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fmt
Package
fmtimplements formatted I/O with functions analogous to C’s printf and scanf.The format ‘
verbs’ are drived from C’s but are simpler. -
fmt.Println
Println formats using the default formats for its operands and writes to standard output.
Spaces are always added between operands and a newline is appended.
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net/http
Package
httpprovides 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"}})The client must close the response body when finished with it:
resp, err := http.Get("http://example.com/") if err != nil { // handle error } defer resp.Body.Close() body, err := ioutil.ReadAll《理解:=||nil||defer in Go》
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