JNA鼠标事件监听java

JNA（Java Native Access）是一个用于在Java中调用本地（native）方法的框架。要监听鼠标事件，可以使用JNA来调用Windows API中的鼠标事件相关函数。

以下是一个简单的示例代码，演示如何使用JNA监听鼠标事件：

import com.sun.jna.Native;
import com.sun.jna.Pointer;
import com.sun.jna.platform.win32.WinDef;
import com.sun.jna.platform.win32.WinUser;
import com.sun.jna.platform.win32.WinUser.HHOOK;
import com.sun.jna.platform.win32.WinUser.KBDLLHOOKSTRUCT;
import com.sun.jna.platform.win32.WinUser.LowLevelMouseProc;
import com.sun.jna.platform.win32.WinUser.MSG;

public class MouseHook {

    private static HHOOK hhk;
    private static LowLevelMouseProc mouseHook;
    private static User32 lib;

    public static void main(String[] args) {
        lib = User32.INSTANCE;
        WinDef.HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null);
        mouseHook = new LowLevelMouseProc() {
            public WinDef.LRESULT callback(int nCode, WinDef.WPARAM wParam, WinUser.MSLLHOOKSTRUCT info) {
                if (nCode >= 0) {
                    switch (wParam.intValue()) {
                    case WinUser.WM_LBUTTONDOWN:
                        System.out.println("Left button down");
                        break;
                    case WinUser.WM_LBUTTONUP:
                        System.out.println("Left button up");
                        break;
                    case WinUser.WM_MOUSEMOVE:
                        System.out.println("Mouse move");
                        break;
                    case WinUser.WM_MOUSEWHEEL:
                        System.out.println("Mouse wheel");
                        break;
                    case WinUser.WM_RBUTTONDOWN:
                        System.out.println("Right button down");
                        break;
                    case WinUser.WM_RBUTTONUP:
                        System.out.println("Right button up");
                        break;
                    }
                }
                return lib.CallNextHookEx(hhk, nCode, wParam, info.getPointer());
            }
        };
        hhk = lib.SetWindowsHookEx(WinUser.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 interface User32 extends StdCallLibrary {
        User32 INSTANCE = (User32) Native.loadLibrary("user32", User32.class);
        int WH_MOUSE_LL = 14;

        public interface LowLevelMouseProc extends HOOKPROC {
            public WinDef.LRESULT callback(int nCode, WinDef.WPARAM wParam, WinUser.MSLLHOOKSTRUCT lParam);
        }

        HHOOK SetWindowsHookEx(int idHook, LowLevelMouseProc lpfn, WinDef.HMODULE hMod, WinDef.DWORD dwThreadId);

        WinDef.LRESULT CallNextHookEx(HHOOK hhk, int nCode, WinDef.WPARAM wParam, Pointer lParam);

        boolean UnhookWindowsHookEx(HHOOK hhk);

        boolean GetMessage(MSG msg, WinDef.HWND hWnd, int wMsgFilterMin, int wMsgFilterMax);

        boolean TranslateMessage(MSG lpMsg);

        LRESULT DispatchMessage(MSG lpMsg);
    }

    public interface Kernel32 extends StdCallLibrary {
        public static final Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("kernel32", Kernel32.class);

        WinDef.HMODULE GetModuleHandle(String name);
    }
}

该示例代码使用JNA调用了Windows API中的SetWindowsHookEx函数来安装鼠标事件钩子，并使用了LowLevelMouseProc回调函数来处理鼠标事件。在回调函数中，根据wParam的值来判断鼠标事件类型，并做出相应的处理。

需要注意的是，本示例代码仅在Windows操作系统上运行。如果要在其他操作系统上运行，需要修改回调函数中的处理逻辑。