Go language Web programming Get and Post request to send and parse method details
- 2020-06-03 06:56:04
- OfStack
The example of this paper describes the Go language Web programming Get and Post request sending and parsing methods. To share for your reference, specific as follows:
This is a primer on the main techniques used in Golang's Web programming with a simple example.
The structure of the paper includes:
1. Client - Get request
2. Client - Post request
3. Server handles Get and Post data
In data encapsulation, we use json in part, so this paper also involves the encoding and decoding of json in Golang.
1. Client-Get
package main
import (
"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());
if err != nil {
log.Fatal(err) return
}
result, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
log.Fatal(err) return
}
fmt.Printf("%s", result)
}
2. Client-Post
package main
import (
"fmt"
"net/url"
"net/http"
"io/ioutil"
"log"
"bytes"
"encoding/json"
)
type Server struct {
ServerName string
ServerIP string
}
type Serverslice struct {
Servers []Server
ServersID string
}
func main() {
var s Serverslice
var newServer 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)
if err != 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)
if err != nil {
log.Fatal(err)
return
}
result, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
log.Fatal(err)
return
}
fmt.Printf("%s", result)
}
3. Server
package main
import (
"fmt"
"net/http"
"strings"
"html"
"io/ioutil"
"encoding/json"
)
type Server struct {
ServerName string
ServerIP string
}
type Serverslice struct {
Servers []Server
ServersID string
}
func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":9001", nil)
}
func handler(w http.ResponseWriter, r *http.Request) {
r.ParseForm() // Parse parameter, default will not parse
fmt.Fprintf(w, "Hi, I love you %s", html.EscapeString(r.URL.Path[1:]))
if r.Method == "GET" {
fmt.Println("method:", r.Method) // Get the method of the request
fmt.Println("username", r.Form["username"])
fmt.Println("password", r.Form["password"])
for k, v := range r.Form {
fmt.Print("key:", k, "; ")
fmt.Println("val:", strings.Join(v, ""))
}
} else if r.Method == "POST" {
result, _:= ioutil.ReadAll(r.Body)
r.Body.Close()
fmt.Printf("%s\n", result)
// Recommended handling for unknown types
var f interface{}
json.Unmarshal(result, &f)
m := f.(map[string]interface{})
for k, v := range m {
switch vv := v.(type) {
case string:
fmt.Println(k, "is string", vv)
case int:
fmt.Println(k, "is int", vv)
case float64:
fmt.Println(k,"is float64",vv)
case []interface{}:
fmt.Println(k, "is an array:")
for i, u := range vv {
fmt.Println(i, u)
}
default:
fmt.Println(k, "is of a type I don't know how to handle")
}
}
// We know the structure, and we resolve it to the structure
var s Serverslice;
json.Unmarshal([]byte(result), &s)
fmt.Println(s.ServersID);
for i:=0; i<len(s.Servers); i++ {
fmt.Println(s.Servers[i].ServerName)
fmt.Println(s.Servers[i].ServerIP)
}
}
}I hope this article has been helpful in Go programming.