智能合约 web3j Java_Java使用web3j调用智能合约
1.Java程序引入相關依賴，后面用于調用智能合約中的函數
org.web3j
core
5.0.0
org.web3j
codegen
5.0.0
org.fisco-bcos
solcJ
0.5.2.0
commons-io
commons-io
2.4
com.squareup.okhttp3
okhttp
4.4.0
com.squareup.okhttp3
okhttp-ws
3.4.2
2.將合約使用remix進行編譯
編譯后，復制abi、Bytecode，放入指定位置，生成abi和bin文件
@Test
void generateABIAndBIN() {
String abi = "abi復制放這里";
String bin = "bin復制過來放這里";
String abiFileName = "abi文件名.abi";
String binFileName = "bin文件名.bin";
File abiFile = new File("E:\\solidity\\xx\\xx\\"+ abiFileName);
File binFile = new File("E:\\solidity\\xx\\xx\\"+ binFileName);
if (!abiFile.getParentFile().exists()) {
boolean result = abiFile.getParentFile().mkdirs();
if (!result) {
System.out.println("創建失敗");
}
}
BufferedOutputStream abiBos = null;
BufferedOutputStream binBos = null;
try {
FileOutputStream abiFos = new FileOutputStream(abiFile);
FileOutputStream binFos = new FileOutputStream(binFile);
abiBos = new BufferedOutputStream(abiFos);
binBos = new BufferedOutputStream(binFos);
abiBos.write(abi.getBytes());
abiBos.flush();
binBos.write(bin.getBytes());
binBos.flush();
}catch (Exception e) {
throw new RuntimeException("寫入過程出現錯誤");
}finally {
if(abiBos != null) {
try {
abiBos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if(binBos != null) {
try {
binBos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
@Test
public void generateClass() throws IOException, ClassNotFoundException {
String[] args = Arrays.asList(
"-a", "D:/solidity/xx/xx.abi",
"-b", "D:/solidity/xx/xx.bin",
"-p", "top.rhynie.xx.contract",
"-o", "D:/IDEA_Project/xx/src/main/java"
).toArray(new String[0]);
Stream.of(args).forEach(System.out::println);
SolidityFunctionWrapperGenerator.main(args);
}
4.注冊infura獲取免費節點
5.java代碼調用只能合約代碼
@Test
void deployContract() throws Exception {
Web3j web3 = Web3j.build(new HttpService("https://ropsten.infura.io/v3/xxxx"));
String ownAddress = "0x119Eb8E686423E56b7cfc6F211C8CD4a9F71E3Cc";
// Credentials c = WalletUtils.loadCredentials("密碼","keystore文件地址");
Credentials credentials = Credentials.create("私鑰");
AWToken awToken = AWToken.deploy(web3, credentials, web3.ethGasPrice().send().getGasPrice(), Contract.GAS_LIMIT).send();
System.out.println(awToken.getContractAddress());
// 調用合約的函數
awToken.transfer("0x0", value);
}
總結
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