如何用Go语言开发一个简单的在线订阅系统

package models

type User struct {
    ID       int
    Name     string
    Email    string
    Password string
    Subscriptions []Subscription
}

type Subscription struct {
    ID          int
    PlanID      int
    UserID      int
    Active      bool
    ExpiryDate  string
}

package handlers

import (
    "net/http"
    "encoding/json"
    "io/ioutil"
    "strconv"
    "github.com/gorilla/mux"
    "yourapp/models"
)

func RegisterUserHandler(w http.ResponseWriter, r *http.Request) {
    var user models.User
    body, _ := ioutil.ReadAll(r.Body)
    err := json.Unmarshal(body, &user)
    // 处理用户注册逻辑
    // ...
}

func SubscribeHandler(w http.ResponseWriter, r *http.Request) {
    vars := mux.Vars(r)
    userID, _ := strconv.Atoi(vars["userID"])
    planID, _ := strconv.Atoi(vars["planID"])
    // 处理订阅逻辑
    // ...
}

package main

import (
    "net/http"
    "yourapp/handlers"
    "github.com/gorilla/mux"
    "github.com/jinzhu/gorm"
    _ "github.com/jinzhu/gorm/dialects/mysql"
)

func main() {
    router := mux.NewRouter()
    router.HandleFunc("/register", handlers.RegisterUserHandler).Methods("POST")
    router.HandleFunc("/subscribe/{userID}/{planID}", handlers.SubscribeHandler).Methods("POST")

    // 连接数据库
    db, err := gorm.Open("mysql", "user:password@/dbname?charset=utf8&parseTime=True&loc=Local")
    if err != nil {
        panic("failed to connect database")
    }
    defer db.Close()

    // 日志记录
    // ...

    http.ListenAndServe(":8080", router)
}