内容简介：type TCPAddr struct {IP IPPort int
TCPAddr
type TCPAddr struct {
IP IP
Port int
}
ResolveTCPAddr函数用于创建TCPAddr
func ResolveTCPAddr(net, addr string) (*TCPAddr, os.Error)
其中参数net是“tcp”，“tcp4”或“tcp6”之一，addr是由主机名或IP地址组成的字符串，后跟“：”后面的端口号，例如“ www.google.com:80 “或”127.0.0.1:22“。
func DialTCP(net string, laddr, raddr *TCPAddr) (c *TCPConn, err os.Error) func (c *TCPConn) SetTimeout(nsec int64) os.Error func (c *TCPConn) SetKeepAlive(keepalive bool) os.Error func (c *TCPConn) Write(b []byte) (n int, err os.Error) func (c *TCPConn) Read(b []byte) (n int, err os.Error)
客户端
/* GetHeadInfo
*/
package main
import (
"net"
"os"
"fmt"
"io/ioutil"
)
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]
// 生成TCPAddr
tcpAddr, err := net.ResolveTCPAddr("tcp4", service)
checkError(err)
// 创建网络连接
conn, err := net.DialTCP("tcp", nil, tcpAddr)
checkError(err)
// 写数据
_, err = conn.Write([]byte("HEAD / HTTP/1.0\r\n\r\n"))
checkError(err)
// 读数据
result, err := ioutil.ReadAll(conn)
checkError(err)
fmt.Println(string(result))
os.Exit(0)
}
func checkError(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())
os.Exit(1)
}
}
测试
$ ./net www.baidu.com:80 HTTP/1.0 302 Found Content-Length: 17931 Content-Type: text/html Date: Fri, 18 Jan 2019 15:33:50 GMT Etag: "54d9748e-460b" Server: bfe/1.0.8.18
服务器
func ListenTCP(net string, laddr *TCPAddr) (l *TCPListener, err os.Error) func (l *TCPListener) Accept() (c Conn, err os.Error)
ListenTCP为服务器监听端口，Accept代表锁住，等待客户端连接
/* DaytimeServer
*/
package main
import (
"fmt"
"net"
"os"
"time"
)
func main() {
service := ":1200"
tcpAddr, err := net.ResolveTCPAddr("tcp4", service)
checkError(err)
listener, err := net.ListenTCP("tcp", tcpAddr)
checkError(err)
for {
conn, err := listener.Accept()
if err != nil {
continue
}
daytime := time.Now().String()
conn.Write([]byte(daytime)) // don't care about return value
conn.Close() // we're finished with this client
}
}
func checkError(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())
os.Exit(1)
}
}
多线程服务器
/* ThreadedEchoServer
*/
package main
import (
"net"
"os"
"fmt"
)
func main() {
service := ":1201"
tcpAddr, err := net.ResolveTCPAddr("tcp4", service)
checkError(err)
listener, err := net.ListenTCP("tcp", tcpAddr)
checkError(err)
for {
conn, err := listener.Accept()
if err != nil {
continue
}
// run as a goroutine
go handleClient(conn)
}
}
func handleClient(conn net.Conn) {
// close connection on exit
defer conn.Close()
var buf [512]byte
for {
// read upto 512 bytes
n, err := conn.Read(buf[0:])
if err != nil {
return
}
// write the n bytes read
_, err2 := conn.Write(buf[0:n])
if err2 != nil {
return
}
}
}
func checkError(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())
os.Exit(1)
}
}
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