Java Implementation of Tron (TRON) Blockchain Development: Transaction Monitoring and Transfers (Part 2)

In the previous section, we covered Java-based Tron blockchain development deployment—compiling components via Trident source code, connecting to the Tron network via RPC, and creating offline wallets. This section dives into transaction monitoring and transfer functionalities using a deployed project environment.

Core Keywords

• Tron blockchain development
• Java TRON API
• Transaction monitoring
• TRC20 transfers
• TRX balance
• ApiWrapper
• Smart contract integration

1. Establishing Chain Connection (ApiWrapper)

To interact with the Tron blockchain, initialize the ApiWrapper with your private key and network configuration:

private ApiWrapper getApiWrapper(String hexPrivateKey) {
    if (tronServiceConfig.getTronDomainOnline()) {
        // Mainnet (requires API key)
        return ApiWrapper.ofMainnet(hexPrivateKey, tronServiceConfig.getApiKey());
    } else {
        // Nile testnet (no API key needed)
        return new ApiWrapper("grpc.nile.trongrid.io:50051", "grpc.nile.trongrid.io:50061", hexPrivateKey);
    }
}

Key Notes:

• Use Mainnet for production (requires Tron API key).
• Testnet (Nile) is ideal for development.

👉 Get your Tron API key here

2. Checking TRC20 Token Balances (e.g., USDT)

public BigDecimal getTrc20Balance(String address) {
    ApiWrapper client = getApiWrapper(tronServiceConfig.getHexPrivateKey());
    Contract contract = client.getContract(tronServiceConfig.getTrc20Address());
    Trc20Contract token = new Trc20Contract(contract, address, client);
    BigInteger balanceOf = token.balanceOf(address);
    BigDecimal divisor = new BigDecimal(tronServiceConfig.getTrc20Decimals());
    BigDecimal balance = new BigDecimal(balanceOf).divide(divisor, 4, RoundingMode.HALF_UP);
    client.close();
    return balance;
}

Parameters:

• address: Your wallet address.
• TRC20 contract address: Configured in tronServiceConfig.
• Decimals: Adjust for token precision (e.g., 6 for USDT).

3. Checking TRX Balance

public BigDecimal getTRxBalance(String address) {
    ApiWrapper wrapper = getApiWrapper(tronServiceConfig.getHexPrivateKey());
    Long balance = wrapper.getAccountBalance(address);
    BigDecimal divisor = new BigDecimal(tronServiceConfig.getTrc20Decimals());
    return new BigDecimal(balance).divide(divisor, 4, RoundingMode.HALF_UP);
}

Notes:

• TRX is the native cryptocurrency for fee payments.
• Balance returned in SUN (1 TRX = 1,000,000 SUN).

FAQ Section

Q1: How do I monitor incoming transactions?

A: Use ApiWrapper with event listeners or poll getTransactionById for real-time tracking.

Q2: What’s the gas fee for TRC20 transfers?

A: Typically ~10 TRX, but testnet transfers are free.

👉 Explore Tron’s gas fee structure

Q3: Can I use this for other TRC20 tokens?

A: Yes! Replace the contract address in tronServiceConfig.

Q4: How secure is the ApiWrapper connection?

A: It uses gRPC encryption—ensure your private key is stored securely.

Next Steps

• Implement transaction signing for transfers.
• Set up automated alerts for large transactions.

Pro Tip: Always test on Nile testnet before deploying to mainnet.

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