http客戶端 · go

[TOC] # 簡介 http WEB客戶端： ~~~ 1. 獲取web服務器數據： func Get(url string) (resp *Response, err error) 返回：http應答包，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 循環提取 Body 數據： 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://這寫要寫全 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是個io流需要讀取 buf := make([]byte, 4*1024) //創建個字符串來接收 var tmp string for { n, err := resp.Body.Read(buf) if n == 0 { //讀取到EOF也不要退出 fmt.Println("read err: ", err) break } tmp += string(buf[:n]) } fmt.Println("tmp = ", tmp) } ~~~ 輸出 ~~~ 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> ~~~