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。

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