剪切板练习

最新推荐文章于 2024-02-14 19:37:03 发布

piaopiaopiaopiaopiao

最新推荐文章于 2024-02-14 19:37:03 发布

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分类专栏： java

本文链接：https://blog.youkuaiyun.com/piaopiaopiaopiaopiao/article/details/16953293

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本文展示了如何使用Java的本地剪贴板API实现对象的复制与粘贴功能，包括创建、封装和读取Person对象的过程。

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package aa;

import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;

class Person
{
	private String name;
	private int age;

	public Person(){}

	public Person(String name , int age)
	{
		this.name = name;
		this.age = age;
	}
	// name的setter和getter方法
	public void setName(String name)
	{
		this.name = name;
	}
	public String getName()
	{
		 return this.name;
	}

	// age的setter和getter方法
	public void setAge(int age)
	{
		this.age = age;
	}
	public int getAge()
	{
		 return this.age;
	}
	public String toString()
	{
		return "Person[ name=" + name + " , age=" + age + " ]";
	}
}
public class CopyPerson
{
	Frame f = new Frame("复制对象");
	Button copy = new Button("复制");
	Button paste = new Button("粘贴");
	TextField name = new TextField(15);
	TextField age = new TextField(15);
	TextArea ta = new TextArea(3 , 30);
	// 创建本地的剪贴板
	Clipboard clipboard = new Clipboard("cp");
	public void init()
	{
		Panel p = new Panel();
		p.add(new Label("姓名"));
		p.add(name);
		p.add(new Label("年龄"));
		p.add(age);
		f.add(p , BorderLayout.NORTH);
		f.add(ta);
		Panel bp = new Panel();
		// 为“复制”按钮添加事件监听器
		copy.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				copyPerson();
			}
		});
		// 为“粘贴”按钮添加事件监听器
		paste.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				try
				{
					readPerson();
				}
				catch (Exception ee)
				{
					ee.printStackTrace();
				}
			}
		});
		bp.add(copy);
		bp.add(paste);
		f.add(bp , BorderLayout.SOUTH);
		f.pack();
		f.setVisible(true);
	}
	public void copyPerson()
	{
		// 以name,age文本框的内容创建Person对象
		Person p = new Person(name.getText()
			, Integer.parseInt(age.getText()));
		// 将Person对象封装成LocalObjectSelection对象
		LocalObjectSelection ls = new LocalObjectSelection(p);
		// 将LocalObjectSelection对象放入本地剪贴板
		clipboard.setContents(ls , null);
	}
	public void readPerson()throws Exception
	{
		// 创建保存Person对象引用的DataFlavor对象
		DataFlavor peronFlavor = new DataFlavor(
			"application/x-java-jvm-local-objectref;class=aa.Person");
		// 取出本地剪贴板内的内容
		if (clipboard.isDataFlavorAvailable(DataFlavor.stringFlavor))
		{
			Person p = (Person)clipboard.getData(peronFlavor);
			ta.setText(p.toString());
		}
	}
	public static void main(String[] args)
	{
		new CopyPerson().init();
	}
}

-------------------------------------------------------------------------------------------------------------------------------------

package aa;

import java.awt.datatransfer.*;

public class LocalObjectSelection implements Transferable
{
	// 持有一个对象的引用
	private Object obj;
	public LocalObjectSelection(Object obj)
	{
		this.obj = obj;
	}
	// 返回该Transferable对象支持的DataFlavor
	public DataFlavor[] getTransferDataFlavors()
	{
		DataFlavor[] flavors = new DataFlavor[2];
		//获取被封装对象的类型
		Class<? extends Object> clazz = obj.getClass();
		String mimeType = "application/x-java-jvm-local-objectref;"
			+ "class=" + clazz.getName();
		try
		{
			flavors[0] = new DataFlavor(mimeType);
			flavors[1] = DataFlavor.stringFlavor;
			return flavors;
		}
		catch (ClassNotFoundException e)
		{
			e.printStackTrace();
			return null;
		}
	}
	// 取出该Transferable对象封装的数据
	public Object getTransferData(DataFlavor flavor)
		throws UnsupportedFlavorException
	{
		if(!isDataFlavorSupported(flavor))
		{ 
			throw new UnsupportedFlavorException(flavor);
		} 
		if (flavor.equals(DataFlavor.stringFlavor))
		{
			return obj.toString();
		}
		return obj;
	}
	public boolean isDataFlavorSupported(DataFlavor flavor)
	{
		return flavor.equals(DataFlavor.stringFlavor) ||
			flavor.getPrimaryType().equals("application")
			&& flavor.getSubType().equals("x-java-jvm-local-objectref")
			&& flavor.getRepresentationClass().isAssignableFrom(obj.getClass());
	}
}

运行结果：

注意：

当不打包时，即注释掉：package aa; 那么

DataFlavor peronFlavor = new DataFlavor("application/x-java-jvm-local-objectref;class=aa.Person");

须改为：

DataFlavor peronFlavor = new DataFlavor("application/x-java-jvm-local-objectref;class=Person");

否则找不到Person类。

改写的程序：

package aa;

import java.awt.*;
import java.awt.event.*;
import java.awt.datatransfer.*;

class Person
{
	private String name;
	private int age;

	public Person(){}

	public Person(String name , int age)
	{
		this.name = name;
		this.age = age;
	}
	// name的setter和getter方法
	public void setName(String name)
	{
		this.name = name;
	}
	public String getName()
	{
		 return this.name;
	}

	// age的setter和getter方法
	public void setAge(int age)
	{
		this.age = age;
	}
	public int getAge()
	{
		 return this.age;
	}
	public String toString()
	{
		return "Person[ name=" + name + " , age=" + age + " ]";
	}
}
public class CopyPerson
{
	Frame f = new Frame("复制对象");
	Button copy = new Button("复制");
	Button paste = new Button("粘贴");
	TextField name = new TextField(15);
	TextField age = new TextField(15);
	TextArea ta = new TextArea(3 , 30);
	// 创建本地的剪贴板
	Clipboard clipboard = new Clipboard("cp");
	public void init()
	{
		Panel p = new Panel();
		p.add(new Label("姓名"));
		p.add(name);
		p.add(new Label("年龄"));
		p.add(age);
		f.add(p , BorderLayout.NORTH);
		f.add(ta);
		Panel bp = new Panel();
		// 为“复制”按钮添加事件监听器
		copy.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				copyPerson();
			}
		});
		// 为“粘贴”按钮添加事件监听器
		paste.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				try
				{
					readPerson();
				}
				catch (Exception ee)
				{
					ee.printStackTrace();
				}
			}
		});
		bp.add(copy);
		bp.add(paste);
		f.add(bp , BorderLayout.SOUTH);
		f.pack();
		f.setVisible(true);
	}
	public void copyPerson()
	{
		// 以name,age文本框的内容创建Person对象
		Person p = new Person(name.getText()
			, Integer.parseInt(age.getText()));
		// 将Person对象封装成LocalObjectSelection对象
		LocalObjectSelection ls = new LocalObjectSelection(p);
		// 将LocalObjectSelection对象放入本地剪贴板
		clipboard.setContents(ls , null);
	}
	public void readPerson()throws Exception
	{
		// 创建保存Person对象引用的DataFlavor对象
		DataFlavor peronFlavor = new DataFlavor(
			"application/x-java-jvm-local-objectref;class=aa.Person");
		// 取出本地剪贴板内的内容
		if (clipboard.isDataFlavorAvailable(peronFlavor))
		{
			Person p = (Person)clipboard.getData(peronFlavor);
			ta.setText(p.toString());
		}
	}
	public static void main(String[] args)
	{
		new CopyPerson().init();
	}
}

--------------------------------------------------------------------------------------------------------------------

package aa;

import java.awt.datatransfer.*;

public class LocalObjectSelection implements Transferable
{
	// 持有一个对象的引用
	private Object obj;
	public LocalObjectSelection(Object obj)
	{
		this.obj = obj;
	}
	// 返回该Transferable对象支持的DataFlavor
	public DataFlavor[] getTransferDataFlavors()
	{
		DataFlavor[] flavors = new DataFlavor[2];
		//获取被封装对象的类型
		Class<? extends Object> clazz = obj.getClass();
		String mimeType = "application/x-java-jvm-local-objectref;"
			+ "class=" + clazz.getName();
		try
		{
			flavors[0] = new DataFlavor(mimeType);
			return flavors;
		}
		catch (ClassNotFoundException e)
		{
			e.printStackTrace();
			return null;
		}
	}
	// 取出该Transferable对象封装的数据
	public Object getTransferData(DataFlavor flavor)
		throws UnsupportedFlavorException
	{
		if(!isDataFlavorSupported(flavor))
		{ 
			throw new UnsupportedFlavorException(flavor);
		}
		return obj;
	}
	public boolean isDataFlavorSupported(DataFlavor flavor)
	{
		return 	flavor.getPrimaryType().equals("application")
				&& flavor.getSubType().equals("x-java-jvm-local-objectref")
				&& flavor.getRepresentationClass().isAssignableFrom(obj.getClass());
	}
}