java鼠标钩子实现

java本身是没有提供直接访问系统的API方法，查了下资料，要实现鼠标钩子有3种方法，
1、使用JNI方法，需要自己写C实现，比较复杂。
2、使用swt extension，直接提供了鼠标钩子的实现，但是用它调用其它windows api，没有成功，放弃了使用它。
3、使用JNA，JNA是建立在JNI 技术之上的，简化了Java访问window api的方法。
考虑到要调用其它window api的原因，选用了JNA，顺便写一个JNA实现鼠标钩子的测试例子：

public class MouseHook extends JFrame { private static final long serialVersionUID = 1L; public static final int WM_MOUSEMOVE = 512; public static final int WM_LBUTTONDOWN = 513; public static final int WM_LBUTTONUP = 514; public static final int WM_RBUTTONDOWN = 516; public static final int WM_RBUTTONUP = 517; public static final int WM_MBUTTONDOWN = 519; public static final int WM_MBUTTONUP = 520; private static HHOOK hhk; private static LowLevelMouseProc mouseHook; private JLabel labelX; private JLabel labelY; private JPanel contentPane; public static void main(String[] args) { final MouseHook frame = new MouseHook(); frame.setVisible(true); final User32 lib = User32.INSTANCE; HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null); mouseHook = new LowLevelMouseProc() { public LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT info) { if (nCode >= 0) { switch (wParam.intValue()) { case MouseHook.WM_MOUSEMOVE: System.err.println("in callback, x=" + info.pt.x + " y=" + info.pt.y); frame.getLabelX().setText(String.valueOf(info.pt.x)); frame.getLabelY().setText(String.valueOf(info.pt.y)); } } return lib .CallNextHookEx(hhk, nCode, wParam, info.getPointer()); } }; hhk = lib.SetWindowsHookEx(User32.WH_MOUSE_LL, mouseHook, hMod, 0); int result; MSG msg = new MSG(); while ((result = lib.GetMessage(msg, null, 0, 0)) != 0) { if (result == -1) { System.err.println("error in get message"); break; } else { System.err.println("got message"); lib.TranslateMessage(msg); lib.DispatchMessage(msg); } } lib.UnhookWindowsHookEx(hhk); } public MouseHook() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); JLabel lblX = new JLabel("X:"); lblX.setFont(new Font("宋体", Font.PLAIN, 14)); lblX.setBounds(46, 33, 22, 27); contentPane.add(lblX); JLabel lblY = new JLabel("Y:"); lblY.setFont(new Font("宋体", Font.PLAIN, 14)); lblY.setBounds(144, 39, 17, 15); contentPane.add(lblY); labelX = new JLabel(""); labelX.setBounds(65, 39, 54, 15); contentPane.add(labelX); labelY = new JLabel(""); labelY.setBounds(160, 39, 54, 15); contentPane.add(labelY); } public JLabel getLabelX() { return labelX; } public void setLabelX(JLabel labelX) { this.labelX = labelX; } public JLabel getLabelY() { return labelY; } public void setLabelY(JLabel labelY) { this.labelY = labelY; } public interface LowLevelMouseProc extends HOOKPROC { LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam); } public class Point extends Structure { public class ByReference extends Point implements Structure.ByReference { }; public com.sun.jna.NativeLong x; public com.sun.jna.NativeLong y; } public static class MOUSEHOOKSTRUCT extends Structure { public static class ByReference extends MOUSEHOOKSTRUCT implements Structure.ByReference { }; public User32.POINT pt; public User32.HWND hwnd; public int wHitTestCode; public User32.ULONG_PTR dwExtraInfo; } }

 

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