Golang get and POST request sending and parsing for Web programming

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Golang get and POST request sending and parsing for Web programming

Time 2014-08-19 15:26:48 CSDN Blog original http://blog.csdn.net/typ2004/article/details/38669949

This article is an introductory article that introduces the techniques used by Golang Web programming through a simple example.

The structure of the article includes:

1. Client-get Request
2. Client-post Request
3. Server processes Get and Post data

In the encapsulation of data, we use JSON in part, so this article also involves the encoding and decoding of JSON in Golang.

First, Client-get

 PackageMainimport ("FMT""Net/url""Net/http""Io/ioutil""Log") Func main () {u,_: = URL. Parse ("Http://localhost:9001/xiaoyue")Q: = U.query ()Q. Set ("username","User")Q. Set ("Password","passwd") U.rawquery =Q. Encode () res, err: = http. Get (U.string ());ifErr! = Nil {Log. Fatal (ERR)return}result, err: = Ioutil. ReadAll (Res. Body) Res. Body.close ()ifErr! = Nil {Log. Fatal (ERR)return} FMT. Printf ('%s', result)}

Second, Client-post

Package Mainimport ("FMT""Net/url""Net/http""Io/ioutil""Log""bytes""Encoding/json") Type Serverstruct{ServerNamestringServerIPstring}type Serverslicestruct{Servers []serverserversidstring}func Main () {varS ServerslicevarNewServer Server;newserver.servername ="Guangzhou_vpn"; Newserver.serverip ="127.0.0.1"S.servers = Append (s.servers, newserver) s.servers = append (S.servers, Server{servername:"Shanghai_vpn", ServerIP:"127.0.0.2"}) S.servers = Append (S.servers, Server{servername:"Beijing_vpn", ServerIP:"127.0.0.3"}) S.serversid ="team1"B, err: = json. Marshal (s)ifErr! = Nil {fmt. Println ("JSON err:", err)}body: = bytes. Newbuffer ([]byte(b)) Res,err: = http. Post ("Http://localhost:9001/xiaoyue","Application/json;charset=utf-8", body)ifErr! = Nil {log. Fatal (ERR)return}result, err: = Ioutil. ReadAll (Res. Body) Res. Body.close ()ifErr! = Nil {log. Fatal (ERR)return}fmt. Printf ('%s ', result)}

Package Mainimport ("FMT""Net/http""Strings""HTML""Io/ioutil""Encoding/json") Type Serverstruct{ServerNamestringServerIPstring}type Serverslicestruct{Servers []serverserversidstring}func Main () {http. Handlefunc ("/", handler) HTTP. Listenandserve (": 9001", nil)}func Handler (w http. Responsewriter, R *http. Request) {r.parseform ()//parse parameter, default is not resolvedFmt. fprintf (W,"Hi, I Love you%s"Html. Escapestring (R.url. path[1:]))ifR.method = ="GET"{FMT. Println ("Method:", R.method)//How to get the requestFmt. Println ("username", r.form["username"]) FMT. Println ("Password", r.form["Password"]) forK, V: = Range R.form {fmt. Print ("key:"K"; ") FMT. Println ("val:", strings. Join (V,""))}}Else ifR.method = ="POST"{result, _:= ioutil. ReadAll (R.body) r.body.close () fmt. Printf ("%s\n", result)//unknown types of recommended processing methodsvarFInterface{}json. Unmarshal (result, &f) m: = f. (map[string]Interface{}) forK, V: = range m {SwitchVV: = V. (type) { Case string: FMT. Println (k,"is string", VV) Case int: FMT. Println (k,"is int", VV) CaseFloat64:fmt. Println (k,"is Float64", VV) Case[]Interface{}:fmt. Println (k,"is an array:") forI, U: = Range VV {fmt. Println (I, U)}default: FMT. Println (k,"is of a type I don ' t know what to handle")  }  }//structure known, parse to struct vars serverslice; Json. Unmarshal ([]byte(result), &s) fmt. Println (S.SERVERSID); fori:=0; I
 
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