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使用go的net/http实现读取web页面
学思 · · 10779 次点击 · · 开始浏览这是一个创建于 的文章,其中的信息可能已经有所发展或是发生改变。
packagemain
import(
"fmt"
"io/ioutil"//[1]
"net/http"//[2]
"os"//[3]
"path/filepath"//[4]
)
funcmain(){
iflen(os.Args)!=2{
fmt.Printf("useage:%shttp://url",filepath.Base(os.Args[0]))
os.Exit(1)
}
resp,err:=http.Get(os.Args[1])
iferr!=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)
}
deferresp.Body.Close()//Theclientmustclosetheresponsebodywhenfinishedwithit:
body,err2:=ioutil.ReadAll(resp.Body)//此处使用了包【1】
iferr2!=nil{
fmt.Println(err2)
os.Exit(3)
}
fmt.Printf("%s",body)
}
##生成程序测试
getwebpage.exe
useage:getwebpage.exe http://url
useage:getwebpage.exe http://url
getwebpage.exe http://ww
Get http://ww: dial tcp: GetAddrInfoW: No such host is known.
Get http://ww: dial tcp: GetAddrInfoW: No such host is known.
getwebpage.exe htt
Get htt: unsupported protocol scheme ""
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.
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packagemain
import(
"fmt"
"io/ioutil"//[1]
"net/http"//[2]
"os"//[3]
"path/filepath"//[4]
)
funcmain(){
iflen(os.Args)!=2{
fmt.Printf("useage:%shttp://url",filepath.Base(os.Args[0]))
os.Exit(1)
}
resp,err:=http.Get(os.Args[1])
iferr!=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)
}
deferresp.Body.Close()//Theclientmustclosetheresponsebodywhenfinishedwithit:
body,err2:=ioutil.ReadAll(resp.Body)//此处使用了包【1】
iferr2!=nil{
fmt.Println(err2)
os.Exit(3)
}
fmt.Printf("%s",body)
}
##生成程序测试
getwebpage.exe
useage:getwebpage.exe http://url
useage:getwebpage.exe http://url
getwebpage.exe http://ww
Get http://ww: dial tcp: GetAddrInfoW: No such host is known.
Get http://ww: dial tcp: GetAddrInfoW: No such host is known.
getwebpage.exe htt
Get htt: unsupported protocol scheme ""
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.