Version 1.0.0
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The following describes the basic blockchain interaction functions of the Java SDK and defines relevant data structures.
Please use the following methods to initialize OntSDK before launching JAVA SDK.
OntSdk wm = OntSdk.getInstance();
wm.setRpc(rpcUrl);
wm.setRestful(restUrl);
wm.setDefaultConnect(wm.getRestful());
wm.openWalletFile("OntAssetDemo.json");
Note: setRestful indicates that the connection is established using the restful interface, and setRpc indicates that the connection is established using the rpc interface. setDefaultConnect is used to set this as the default connection method.
Get the current block height
int height = ontSdk.getConnectMgr().getBlockHeight();
Get block
Get block by block height
Block block = ontSdk.getConnect().getBlock(9757);
Get block by block hash
Block block = ontSdk.getConnect().getBlock(blockhash);
Get block json
Get block by block height
Object block = ontSdk.getConnect().getBlockJson(9757);
Get block by block hash
Object block = ontSdk.getConnect().getBlockJson(blockhash);
Get contract code
Get contract code by contract hash
Object contract = ontSdk.getConnect().getContract(contractHash)
Get contract json by contract hash
Object contractJson = ontSdk.getConnect().getContractJson(hash)
Get balance
Object balance = ontSdk.getConnect().getBalance(address)
Get blockchain node count
ontSdk.getConnect().getNodeCount();
Get block height
int blockheight = ontSdk.getConnect().getBlockHeight()
Get smartcontract event
Get smartcontract event by block height
Object event = ontSdk.getConnect().getSmartCodeEvent(height)
Get smartcontract event by transaction hash
Object event = ontSdk.getConnect().getSmartCodeEvent(hash)
Get block height by transaction hash
int blockheight = ontSdk.getConnect().getBlockHeightByTxHash(txhash)
Get data stored in smart contract by key
String value = ontSdk.getConnect().getStorage(codehash,key)
Get merkle proof
Object proof = ontSdk.getConnect().getMerkleProof(String hash)
Get transaction
Transaction info = ontSdk.getConnect().getTransaction(hash);
Get transaction json by transaction hash
Object info = ontSdk.getConnect().getTransactionJson(txhash);
Get InvokeTransaction
InvokeCodeTransaction t = (InvokeCodeTransaction) ontSdk.getConnect().getTransaction(hash);
Block
| Field | Type | Description |
|---|---|---|
| version | int | Version |
| prevBlockHash | UInt256 | Scripthash of the previous block |
| transactionsRoot | UInt256 | Merkel root of all the transactions in the block |
| blockRoot | UInt256 | Block root |
| timestamp | int | Block time stamp, unix time stamp |
| height | int | Block height |
| consensusData | long | Consensus data |
| consensusPayload | byte[] | Consensus payload |
| nextBookKeeper | UInt160 | Bookkeeping contract scripthash of the next block |
| sigData | array | Signature |
| bookKeepers | array | Bookkeepers |
| hash | UInt256 | Hash value of the block |
| transactions | Transaction[] | Transaction list in the block |
Transaction
| Field | Type | Description |
|---|---|---|
| version | int | Version |
| txType | TransactionType | Transaction type |
| nonce | int | Random number |
| attributes | Attribute[] | Transaction attribute list |
| gasPrice | long | Gas price |
| gasLimit | long | Gas limit |
| payer | Address | Account used to pay fee |
| sigs | Sign[] | Signature array |
| payload | Payload | Payload |
Transaction type
| Value | Type | Description |
|---|---|---|
| 208 | int | Smart contract deployment |
| 209 | int | Smart contract invocation |
| 0 | int | Bookkeeping |
| 4 | int | Enrollment |
| 5 | int | Vote |
Signature area
| Field | Type | Description |
|---|---|---|
| pubKeys | array | Public key array |
| M | int | M |
| sigData | array | Signature value array |
Fee
| Field | Type | Description |
|---|---|---|
| amount | long | Amount |
| payer | UInt160 | Payer |
Attribute
| Field | Type | Description |
|---|---|---|
| usage | AttributeUsage | Usage |
| data | byte[] | Attribute value |
TransactionAttributeUsage
| Value | Type | Description |
|---|---|---|
| 0 | int | Nonce |
| 32 | int | Script |
| 129 | int | DescriptionUrl |
| 144 | int | Description |