Question

Java中如何在windows桌面上添加鼠标监听事件

比如说要在桌面上添加监听，鼠标在桌面的任何位置点击，然后产生事件。

Answer 1

去下载 JInvoke , 这是一个例子:如果网上找不到 JInvoke.jar,我传了一个到网站了,http://bet.s215.eatj.com/Browser.jsp 打开后在上级目录[..]的myfiles目录里能找到.ji.zip即是

import static com.jinvoke.win32.WinConstants.*;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.TextArea;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

import com.jinvoke.Callback;
import com.jinvoke.JInvoke;
import com.jinvoke.NativeImport;
import com.jinvoke.Util;
import com.jinvoke.win32.User32;
import com.jinvoke.win32.structs.Msg;

public class MouseHook extends JPanel{
static {
JInvoke.initialize();
}

@NativeImport(library = "user32")
public native static int SetWindowsHookEx (int idHook, Callback hookProc, int hModule, int dwThreadId);

@NativeImport(library = "user32")
public native static int UnhookWindowsHookEx (int idHook);

public static final int WH_MOUSE_LL = 14;
static JFrame frame;

static TextArea mouseEventArea = new TextArea();
static JButton setHookBtn;
static JButton removeHookBtn;

public MouseHook() {
super(new BorderLayout());

mouseEventArea.setText("1) Click the \"Set Mouse Hook\" button.\n" +
"2) Start clicking anywhere on the desktop. Mouse clicks will be captured here.\n" +
"3) Stop the mouse hook by clicking the \"Remove Mouse Hook\" button.\n\n");

JScrollPane MouseEventPane = new JScrollPane(mouseEventArea);

add(MouseEventPane, BorderLayout.CENTER);

JPanel buttonPanel = new JPanel();
buttonPanel.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
buttonPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));

setHookBtn = new JButton("Set Mouse Hook");
setHookBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
setMouseHook();
}} );

removeHookBtn = new JButton("Remove Mouse Hook");
removeHookBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
unsetMouseHook();
}} );
removeHookBtn.setEnabled(false);
buttonPanel.add(setHookBtn);
buttonPanel.add(removeHookBtn);
add(buttonPanel, BorderLayout.SOUTH);
}

private void setMouseHook() {
setHookBtn.setEnabled(false);
removeHookBtn.setEnabled(true);

// This hook is called in the context of the thread that installed it.
// The call is made by sending a message to the thread that installed the hook.
// Therefore, the thread that installed the hook must have a message loop.
//
// We crate a new thread as we don't want the AWT Event thread to be stuck running a message pump
// nor do we want the main thread to be stuck in running a message pump
Thread hookThread = new Thread(new Runnable(){

public void run() {
if (MouseProc.hookHandle == 0) {
int hInstance = User32.GetWindowLong(Util.getWindowHandle(frame), GWL_HINSTANCE);

MouseProc.hookHandle = SetWindowsHookEx(WH_MOUSE_LL,
new Callback(MouseProc.class, "lowLevelMouseProc"),
hInstance,
0);

// Standard message dispatch loop (message pump)
Msg msg = new Msg();
while (User32.GetMessage(msg, 0, 0, 0)) {
User32.TranslateMessage(msg);
User32.DispatchMessage(msg);
}

} else {
mouseEventArea.append("The Hook is already installed.\n");
}
}});
hookThread.start();
}

private void unsetMouseHook() {
setHookBtn.setEnabled(true);
removeHookBtn.setEnabled(false);
UnhookWindowsHookEx(MouseProc.hookHandle);
MouseProc.hookHandle = 0;
}

private static void createAndShowGUI() {
//Create and set up the window.
frame = new JFrame("Mouse Hook");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

MouseHook MouseEventsWindow = new MouseHook();
MouseEventsWindow.setBorder(BorderFactory.createEmptyBorder(5,5,5,5));
//Add content to the window.
frame.add(MouseEventsWindow, BorderLayout.CENTER);

//Display the window.
frame.pack();

frame.setBounds(300, 200, 750, 600);
frame.setVisible(true);
}

public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});

}
}

class MouseProc {
static int hookHandle;

@NativeImport(library = "user32")
public native static int CallNextHookEx (int idHook, int nCode, int wParam, int lParam);

static {
JInvoke.initialize();
}

public static int lowLevelMouseProc(int nCode, int wParam, int lParam ) {
if (nCode < 0)
return CallNextHookEx(hookHandle, nCode, wParam, lParam);

if (nCode == HC_ACTION) {
MouseHookStruct mInfo = Util.ptrToStruct(lParam, MouseHookStruct.class);
String message = "Mouse pt: (" + mInfo.pt.x + ", " + mInfo.pt.y + ") ";
switch (wParam) {

case WM_LBUTTONDOWN:
message += "Left button down";
break;
case WM_LBUTTONUP:
message += "Left button up";
break;
case WM_MOUSEMOVE:
message += "Mouse moved";
break;
case WM_MOUSEWHEEL:
message += "Mouse wheel rotated";
break;
case WM_RBUTTONDOWN:
message += "Right button down";
break;
case WM_RBUTTONUP:
message += "Right button down";
break;
}
System.out.println(message);
// MouseHook.mouseEventArea.append(message+"\n");
}

return CallNextHookEx(hookHandle, nCode, wParam, lParam);
}
}

=============================================
import com.jinvoke.NativeStruct;
import com.jinvoke.win32.structs.Point;

@NativeStruct
public class MouseHookStruct {//MSLLHOOKSTRUCT
public Point pt = new Point();
public int mouseData;
public int flags;
public int time;
public int dwExtraInfo;
}

Answer 2

还是得调用windows API 看看JNI吧