golang 简单web server

package main

import (
    "encoding/json"
    "html/template"
    "log"
    "net/http"
)

func main() {
    // render template
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        tpl, err := template.ParseFiles("index.html")
        if err != nil {
            log.Println("parse template err->", err)
            return
        }
        var name string = "hello"
        var users []string = []string{"zhangsan", "lisi", "wangwu"}
        tpl.Execute(w, map[string]interface{}{
            "name":  name,
            "users": users,
        })
    })

    // json
    http.HandleFunc("/get_json", func(w http.ResponseWriter, r *http.Request) {

        var user = make(map[string]interface{})
        user["name"] = "admin"
        user["age"] = 23
        data, err := json.Marshal(user)
        if err != nil {
            log.Println("json marshal map data err->", err)
            return
        }

        w.Header().Set("content-type", "application/json")
        w.Write(data)
    })

    // running
    err := http.ListenAndServe(":9090", nil)
    if err != nil {
        log.Println("running error->", err)
        return
    }
}

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