您可以使用JNA
Ctrl-C在前台窗口上实际模拟（复制操作），然后读取剪贴板中的内容，之后，您只需要还原剪贴板中的内容即可。
这是一个简短的示例：
import java.awt.Toolkit;import java.awt.datatransfer.Clipboard;import java.awt.datatransfer.ClipboardOwner;import java.awt.datatransfer.DataFlavor;import java.awt.datatransfer.StringSelection;import java.awt.datatransfer.Transferable;import com.sun.jna.Native;import com.sun.jna.platform.win32.User32;import com.sun.jna.platform.win32.WinDef.HWND;import com.sun.jna.win32.StdCallLibrary;public class Foo implements ClipboardOwner { public interface CustomUser32 extends StdCallLibrary { CustomUser32 INSTANCE = (CustomUser32) Native.loadLibrary("user32", CustomUser32.class); HWND GetForegroundWindow(); void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo); } public void lostOwnership(Clipboard clipboard, Transferable contents) { // dummy: needed for `ClipboardOwner` } void controlC(CustomUser32 customUser32) { customUser32.keybd_event((byte) 0x11 , (byte) 0, 0, 0); customUser32.keybd_event((byte) 0x43 , (byte) 0, 0, 0); customUser32.keybd_event((byte) 0x43 , (byte) 0, 2 , 0); customUser32.keybd_event((byte) 0x11 , (byte) 0, 2 , 0);// 'Left Control Up } String getClipboardText() throws Exception { return (String) Toolkit.getDefaultToolkit().getSystemClipboard().getData(DataFlavor.stringFlavor); } void setClipboardText(String data) throws Exception { Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new StringSelection(data), this); } String getSelectedText(User32 user32, CustomUser32 customUser32) throws Exception { HWND hwnd = customUser32.GetForegroundWindow(); char[] windowText = new char[512]; user32.GetWindowText(hwnd, windowText, 512); String windowTitle = Native.toString(windowText); System.out.println("Will take selected text from the following window: [" + windowTitle + "]"); String before = getClipboardText(); controlC(customUser32); // emulate Ctrl C Thread.sleep(100); // give it some time String text = getClipboardText(); System.out.println("Currently in clipboard: " + text); // restore what was previously in the clipboard setClipboardText(before); return text; } public static void main(String[] args) throws Exception { Foo foo = new Foo(); Thread.sleep(2000); // take some time for you to select something anywhere System.out.println(foo.getSelectedText(User32.INSTANCE, CustomUser32.INSTANCE)); }}运行它时，您将有两秒钟的时间在任何应用程序中的某处选择一些文本，然后通常将其打印出来。
将从以下窗口中获取选定的文本：[java-突出显示的监视器文本-堆栈溢出-Google Chrome]
当前在剪贴板中：我正在为正在计划的项目集思广益
您不需要接受我的回答，只是向您展示我在上面的评论中所说的话。
