【Java | ETH】web3j 调用智能合约有两种方式_web3j transactionreceipt

1、第一种：直接使用RawTrasaction进行创建

// using a raw transaction
RawTransaction rawTransaction = RawTransaction.createContractTransaction(
        <nonce>,
        <gasPrice>,
        <gasLimit>,
        <value>,
        "0x <compiled smart contract code>");
// send...
 
// get contract address
EthGetTransactionReceipt transactionReceipt =
             web3j.ethGetTransactionReceipt(transactionHash).send();
 
if (transactionReceipt.getTransactionReceipt.isPresent()) {
    String contractAddress = transactionReceipt.get().getContractAddress();
} else {
    // try again
}

2、第二种：将合约代码转换成Java Bean。

（1）首先我们需要一份写好的智能合约。

pragma solidity ^0.4.18;
 
// Example taken from http