Java模式 - Command(命令模式)

[http://www.blogjava.net/supercrsky/articles/200497.html]

[http://xuzhenqinandy.iteye.com/blog/206011]

[http://www.linuxidc.com/Linux/2011-08/41686.htm]

[http://www.360doc.com/content/06/1127/10/5874_273854.shtml]

 

 命令模式有以下角色来组成            
1)  命令角色（Command）：声明执行操作的接口。有java接口或者抽象类来实现。
2)  具体命令角色（Concrete Command）：将一个接收者对象绑定于一个动作；调用接收者相应的操作，以实现命令角色声明的执行操作的接口。
3)  客户角色（Client）：创建一个具体命令对象（并可以设定它的接收者）。
4)  请求者角色（Invoker）：调用命令对象执行这个请求。
5)  接收者角色（Receiver）：知道如何实施与执行一个请求相关的操作。任何类都可能作为一个接收者。

 

命令模式在SWING中经常用到，这种模式经常用在按钮上面。我现在把SWING中的这种模式提取出来供大家一起来讨论。

首先建立命令借口

public interface CommandInterface {
 public void excute();
}

public interface CommandInterface {
 public void excute();
}

在建立两个不同的命令执行类

public class InCommand implements CommandInterface{

 /**
  * 具体的命令执行内容
  */
 public void excute() {
  System.out.println("int command");
 }

}

public class OutCommand implements CommandInterface{

 /**
  * 具体的命令执行内容
  */
 public void excute() {
  System.out.println("out command");
 }

}

public class InCommand implements CommandInterface{

 /**
  * 具体的命令执行内容
  */
 public void excute() {
  System.out.println("int command");
 }

}

public class OutCommand implements CommandInterface{

 /**
  * 具体的命令执行内容
  */
 public void excute() {
  System.out.println("out command");
 }

}

建立增加命令的借口

public interface AddCommandInterface {
 public void setCommand(CommandInterface comd);
 public CommandInterface getCommand();
}

public interface AddCommandInterface {
 public void setCommand(CommandInterface comd);
 public CommandInterface getCommand();
}

增加命令的实现类

public class OutAddCommand implements AddCommandInterface{

 private CommandInterface comd = null;

 /**
  * 获得命令
  */
 public CommandInterface getCommand() {

  return this.comd;
 }

 /**
  * 设置命令
  */
 public void setCommand(CommandInterface comd) {
  this.comd = comd;
 }

}

public class OutAddCommand implements AddCommandInterface{

 private CommandInterface comd = null;
 
 /**
  * 获得命令
  */
 public CommandInterface getCommand() {
  
  return this.comd;
 }

 /**
  * 设置命令
  */
 public void setCommand(CommandInterface comd) {
  this.comd = comd;
 }

}

建立事件激发借口

public interface ActionInterface {
 public void actionPerformed(AddCommandInterface comInter);
}

public interface ActionInterface {
 public void actionPerformed(AddCommandInterface comInter);
}

事件激发借口的实现类

public class ActionCommand implements ActionInterface{
 public void actionPerformed(AddCommandInterface comInter)
 {
  comInter.getCommand().excute();
 }
}

public class ActionCommand implements ActionInterface{
 public void actionPerformed(AddCommandInterface comInter)
 {
  comInter.getCommand().excute();
 }
}

对命令接口的实现

public class Actualize {

 private AddCommandInterface addCommand = null;

 public Actualize()
 {

 }

 /**
  * 增加命令
  * @param addCommand
  */
 public void addCommandInter(AddCommandInterface addCommand)
 {
  this.addCommand = addCommand;
 }

 /**
  * 执行命令
  * @param action
  */
 public void addAction(ActionInterface action)
 {
  action.actionPerformed(this.addCommand);
 }
}

public class Actualize {
 
 private AddCommandInterface addCommand = null;
 
 public Actualize()
 {
  
 }
 
 /**
  * 增加命令
  * @param addCommand
  */
 public void addCommandInter(AddCommandInterface addCommand)
 {
  this.addCommand = addCommand;
 }
 
 /**
  * 执行命令
  * @param action
  */
 public void addAction(ActionInterface action)
 {
  action.actionPerformed(this.addCommand);
 }
}

封装接口的实现

public class ExcuteCommand {
 public static void exec(CommandInterface com) {
  Actualize actu = new Actualize();

  OutAddCommand outAdd = new OutAddCommand();

  outAdd.setCommand(com);

  actu.addCommandInter(outAdd);

  actu.addAction(new ActionCommand());
 }
}

public class ExcuteCommand {
 public static void exec(CommandInterface com) {
  Actualize actu = new Actualize();
  
  OutAddCommand outAdd = new OutAddCommand();
  
  outAdd.setCommand(com);
  
  actu.addCommandInter(outAdd);
  
  actu.addAction(new ActionCommand());
 }
}

具体命令的调用

public class TestCommand {
 public static void main(String[] args)
 {
  OutCommand out = new OutCommand();
  ExcuteCommand.exec(out);

  InCommand in = new InCommand();
  ExcuteCommand.exec(in);
 }
}

public class TestCommand {
 public static void main(String[] args)
 {
  OutCommand out = new OutCommand();
  ExcuteCommand.exec(out);
  
  InCommand in = new InCommand();
  ExcuteCommand.exec(in);
 }
}

输出结果：

out command
int command

out command
int command