很牛的Java截图工具源码

import java.awt.BorderLayout; import java.awt.Container; import java.awt.Graphics; import java.awt.Image; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.WindowConstants; public class TestFrame extends JFrame implements ActionListener { /** * */ JFileChooser fileDialog=new JFileChooser("D:"); Container rootPane=new Container(); JTextField srcfie=new JTextField(12); JButton srcbtn=new JButton("选择图片"); JTextField savefie=new JTextField(12); JButton savebtn=new JButton("保存图片"); JButton jtbtn=new JButton("截图"); JLabel label=new JLabel("宽度：000 高度：000"); //显示图片大小 BufferedImage targetImg;//用来保存图片 ImgPanel imgPane=new ImgPanel(); //用来显示图片 public TestFrame(){ super("心林小屋-Java截图软件"); this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); this.init(); this.addLister(); } public void init(){ Container rootPane=this.getContentPane(); rootPane.setLayout(new BorderLayout()); //设置文件对话框的过滤器 MyFileFilter mf=new MyFileFilter(); String[] str={".jpg",".gif",".bmp",".png"}; mf.addFilter(str,"选择文件(*.jpg,*.gif,*.bmp,*.png)"); this.fileDialog.addChoosableFileFilter(mf); jtbtn.setMnemonic(KeyEvent.VK_A); //设置快捷建 ALT+A JPanel pane1=new JPanel(); pane1.add(srcfie); pane1.add(srcbtn); pane1.add(savefie); pane1.add(savebtn); pane1.add(jtbtn); pane1.add(label); imgPane.setBorder(BorderFactory.createEtchedBorder()); rootPane.add(pane1,BorderLayout.NORTH); rootPane.add(imgPane,BorderLayout.CENTER); this.setSize(750, 600); this.setLocation(300, 300); this.show(true); } public void addLister(){ this.srcbtn.addActionListener(this); this.savebtn.addActionListener(this); this.jtbtn.addActionListener(this); } public static void main(String[] args) { // ImageUtils iu=new ImageUtils(); // iu.saveTo(120,120,"d://Love.png", "d://2.jpg"); TestFrame tf=new TestFrame(); } // 单击srcbtn 按钮 public void srcbtnClick(){ this.fileDialog.setDialogTitle("选择图片"); if(this.fileDialog.showOpenDialog(this)==0){ try { this.srcfie.setText(this.fileDialog.getSelectedFile().getPath()); targetImg = ImageIO.read(this.fileDialog.getSelectedFile()); drawImg(); } catch (IOException e) { // TODO Auto-generated catch block JOptionPane.showMessageDialog(this, "对不起，图片出现异常"); e.printStackTrace(); } } } // 单击savebtn 按钮 public void savebtnClick(){ if(targetImg==null){ JOptionPane.showMessageDialog(this, "对不起，暂无图片可以保存"); return; } this.fileDialog.setDialogTitle("保存图片"); if(this.fileDialog.showSaveDialog(this)==0){ try { File f=fileDialog.getSelectedFile(); if(f.exists()){ int i=JOptionPane.showConfirmDialog(this, "该文件已存在,是否覆盖此文件!!!","友情提示",JOptionPane.OK_OPTION); if(i!=0){ return; } } String path=f.getPath(); String str=path.substring(path.lastIndexOf("."),path.length()); if(!(str.equals(".jpg") || str.equals(".gif") || str.equals(".bmp") || str.equals(".png"))){ f=new File(f.getPath()+".jpg"); } ImageIO.write(targetImg, "jpg",f); this.savefie.setText(f.getPath()); JOptionPane.showMessageDialog(this, "图片保存成功"); } catch (Exception e) { JOptionPane.showMessageDialog(this, "对不起，图片保存失败"); e.printStackTrace(); } } } // public void drawImg(){ int width=targetImg.getWidth(); int height=targetImg.getHeight(); if(width>2000 ||height>2000){ JOptionPane.showMessageDialog(this, "对不起，图片太大"); return; } this.label.setText("宽度："+width+" 高度："+height); imgPane.mydraw(targetImg); } //截图按钮事件 public void jtbtnClick(){ try { this.setVisible(false); Thread.sleep(100); JTFrame jt=new JTFrame(this); jt.setVisible(true); } catch (InterruptedException e) { e.printStackTrace(); } } // 事件方法 public void actionPerformed(ActionEvent e) { if(e.getSource().equals(srcbtn)){ this.srcbtnClick(); }else if(e.getSource().equals(savebtn)){ this.savebtnClick(); }else if(e.getSource().equals(jtbtn)){ jtbtnClick(); } } } class ImgPanel extends JPanel{ private BufferedImage img; public void paintComponent(Graphics g) { // TODO Auto-generated method stub super.paintComponent(g); if(img!=null){ int width=this.getWidth(); int heigth=this.getHeight(); BufferedImage temp=Resize.resize(img,width,heigth); int imgw=temp.getWidth(); int imgh=temp.getHeight(); int x=(width/2)-(imgw/2); int y=(heigth/2)-(imgh/2); g.drawImage(temp,x, y,x+imgw,y+imgh,0,0,imgw,imgh, null); } } public void mydraw(BufferedImage image){ this.img=image; this.repaint(); } }