How to use Go language to write the delivery fee settlement module in the door-to-door cooking system?

How to use Go language to write the delivery fee settlement module in the door-to-door cooking system?

With the rapid development of the Internet, door-to-door cooking services are becoming more and more popular in cities. In order to provide more convenient services, many door-to-door cooking companies have begun to develop corresponding delivery fee settlement modules. This article will introduce how to use Go language to write the delivery fee settlement module in the door-to-door cooking system, and attach specific code examples.

1. Requirement Analysis
   First of all, we need to clarify the needs of the delivery fee settlement module. Usually, this module needs to implement the following functions:
2. Calculate delivery costs based on delivery distance and delivery method.
3. Add delivery fees to your order.
4. Provides a query interface to query the delivery costs of orders.
5. Code structure design
   Next, we will design the code structure of this module. A common structural design is to divide the code into multiple files according to functions, such as: main.go, calculate.go, order.go, etc.

• main.go: Main function entrance, used to start the program and process requests.
• calculate.go: Methods and logic for calculating delivery costs.
• order.go: Related methods and logic for processing orders.

3. Sample code
   The following is a simple sample code that demonstrates how to use Go language to write the delivery fee settlement module in the door-to-door cooking system.

// main.go
package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/calculate", calculateHandler) // 计算配送费用的接口
    http.HandleFunc("/addFee", addFeeHandler)       // 将配送费用添加到订单的接口
    http.HandleFunc("/queryFee", queryFeeHandler)   // 查询订单的配送费用的接口

    fmt.Println("Server is running on port 8080...")
    http.ListenAndServe(":8080", nil)
}

func calculateHandler(w http.ResponseWriter, r *http.Request) {
    // 接收参数，包括配送距离和配送方式
    distance := r.FormValue("distance")
    method := r.FormValue("method")

    // 调用calculateFee方法计算配送费用
    fee := calculateFee(distance, method)

    // 返回计算得到的配送费用
    fmt.Fprintf(w, "Delivery fee: %v", fee)
}

func addFeeHandler(w http.ResponseWriter, r *http.Request) {
    // 接收参数，包括订单号和配送费用
    orderID := r.FormValue("orderID")
    fee := r.FormValue("fee")

    // 调用addFeeToOrder方法将配送费用添加到订单
    addFeeToOrder(orderID, fee)

    fmt.Fprintf(w, "Fee added to order successfully")
}

func queryFeeHandler(w http.ResponseWriter, r *http.Request) {
    // 接收参数，包括订单号
    orderID := r.FormValue("orderID")

    // 调用getFeeFromOrder方法查询订单的配送费用
    fee := getFeeFromOrder(orderID)

    // 返回查询得到的配送费用
    fmt.Fprintf(w, "Delivery fee for order %v: %v", orderID, fee)
}

// calculate.go
package main

func calculateFee(distance, method string) float64 {
    // 根据配送距离和配送方式，使用相应的计算公式计算配送费用
    // ...

    return fee
}

// order.go
package main

type Order struct {
    ID  string
    Fee float64
}

func addFeeToOrder(orderID, fee string) {
    // 将配送费用添加到订单中
    // ...
}

func getFeeFromOrder(orderID string) float64 {
    // 查询订单的配送费用
    // ...

    return fee
}

4. Summary
   This article introduces how to use Go language to write the delivery fee settlement module in the door-to-door cooking system, and provides specific code examples. Through this example, we can clearly understand the design and implementation process of this module. Of course, actual projects still need to be expanded and improved according to needs. I hope this article will be helpful to you in developing a delivery fee settlement module using Go language!

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