请问一下交易前算出txhash这个方法中的signeddata是怎么生成的

[EdisonChenZX]

public class Calculate {
public static void main(String[] args) {
System.out.println(calculateContractAddress("0x6c0f49aF552F2326DD851b68832730CB7b6C0DaF".toLowerCase(), 294));

	String signedData = "0xf8ac8201518506fc23ac00830493e094fda023cea60a9f421d74ac49f9a015880a77dd7280b844a9059cbb000000000000000000000000b5dbd2e4093a501f1d1e645f04cef5815a1581d7000000000000000000000000000000000000000000000004c53ecdc18a6000001ca03d710f3c5aabde2733938c44c0b1448f96e760c030205562f59889557397faa4a007110abbcfa343381a2f713d6339d3fa751200f82cc2f06a4d1967b4eaf61d50";
	System.out.println(caculateTransactionHash(signedData));
}

[TOTOROYang]

签名后的交易信息。 就是signeddata

[yangliu123]

问下如何计算签名后交易信息。能否给下代码