Golang 可以跨平台编译，部署微服务很方便，下面是用Goji 实现 RESTful 微服务示例。
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package main
import (
"encoding/json"
"fmt"
"net/http"
"goji.io"
"goji.io/pat"
)
type book struct {
ISBN string "json:isbn"
Title string "json:name"
Authors string "json:author"
Price string "json:price"
}
var bookStore = []book{
book{
ISBN: "0321774639",
Title: "Programming in Go: Creating Applications for the 21st Century (Developer's Library)",
Authors: "Mark Summerfield",
Price: "$34.57",
},
book{
ISBN: "0134190440",
Title: "The Go Programming Language",
Authors: "Alan A. A. Donovan, Brian W. Kernighan",
Price: "$34.57",
},
}
func main() {
mux := goji.NewMux()
mux.HandleFunc(pat.Get("/books"), allBooks)
mux.HandleFunc(pat.Get("/books/:isbn"), bookByISBN)
mux.Use(logging)
http.ListenAndServe("localhost:8080", mux)
}
func allBooks(w http.ResponseWriter, r *http.Request) {
jsonOut, _ := json.Marshal(bookStore)
fmt.Fprintf(w, string(jsonOut))
}
func bookByISBN(w http.ResponseWriter, r *http.Request) {
isbn := pat.Param(r, "isbn")
for _, b := range bookStore {
if b.ISBN == isbn {
jsonOut, _ := json.Marshal(b)
fmt.Fprintf(w, string(jsonOut))
return
}
}
w.WriteHeader(http.StatusNotFound)
}
func logging(h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("Received request: %v\n", r.URL)
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
其实微服务重要的是业务逻辑的拆分。