這里的智能合約僅包含Init函數和Invoke函數。
為什么一定是這兩個方法？
因為在源碼中的智能合約模塊有這樣的接口，如果要完成智能合約的相關編程，就需要實現源碼中定義的接口，接口中定義了這兩個方法。空口無憑，下面我給大家看一個圖：
文件路徑：github.com/hyperledger/fabric/core/chaincode/shim
這個文件中的內容如下：
go語言
package main
import (
"github.com/hyperledger/fabric/core/chaincode/shim"
pb "github.com/hyperledger/fabric/protos/peer"
)
var logger = shim.NewLogger("example_cc0")
// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct {
}
// Init initializes the chaincode state
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
}
// Invoke makes payment of X units from A to B
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
}
func main() {
err := shim.Start(new(SimpleChaincode))
if err != nil {
logger.Errorf("Error starting Simple chaincode: %s", err)
}
}
java語言
package org.hyperledger.fabric.example; import io.netty.handler.ssl.OpenSsl; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.hyperledger.fabric.shim.ChaincodeBase; import org.hyperledger.fabric.shim.ChaincodeStub; public class SimpleChaincode extends ChaincodeBase { private static Log logger = LogFactory.getLog(SimpleChaincode.class); @Override public Response init(ChaincodeStub stub) { } @Override public Response invoke(ChaincodeStub stub) { } public static void main(String[] args) { logger.info("OpenSSL avaliable: " + OpenSsl.isAvailable()); new SimpleChaincode().start(args); } }