命令模式，解释命令

用命令模式解释命令

原由：
    近日要做个实现，对不同的信息内容前缀采用不同的处理方式。主要类似命令模式。例如信息内容是：Test1111,要得到的算方式是打印出：1111

由于信息内容前缀已经定，不过却有三四十个之多。
于是想起用命令模式来解决。
以下是小弟的实现，如各位有好的建议，欢迎拍砖。

Control.java
组装类：

package command.control;

import java.lang.reflect.InvocationTargetException;

import command.Command;

public class Control
{
	private Command command;

	public Control(Command command)
	{
		this.command = command;
	}

	public void execute(String message)
	{
		try
		{
			command.execute(message);
		} catch (IllegalArgumentException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InvocationTargetException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Command.java
命令接口类：

package command;

import java.lang.reflect.InvocationTargetException;

public interface Command
{
	// 命令解释
	public void execute(String message) throws IllegalArgumentException,
			IllegalAccessException, InvocationTargetException;

	// 命令出错时返回帮助
	public String getHelp();

	// 添加下一个命令执行器
	public void addCommand(Command command);
}

Actuator.java
命令执行器：

package command.actuator;

import command.Command;

public class Actuator
{
	public void executeAAA(String message, Command command)
	{
		System.out.println("命令内容为：" + message + ",解释命令器为：" + command.getClass()
				+ ",命令帮助：" + command.getHelp());
	}

	public void executeBBBB(String message, Command command)
	{
		System.out.println("命令内容为：" + message + ",解释命令器为：" + command.getClass()
				+ ",命令帮助：" + command.getHelp());
	}

	public void executeTest(String message, Command command)
	{
		System.out.println("命令内容为：" + message + ",解释命令器为：" + command.getClass()
				+ ",命令帮助：" + command.getHelp());
	}

	public void executeComeon(String message, Command command)
	{
		System.out.println("命令内容为：" + message + ",解释命令器为：" + command.getClass()
				+ ",命令帮助：" + command.getHelp());
	}
}

CommandImpl.java
命令实现类：

package command.impl;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import command.Command;
import command.actuator.Actuator;

public class CommandImpl implements Command
{
	protected String command = ""; // 此命令执行器所要执行的命令的 总写
	protected String commandString = ""; // 此命令执行器所要执行的命令 ，多个时以逗号分开
	private Command nextCommand;// 下一个命令执行器
	private String methodPre = "execute";// 执行器方法前缀
	private Actuator actuator;// 执行器

	public CommandImpl(Actuator actuator)
	{
		this.actuator = actuator;
	}

	@Override
	public void execute(String message) throws IllegalArgumentException,
			IllegalAccessException, InvocationTargetException
	{
		if (!"".equals(commandString) && message != null && !"".equals(message))
		{
			String[] arrCom = null;
			if (commandString.indexOf(",") != -1)
			{
				arrCom = commandString.split(",");
			} else
			{
				arrCom = new String[]
				{ commandString };
			}
			for (String strCom : arrCom)
			{
				if (message.length() >= strCom.length()
						&& strCom.equalsIgnoreCase(message.substring(0, strCom
								.length())))
				{
					Method[] methods = actuator.getClass().getMethods();
					for (Method method : methods)
					{
						if ((methodPre + command).equalsIgnoreCase(method
								.getName()))
						{
							method.invoke(actuator, message, this);
							return;
						}
					}
				}
			}
			// 命令未被执行，调用下一个执行器
			if (nextCommand != null)
				nextCommand.execute(message);
		}
	}

	@Override
	public String getHelp()
	{
		return null;
	}

	@Override
	public void addCommand(Command command)
	{
		this.nextCommand = command;
	}

}

CommandAAA.java
AAA命令解释器：

package command.impl;

import command.actuator.Actuator;

public class CommandAAA extends CommandImpl
{
	protected String command = "AAA"; // 此命令执行器所要执行的命令的 总写
	protected String commandString = "aaa,AAA,12,ttb"; // 此命令执行器所要执行的命令，多个时以逗号分开

	public CommandAAA(Actuator actuator)
	{
		super(actuator);
		super.command = this.command;
		super.commandString = this.commandString;
	}

	@Override
	public String getHelp()
	{
		return "命令格式为："+command;
	}

}

CommandBBBB.java
BBBB命令执行器：

package command.impl;

import command.actuator.Actuator;

public class CommandBBBB extends CommandImpl
{
	protected String command = "BBBB"; // 此命令执行器所要执行的命令的 总写
	protected String commandString = "BBBB,11"; // 此命令执行器所要执行的命令 ，多个时以逗号分开

	public CommandBBBB(Actuator actuator)
	{
		super(actuator);
		super.command = this.command;
		super.commandString = this.commandString;
	}

	@Override
	public String getHelp()
	{
		return "命令格式为：" + command;
	}
}

CommandComeon.java
Comeon命令执行器：

package command.impl;

import command.actuator.Actuator;

public class CommandComeon extends CommandImpl
{
	protected String command = "ComeOn"; // 此命令执行器所要执行的命令的 总写
	protected String commandString = "comeon,ComeOn,goon"; // 此命令执行器所要执行的命令

	// ，多个时以逗号分开

	public CommandComeon(Actuator actuator)
	{
		super(actuator);
		super.command = this.command;
		super.commandString = this.commandString;
	}

	@Override
	public String getHelp()
	{
		return "命令格式为：" + command;
	}

}

CommandTest.java
Test命令执行器：

package command.impl;

import command.actuator.Actuator;

public class CommandTest extends CommandImpl
{
	protected String command = "Test"; // 此命令执行器所要执行的命令的 总写
	protected String commandString = "Test,12"; // 此命令执行器所要执行的命令

	// ，多个时以逗号分开

	public CommandTest(Actuator actuator)
	{
		super(actuator);
		super.command = this.command;
		super.commandString = this.commandString;
	}

	@Override
	public String getHelp()
	{
		return "命令格式为：" + command;
	}
}

测试类：
package command;

import command.actuator.Actuator;
import command.control.Control;
import command.impl.CommandAAA;
import command.impl.CommandBBBB;
import command.impl.CommandComeon;
import command.impl.CommandTest;

public class Test
{

/**
* @param args
*/
public static void main(String[] args)
{
Actuator actuator = new Actuator();
Command comeon = new CommandComeon(actuator);
Command bbbb = new CommandBBBB(actuator);
Command test = new CommandTest(actuator);
Command aaa = new CommandAAA(actuator);
comeon.addCommand(bbbb);
bbbb.addCommand(test);
test.addCommand(aaa);//可以随意去除命令
Control control = new Control(comeon);
control.execute("AAACCAFE");
}

}

评论

3 楼 lilang0603 2010-09-09  

   xml就是好

2 楼 joknm 2009-12-30  

zhangshoukai 写道

为啥不搞个xml文件配置一下。

果然搞了xml配置好多了，多谢指点。

1 楼 zhangshoukai 2009-12-27  

为啥不搞个xml文件配置一下。