package mainimport (	"os"	"net/http"	"fmt"	"io/ioutil"	"strings")func main(){	for _,arg :=range os.Args[1:]{		if !strings.HasPrefix(arg,"http://"){ //检查输入的url 中是否有协议前缀			arg= "http://"+arg		}		res,err := http.Get(arg)		if err !=nil{  //遇到错误  返回状态码并且退出			fmt.Fprint(os.Stderr,"fetch: %s:%v\n",err,res.Status)			os.Exit(1)		}		body,err := ioutil.ReadAll(res.Body)//读取数据流  存入 body中		res.Body.Close()		if err != nil{ //遇到错误  返回状态码并且退出			fmt.Fprint(os.Stderr,"fetch %s:%v:$s",arg,err,res.Status)			os.Exit(1)		}		fmt.Printf("%s:$s",body,res.Status)	}}

命令行中输入  go build xxx.go

./xxx  www.baidu.com

以上是单线程的例子接下来使用go 关键字 开发一个多线程的

package mainimport (	"os"	"time"	"fmt"	"net/http"	"io"	"io/ioutil"	"strings")func main(){	start := time.Now()	ch := make(chan string)	for _,url :=range os.Args[1:]{		go fetch(url,ch)	}	for range os.Args[1:]{		fmt.Println(<-ch)	}	fmt.Printf("%.2fs elapsed\n",time.Since(start).Seconds())}func fetch(url string,ch chan<- string){	start := time.Now()	if(!strings.HasPrefix(url,"http://")){		url ="http://"+ url	}	res,err := http.Get(url)	if err != nil{		ch <- fmt.Sprint(err)		return	}	nbytes,err := io.Copy(ioutil.Discard,res.Body)	res.Body.Close()	if err != nil{		ch <- fmt.Sprint("while rading %s:$v",url,err)		return	}	secs := time.Since(start).Seconds()	ch <- fmt.Sprint("%.2fs %7d %s",secs,nbytes,url)}

支持多个链接

尝试一下  还是蛮好玩的