使用go的net/http实现读取web页面

浏览数：37 / 时间：2015年06月10日 
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. 
 
 


			

			
			

				
本文来自：开源中国博客

				
感谢作者：学思

				
查看原文：使用go的net/http实现读取web页面

			


          

            

              
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