链代码示例（1.4风格） Fabric架构版本的 区块链 实例： 如下是一个账户转账的链代码示例（1.4风格）仅供安装实例化，若您需要调测请参考Fabric官方示例中的链代码。 package main import ( "fmt" "strconv" "github.com/hyperledger/fabric/core/chaincode/shim" pb "github.com/hyperledger/fabric/protos/peer" )type SimpleChaincode struct {}// 初始化数据状态，实例化/升级链代码时被自动调用func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {// println函数的输出信息会出现在链代码容器的日志中fmt.Println("ex02 Init")// 获取用户传递给调用链代码的所需参数_, args := stub.GetFunctionAndParameters()var A, B string // 两个账户var Aval, Bval int // 两个账户的余额var err error// 检查合法性, 检查参数数量是否为4个, 如果不是, 则返回错误信息if len(args) != 4 {return shim.Error("Incorrect number of arguments. Expecting 4")}A = args[0] // 账户A用户名Aval, err = strconv.Atoi(args[1]) // 账户A余额if err != nil {return shim.Error("Expecting integer value for asset holding")}B = args[2] // 账户B用户名Bval, err = strconv.Atoi(args[3]) // 账户B余额if err != nil {return shim.Error("Expecting integer value for asset holding")}fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)// 将账户A的状态写入账本中err = stub.PutState(A, []byte(strconv.Itoa(Aval)))if err != nil {return shim.Error(err.Error())}// 将账户B的状态写入账本中err = stub.PutState(B, []byte(strconv.Itoa(Bval)))if err != nil {return shim.Error(err.Error())}return shim.Success(nil)}// 对账本数据进行操作时(query, invoke)被自动调用func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {fmt.Println("ex02 Invoke")// 获取用户传递给调用链代码的函数名称及参数function, args := stub.GetFunctionAndParameters()// 对获取到的函数名称进行判断if function == "invoke" {// 调用 invoke 函数实现转账操作return t.invoke(stub, args)} else if function == "delete" {// 调用 delete 函数实现账户注销return t.delete(stub, args)} else if function == "query" {// 调用 query 实现账户查询操作return t.query(stub, args)}// 传递的函数名出错，返回 shim.Error()return shim.Error("Invalid invoke function name. Expecting \"invoke\" \"delete\" \"query\"")}// 账户间转钱func (t *SimpleChaincode) invoke(stub shim.ChaincodeStubInterface, args []string) pb.Response {var A, B string // 账户A和Bvar Aval, Bval int // 账户余额var X int // 转账金额var err errorif len(args) != 3 {return shim.Error("Incorrect number of arguments. Expecting 3")}A = args[0] // 账户A用户名B = args[1] // 账户B用户名// 从账本中获取A的余额Avalbytes, err := stub.GetState(A)if err != nil {return shim.Error("Failed to get state")}if Avalbytes == nil {return shim.Error("Entity not found")}Aval, _ = strconv.Atoi(string(Avalbytes))// 从账本中获取B的余额Bvalbytes, err := stub.GetState(B)if err != nil {return shim.Error("Failed to get state")}if Bvalbytes == nil {return shim.Error("Entity not found")}Bval, _ = strconv.Atoi(string(Bvalbytes))// X为转账金额X, err = strconv.Atoi(args[2])if err != nil {return shim.Error("Invalid transaction amount, expecting a integer value")}// 转账Aval = Aval - XBval = Bval + Xfmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)// 更新转账后账本中A余额err = stub.PutState(A, []byte(strconv.Itoa(Aval)))if err != nil {return shim.Error(err.Error())}// 更新转账后账本中B余额err = stub.PutState(B, []byte(strconv.Itoa(Bval)))if err != nil {return shim.Error(err.Error())}return shim.Success(nil)}// 账户注销func (t *SimpleChaincode) delete(stub shim.ChaincodeStubInterface, args []string) pb.Response {if len(args) != 1 {return shim.Error("Incorrect number of arguments. Expecting 1")}A := args[0] // 账户用户名// 从账本中删除该账户状态err := stub.DelState(A)if err != nil {return shim.Error("Failed to delete state")}return shim.Success(nil)}// 账户查询func (t *SimpleChaincode) query(stub shim.ChaincodeStubInterface, args []string) pb.Response {var A stringvar err errorif len(args) != 1 {return shim.Error("Incorrect number of arguments. Expecting name of the person to query")}A = args[0] // 账户用户名// 从账本中获取该账户余额Avalbytes, err := stub.GetState(A)if err != nil {jsonResp := "{\"Error\":\"Failed to get state for " + A + "\"}"return shim.Error(jsonResp)}if Avalbytes == nil {jsonResp := "{\"Error\":\"Nil amount for " + A + "\"}"return shim.Error(jsonResp)}jsonResp := "{\"Name\":\"" + A + "\",\"Amount\":\"" + string(Avalbytes) + "\"}"fmt.Printf("Query Response:%s\n", jsonResp)// 返回转账金额return shim.Success(Avalbytes)}func main() {err := shim.Start(new(SimpleChaincode))if err != nil {fmt.Printf("Error starting Simple chaincode: %s", err)}} 父主题： Go语言链代码开发