package main

import (
    "encoding/binary"
    "net"
)

func main() {
    var tcpAddr *net.TCPAddr
    tcpAddr,_ = net.ResolveTCPAddr("tcp","127.0.0.1:9600")
    conn,_ := net.DialTCP("tcp",nil,tcpAddr)
    defer conn.Close()
    sendEasyswooleMsg(conn)
}

func sendEasyswooleMsg(conn *net.TCPConn) {
    var sendData []byte
    data := `{"command":1,"request":{"serviceName":"UserService","action":"register","arg":{"args1":"args1","args2":"args2"}}}`
    b := []byte(data)
    // 大端字节序(网络字节序)大端就是将高位字节放到内存的低地址端，低位字节放到高地址端。
    // 网络传输中(比如TCP/IP)低地址端(高位字节)放在流的开始，对于2个字节的字符串(AB)，传输顺序为：A(0-7bit)、B(8-15bit)。
    sendData = int32ToBytes8(int32(len(data)))
    // 将数据byte拼装到sendData的后面
    for _, value := range b {
        sendData = append(sendData, value)
    }
    conn.Write(sendData)
}

func int32ToBytes8(n int32) []byte {
    var buf = make([]byte, 4)
    binary.BigEndian.PutUint32(buf, uint32(n))
    return buf
}