去年寒假回家闲着无事,就在家中敲敲代码。主要是用java语言写一些小的运用：放大镜，屏幕截图
简单画图工具、取色器什么的,,最后整合成一个小型的软件。不过在这个过程中，发现java中实现屏幕
截图、取色的时候对于鼠标的操作还是显得有些不够，上面的功能一般是事先得到整个屏幕，之后再
在该图片上操作。这使得界面软件必须处于激活状态，很不方便。
其实，采用上面的那种操作实现功能也并不见得有多不好，不过兴趣使然，想看看java借助一些第
三方jar能否实现与windows底层的交互。因此，上网查了一下，总结如下：
通过查找,了解到了可以通过"鼠标钩子"实现,何为"钩子",下面为"扒来的":
钩子(Hook)，是Windows消息处理机制的一个平台，应用程序可以在上面设置子程以监视指定窗口的某种消息，而且所监视的窗口可以是其他进程所创建的。当消息到达后，在目标窗口处理函数之前处理它。钩子机制允许应用程序截获处理window消息或特定事件。钩子实际上是一个处理消息的程序段，通过系统调用，把它挂入系统。每当特定的消息发出，在没有到达 目的窗口前，钩子程序就先捕获该消息，亦即钩子函数先得到控制权。这时钩子函数即可以加工处理（改变）该消息，也可以不作处理而继续传递该消息，还可以强制结束消息的传递。Hook API是指Windows开放给程序员的编程接口，使得在用户级别下可以对操作系统进行控制，也就是一般的应用程序都需要调用API来完成某些功能，Hook API的意思就是在这些应用程序调用真正的系统API前可以先被截获，从而进行一些处理再调用真正的API来完成功能。1） 键盘钩子和低级键盘钩子可以监视各种键盘消息。（2） 鼠标钩子和低级鼠标钩子可以监视各种鼠标消息。（3） 外壳钩子可以监视各种Shell事件消息。比如启动和关闭应用程序。（4） 日志钩子可以记录从系统消息队列中取出的各种事件消息。（5） 窗口过程钩子监视所有从系统消息队列发往目标窗口的消息说了这么多概念性的东西,但是我们怎样用java实现鼠标钩子呢?这就需要借助jna来操作了JNA（Java Native Access ）提供一组Java工具类用于在运行期动态访问系统本地库（native library：如Window的dll）而不需要编写任何Native/JNI代码。开发人员只要在一个java接口中描述目标native library的函数与结构，JNA将自动实现Java接口到native function的映射。既然知道了实现的方法,那就动手吧,下面是我实现的代码,当然也有借鉴网上这方面的资料.MouseLLHook.javapackage com.kiritor; import java.awt.AWTException; import java.awt.Color; import java.awt.Cursor; import java.awt.MouseInfo; import java.awt.Point; import java.awt.Robot; import com.sun.jna.Pointer; import com.sun.jna.platform.win32.*; import com.sun.jna.platform.win32.WinUser.*; import com.sun.jna.platform.win32.WinDef.HMODULE; import com.sun.jna.platform.win32.WinDef.LRESULT; import com.sun.jna.platform.win32.WinDef.WPARAM; import com.sun.jna.platform.win32.WinUser.HHOOK; import com.sun.jna.platform.win32.WinUser.KBDLLHOOKSTRUCT; import com.sun.jna.platform.win32.WinUser.LowLevelKeyboardProc; public class MouseLLHook { private boolean flag; public ColorFrame getColorFrame() { return colorFrame; } public void setColorFrame(ColorFrame colorFrame) { this.colorFrame = colorFrame; } private static ColorFrame colorFrame = null; // 鼠标钩子函数里判断按键类型的常数 public static Point mousepoint; public static MouseInfo mouseInfo = null; static Color pixel = new Color(0, 0, 0); static Integer R = 0, G = 0, B = 0; static Integer X = 0, Y = 0; public static final int WM_LBUTTONUP = 514; public static final int WM_LBUTTONDOWN = 513; public static final int WM_RBUTTONUP = 517; public static final int WM_RBUTTONDOWN = 516; public static final int WM_MOUSEHWHEEL = 526; public static final int WM_MOUSEWHEEL = 522; public static final int WM_MOUSEMOVE = 512; static HHOOK mouseHHK, keyboardHHK;// 鼠标、键盘钩子的句柄 static LowLevelMouseProc mouseHook;// 鼠标钩子函数 static LowLevelKeyboardProc keyboardHook;// 键盘钩子函数 public MouseLLHook(ColorFrame colorFrame) { this.colorFrame=colorFrame; } // 安装钩子 static void setHook() { HMODULE hMod = Kernel32.INSTANCE.GetModuleHandle(null); mouseHHK = User32.INSTANCE.SetWindowsHookEx(WinUser.WH_MOUSE_LL, mouseHook, hMod, 0); mouseHHK.nativeType(); keyboardHHK = User32.INSTANCE.SetWindowsHookEx(WinUser.WH_KEYBOARD_LL, keyboardHook, hMod, 0); } // 卸载钩子 static void unhook() { User32.INSTANCE.UnhookWindowsHookEx(keyboardHHK); User32.INSTANCE.UnhookWindowsHookEx(mouseHHK); } public void getColor(String[] args) { keyboardHook = new LowLevelKeyboardProc() { @Override // 该函数参数的意思参考：http://msdn.microsoft.com/en-us/library/windows/desktop/ms644985(v=vs.85).aspx public LRESULT callback(int nCode, WPARAM wParam, KBDLLHOOKSTRUCT lParam) { int w = wParam.intValue(); // 按下alt键时w=.WM_SYSKEYDOWN; 按下其他大部分键时w=WinUser.WM_KEYDOWN if (w == WinUser.WM_KEYDOWN || w == WinUser.WM_SYSKEYDOWN) System.out.println("key down: vkCode = " + lParam.vkCode); else if (w == WinUser.WM_KEYUP || w == WinUser.WM_SYSKEYUP) System.out.println("key up: vkCode = " + lParam.vkCode); // 如果按下'q'退出程序，'q'的vkCode是81 if (lParam.vkCode == 81) { unhook(); System.err.println("program terminated."); System.exit(0); } return User32.INSTANCE.CallNextHookEx(keyboardHHK, nCode, wParam, lParam.getPointer()); } }; mouseHook = new LowLevelMouseProc() { @Override // 该函数参数的意思参考：http://msdn.microsoft.com/en-us/library/windows/desktop/ms644986(v=vs.85).aspx public LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam) { switch (wParam.intValue()) { case WM_MOUSEMOVE: //System.out.print("mouse moved:"); break; case WM_LBUTTONDOWN: { try { Robot robot = new Robot(); mousepoint = mouseInfo.getPointerInfo().getLocation(); // System.out.println(mousepoint); pixel = robot.getPixelColor(mousepoint.x, mousepoint.y); X = mousepoint.x; Y = mousepoint.y; R = pixel.getRed(); G = pixel.getGreen(); B = pixel.getBlue(); String s16 = "#" + Integer.toHexString(R) + Integer.toHexString(G) + Integer.toHexString(B);// 得到颜色的十六进制表示。 Color col = new Color(R, G, B); if(colorFrame.isFlag()==false) { colorFrame.getRedText().setText(R.toString()); colorFrame.getGreenText().setText(G.toString()); colorFrame.getBlueText().setText(B.toString()); colorFrame.getColor16Text().setText(s16); colorFrame.getNewColor().setBackground(col); colorFrame.setFlag(true); } colorFrame.setVisible(true); } catch (AWTException ex) { ex.printStackTrace(); } } break; case WM_LBUTTONUP: //System.out.print("mouse left button up"); break; case WM_RBUTTONUP: //System.out.print("mouse right button up:"); break; case WM_RBUTTONDOWN: //System.out.print("mouse right button down:"); break; case WM_MOUSEWHEEL: //System.out.print("mouse wheel rotated:"); break; } //System.out.println("(" + lParam.pt.x + "," + lParam.pt.y + ")"); return User32.INSTANCE.CallNextHookEx(mouseHHK, nCode, wParam, lParam.getPointer()); } }; setHook(); int result; MSG msg = new MSG(); // 消息循环 // 实际上while循环一次都不执行，这些代码的作用我理解是让程序在GetMessage函数这里阻塞，不然程序就结束了。 while ((result = User32.INSTANCE.GetMessage(msg, null, 0, 0)) != 0) { if (result == -1) { System.err.println("error in GetMessage"); unhook(); break; } else { User32.INSTANCE.TranslateMessage(msg); User32.INSTANCE.DispatchMessage(msg); } } unhook(); } }
package com.kiritor; import com.sun.jna.Structure; import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR; import com.sun.jna.platform.win32.WinDef.HWND; import com.sun.jna.platform.win32.WinDef.LRESULT; import com.sun.jna.platform.win32.WinDef.WPARAM; import com.sun.jna.platform.win32.WinUser.HOOKPROC; import com.sun.jna.platform.win32.WinUser.POINT; interface LowLevelMouseProc extends HOOKPROC { LRESULT callback(int nCode, WPARAM wParam, MOUSEHOOKSTRUCT lParam); } public class MOUSEHOOKSTRUCT extends Structure { public class ByReference extends MOUSEHOOKSTRUCT implements Structure.ByReference { }; public POINT pt; public HWND hwnd; public int wHitTestCode; public ULONG_PTR dwExtraInfo; } ColorFrame.java
package com.kiritor; import java.awt.AWTException; import java.awt.BorderLayout; import java.awt.Color; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.GraphicsDevice; import java.awt.GraphicsEnvironment; import java.awt.Image; import java.awt.Menu; import java.awt.MenuItem; import java.awt.PopupMenu; import java.awt.Rectangle; import java.awt.Robot; import java.awt.SystemTray; import java.awt.Toolkit; import java.awt.TrayIcon; import java.awt.datatransfer.StringSelection; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JWindow; public class ColorFrame extends JWindow { private boolean flag= false; public boolean isFlag() { return flag; } public void setFlag(boolean flag) { this.flag = flag; } private JLabel color16 = null; private JLabel color16Text = null; private JLabel red = null; private JLabel redText = null; private JLabel green = null; private JLabel greenText = null; private JLabel blue = null; private JLabel blueText = null; private JPanel newColor = null; private JLabel newLabel = null; private int xx; private int yy; private boolean isDraging; private TrayIcon trayIcon; private JPanel bgJPanel = null; private ImageIcon bg = new ImageIcon(getClass().getClassLoader() .getResource("images/bg.png")); /** * 剪贴板工作区 */ // 复制到剪贴板的按钮 private JLabel jiantieban = null; private ImageIcon jiantiebanIcon = new ImageIcon(getClass() .getClassLoader().getResource("images/jiantieban.png")); private ImageIcon jiantiebanIcon_entered = new ImageIcon(getClass() .getClassLoader().getResource("images/jiantieban_entered.png")); // 重新取色的按钮 private JLabel getAgain = null; private ImageIcon getAgainIcon = new ImageIcon(getClass().getClassLoader() .getResource("images/getagain.png")); private ImageIcon getAgainIcon_entered = new ImageIcon(getClass() .getClassLoader().getResource("images/getagain_entered.png")); // 取消操作的按钮 private JLabel cancel = null; private ImageIcon cancelIcon = new ImageIcon(getClass().getClassLoader() .getResource("images/cancel.png")); private ImageIcon cancel_entered = new ImageIcon(getClass() .getClassLoader().getResource("images/cancel_entered.png")); public ColorFrame(){} public ColorFrame(int x,int y) { setLocation(x, y); } public void showUI() { init(); setSize(150, 150); setLayout(null); setAlwaysOnTop(true); addMouseListener(new MouseAdapter() { public void mousePressed(MouseEvent e) { requestFocus(); isDraging = true; xx = e.getX(); yy = e.getY(); } public void mouseReleased(MouseEvent e) { isDraging = false; } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub setFlag(true);//窗体内部暂时设置为不能取色 } }); addMouseMotionListener(new MouseMotionAdapter() { public void mouseDragged(MouseEvent e) { if (isDraging) { int left = getLocation().x; int top = getLocation().y; setLocation(left + e.getX() - xx, top + e.getY() - yy); } } }); setVisible(true); // // TestEvent t = new TestEvent(this); // t.setLayout(null); // t.add(bgJPanel); // this.getContentPane().add( t); add(bgJPanel); //setLocationRelativeTo(null); } public void init() { bgJPanel = new JPanel() { public void paintComponent(Graphics g) { super.paintComponent(g); g.drawImage(bg.getImage(), 0, 0, null); this.setOpaque(false); } }; bgJPanel.setOpaque(false); bgJPanel.setLayout(null); bgJPanel.setBounds(0, 0, 150, 150); newColor = new JPanel(); newLabel = new JLabel("颜色"); newLabel.setFont(new Font("华文楷体", 0, 12)); newLabel.setBounds(30, 10, 30, 20); newColor.setBounds(20, 35, 50, 50); newColor.setBackground(Color.gray); red = new JLabel("Red:"); red.setFont(new Font("华文楷体", 0, 12)); red.setBounds(80, 35, 30, 10); redText = new JLabel("sdf"); redText.setFont(new Font("华文楷体", 0, 12)); redText.setBounds(115, 35, 30, 10); green = new JLabel("Green:"); green.setFont(new Font("华文楷体", 0, 12)); green.setBounds(80, 53, 40, 10); greenText = new JLabel("sdf"); greenText.setFont(new Font("华文楷体", 0, 12)); greenText.setBounds(115, 53, 30, 10); blue = new JLabel("Blue:"); blue.setFont(new Font("华文楷体", 0, 12)); blue.setBounds(80, 71, 30, 10); blueText = new JLabel("sdf"); blueText.setFont(new Font("华文楷体", 0, 12)); blueText.setBounds(115, 71, 30, 10); color16 = new JLabel("十六进制:"); color16.setBounds(20, 95, 45, 10); color16.setFont(new Font("华文楷体", 0, 10)); color16Text = new JLabel("#aaaa"); color16Text.setBounds(70, 95, 60, 10); color16Text.setFont(new Font("华文楷体", 0, 12)); color16Text.setForeground(Color.red); /** 工作区按钮初始化的地方 */ //剪贴板操作 jiantieban = new JLabel(jiantiebanIcon_entered); jiantieban.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { // TODO Auto-generated method stub setClipboard(color16Text.getText()); } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub jiantieban.setIcon(jiantiebanIcon); setFlag(true); } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub jiantieban.setIcon(jiantiebanIcon_entered); } }); jiantieban.setBounds(10, 115, 40, 20); //重新拾取操作 getAgain = new JLabel(getAgainIcon_entered); getAgain.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { // TODO Auto-generated method stub setFlag(false); setVisible(false); } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub getAgain.setIcon(getAgainIcon); } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub getAgain.setIcon(getAgainIcon_entered); } }); getAgain.setBounds(55, 115, 40, 20); //取消操作按钮的操作 cancel = new JLabel(cancel_entered); cancel.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { setVisible(false); } @Override public void mouseEntered(MouseEvent e) { // TODO Auto-generated method stub cancel.setIcon(cancelIcon); } @Override public void mouseExited(MouseEvent e) { // TODO Auto-generated method stub cancel.setIcon(cancel_entered); } }); cancel.setBounds(100, 115, 40, 20); bgJPanel.add(newLabel); bgJPanel.add(newColor); bgJPanel.add(red); bgJPanel.add(redText); bgJPanel.add(green); bgJPanel.add(greenText); bgJPanel.add(blue); bgJPanel.add(blueText); bgJPanel.add(color16); bgJPanel.add(color16Text); bgJPanel.add(jiantieban); bgJPanel.add(getAgain); bgJPanel.add(cancel); } public JPanel getNewColor() { return newColor; } public void setNewColor(JPanel newColor) { this.newColor = newColor; } public JLabel getColor16Text() { return color16Text; } public void setColor16Text(JLabel color16Text) { this.color16Text = color16Text; } public JLabel getRedText() { return redText; } public void setRedText(JLabel redText) { this.redText = redText; } public JLabel getGreenText() { return greenText; } public void setGreenText(JLabel greenText) { this.greenText = greenText; } public JLabel getBlueText() { return blueText; } public void setBlueText(JLabel blueText) { this.blueText = blueText; } public void getColor(String[] args) { new MouseLLHook(this).getColor(null); } public static void main(String[] args) { ColorFrame colorFrame = new ColorFrame(); colorFrame.showUI(); MouseLLHook hook = new MouseLLHook(colorFrame); hook.getColor(null); } /*复制到剪贴板中去*/ public void setClipboard(String str) { StringSelection ss = new StringSelection(str); Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null); } } 由于一些图片文件丢失,界面效果图就不贴了!
该程序要用到的jar包
转载于:https://blog.51cto.com/kiritor/1226759
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