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Update code_example.MD

tags/1.3.0^2
imuge 5 years ago
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      deploy/deploy-gateway/src/main/resources/docs/code_example.MD

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# 1. maven坐标
```java
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>sdk-client</artifactId>
<version>${ledger.version}</version>
</dependency>
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>contract-starter</artifactId>
<version>${ledger.version}</version>
</dependency>
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>crypto-classic</artifactId>
<version>${ledger.version}</version>
</dependency>
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>crypto-sm</artifactId>
<version>${ledger.version}</version>
</dependency>
```
# 2. 数据快速上链
## 2.1. 服务连接
```java
//创建服务代理
public BlockchainKeypair CLIENT_CERT = BlockchainKeyGenerator.getInstance().generate();
final String GATEWAY_IP = "127.0.0.1";
final int GATEWAY_PORT = 80;
final boolean SECURE = false;
GatewayServiceFactory serviceFactory = GatewayServiceFactory.connect(GATEWAY_IP, GATEWAY_PORT, SECURE,
CLIENT_CERT);
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
HashDigest[] ledgerHashs = service.getLedgerHashs();
// 获取当前账本Hash
HashDigest ledgerHash = ledgerHashs[0];
```
## 2.2. 用户注册
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义注册账号的 TX；
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
BlockchainKeypair user = BlockchainKeyGenerator.getInstance().generate();
txTemp.users().register(user.getIdentity());
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.3. 数据账户注册
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义注册账号的 TX；
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
BlockchainKeypair dataAccount = BlockchainKeyGenerator.getInstance().generate();
txTemp.dataAccounts().register(dataAccount.getIdentity());
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.4. 写入数据
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义注册账号的 TX；
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// --------------------------------------
// 将商品信息写入到指定的账户中；
// 对象将被序列化为 JSON 形式存储，并基于 JSON 结构建立查询索引；
String commodityDataAccount = "GGhhreGeasdfasfUUfehf9932lkae99ds66jf==";
txTemp.dataAccount(commodityDataAccount).setText("ASSET_CODE", "value1", -1);
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
String txHash = Base64Utils.encodeToUrlSafeString(prepTx.getHash().toBytes());
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.5. 查询数据
> 注：详细的查询可参考模块sdk-samples中SDK_GateWay_Query_Test_相关测试用例
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 查询区块信息；
// 区块高度；
long ledgerNumber = service.getLedger(ledgerHash).getLatestBlockHeight();
// 最新区块；
LedgerBlock latestBlock = service.getBlock(ledgerHash, ledgerNumber);
// 区块中的交易的数量；
long txCount = service.getTransactionCount(ledgerHash, latestBlock.getHash());
// 获取交易列表；
LedgerTransaction[] txList = service.getTransactions(ledgerHash, ledgerNumber, 0, 100);
// 遍历交易列表
for (LedgerTransaction ledgerTransaction : txList) {
TransactionContent txContent = ledgerTransaction.getTransactionContent();
Operation[] operations = txContent.getOperations();
if (operations != null && operations.length > 0) {
for (Operation operation : operations) {
operation = ClientResolveUtil.read(operation);
// 操作类型：数据账户注册操作
if (operation instanceof DataAccountRegisterOperation) {
DataAccountRegisterOperation daro = (DataAccountRegisterOperation) operation;
BlockchainIdentity blockchainIdentity = daro.getAccountID();
}
// 操作类型：用户注册操作
else if (operation instanceof UserRegisterOperation) {
UserRegisterOperation uro = (UserRegisterOperation) operation;
BlockchainIdentity blockchainIdentity = uro.getUserID();
}
// 操作类型：账本注册操作
else if (operation instanceof LedgerInitOperation) {
LedgerInitOperation ledgerInitOperation = (LedgerInitOperation)operation;
LedgerInitSetting ledgerInitSetting = ledgerInitOperation.getInitSetting();
ParticipantNode[] participantNodes = ledgerInitSetting.getConsensusParticipants();
}
// 操作类型：合约发布操作
else if (operation instanceof ContractCodeDeployOperation) {
ContractCodeDeployOperation ccdo = (ContractCodeDeployOperation) operation;
BlockchainIdentity blockchainIdentity = ccdo.getContractID();
}
// 操作类型：合约执行操作
else if (operation instanceof ContractEventSendOperation) {
ContractEventSendOperation ceso = (ContractEventSendOperation) operation;
}
// 操作类型：KV存储操作
else if (operation instanceof DataAccountKVSetOperation) {
DataAccountKVSetOperation.KVWriteEntry[] kvWriteEntries =
((DataAccountKVSetOperation) operation).getWriteSet();
if (kvWriteEntries != null && kvWriteEntries.length > 0) {
for (DataAccountKVSetOperation.KVWriteEntry kvWriteEntry : kvWriteEntries) {
BytesValue bytesValue = kvWriteEntry.getValue();
DataType dataType = bytesValue.getType();
Object showVal = ClientResolveUtil.readValueByBytesValue(bytesValue);
System.out.println("writeSet.key=" + kvWriteEntry.getKey());
System.out.println("writeSet.value=" + showVal);
System.out.println("writeSet.type=" + dataType);
System.out.println("writeSet.version=" + kvWriteEntry.getExpectedVersion());
}
}
}
}
}
}
// 根据交易的 hash 获得交易；注：客户端生成 PrepareTransaction 时得到交易hash；
HashDigest txHash = txList[0].getTransactionContent().getHash();
Transaction tx = service.getTransactionByContentHash(ledgerHash, txHash);
// 获取数据；
String commerceAccount = "GGhhreGeasdfasfUUfehf9932lkae99ds66jf==";
String[] objKeys = new String[] { "x001", "x002" };
TypedKVEntry[] kvData = service.getDataEntries(ledgerHash, commerceAccount, objKeys);
long payloadVersion = kvData[0].getVersion();
// 获取数据账户下所有的KV列表
TypedKVEntry[] kvDatas = service.getDataEntries(ledgerHash, commerceAccount, 0, 100);
if (kvData != null && kvData.length > 0) {
for (TypedKVEntry kvDatum : kvDatas) {
System.out.println("kvData.key=" + kvDatum.getKey());
System.out.println("kvData.version=" + kvDatum.getVersion());
System.out.println("kvData.type=" + kvDatum.getType());
System.out.println("kvData.value=" + kvDatum.getValue());
}
}
```
## 2.6. 合约发布
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义TX模板
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// 合约内容读取
byte[] contractBytes = FileUtils.readBytes(new File("CONTRACT_FILE"));
// 生成用户
BlockchainKeypair contractKeyPair = BlockchainKeyGenerator.getInstance().generate();
// 发布合约
txTemp.contracts().deploy(contractKeyPair.getIdentity(), contractBytes);
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
TransactionResponse transactionResponse = prepTx.commit();
assertTrue(transactionResponse.isSuccess());
// 打印合约地址
System.out.println(contractKeyPair.getIdentity().getAddress().toBase58());
```
## 2.7. 合约执行
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义TX模板
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// 合约地址
String contractAddress = "";
// 使用接口方式调用合约
TransferContract transferContract = txTemp.contract(contractAddress, TransferContract.class);
// 使用decode方式调用合约内部方法（create方法）
// 返回GenericValueHolder可通过get方法获取结果，但get方法需要在commit调用后执行
String address = "address";
String account = "fill account";
long money = 100000000L;
GenericValueHolder<String> result = ContractReturnValue.decode(transferContract.create(address, account, money));
PreparedTransaction ptx = txTemp.prepare();
ptx.sign(CLIENT_CERT);
TransactionResponse transactionResponse = ptx.commit();
String cotractExecResult = result.get();
// TransactionResponse也提供了可供查询结果的接口
OperationResult[] operationResults = transactionResponse.getOperationResults();
// 通过OperationResult获取结果
for (int i = 0; i < operationResults.length; i++) {
OperationResult opResult = operationResults[i];
System.out.printf("Operation[%s].result = %s \r\n",
opResult.getIndex(), BytesValueEncoding.decode(opResult.getResult()));
}
```
## 2.8. 事件账户注册
```java
BlockchainService service = serviceFactory.getBlockchainService();
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
BlockchainKeypair eventAccount = BlockchainKeyGenerator.getInstance().generate();
txTemp.eventAccounts().register(eventAccount.getIdentity());
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.9. 事件发布
```java
BlockchainService service = serviceFactory.getBlockchainService();
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// 发布事件到指定的账户中；
String eventAccount = "GGhhreGeasdfasfUUfehf9932lkae99ds66jf==";
txTemp.eventAccount(eventAccount).publish("event_name", "string", -1)
.publish("event_name", 0, 0)
.publish("event_name", "bytes".getBytes(), 1);
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.10. 事件监听
- 系统事件
> 目前仅支持新区块产生事件
```java
EventListenerHandle<UserEventPoint> handler = blockchainService.monitorUserEvent(ledgerHash, eventAccount.getAddress().toBase58(), eventName, 0, new UserEventListener<UserEventPoint>() {
@Override
public void onEvent(Event eventMessage, EventContext<UserEventPoint> eventContext) {
BytesValue content = eventMessage.getContent();
switch (content.getType()) {
case TEXT:
case XML:
case JSON:
System.out.println(content.getBytes().toUTF8String());
break;
case INT64:
case TIMESTAMP:
System.out.println(BytesUtils.toLong(content.getBytes().toBytes()));
break;
default:
break;
}
// 关闭监听的两种方式：1
eventContext.getHandle().cancel();
}
});
// 关闭监听的两种方式：2
handler.cancel();
```
- 用户自定义事件
```java
EventListenerHandle<SystemEventPoint> handler = blockchainService.monitorSystemEvent(ledgerHash, SystemEvent.NEW_BLOCK_CREATED, 0, new SystemEventListener<SystemEventPoint>() {
@Override
public void onEvents(Event[] eventMessages, EventContext<SystemEventPoint> eventContext) {
for (Event eventMessage : eventMessages) {
BytesValue content = eventMessage.getContent();
// content中存放的是当前链上最新高度
System.out.println(BytesUtils.toLong(content.getBytes().toBytes()));
}
// 关闭监听的两种方式：1
eventContext.getHandle().cancel();
}
});
// 关闭监听的两种方式：2
handler.cancel();
# 1. maven坐标
```java
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>sdk-client</artifactId>
<version>${ledger.version}</version>
</dependency>
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>contract-starter</artifactId>
<version>${ledger.version}</version>
</dependency>
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>crypto-classic</artifactId>
<version>${ledger.version}</version>
</dependency>
<dependency>
<groupId>com.jd.blockchain</groupId>
<artifactId>crypto-sm</artifactId>
<version>${ledger.version}</version>
</dependency>
```
# 2. 数据快速上链
## 2.1. 服务连接
```java
//创建服务代理
public BlockchainKeypair CLIENT_CERT = BlockchainKeyGenerator.getInstance().generate();
final String GATEWAY_IP = "127.0.0.1";
final int GATEWAY_PORT = 80;
final boolean SECURE = false;
GatewayServiceFactory serviceFactory = GatewayServiceFactory.connect(GATEWAY_IP, GATEWAY_PORT, SECURE,
CLIENT_CERT);
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
HashDigest[] ledgerHashs = service.getLedgerHashs();
// 获取当前账本Hash
HashDigest ledgerHash = ledgerHashs[0];
```
## 2.2. 用户注册
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义注册账号的 TX；
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
BlockchainKeypair user = BlockchainKeyGenerator.getInstance().generate();
txTemp.users().register(user.getIdentity());
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.3. 数据账户注册
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义注册账号的 TX；
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
BlockchainKeypair dataAccount = BlockchainKeyGenerator.getInstance().generate();
txTemp.dataAccounts().register(dataAccount.getIdentity());
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.4. 写入数据
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义注册账号的 TX；
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// --------------------------------------
// 将商品信息写入到指定的账户中；
// 对象将被序列化为 JSON 形式存储，并基于 JSON 结构建立查询索引；
String commodityDataAccount = "GGhhreGeasdfasfUUfehf9932lkae99ds66jf==";
txTemp.dataAccount(commodityDataAccount).setText("ASSET_CODE", "value1", -1);
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
String txHash = Base64Utils.encodeToUrlSafeString(prepTx.getHash().toBytes());
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.5. 查询数据
> 注：详细的查询可参考模块sdk-samples中SDK_GateWay_Query_Test_相关测试用例
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 查询区块信息；
// 区块高度；
long ledgerNumber = service.getLedger(ledgerHash).getLatestBlockHeight();
// 最新区块；
LedgerBlock latestBlock = service.getBlock(ledgerHash, ledgerNumber);
// 区块中的交易的数量；
long txCount = service.getTransactionCount(ledgerHash, latestBlock.getHash());
// 获取交易列表；
LedgerTransaction[] txList = service.getTransactions(ledgerHash, ledgerNumber, 0, 100);
// 遍历交易列表
for (LedgerTransaction ledgerTransaction : txList) {
TransactionContent txContent = ledgerTransaction.getTransactionContent();
Operation[] operations = txContent.getOperations();
if (operations != null && operations.length > 0) {
for (Operation operation : operations) {
operation = ClientResolveUtil.read(operation);
// 操作类型：数据账户注册操作
if (operation instanceof DataAccountRegisterOperation) {
DataAccountRegisterOperation daro = (DataAccountRegisterOperation) operation;
BlockchainIdentity blockchainIdentity = daro.getAccountID();
}
// 操作类型：用户注册操作
else if (operation instanceof UserRegisterOperation) {
UserRegisterOperation uro = (UserRegisterOperation) operation;
BlockchainIdentity blockchainIdentity = uro.getUserID();
}
// 操作类型：账本注册操作
else if (operation instanceof LedgerInitOperation) {
LedgerInitOperation ledgerInitOperation = (LedgerInitOperation)operation;
LedgerInitSetting ledgerInitSetting = ledgerInitOperation.getInitSetting();
ParticipantNode[] participantNodes = ledgerInitSetting.getConsensusParticipants();
}
// 操作类型：合约发布操作
else if (operation instanceof ContractCodeDeployOperation) {
ContractCodeDeployOperation ccdo = (ContractCodeDeployOperation) operation;
BlockchainIdentity blockchainIdentity = ccdo.getContractID();
}
// 操作类型：合约执行操作
else if (operation instanceof ContractEventSendOperation) {
ContractEventSendOperation ceso = (ContractEventSendOperation) operation;
}
// 操作类型：KV存储操作
else if (operation instanceof DataAccountKVSetOperation) {
DataAccountKVSetOperation.KVWriteEntry[] kvWriteEntries =
((DataAccountKVSetOperation) operation).getWriteSet();
if (kvWriteEntries != null && kvWriteEntries.length > 0) {
for (DataAccountKVSetOperation.KVWriteEntry kvWriteEntry : kvWriteEntries) {
BytesValue bytesValue = kvWriteEntry.getValue();
DataType dataType = bytesValue.getType();
Object showVal = ClientResolveUtil.readValueByBytesValue(bytesValue);
System.out.println("writeSet.key=" + kvWriteEntry.getKey());
System.out.println("writeSet.value=" + showVal);
System.out.println("writeSet.type=" + dataType);
System.out.println("writeSet.version=" + kvWriteEntry.getExpectedVersion());
}
}
}
}
}
}
// 根据交易的 hash 获得交易；注：客户端生成 PrepareTransaction 时得到交易hash；
HashDigest txHash = txList[0].getTransactionContent().getHash();
Transaction tx = service.getTransactionByContentHash(ledgerHash, txHash);
// 获取数据；
String commerceAccount = "GGhhreGeasdfasfUUfehf9932lkae99ds66jf==";
String[] objKeys = new String[] { "x001", "x002" };
TypedKVEntry[] kvData = service.getDataEntries(ledgerHash, commerceAccount, objKeys);
long payloadVersion = kvData[0].getVersion();
// 获取数据账户下所有的KV列表
TypedKVEntry[] kvDatas = service.getDataEntries(ledgerHash, commerceAccount, 0, 100);
if (kvData != null && kvData.length > 0) {
for (TypedKVEntry kvDatum : kvDatas) {
System.out.println("kvData.key=" + kvDatum.getKey());
System.out.println("kvData.version=" + kvDatum.getVersion());
System.out.println("kvData.type=" + kvDatum.getType());
System.out.println("kvData.value=" + kvDatum.getValue());
}
}
```
## 2.6. 合约发布
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义TX模板
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// 合约内容读取
byte[] contractBytes = FileUtils.readBytes(new File("CONTRACT_FILE"));
// 生成用户
BlockchainKeypair contractKeyPair = BlockchainKeyGenerator.getInstance().generate();
// 发布合约
txTemp.contracts().deploy(contractKeyPair.getIdentity(), contractBytes);
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
TransactionResponse transactionResponse = prepTx.commit();
assertTrue(transactionResponse.isSuccess());
// 打印合约地址
System.out.println(contractKeyPair.getIdentity().getAddress().toBase58());
```
## 2.7. 合约执行
```java
// 创建服务代理；
BlockchainService service = serviceFactory.getBlockchainService();
// 在本地定义TX模板
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// 合约地址
String contractAddress = "";
// 使用接口方式调用合约
TransferContract transferContract = txTemp.contract(contractAddress, TransferContract.class);
// 使用decode方式调用合约内部方法（create方法）
// 返回GenericValueHolder可通过get方法获取结果，但get方法需要在commit调用后执行
String address = "address";
String account = "fill account";
long money = 100000000L;
GenericValueHolder<String> result = ContractReturnValue.decode(transferContract.create(address, account, money));
PreparedTransaction ptx = txTemp.prepare();
ptx.sign(CLIENT_CERT);
TransactionResponse transactionResponse = ptx.commit();
String cotractExecResult = result.get();
// TransactionResponse也提供了可供查询结果的接口
OperationResult[] operationResults = transactionResponse.getOperationResults();
// 通过OperationResult获取结果
for (int i = 0; i < operationResults.length; i++) {
OperationResult opResult = operationResults[i];
System.out.printf("Operation[%s].result = %s \r\n",
opResult.getIndex(), BytesValueEncoding.decode(opResult.getResult()));
}
```
## 2.8. 事件账户注册
```java
BlockchainService service = serviceFactory.getBlockchainService();
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
BlockchainKeypair eventAccount = BlockchainKeyGenerator.getInstance().generate();
txTemp.eventAccounts().register(eventAccount.getIdentity());
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.9. 事件发布
```java
BlockchainService service = serviceFactory.getBlockchainService();
TransactionTemplate txTemp = service.newTransaction(ledgerHash);
// 发布事件到指定的账户中；
String eventAccount = "GGhhreGeasdfasfUUfehf9932lkae99ds66jf==";
txTemp.eventAccount(eventAccount).publish("event_name", "string", -1)
.publish("event_name", 0, 0)
.publish("event_name", "bytes".getBytes(), 1);
// TX 准备就绪；
PreparedTransaction prepTx = txTemp.prepare();
// 使用私钥进行签名；
prepTx.sign(CLIENT_CERT);
// 提交交易；
prepTx.commit();
```
## 2.10. 事件监听
- 系统事件
> 目前仅支持新区块产生事件
```java
EventListenerHandle<SystemEventPoint> handler = blockchainService.monitorSystemEvent(ledgerHash, SystemEvent.NEW_BLOCK_CREATED, 0, new SystemEventListener<SystemEventPoint>() {
@Override
public void onEvents(Event[] eventMessages, EventContext<SystemEventPoint> eventContext) {
for (Event eventMessage : eventMessages) {
BytesValue content = eventMessage.getContent();
// content中存放的是当前链上最新高度
System.out.println(BytesUtils.toLong(content.getBytes().toBytes()));
}
// 关闭监听的两种方式：1
eventContext.getHandle().cancel();
}
});
// 关闭监听的两种方式：2
handler.cancel();
```
- 用户自定义事件
```java
EventListenerHandle<UserEventPoint> handler = blockchainService.monitorUserEvent(ledgerHash, eventAccount.getAddress().toBase58(), eventName, 0, new UserEventListener<UserEventPoint>() {
@Override
public void onEvent(Event eventMessage, EventContext<UserEventPoint> eventContext) {
BytesValue content = eventMessage.getContent();
switch (content.getType()) {
case TEXT:
case XML:
case JSON:
System.out.println(content.getBytes().toUTF8String());
break;
case INT64:
case TIMESTAMP:
System.out.println(BytesUtils.toLong(content.getBytes().toBytes()));
break;
default:
break;
}
// 关闭监听的两种方式：1
eventContext.getHandle().cancel();
}
});
// 关闭监听的两种方式：2
handler.cancel();
```

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