// server 
package main 
import ( 
 "fmt" 
 "net" 
) 
 
var ConnMap map[string]*net.TCPConn 
func checkErr(err error) int { 
 if err != nil { 
 if err.Error() == "EOF" { 
  fmt.Println("用户退出") 
  return 0 
 } 
 fmt.Println("发生错误") 
 return -1 
 } 
 return 1 
} 
func say(tcpConn *net.TCPConn) { 
 for { 
 data := make([]byte, 256) 
 total, err := tcpConn.Read(data) 
 if err != nil { 
  fmt.Println(string(data[:total]), err) 
 } else { 
  fmt.Println(string(data[:total])) 
 } 
 flag := checkErr(err) 
 if flag == 0 { 
  break 
 } 
 for _, conn := range ConnMap { 
  if conn.RemoteAddr().String() == tcpConn.RemoteAddr().String() { 
  continue 
  } 
  conn.Write(data[:total]) 
 } 
 } 
} 
func main() { 
 //var conn net.TCPConn 
 //localAddr :=conn.LocalAddr().String() 
 //fmt.Println(localAddr) 
 //tcpAddr, _ := net.ResolveTCPAddr("tcp",localAddr) 
 tcpAddr, _ := net.ResolveTCPAddr("tcp", "192.168.128.216:8080") 
 tcpListen, _ := net.ListenTCP("tcp", tcpAddr) 
 ConnMap = make(map[string]*net.TCPConn) 
 for { 
 tcpConn, _ := tcpListen.AcceptTCP() 
 defer tcpConn.Close() 
 ConnMap[tcpConn.RemoteAddr().String()] = tcpConn 
 fmt.Println("连接客户端信息：", tcpConn.RemoteAddr().String()) 
 go say(tcpConn) 
 } 
} 

// client 
package main 
import ( 
 "fmt" 
 "net" 
 "os" 
) 

var ch chan int = make(chan int) 
var nickname string 
func reader(conn *net.TCPConn) { 
 buff := make([]byte, 256) 
 for { 
 j, err := conn.Read(buff) 
 if err != nil { 
  ch <- 1 
  break 
 } 
 fmt.Printf("%s\n", buff[0:j]) 
 } 
} 
func main() { 
 if len(os.Args) != 2 { 
 fmt.Fprintf(os.Stderr, "Usage:%s host:port", os.Args[0]) 
 os.Exit(1) 
 } 
 service := os.Args[1] 
 TcpAdd, _ := net.ResolveTCPAddr("tcp", service) 
 //TcpAdd, _ := net.ResolveTCPAddr("tcp", "localhost:8080") 
 conn, err := net.DialTCP("tcp", nil, TcpAdd) 
 if err != nil { 
 fmt.Println("服务没打开") 
 os.Exit(1) 
 } 
 defer conn.Close() 
 go reader(conn) 
 fmt.Println("请输入昵称") 
 fmt.Scanln(&nickname) 
 fmt.Println("你的昵称是：", nickname) 
 //var str string 
 for { 
 var msg string 
 fmt.Scan(&msg) 
 fmt.Print("<" + nickname + ">" + "说:") 
 //for i, _ := range msg { 
 // fmt.Printf("%c", msg[i]) 
 //} 
 fmt.Println(msg) 
 b := []byte("<" + nickname + ">" + "说：" + msg) 
 conn.Write(b) 
 select { 
 case <-ch: 
  fmt.Println("server发生错误，请重新连接") 
  os.Exit(2) 
 default: 
 } 
 } 
}