UniSwap 使用Web3j 生成原生币兑换代币。

val function =when(methodName){ "swapEthForExactTokens" -> {     val amountOut =map["amountOut"] as int     val address =Gson().fromJson<String>(map["address"] as JsonArray,object :TypeToken<List<String>>(){}.type).map { Address(it.toString()) }     val toAddress =map["to"] as String     val deadline =map["deadline"] as Int     Function(  methodName, listOf(Uint(amountOut.toBigInteger()), DynamicArray(address), Address(toAddress), Uint(deadline.toBigInteger())),listOf(object : TypeReference<Type<*>?>() {})) } else ->Function(methodName, listOf(Address(approveToAddress), Uint256(num.toPlainString().toBigInteger())), listOf(object : TypeReference<Type<*>?>() {}))    }    //创建RawTransaction交易对象    val rawTransaction = RawTransaction.createTransaction(nonce.toBigInteger(), gasPrice.toBigInteger(), gasLimit.toBigInteger(), contractAddress,  FunctionEncoder.encode(function))    //签名Transaction    val signMessage = TransactionEncoder.signMessage(rawTransaction,  Credentials.create(fromPrivateKey))    return Numeric.toHexString(signMessage)

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