http WEB客户端：
1. 获取web服务器数据：
func Get(url string) (resp *Response, err error)
返回：http应答包，保存成 struct
type Response struct {
Status string // e.g. "200 OK"
StatusCode int // e.g. 200
Proto string // e.g. "HTTP/1.0"
⋯⋯
Header Header
Body io.ReadCloser
⋯⋯
}
2. defer resp.Body.Close()
3. for 循环提取 Body 数据：
n, err := resp.Body.Read(buf)
if n == 0 {
fmt.Println("--Read finish!")
break
}
if err != nil && err != io.EOF {
fmt.Println("resp.Body.Read err:", err)
return
}
使用
func main() {
//http://这写要写全
resp, err := http.Get("http://baidu.com")
if err != nil {
fmt.Println("http.get err: ", err)
return
}
defer resp.Body.Close()
fmt.Println("Status = ", resp.Status)
fmt.Println("StatusCode = ", resp.StatusCode)
fmt.Println("Header = ", resp.Header)
//body是个io流需要读取
buf := make([]byte, 4*1024)
//创建个字符串来接收
var tmp string
for {
n, err := resp.Body.Read(buf)
if n == 0 {
//读取到EOF也不要退出
fmt.Println("read err: ", err)
break
}
tmp += string(buf[:n])
}
fmt.Println("tmp = ", tmp)
}
输出
Status = 200 OK
StatusCode = 200
Header = map[Accept-Ranges:[bytes] Cache-Control:[max-age=86400] Connection:[Keep-Alive] Content-Length:[81] Content-Type:[text/html] Date:[Wed, 22 May 2019 13:12:23 GMT] Etag:["51-47cf7e6ee8400"] Expires:[Thu, 23 May 2019 13:12:23 GMT] Last-Modified:[Tue, 12 Jan 2010 13:48:00 GMT] Server:[Apache]]
read err: EOF
tmp = <html>
<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">
</html>