经历了两个版本，基础内容在前面，可以使用之前的基础环境：

v1：
https://blog.csdn.net/wtt234/article/details/132139454

v2：
https://blog.csdn.net/wtt234/article/details/132144907

 

一、代码组织结构

二、代码

2.1user.go

package mainimport "net"type User struct {Name stringAddr stringC    chan stringconn net.Connserver *Server
}//创建一个用户的API
func NewUser(conn net.Conn, server *Server) *User {userAddr := conn.RemoteAddr().String()user := &User{Name: userAddr,Addr: userAddr,C:    make(chan string),conn: conn,server: server,}//启动监听当前user channel消息的goroutinego user.ListenMessage()return user
}//用户的上线业务
func (this *User) Online() {//用户上线,将用户加入到onlineMap中this.server.mapLock.Lock()this.server.OnlineMap[this.Name] = thisthis.server.mapLock.Unlock()//广播当前用户上线消息this.server.BroadCast(this, "已上线")
}//用户的下线业务
func (this *User) Offline() {//用户下线,将用户从onlineMap中删除this.server.mapLock.Lock()delete(this.server.OnlineMap, this.Name)this.server.mapLock.Unlock()//广播当前用户上线消息this.server.BroadCast(this, "下线")}//用户处理消息的业务
func (this *User) DoMessage(msg string) {this.server.BroadCast(this, msg)
}//监听当前User channel的 方法,一旦有消息，就直接发送给对端客户端
func (this *User) ListenMessage() {for {msg := <-this.Cthis.conn.Write([]byte(msg + "\n"))}
}

 

2.2server.go

package mainimport ("fmt""io""net""sync"
)type Server struct {Ip   stringPort int//在线用户的列表OnlineMap map[string]*UsermapLock   sync.RWMutex//消息广播的channelMessage chan string
}//创建一个server的接口
func NewServer(ip string, port int) *Server {server := &Server{Ip:        ip,Port:      port,OnlineMap: make(map[string]*User),Message:   make(chan string),}return server
}//监听Message广播消息channel的goroutine，一旦有消息就发送给全部的在线User
func (this *Server) ListenMessager() {for {msg := <-this.Message//将msg发送给全部的在线Userthis.mapLock.Lock()for _, cli := range this.OnlineMap {cli.C <- msg}this.mapLock.Unlock()}
}//广播消息的方法
func (this *Server) BroadCast(user *User, msg string) {sendMsg := "[" + user.Addr + "]" + user.Name + ":" + msgthis.Message <- sendMsg
}func (this *Server) Handler(conn net.Conn) {//...当前链接的业务//fmt.Println("链接建立成功")user := NewUser(conn, this)user.Online()//接受客户端发送的消息go func() {buf := make([]byte, 4096)for {n, err := conn.Read(buf)if n == 0 {user.Offline()return}if err != nil && err != io.EOF {fmt.Println("Conn Read err:", err)return}//提取用户的消息(去除'\n')msg := string(buf[:n-1])//用户针对msg进行消息处理user.DoMessage(msg)}}()//当前handler阻塞select {}
}//启动服务器的接口
func (this *Server) Start() {//socket listenlistener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", this.Ip, this.Port))if err != nil {fmt.Println("net.Listen err:", err)return}//close listen socketdefer listener.Close()//启动监听Message的goroutinego this.ListenMessager()for {//acceptconn, err := listener.Accept()if err != nil {fmt.Println("listener accept err:", err)continue}//do handlergo this.Handler(conn)}
}

2.3main.go

package mainfunc main() {server := NewServer("127.0.0.1", 8000)server.Start()
}

三、客户端登录测试

客户端1登录

 

客户端2登录发送信息