Clipboard
.
In Java, there are actually two kinds of Clipboard
- system
and local. The following example uses the system Clipboard
.
It corresponds to the usual idea of sharing data between otherwise independent
applications running on the same computer.
Local Clipboard
s are visible only within a single Java
application. They are created by simply passing a name to
the Clipboard
constructor
.
import java.awt.datatransfer.Clipboard; import java.awt.datatransfer.ClipboardOwner; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.StringSelection; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.Toolkit; import java.io.*; public final class TextTransfer implements ClipboardOwner { /** Simple test harness. */ public static void main(String... args){ TextTransfer textTransfer = new TextTransfer(); //display what is currently on the clipboard log("Clipboard contains:" + textTransfer.getClipboardContents()); //change the contents and then re-display textTransfer.setClipboardContents("blah, blah, blah"); log("Clipboard contains:" + textTransfer.getClipboardContents()); } /** * Empty implementation of the ClipboardOwner interface. */ @Override public void lostOwnership(Clipboard clipboard, Transferable contents){ //do nothing } /** * Place a String on the clipboard, and make this class the * owner of the Clipboard's contents. */ public void setClipboardContents(String string){ StringSelection stringSelection = new StringSelection(string); Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard(); clipboard.setContents(stringSelection, this); } /** * Get the String residing on the clipboard. * * @return any text found on the Clipboard; if none found, return an * empty String. */ public String getClipboardContents() { String result = ""; Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard(); //odd: the Object param of getContents is not currently used Transferable contents = clipboard.getContents(null); boolean hasTransferableText = (contents != null) && contents.isDataFlavorSupported(DataFlavor.stringFlavor) ; if (hasTransferableText) { try { result = (String)contents.getTransferData(DataFlavor.stringFlavor); } catch (UnsupportedFlavorException | IOException ex){ System.out.println(ex); ex.printStackTrace(); } } return result; } private static void log(String msg) { System.out.println(msg); } }
>java -cp . TextTransfer
Clipboard contains:Java is in Indonesia.
Clipboard contains:blah, blah, blah
>