JWT token生成传递和解析的案例（kotlin）

Myth丶恋晨 2022-09-09 00:05 232阅读 0赞

JWT 做token的校验，非常的方便，具体作用可以google查一下，这里只记录怎么使用  
**1、引入jwt的依赖**

/**
         * java-jwt
         */
        implementation("com.auth0:java-jwt:3.18.1")

**2、编写JWT的工具类**

@Component
    @Slf4j
    class JwtUtil(val jwtProperties: JwtProperties){ 
    
    	open fun validateToken(authToken: String?): Boolean { 
    		val algorithm: Algorithm = Algorithm.HMAC512(jwtProperties.secret)
    		val verifier = JWT.require(algorithm).build()
    		try { 
    			verifier.verify(authToken)
    			return true
    		} catch (e: JWTVerificationException) { 
    			log.warn("Invalid signature/claims :: {}", e.message)
    		}
    		return false
    	}
    
    	open fun extractUserFromJwt(token: String): Map<String?, Claim?>? { 
    		val token = if (token.startsWith("Bearer ")) token.substring(7) else token
    		val verificationSucceeded =
    			validateToken(token)
    		if (!verificationSucceeded) { 
    			throw Exception("Token was unauthorized")
    		}
    		try { 
    			val jwt = JWT.decode(token)
    			return jwt.claims
    		} catch (e: JWTDecodeException) { 
    			log.error("Failed to decode token", e)
    		}
    		return null
    	}
    }

@Component
    @ConfigurationProperties(prefix="jwt")
    data class JwtProperties (
     var header: String?=null,
     var tokenHead: String?=null,
     var secret: String?=null,
     var expirationInMs: Long?=null
    )

jwt:
      header: "Authorization"
      tokenHead: "Bearer "
      secret: XXXXXXXX
      expirationInMs: 22133

**3、JWT的使用**

open class AliPayController (
    	val alipayTemplate: AlipayTemplate,
    	val platformOrderService:IPlatformOrderService,
    	val jwtUtil: JwtUtil
    	){ 
    open fun payOrder(@RequestBody aliPayVo: AliPayVo,@RequestHeader("Authorization") token: String): String? { 
    val platformOrder = PlatformOrder()
    platformOrder.tenantId = jwtUtil.extractUserFromJwt(token)!!["tenantId"]!!.asLong()
    platformOrder.fromUserId = jwtUtil.extractUserFromJwt(token)!!["userId"]!!.asLong()
    }
    }