package main
import (
"fmt"
"io/ioutil" //[1]
"net/http" //[2]
"os" //[3]
"path/filepath" // [4]
)
func main() { if len(os.Args) != 2 { fmt.Printf("useage:%s http://url", filepath.Base(os.Args[0])) os.Exit(1)
}
resp, err := http.Get(os.Args[1])
if err != nil { fmt.Println(err) //go语言会内含详细的错误描述，可以尝试不同的参数来测试
os.Exit(2)
}
defer resp.Body.Close() //The client must close the response body when finished with it:
body, err2 := ioutil.ReadAll(resp.Body) //此处使用了包【1】
if err2 != nil { fmt.Println(err2)
os.Exit(3)
}
fmt.Printf("%s", body) }
##生成程序测试
getwebpage.exe useage:getwebpage.exe http://url
getwebpage.exe http://ww Get http://ww: dial tcp: GetAddrInfoW: No such host is known.
getwebpage.exe htt Get htt: unsupported protocol scheme ""
相关说明
在DOS里执行命令 “godoc -http=:8000”后可以查到相关包
http://127.0.0.1:8000/pkg/net/http/
http://127.0.0.1:8000/pkg/io/ioutil/#ReadAll
Package http provides HTTP client and server implementations.
Get, Head, Post, and PostForm make HTTP (or HTTPS) requests:
resp, err := http.Get("http://example.com/")
...
resp, err := http.Post("http://example.com/upload", "image/jpeg", &buf)
...
resp, err := http.PostForm("http://example.com/form",
url.Values{"key": {"Value"}, "id": {"123"}})
//func ReadAll(r io.Reader) ([]byte, error)
ReadAll reads from r until an error or EOF and returns the data it read. A successful call returns err == nil, not err == EOF. Because ReadAll is defined to read from src until EOF, it does not treat an EOF from Read as an error to be reported.