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20 java如何调用solana合约

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java如何调用solana合约，有例子吗

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分类：Solana

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3 个回答

King 2024-10-30 10:15

可以用sol4k或solanaj实现，仓库里有具体的例子:

https://github.com/sol4k/sol4k
https://github.com/skynetcap/solanaj

# 例如 sol4k使用方法

## Maven:

```xml
<dependency>
    <groupId>org.sol4k</groupId>
    <artifactId>sol4k</artifactId>
    <version>0.5.3</version>
</dependency>
```
        
## How to use

Create a connection, request the latest blockhash, and submit a SOL transfer transaction from one account to another

```java
val connection = Connection(RpcUrl.DEVNET)
val blockhash = connection.getLatestBlockhash()
val sender = Keypair.fromSecretKey(secretKeyBytes)
val receiver = PublicKey("DxPv2QMA5cWR5Xfg7tXr5YtJ1EEStg5Kiag9HhkY1mSx")
val instruction = TransferInstruction(sender.publicKey, receiver, lamports = 1000)
val message = TransactionMessage.newMessage(sender.publicKey, blockhash, instruction)
val transaction = VersionedTransaction(message)
transaction.sign(sender)
val signature = connection.sendTransaction(transaction)
Check the sol4k-examples repository to find ready-to-use Java examples of sol4k APIs.
```

没那么简单 2024-10-30 13:03

ETH_YYDS 2024-11-28 14:28

```
<dependency>
    <groupId>com.mmorrell</groupId>
    <artifactId>solanaj</artifactId>
    <version>1.19.2</version>
</dependency>

```
```java
	public static String SECRET_KEY = "";
	public static RpcClient SOL_RPC_CLIENT = null;

@BeforeAll
	public static void readTradeAccountSecretKey() {
		SOL_RPC_CLIENT = new RpcClient(Cluster.MAINNET);
		String skPath = "/Users/xxx/.config/solana/id.json";
		try (BufferedReader reader = new BufferedReader(new FileReader(skPath))) {
			String line;
			while ((line = reader.readLine()) != null) {
				SECRET_KEY = line;
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void testTransfer() throws RpcException {
		PublicKey toPublickKey = new PublicKey("");
		int lamports = 3000;
		Account signer = Account.fromJson(SECRET_KEY);
		
		log.info(signer.getPublicKey().toString());
		Transaction transaction = new Transaction();
		transaction.addInstruction(SystemProgram.transfer(signer.getPublicKey(), toPublickKey, lamports));
		String signature = SOL_RPC_CLIENT.getApi().sendTransaction(transaction, signer);
		log.info(signature);
	}

```