添加水印，改变鼠标图标，简笔画功能

添加水印所用到方法

改添加素材

如图，创建包img.icon和img.picture，并且从资源包里复制图片素材到该包

DrawPictureFrame.java

package com.mr.draw;/*** 略略略略略略略*///添加水印
import java.awt.AlphaComposite;
import java.awt.Font;//设置字体
import javax.swing.JOptionPane;//
//改变图标功能
import java.awt.Image;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.Cursor;public class DrawPictureFrame extends JFrame implements FrameGetShape{//继承窗体类//水印private JMenuItem shuiyinMenuItem;//水印菜单private String shuiyin ="";//水印字符内容//简笔画private PictureWindow picWindow;//简笔画展示窗体 private JButton showPicButton;//展开简笔画/*** 构造方法，添加组件的初始化方法*/public DrawPictureFrame() {setResizable(false);                            //窗体不能改变大小setTitle("画图程序(水印内容：["+ shuiyin+ "])");//设置标题，添加水印内容setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//窗口关闭则停止程序setBounds(500,100,574,460);                    //设置窗口位置 Bounds:边界init();                                       //组件初始化  init();addListener();                                //添加组件监听}//DrawPictureFrame()结束/*** 组件初始化*/private void init() {/*** 略略略略略略略*/toolBar =new JToolBar();//初始化工具栏getContentPane().add(toolBar,BorderLayout.NORTH);//工具栏放至船体北方//简笔画放到保存前面showPicButton =new JButton("展开简笔画");//初始化按钮对象，并添加文本内容toolBar.add(showPicButton);工具栏添加按钮/*** 略略略略略略略*/JMenu systemMenu =new JMenu("系统");//初始化菜单对象，并添加文本内容menuBar.add(systemMenu);//菜单栏添加菜单对象shuiyinMenuItem =new JMenuItem("设置水印");systemMenu.add(shuiyinMenuItem);}
}private void addListener() {/*** 略略略略略略略*///mouseDragged结束public void mouseMoved(final MouseEvent arg0) {if (rubber) {//如果使用橡皮//设置鼠标指针的图形为图片Toolkit kit = Toolkit.getDefaultToolkit();//获得系统默认的组件工具包//使用工具包获得图片Image img=kit.createImage("src/img/icon/鼠标橡皮.png");//使用工具包创建一个自定义的光标对象//参数为图片，光标热点写成0.0，和鼠标描述字符串Cursor c =kit.createCustomCursor(img,new Point(0,0),"clear");setCursor(c);//使用自定义的光标}else {//设置鼠标指针的形状为十字光体setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));}}//mouseMoved结束});//addMouseMotion结束toolBar.addMouseMotionListener(new MouseMotionAdapter() {//工具栏添加鼠标移动监听public void mouseMoved(final MouseEvent arg0) {//设置鼠标指针为默认光标setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));    }});//toolBar.addMouseMotionListener结束canvas.addMouseListener(new MouseAdapter() {//画板添加鼠标单击事件监听public void mouseReleased(final MouseEvent arg0) {//当按键抬起时x=-1;  //将记录上一次鼠标绘制点的横坐标恢复成-1y=-1;  //将记录上一次鼠标绘制点的纵坐标恢复成-1}//mouseReleased结束//addMouseListener结束//保存图片saveButton.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent argo) {//单击时addWatermark();//添加水印DrawImageUtil.saveImage(DrawPictureFrame.this,image);//打印图片：打印当前窗体（DrawPictureFrame.this）为图片}});saveMenuItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {//单击时addWatermark();//添加水印DrawImageUtil.saveImage(DrawPictureFrame.this,image);//打印图片：打印当前窗体（DrawPictureFrame.this）为图片}});//设置水印shuiyinMenuItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {//单击时//弹出对话框shuiyin=JOptionPane.showInputDialog(DrawPictureFrame.this,"你想添加的水印：");if (null == shuiyin) {shuiyin ="";//字符串为空内容}else {//如果不是nullsetTitle("画图程序(水印内容:[" +shuiyin+"])");//修改窗体标题}}});
}//addlistener()结束/** 添加水印*/private void addWatermark() {if(!"".equals(shuiyin.trim())) {//如果水印字段不是空字符串g.rotate(Math.toRadians(-30));//将照片旋转-30Font font =new Font("楷体",Font.BOLD,72);//设置字体g.setFont(font);//载入字体g.setColor(Color.GRAY);//使用灰色AlphaComposite alpha=AlphaComposite.SrcOver.derive(0.4f);//设置透明效果g.setComposite(alpha);//使用透明效果g.drawString(shuiyin,150,500);//绘制文字canvas.repaint();//画板重绘g.rotate(Math.toRadians(30));//将旋转的图片转回来alpha =AlphaComposite.SrcOver.derive(1f);//不透明g.setComposite(alpha);//使用不透明效果g.setColor(foreColor);//画笔恢复之前颜色}//if结束}

添加简笔画

创建PictureWindow.java

package com.mr.draw;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Image;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JWindow;
import com.mr.util.BackgroundPanel;/** 简笔画展示窗体*/
public class PictureWindow extends JWindow { private JButton changeButton;  更换图片按钮private JButton hiddenButton;  //隐藏按钮private BackgroundPanel centerPanel;//展示图片的带背景图画板File list[];//当前选中的图片索引int index;  //父窗体DrawPictureFrame frame;/** 构造方法* @param frame父窗体*/public PictureWindow(DrawPictureFrame frame) {this.frame =frame;//构造参数的值赋值给父窗口setSize(400,460);  //设置窗体宽高init(); //初始化窗体组件addListener(); //给组件添加监听}//PictureWindow/** 组件初始化方法*/private void init() {Container c=getContentPane(); //获取窗体主容器File dir =new File("src/img/picture");  //创建简笔画素材文件夹对象list =dir.listFiles();//获取文件夹里的所有文件//初始化背景面板，使用图片文件夹里的第一张简笔画centerPanel =new BackgroundPanel(getListImage());c.add(centerPanel,BorderLayout.CENTER);FlowLayout flow =new FlowLayout(FlowLayout.RIGHT);//创建右对齐的流布局flow.setHgap(20);//水平间隔20像素JPanel southPanel =new JPanel();//创建南部面板southPanel.setLayout(flow);//南部面板使用刚才创建好的流布局changeButton =new JButton("更换图片");//实例化"更换图片"按钮southPanel.add(changeButton);//南部面板添加按钮hiddenButton =new JButton("隐藏");//实例化"隐藏"按钮southPanel.add(hiddenButton);//南部面板添加按钮c.add(southPanel,BorderLayout.SOUTH);//南部面板放到主容器的南部位置位置}//init结束/** 添加监听*/private void addListener() {hiddenButton.addActionListener(new ActionListener() {//隐藏按钮添加动作监听public void actionPerformed(ActionEvent e) {//单击时setVisible(false);//本窗体不可见frame.initShowPicButton();//父窗体还原简笔画按钮文本的内容}});//hiddenButton结束changeButton.addActionListener(new ActionListener() {//隐藏按钮添加动作监听public void actionPerformed(ActionEvent e) {//单击时centerPanel.setImage(getListImage());//背景面板重新载入图片}});//changeButton.addActionListener结束}//addListeners结束/** 获取图片文件夹下的图片，每次调用此方法，都会获得不同的文件对象*/private Image getListImage() {String imgPath =list[index].getAbsolutePath();//获取当前索引下的图片文件路径ImageIcon image =new ImageIcon(imgPath);//获取此图片文件的图标对象index++;//索引变量递增if(index >=list.length) {//如果索引变量超过图片数量index =0;//索引归零}return image.getImage();//获得图标对象的图片对象}//getListImage结束}//PictureWindow 结束

功能实现

按钮美化

DrawPictureFrame.java

package com.mr.draw;/*** 略略略略略略略*/
import javax.swing.ImageIcon;//后面的直接复制粘贴了//引入窗体类//alt+/   快速导入public class DrawPictureFrame extends JFrame implements FrameGetShape{//继承窗体类//创建一个8位BGR颜色分量的图像BufferedImage image =new BufferedImage(570,390,BufferedImage.TYPE_INT_BGR);Graphics gs=image.getGraphics();//获得图像的绘画对象Graphics2D g=(Graphics2D) gs;  //获得绘画对象转换为Graphics2D类型DrawPictureCanvas canvas =new DrawPictureCanvas();//创建画布对象Color foreColor=Color.BLACK;//定义前景色 棕色Color backgroundColor =Color.WHITE; //定义背景色 白色//鼠标事件int x=-1;             //上次鼠标绘制点的横坐标int y=-1;             //上次鼠标绘制点的纵坐标boolean rubber=false; //橡皮标识变量private JToolBar toolBar;//工具栏private JButton eraserButton;//橡皮private JToggleButton strokeButton1;//细线按钮private JToggleButton strokeButton2;//粗线按钮private JToggleButton strokeButton3;//较粗按钮private JButton backgroundButton;//背景色按钮private JButton foregroundButton;//前背景色按钮private JButton clearButton;//清除按钮private JButton saveButton;//保存按钮private JButton shapeButton;//图像按钮boolean drawShape =false;//画图形标志变量Shapes shape;//绘制图形//菜单private JMenuItem strokeMenuItem1;//细线菜单private JMenuItem strokeMenuItem2;//粗线菜单private JMenuItem strokeMenuItem3;//较粗private JMenuItem clearMenuItem;//清除菜单private JMenuItem foregroundMenuItem;//前景菜单private JMenuItem backgroundMenuItem;   private JMenuItem eraserMenuItem;//橡皮菜单private JMenuItem exitMenuItem;//跳出菜单private JMenuItem saveMenuItem;//保存菜单//水印private JMenuItem shuiyinMenuItem;//水印菜单private String shuiyin ="";//水印字符内容//简笔画private PictureWindow picWindow;//简笔画展示窗体 private JButton showPicButton;//展开简笔画/*** 构造方法，添加组件的初始化方法*/public DrawPictureFrame() {setResizable(false);                            //窗体不能改变大小setTitle("画图程序(水印内容：["+ shuiyin+ "])");//设置标题，添加水印内容setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//窗口关闭则停止程序setBounds(500,100,574,460);                    //设置窗口位置 Bounds:边界init();                                       //组件初始化  init();addListener();                                //添加组件监听}//DrawPictureFrame()结束/*** 组件初始化*/private void init() {g.setColor(backgroundColor);//用背景色设置绘图对象的颜色g.fillRect(0, 0, 570, 390);//使用背景色填充整个画布g.setColor(foreColor);     //设置画布的图像canvas.setImage(image);//设置画布的图像getContentPane().add(canvas);//将画布添加到窗体容器默认布局的中部位置toolBar =new JToolBar();//初始化工具栏getContentPane().add(toolBar,BorderLayout.NORTH);//工具栏放至船体北方//简笔画//showPicButton =new JButton("展开简笔画");//初始化按钮对象，并添加文本内容showPicButton =new JButton();showPicButton.setToolTipText("展开简笔画");//设置鼠标悬停提示showPicButton.setIcon(new ImageIcon("src/img/icon/展开.png"));//设置鼠标图案toolBar.add(showPicButton);工具栏添加按钮//saveButton=new JButton("保存");//初始化按钮对象，并添加文本内容saveButton=new JButton();saveButton.setToolTipText("保存");saveButton.setIcon(new ImageIcon("src/img/icon/保存.png"));toolBar.add(saveButton);//工具栏添加按钮toolBar.addSeparator();//添加分割线//初始化有选中状态的按钮对象，并添加文本strokeButton1 =new JToggleButton();strokeButton1.setToolTipText("细线");strokeButton1.setIcon(new ImageIcon("src/img/icon/1像素线条.png"));strokeButton1.setSelected(true);//细线按钮处于选中状态toolBar.add(strokeButton1);//工具栏添加按钮strokeButton2 =new JToggleButton();strokeButton2.setToolTipText("粗线");strokeButton2.setIcon(new ImageIcon("src/img/icon/2像素线条.png"));toolBar.add(strokeButton2);//工具栏添加按钮strokeButton3 =new JToggleButton();strokeButton3.setToolTipText("较粗");strokeButton3.setIcon(new ImageIcon("src/img/icon/4像素线条.png"));//把上面三个按顺序，画笔粗细按钮组，保证同时只有一个按钮被选中ButtonGroup strokeGroup =new ButtonGroup();strokeGroup.add(strokeButton1);//按钮组添加按钮strokeGroup.add(strokeButton2);strokeGroup.add(strokeButton3);toolBar.add(strokeButton3);//工具栏添加按钮toolBar.addSeparator();//添加分割线backgroundButton=new JButton("");//初始化按钮对象，并添加文本内容backgroundButton.setToolTipText("背景颜色");backgroundButton.setIcon(new ImageIcon("src/img/icon/背景色.png"));toolBar.add(backgroundButton);//工具栏添加按钮foregroundButton =new JButton();foregroundButton.setToolTipText("画笔颜色");foregroundButton.setIcon(new ImageIcon("src/img/icon/前景色.png"));toolBar.add(foregroundButton);toolBar.addSeparator();//添加分割线shapeButton =new JButton();shapeButton.setToolTipText("图形");shapeButton.setIcon(new ImageIcon("src/img/icon/形状.png"));toolBar.add(shapeButton);clearButton =new JButton();clearButton.setToolTipText("清除");clearButton.setIcon(new ImageIcon("src/img/icon/清除.png"));toolBar.add(clearButton);eraserButton =new JButton();eraserButton.setToolTipText("橡皮");eraserButton.setIcon(new ImageIcon("src/img/icon/橡皮.png"));toolBar.add(eraserButton);//工具栏添加按钮//添加菜单栏JMenuBar menuBar=new JMenuBar();//创建菜单栏setJMenuBar(menuBar);//窗体载入菜单栏//系统内容JMenu systemMenu =new JMenu("系统");//初始化菜单对象，并添加文本内容menuBar.add(systemMenu);//菜单栏添加菜单对象shuiyinMenuItem =new JMenuItem("设置水印");systemMenu.add(shuiyinMenuItem);saveMenuItem=new JMenuItem("保存");systemMenu.add(saveMenuItem);//菜单添加菜单项//创建简笔画展示画笔，并将本类当作它的父窗体picWindow =new PictureWindow(DrawPictureFrame.this);systemMenu.addSeparator();//添加分割线exitMenuItem =new JMenu("退出");//systemMenu.add(exitMenuItem);JMenu strokeMenu=new JMenu("线型");//初始菜单对象，并添加文本内容menuBar.add(strokeMenu);//菜单添加菜单对象strokeMenuItem1 =new JMenuItem("细线");strokeMenu.add(strokeMenuItem1);strokeMenuItem2 =new JMenuItem("粗线");strokeMenu.add(strokeMenuItem2);strokeMenuItem3 =new JMenuItem("较粗");strokeMenu.add(strokeMenuItem3);JMenu colorMenu =new JMenu("颜色");menuBar.add(colorMenu);foregroundMenuItem=new JMenuItem("画笔颜色");colorMenu.add(foregroundMenuItem);backgroundMenuItem=new JMenuItem("背景颜色");colorMenu.add(backgroundMenuItem);JMenu editMenu =new JMenu("编辑");menuBar.add(editMenu);clearMenuItem =new JMenuItem("清除");editMenu.add(clearMenuItem);eraserMenuItem =new JMenuItem("橡皮");editMenu.add(eraserMenuItem);}//init()结束/*** 为组件添加鼠标移动事件监听*/private void addListener() {//画板添加鼠标移动事件监听canvas.addMouseMotionListener(new MouseMotionAdapter() {public void mouseDragged(final MouseEvent e) {   //当鼠标拖拽时if(x>0 && y>0) {   //如果x和y存在鼠标记录if(rubber) {   //橡皮标识为true，表示使用橡皮g.setColor(backgroundColor);   //绘图工具使用背景色g.fillRect(x, y,10,10);//在鼠标划过的位置画填充的正方形}else {g.drawLine(x, y,e.getX(),e.getY());//在鼠标划过的位置画直线}}//if结束x=e.getX();y=e.getY();canvas.repaint();  //更新画布}public void mouseMoved(final MouseEvent arg0) {if (rubber) {//如果使用橡皮//设置鼠标指针的图形为图片Toolkit kit = Toolkit.getDefaultToolkit();//获得系统默认的组件工具包//使用工具包获得图片Image img=kit.createImage("src/img/icon/鼠标橡皮.png");//使用工具包创建一个自定义的光标对象//参数为图片，光标热点写成0.0，和鼠标描述字符串Cursor c =kit.createCustomCursor(img,new Point(0,0),"clear");setCursor(c);//使用自定义的光标}else {//设置鼠标指针的形状为十字光体setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));}}//mouseMoved结束});//addMouseMotion结束toolBar.addMouseMotionListener(new MouseMotionAdapter() {//工具栏添加鼠标移动监听public void mouseMoved(final MouseEvent arg0) {//设置鼠标指针为默认光标setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));    }});//toolBar.addMouseMotionListener结束canvas.addMouseListener(new MouseAdapter() {//画板添加鼠标单击事件监听public void mouseReleased(final MouseEvent arg0) {//当按键抬起时x=-1;  //将记录上一次鼠标绘制点的横坐标恢复成-1y=-1;  //将记录上一次鼠标绘制点的纵坐标恢复成-1}//mouseReleased结束//添加鼠标按下时触发的方法,图形public void mousePressed(MouseEvent e) {if (drawShape) {//如果此时我鼠标画的是图形switch(shape.getType()) {//判断图形的种类case Shapes.YUAN://如果是圆形//计算坐标，让鼠标处于图形的中心位置int yuanX =e.getX() -shape.getWidth()/2;int yuanY =e.getY() -shape.getHeigth()/2;//创建圆形，并指定坐标和宽高Ellipse2D yuan=new Ellipse2D.Double(yuanX,yuanY,shape.getWidth(),shape.getHeigth());g.draw(yuan);//画图工具画此圆形break;case Shapes.FANG://计算坐标，让鼠标处于图形的中心位置int fangX =e.getX() -shape.getWidth()/2;int fangY =e.getY() -shape.getHeigth()/2;//创建方形,并指定坐标和宽高Rectangle2D fang =new Rectangle2D.Double(fangX,fangY,shape.getWidth(),shape.getHeigth());g.draw(fang);break;}canvas.repaint();//更新画笔//画图形标识变量为false ，说明选择鼠标画的是图形drawShape=false;//画完图形之后，回到画笔状态}}//图形结束});//结束canvas.addMouseListenerstrokeButton1.addActionListener(new ActionListener() {//"细线“按钮添加动作监听public void actionPerformed(final ActionEvent arg0) {//单击时//声明画笔属性，粗细为1像素，线条末端无修饰，折线处呈尖角BasicStroke bs =new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);g.setStroke(bs);//画图工具使用此画笔}});strokeButton2.addActionListener(new ActionListener() {//"细线“按钮添加动作监听public void actionPerformed(final ActionEvent arg0) {//单击时//声明画笔属性，粗细为2像素，线条末端无修饰，折线处呈尖角BasicStroke bs =new BasicStroke(2,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);g.setStroke(bs);//画图工具使用此画笔}});strokeButton3.addActionListener(new ActionListener() {//"细线“按钮添加动作监听public void actionPerformed(final ActionEvent arg0) {//单击时//声明画笔属性，粗细为3像素，线条末端无修饰，折线处呈尖角BasicStroke bs =new BasicStroke(3,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);g.setStroke(bs);//画图工具使用此画笔}});//背景颜色backgroundButton.addActionListener(new ActionListener() {//背景色按钮添加动作监听：ActionListenerpublic void actionPerformed(final ActionEvent arg0) {//单击时打开颜色对话框，参数依次为：父窗体，标题，默认选中的颜色（青色）Color bgColor =JColorChooser.showDialog(DrawPictureFrame.this,"颜色对话框",Color.CYAN);if (bgColor !=null) {//如果选中的颜色不是空的backgroundColor=bgColor;//将选中的颜色赋给背景色变量}//背景色按钮也更换为这种颜色backgroundButton.setBackground(backgroundColor);g.setColor(backgroundColor);//绘图工具使用颜色g.fillRect(0,0,570,390);//画一个背景颜色的方形填满整个画布g.setColor(foreColor);//画图工具使用前景色canvas.repaint();//更新画布}});//backgroundButton.addActionListener结束//画笔颜色--前景色foregroundButton.addActionListener(new ActionListener() {//背景色按钮添加动作监听：ActionListenerpublic void actionPerformed(final ActionEvent arg0) {//单击时打开颜色对话框，参数依次为：父窗体，标题，默认选中的颜色（青色）Color fColor =JColorChooser.showDialog(DrawPictureFrame.this,"颜色对话框",Color.CYAN);if (fColor !=null) {//如果选中的颜色不是空的backgroundColor=fColor;//将选中的颜色赋给背景色变量}//背景色按钮也更换为这种颜色foregroundButton.setBackground(foreColor);g.setColor(foreColor);//绘图工具使用颜色}});//清除与橡皮按钮事件实现clearButton.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent arg0) {g.setColor(backgroundColor);g.fillRect(0,0,570,390);//画一个背景颜色的方形填满整个画布，实现清除功能g.setColor(foreColor);//画图工具使用画笔颜色canvas.repaint();//更新画布}});eraserButton.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent arg0) {if(rubber){//单击按钮，使用橡皮eraserButton.setToolTipText("橡皮");//鼠标悬停显示//设置鼠标图案eraserButton.setIcon(new ImageIcon("src/img/icon/橡皮.png"));eraserMenuItem.setText("橡皮");g.setColor(foreColor);rubber = false;}else {eraserMenuItem.setText("画图");eraserButton.setToolTipText("画图");//设置鼠标按钮eraserButton.setIcon(new ImageIcon("src/img/icon/画笔.png"));g.setColor(backgroundColor);rubber =true;}}});//橡皮结束//图形shapeButton.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {//单击时ShapeWindow shapeWindow=new ShapeWindow(DrawPictureFrame.this);//创建图形选择组件int shapeButtonWidth = shapeButton.getWidth();//获取图形按钮宽度int shapeWindowWidth = shapeWindow.getWidth();//获取图形按钮高度int shapeButtonX =shapeButton.getX();//获取图形按钮横坐标int shapeButtonY =shapeButton.getY();//获取图形按钮纵坐标//计算图形组件横坐标，让组件与“图形”按钮居中对齐int shapeWindowX =getX() +shapeButtonX-(shapeWindowWidth -shapeButtonWidth)/2;//计算图形组件纵坐标，让组件与“图形”按钮下方int shapeWindowY =getY()+shapeButtonY+80;//设置图形组件坐标位置shapeWindow.setLocation(shapeWindowX,shapeWindowY);shapeWindow.setVisible(true);//图形可见}});//图形结束//保存图片saveButton.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent argo) {//单击时addWatermark();//添加水印DrawImageUtil.saveImage(DrawPictureFrame.this,image);//打印图片：打印当前窗体（DrawPictureFrame.this）为图片}});/*** 菜单监听，基本和前面的一样，修改为saveMenuItem.*/saveMenuItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {//单击时addWatermark();//添加水印DrawImageUtil.saveImage(DrawPictureFrame.this,image);//打印图片：打印当前窗体（DrawPictureFrame.this）为图片}});//设置水印shuiyinMenuItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {//单击时//弹出对话框shuiyin=JOptionPane.showInputDialog(DrawPictureFrame.this,"你想添加的水印：");if (null == shuiyin) {shuiyin ="";//字符串为空内容}else {//如果不是nullsetTitle("画图程序(水印内容:[" +shuiyin+"])");//修改窗体标题}}});//清除与橡皮按钮事件实现clearMenuItem.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent arg0) {g.setColor(backgroundColor);g.fillRect(0,0,570,390);//画一个背景颜色的方形填满整个画布，实现清除功能g.setColor(foreColor);//画图工具使用画笔颜色canvas.repaint();//更新画布}});eraserMenuItem.addActionListener(new ActionListener() {public void actionPerformed(final ActionEvent arg0) {if(rubber) {eraserButton.setToolTipText("橡皮");//鼠标悬停显示eraserButton.setIcon(new ImageIcon("src/img/icon/橡皮.png"));eraserMenuItem.setText("橡皮");g.setColor(foreColor);rubber =false;}else {eraserButton.setToolTipText("画图");//鼠标悬停显示eraserButton.setIcon(new ImageIcon("src/img/icon/画笔.png"));eraserMenuItem.setText("画图");g.setColor(backgroundColor);rubber =true;}}});//橡皮结束//背景颜色backgroundMenuItem.addActionListener(new ActionListener() {//背景色按钮添加动作监听：ActionListenerpublic void actionPerformed(final ActionEvent arg0) {//单击时打开颜色对话框，参数依次为：父窗体，标题，默认选中的颜色（青色）Color bgColor =JColorChooser.showDialog(DrawPictureFrame.this,"颜色对话框",Color.CYAN);if (bgColor !=null) {//如果选中的颜色不是空的backgroundColor=bgColor;//将选中的颜色赋给背景色变量}//背景色按钮也更换为这种颜色backgroundButton.setBackground(backgroundColor);g.setColor(backgroundColor);//绘图工具使用颜色g.fillRect(0,0,570,390);//画一个背景颜色的方形填满整个画布g.setColor(foreColor);//画图工具使用前景色canvas.repaint();//更新画布}});//backgroundButton.addActionListener结束//画笔颜色--前景色foregroundMenuItem.addActionListener(new ActionListener() {//背景色按钮添加动作监听：ActionListenerpublic void actionPerformed(final ActionEvent arg0) {//单击时打开颜色对话框，参数依次为：父窗体，标题，默认选中的颜色（青色）Color bgColor =JColorChooser.showDialog(DrawPictureFrame.this,"颜色对话框",Color.CYAN);if (bgColor !=null) {//如果选中的颜色不是空的backgroundColor=bgColor;//将选中的颜色赋给背景色变量}//背景色按钮也更换为这种颜色foregroundButton.setBackground(foreColor);//画笔颜色也更换为这种颜色g.setColor(backgroundColor);//绘图工具使用颜色}});    strokeMenuItem1.addActionListener(new ActionListener() {//"细线“按钮添加动作监听public void actionPerformed(final ActionEvent arg0) {//单击时//声明画笔属性，粗细为1像素，线条末端无修饰，折线处呈尖角BasicStroke bs =new BasicStroke(1,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);g.setStroke(bs);//画图工具使用此画笔strokeButton1.setSelected(true);//细线按钮为选中状态}});strokeMenuItem2.addActionListener(new ActionListener() {//"细线“按钮添加动作监听public void actionPerformed(final ActionEvent arg0) {//单击时//声明画笔属性，粗细为2像素，线条末端无修饰，折线处呈尖角BasicStroke bs =new BasicStroke(2,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);g.setStroke(bs);//画图工具使用此画笔strokeButton2.setSelected(true);}});strokeMenuItem3.addActionListener(new ActionListener() {//"细线“按钮添加动作监听public void actionPerformed(final ActionEvent arg0) {//单击时//声明画笔属性，粗细为3像素，线条末端无修饰，折线处呈尖角BasicStroke bs =new BasicStroke(3,BasicStroke.CAP_BUTT,BasicStroke.JOIN_MITER);g.setStroke(bs);//画图工具使用此画笔strokeButton3.setSelected(true);}});//画笔结束//简笔画showPicButton.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {boolean isVisible =picWindow.isVisible();//获取简笔画展示窗体可见状态if(isVisible){//如果简笔画展示窗体是可见的showPicButton.setToolTipText("展开简笔画");showPicButton.setIcon(new ImageIcon("src/img/icon/展开.png"));picWindow.setVisible(false);//隐藏简笔画展示窗体}else {showPicButton.setToolTipText("隐藏简笔画");showPicButton.setIcon(new ImageIcon("src/img/icon/隐藏.png"));//重新指定简笔画展示窗体的显示位置//横坐标 =主窗体横坐标 -简笔画窗体宽度-5//纵坐标 =主窗体纵坐标picWindow.setLocation(getX()-picWindow.getWidth()-5,getY());picWindow.setVisible(true);//简笔画展示窗体可见}}});//showPicButton.addActionListener结束}//组件监听结束/** 恢复展开简笔画按钮的文本内容，此方法共简笔画画笔的”隐藏“按钮可调用*/public void initShowPicButton() {showPicButton.setToolTipText("展开简笔画");showPicButton.setIcon(new ImageIcon("src/img/icon/展开.png"));}//initShowPicButton结束/** 添加水印*/private void addWatermark() {if(!"".equals(shuiyin.trim())) {//如果水印字段不是空字符串g.rotate(Math.toRadians(-30));//将照片旋转-30Font font =new Font("楷体",Font.BOLD,72);//设置字体g.setFont(font);//载入字体g.setColor(Color.GRAY);//使用灰色AlphaComposite alpha=AlphaComposite.SrcOver.derive(0.4f);//设置透明效果g.setComposite(alpha);//使用透明效果g.drawString(shuiyin,150,500);//绘制文字canvas.repaint();//画板重绘g.rotate(Math.toRadians(30));//将旋转的图片转回来alpha =AlphaComposite.SrcOver.derive(1f);//不透明g.setComposite(alpha);//使用不透明效果g.setColor(foreColor);//画笔恢复之前颜色}//if结束}//FrameGetShape接口实现类，用于获得图形空间返回的被选中的图形@Overridepublic void getShape(Shapes shape) {this.shape =shape;//将反回的图形对象赋给类的全局变量drawShape =true; //画图形标识变量为true，声明现在鼠标画的是图形，而不是线条    }//结束public static void main(String[] args) {DrawPictureFrame frame=new DrawPictureFrame();//创建窗体对象frame.setVisible(true);//让窗口可见}//main()结束//主类结束}

好啦，本次项目就做到这里啦，期待下一项吧~