项目结构:
customer.go
package model
import (
"fmt"
)
//声明一个Customer结构体,表示一个客户信息
type Customer struct {
Id int
Name string
Gender string
Age int
Phone string
Email string
}
//编写一个工厂模式,返回一个Customer的实例
func NewCustomer(id int, name string, gender string,
age int, phone string, email string) Customer {
return Customer {
Id : id,
Name : name,
Gender : gender,
Age : age,
Phone : phone,
Email : email,
}
}
//第二种创建Customer实例方法,不带id
func NewCustomer2(name string, gender string,
age int, phone string, email string) Customer {
return Customer {
Name : name,
Gender : gender,
Age : age,
Phone : phone,
Email : email,
}
}
//返回用户的信息,格式化的字符串
func (this Customer) GetInfo() string {
info := fmt.Sprintf("%v\t%v\t%v\t%v\t%v\t%v\t", this.Id,
this.Name, this.Gender, this.Age, this.Phone, this.Email)
return info
}
customerService.go
package service
import (
"go_code/customerManage/model"
)
//该CustomerService,完成对Customer的操作,包括增删改查
type CustomerService struct {
customers []model.Customer
//声明一个字段,表示当前切片含有多少个客户
//该字段后面,还可以作为新客户的id + 1
customerNum int
}
//编写一个方法,可以返回 *CustomService
func NewCustomerService() *CustomerService {
//为了能够看到有客户在切片中,我们初始化一个客户
customerService := &CustomerService{}
customerService.customerNum = 1
customer := model.NewCustomer(1, "张三", "男", 20, "112", "[email protected]")
customerService.customers = append(customerService.customers, customer)
return customerService
}
//返回客户切片
func (this *CustomerService) List() []model.Customer {
return this.customers
}
//添加客户到customers切片
//一定要是指针
func (this *CustomerService) Add(customer model.Customer) bool {
//我们确定一个分配id的规则,就是添加的顺序
this.customerNum++
customer.Id = this.customerNum
this.customers = append(this.customers, customer)
return true
}
//根据id查找客户在切片中对应下标,如果没有该客户,返回-1
func (this *CustomerService) FindById(id int) int {
index := -1
//遍历this.customers 切片
for i := 0; i < len(this.customers); i++ {
if this.customers[i].Id == id {
//找到
index = i
}
}
return index
}
//根据id删除客户(从切片中删除)
func (this *CustomerService) Delete(id int) bool {
index := this.FindById(id)
//如果index == -1 ,说明没有这个客户
if index == -1 {
return false
}
//如何从切片中删除一个元素
this.customers = append(this.customers[:index], this.customers[index+1:]...)
return true
}
//根据id修改客户(从切片中修改)
func (this *CustomerService) Update(customer model.Customer) bool {
index := this.FindById(customer.Id)
//如何从切片中修改一个元素
this.customers[index].Name = customer.Name
this.customers[index].Gender = customer.Gender
this.customers[index].Age = customer.Age
this.customers[index].Phone = customer.Phone
this.customers[index].Email = customer.Email
return true
}
customerView.go
package main
import (
"fmt"
"go_code/customerManage/service"
"go_code/customerManage/model"
)
type customerView struct {
//定义必要的字段
key string // 接收用户输入...
loop bool // 表示是否循环的显示主菜单
//增加一个字段customerService
customerService *service.CustomerService
}
//显示所有的客户信息
func (this *customerView) List() {
//首先,获取到当前所有的客户信息(在切片中)
customers := this.customerService.List()
//显示
fmt.Println("-----------客户列表-----------")
fmt.Println("编号\t姓名\t性别\t年龄\t电话\t邮箱")
for i := 0; i < len(customers); i++ {
// fmt.Println(customers[i].Id, "\t", customers[i].Name...)
fmt.Println(customers[i].GetInfo())
}
fmt.Printf("\n-----------客户列表完成-----------\n\n")
}
//得到用户的输入,信息构建新的客户,并完成添加
func (this *customerView) Add() {
fmt.Println("-----------添加客户-----------")
fmt.Println("姓名:")
name := ""
fmt.Scanln(&name)
fmt.Println("性别:")
gender := ""
fmt.Scanln(&gender)
fmt.Println("年龄:")
age := 0
fmt.Scanln(&age)
fmt.Println("电话:")
phone := ""
fmt.Scanln(&phone)
fmt.Println("电邮:")
email := ""
fmt.Scanln(&email)
//构建一个新的Custom实例
//注意:id号,没有让用户输入,id是唯一的,需要系统分配
customer := model.NewCustomer2(name, gender, age, phone, email)
//调用
if this.customerService.Add(customer) {
fmt.Println("-----------添加完成-----------")
} else {
fmt.Println("-----------添加失败-----------")
}
}
//得到用户的输入id,删除该id对用的客户
func (this *customerView) Delete() {
fmt.Println("-----------删除客户-----------")
fmt.Println("请选择待删除客户编号(-1)退出:")
id := -1
fmt.Scanln(&id)
if id == -1 {
return // 放弃删除
}
fmt.Println("确认是否删除(Y/N):")
//这里可以加入一个循环判断
choice := ""
fmt.Scanln(&choice)
if choice == "y" || choice == "Y" {
//调用customerService的Delete方法
if this.customerService.Delete(id) {
fmt.Println("-----------删除完成-----------")
} else {
fmt.Println("-----------删除失败,输入的id不存在-----------")
}
}
}
//得到用户的输入id,修改该id对用的客户
func (this *customerView) Update() {
fmt.Println("-----------修改客户-----------")
fmt.Println("请选择待修改客户编号(-1)退出:")
id := -1
fmt.Scanln(&id)
if id == -1 {
return // 放弃修改
}
fmt.Println("确认是否修改(Y/N):")
//这里可以加入一个循环判断
choice := ""
fmt.Scanln(&choice)
if choice == "y" || choice == "Y" {
fmt.Println("要修改的客户的信息:")
customers := this.customerService.List()
index := this.customerService.FindById(id)
fmt.Println(customers[index].GetInfo())
fmt.Println("-----------修改信息-----------")
fmt.Println("姓名:")
name := ""
fmt.Scanln(&name)
fmt.Println("性别:")
gender := ""
fmt.Scanln(&gender)
fmt.Println("年龄:")
age := 0
fmt.Scanln(&age)
fmt.Println("电话:")
phone := ""
fmt.Scanln(&phone)
fmt.Println("电邮:")
email := ""
fmt.Scanln(&email)
customer := model.NewCustomer(id, name, gender, age, phone, email)
//调用customerService的Update方法
if this.customerService.Update(customer) {
fmt.Println("-----------修改完成-----------")
} else {
fmt.Println("-----------修改失败,输入的id不存在-----------")
}
}
}
//退出软件
func (this *customerView) exit() {
fmt.Println("确认是否退出(Y/N):")
for {
fmt.Scanln(&this.key)
if this.key == "Y" || this.key == "y" || this.key == "N" || this.key == "n" {
break
}
fmt.Println("你的输入有误,确认是否退出(Y/N):")
}
if this.key == "Y" || this.key == "y" {
this.loop = false
}
}
//显示主菜单
func (this *customerView) mainMenu() {
for {
fmt.Println("-----------客户信息管理软件-----------")
fmt.Println(" 1 添 加 客 户")
fmt.Println(" 2 修 改 客 户")
fmt.Println(" 3 删 除 客 户")
fmt.Println(" 4 客 户 列 表")
fmt.Println(" 5 退 出")
fmt.Println("请选择(1-5):")
fmt.Scanln(&this.key)
switch this.key {
case "1" :
//fmt.Println("添 加 客 户")
this.Add()
case "2" :
//fmt.Println("修 改 客 户")
this.Update()
case "3" :
//fmt.Println("删 除 客 户")
this.Delete()
case "4" :
//fmt.Println("客 户 列 表")
this.List()
case "5" :
//this.loop = false
this.exit()
default :
fmt.Println("你的输入有误,请重新输入...")
}
if !this.loop {
break
}
}
fmt.Println("你退出了客户关系管理系统")
}
func main() {
//在main函数中创建一个cutomerView,并运行显示主菜单...
customerView := customerView{
key : "",
loop : true,
}
//这里完成customerView结构体的customService字段的初始化
customerView.customerService = service.NewCustomerService()
//显示主菜单..
customerView.mainMenu()
}
界面如图: