简单的Restful API例子(Golang)

         RESTful API 这玩意不用多说了，用Go做了个很简单的例子:

               服务端在被调用时返回JSON,

               客户端解析得到相关JSON信息.

服务端源码:

package main

//简单的JSON Restful API演示(服务端)
//author: Xiong Chuan Liang
//date: 2015-2-28

import (
  "encoding/json"
  "fmt"
  "net/http"
  "time"
)

type Item struct {
  Seq    int
  Result map[string]int
}

type Message struct {
  Dept    string
  Subject string
  Time    int64
  Detail  []Item
}

func getJson() ([]byte, error) {
  pass := make(map[string]int)
  pass["x"] = 50
  pass["c"] = 60
  item1 := Item{100, pass}

  reject := make(map[string]int)
  reject["l"] = 11
  reject["d"] = 20
  item2 := Item{200, reject}

  detail := []Item{item1, item2}
  m := Message{"IT", "KPI", time.Now().Unix(), detail}
  return json.MarshalIndent(m, "", "")
}

func handler(w http.ResponseWriter, r *http.Request) {
  resp, err := getJson()
  if err != nil {
    panic(err)
  }
  fmt.Fprintf(w, string(resp))
}

func main() {
  http.HandleFunc("/", handler)
  http.ListenAndServe("localhost:8085", nil)
}

 服务端源码运行后，可在浏览器中执行看下效果:

 说明返回是正常的。再用Go写个调用程序测试下:

package main

//简单的JSON Restful API演示(调用端)
//author: Xiong Chuan Liang
//date: 2015-2-28

import (
  "encoding/json"
  "fmt"
  "io/ioutil"
  "net/http"
  "time"
)

type Item struct {
  Seq    int
  Result map[string]int
}

type Message struct {
  Dept    string
  Subject string
  Time    int64
  Detail  []Item
}

func main() {
  url := "http://localhost:8085"
  ret, err := http.Get(url)

  if err != nil {
    panic(err)
  }
  defer ret.Body.Close()

  body, err := ioutil.ReadAll(ret.Body)
  if err != nil {
    panic(err)
  }

  var msg Message
  err = json.Unmarshal(body, &msg)
  if err != nil {
    panic(err)
  }

  strTime := time.Unix(msg.Time, 0).Format("2006-01-02 15:04:05")
  fmt.Println("Dept:", msg.Dept)
  fmt.Println("Subject:", msg.Subject)
  fmt.Println("Time:", strTime, "\n", msg.Detail)
}

/*
//运行结果:

Dept: IT
Subject: KPI
Time: 2015-02-28 16:43:11
 [{100 map[c:60 x:50]} {200 map[d:20 l:11]}]

*/

  从运行结果中可以看到，已正确得到相关JSON信息。