }
}