模式定义
将一个申请（行为）封装为一个对象，从而使你可用不同的申请对客户进行参数化，对申请排队或记录申请日志，以及反对可撤销的操作
类图
要点总结
- Command模式的基本目标在于将“行为请求者”与“行为实现者”解耦，在面向对象语言中，常见的实现伎俩是“将行为形象为对象”
- 实现Command接口的具体命令对象ConcreteCommand有时候依据须要可能会保留一些额定的状态信息，通过应用Composite模式，能够将多个“命令”封装为一个“复合命令”MacroCommand
Go语言代码实现
工程目录
command.go
package Commandimport "fmt"type Person struct { name string cmd Command}type Command struct { person *Person method func()}func NewCommand (p *Person, method func()) Command { return Command{ person: p, method: method, }}func (c *Command) Execute(){ c.method()}func NewPerson (name string, cmd Command) Person{ return Person{ name: name, cmd: cmd, }}func (p *Person) Buy() { fmt.Println(fmt.Sprintf("%s is buying ", p.name)) p.cmd.Execute()}func (p *Person) Cook() { fmt.Println(fmt.Sprintf("%s is cooking ", p.name)) p.cmd.Execute()}func (p *Person) Wash() { fmt.Println(fmt.Sprintf("%s is washing ", p.name)) p.cmd.Execute()}func (p *Person) Listen() { fmt.Println(fmt.Sprintf("%s is listening ", p.name)) p.cmd.Execute()}func (p *Person) Talk() { fmt.Println(fmt.Sprintf("%s is talking ", p.name)) p.cmd.Execute()}command_test.go
package Commandimport "testing"func TestCommand_Execute(t *testing.T) { laowang := NewPerson("wang", NewCommand(nil, nil)) laozhang := NewPerson("zhang", NewCommand(&laowang, laowang.Listen)) laofeng := NewPerson("feng", NewCommand(&laozhang, laozhang.Buy)) laoding := NewPerson("ding", NewCommand(&laofeng, laofeng.Cook)) laoli := NewPerson("li", NewCommand(&laoding, laoding.Wash)) laoli.Talk()}