go 客户端和服务端使用Json 使用结构体交互（内涵JSON彩蛋）

go 客户端和服务端使用Json 使用结构体交互

大家在学习和工作中时常要通过网络通信传输一些数据而这写数据往往是以结构体的类型进行传输，直接使用socket传输又非常之头痛，今天分享一下使用Json传输结构体指针变量

demo

service端

package main

import (

        "encoding/json"
        "flag"
        "fmt"
        "net"
        "os"
)
type PortProps struct {
        Name        *string    `thrift:"name,1" db:"name" json:"name,omitempty"`
        Type        *string    `thrift:"type,2" db:"type" json:"type,omitempty"`
        ExtOpts map[string]string `thrift:"ext_opts,20" db:"ext_opts" json:"ext_opts,omitempty"`
}
type AllProps struct {

        First_Para *string `thrift:"first_para,1"  db:"first_para"  json:"first_para,omitempty"`
        Port  *PortProps   `thrift:"port,3"   db:"port"    json:"port,omitempty"`
}

var host = flag.String("host", "", "host")
var port = flag.String("port", "3333", "port")


func main() {
        flag.Parse()
        var l net.Listener
        fmt.Println("The service has started listening")
        var err error
        l, err = net.Listen("tcp", *host+":"+*port)
        if err != nil {
                fmt.Println("Error listening:", err)
                os.Exit(1)
        }
        defer l.Close()
        fmt.Println("Listening on " + *host + ":" + *port)
        for {
                conn, err := l.Accept()
                if err != nil {
                        fmt.Println("Error accepting: ", err)
                        os.Exit(1)
                }
                fmt.Printf("Received message %s -> %s \n", conn.RemoteAddr(), conn.LocalAddr())
                // Handle connections in a new goroutine.
                go handleRequest(conn)
        }
}

func handleRequest(conn net.Conn) {
        defer conn.Close()
        for {
                json_message := make([]byte, 1024)
                n, err := conn.Read(json_message)
                if err != nil {
                        break
                }
                var allprops *AllProps = new(AllProps)
                fmt.Println(string(json_message[:n]))
                //json.Unmarshal(json_message,allprops) is error
                err2 := json.Unmarshal(json_message[:n], allprops)
                if err != nil {
                        fmt.Println(err2)
                }
                fmt.Print(string(json_message[:n]))
                _, e := conn.Write([]byte(json_message[:n]))
                if e != nil {
                        fmt.Println("Error to send message because of ", e.Error())
                        break
                }
                fmt.Println()
        }
}

client 端

package main
import (
        "flag"
        "fmt"
        "net"
        "os"
        "encoding/json"
        "sync"
)

type PortProps struct {
        Name        *string    `thrift:"name,1" db:"name" json:"name,omitempty"`
        Type        *string    `thrift:"type,2" db:"type" json:"type,omitempty"`
        ExtOpts map[string]string `thrift:"ext_opts,20" db:"ext_opts" json:"ext_opts,omitempty"`
}

type AllProps struct {

        First_Para *string `thrift:"first_para,1"      db:"first_para"  json:"first_para,omitempty"`
        Port            *PortProps            `thrift:"port,3"            db:"port"        json:"port,omitempty"`
}
var host = flag.String("host", "localhost", "host")
var port = flag.String("port", "3333", "port")

func main() {
        PortName := "bond22"
        PortType := "dpdkbond"
        PortExtOpts := map[string]string{"slaves":"eth2,eth3","policy":"l23","mode":"lacp"}

        portCfg :=&PortProps{
                Name: &PortName,
                Type: &PortType,
                ExtOpts:  PortExtOpts,
        }
        var allprops *AllProps =new (AllProps)
        var first_para string = "port"
        allprops.First_Para = &first_para
        allprops.Port = portCfg
json_message, err := json.Marshal(allprops)
        if err != nil {
                fmt.Println("JSON ERR:", err)
        }
        handleCommunications(json_message)
        /* 查看json效果
        var allprops2 *AllProps =new (AllProps)
        err2 := json.Unmarshal([]byte(json_message),allprops2)
        if err!=nil{
            fmt.Println(err2)
        }
        fmt.Println("Json's result as follow")
        fmt.Println(*allprops2) */
}

//Use socket to pass JSON to server
func handleCommunications(json_message []byte) {
        conn, err := net.Dial("tcp", *host+":"+*port)
        if err != nil {
                fmt.Println("Error connecting:", err)
                os.Exit(1)
        }
        defer conn.Close()
        fmt.Println("Connecting to " + *host + ":" + *port)
        var wg sync.WaitGroup
        wg.Add(2)
        go handleWrite(conn, &wg, json_message)
        go handleRead(conn, &wg)
        wg.Wait()

}
// socket write processing operation
func handleWrite(conn net.Conn, wg *sync.WaitGroup, json_message []byte) {
        defer wg.Done()
        _, e := conn.Write(json_message)
        if e != nil {
                fmt.Println("Error to send message because of ", e.Error())
        }

}
// 去掉注释就看循环接收
func handleRead(conn net.Conn, wg *sync.WaitGroup) {
        defer wg.Done()
        //      for  {
        buf := make([]byte, 1024)
        n, err := conn.Read(buf)
        if err != nil {
                fmt.Println("%s", err)
                //break
        }
        fmt.Print(string(buf[:n]))
        //      }
}