JFrame實現無邊框，實現拖動，實現關閉按鈕，開啟實現儲存檔案到本地，實現頭像放大功能，實現圖片瀏覽器
阿新 • • 發佈：2019-01-22
package SwingTest3; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionAdapter; import java.awt.event.MouseWheelEvent; import java.awt.event.MouseWheelListener; import java.io.File; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; public class FrameTest extends JFrame implements ActionListener, MouseListener, MouseWheelListener { /** * */ private static final long serialVersionUID = 1L; JPanel jp; JLabel jl; JButton jb1, jb2, jb3, jb4; ImageIcon imgIco, showii; float width; float height; void init() { jp = new JPanel(); jp.setLayout(null); jp.setBackground(new Color(0, 0, 0, 50)); jb1 = new JButton(); jb1.setIcon(new ImageIcon("img/bigger.png")); jb1.addActionListener(this); jb1.setBounds(280, 475, 42, 28); jb2 = new JButton(); jb2.setIcon(new ImageIcon("img/smaller.png")); jb2.addActionListener(this); jb2.setBounds(320, 475, 42, 28); jb3 = new JButton(); jb3.setIcon(new ImageIcon("img/save.png")); jb3.addActionListener(this); jb3.setBounds(360, 475, 42, 28); // 關閉按鈕 jb4 = new JButton(); jb4.setIcon(new ImageIcon("img/closeButton.png")); jb4.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { System.exit(0); } }); jb4.setBounds(675, 0, 25, 25); jl = new JLabel("", JLabel.CENTER); jl.setBounds(50, 50, 600, 400); jl.addMouseWheelListener(this); //jl.addMouseListener(this); jp.addMouseListener(this); //jp.addMouseMotionListener(this); jp.add(jb1); jp.add(jb2); jp.add(jb3); jp.add(jb4); jp.add(jl); this.add(jp); // 去邊框 this.setUndecorated(true); // 必須先去邊框再新增背景色 this.setBackground(new Color(0, 0, 0, 50)); this.setSize(700, 500); this.setLocation(300, 200); this.setVisible(true); // 下面這行程式碼如果解除安裝上面註釋的位置會報錯 } public static void main(String[] args) { FrameTest ft = new FrameTest(); ft.init(); ft.imgIco = ft.getAvatar("zhujiannan", 0); ft.ShowImg(); } // 拖動邊框 int xOld = 0; int yOld = 0; public FrameTest() { // this.setLayout(null); // System.out.println("aaa"); // 處理拖動事件 this.addMouseListener(new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { xOld = e.getX(); yOld = e.getY(); } }); this.addMouseMotionListener(new MouseMotionAdapter() { @Override public void mouseDragged(MouseEvent e) { int xOnScreen = e.getXOnScreen(); int yOnScreen = e.getYOnScreen(); int xx = xOnScreen - xOld; int yy = yOnScreen - yOld; FrameTest.this.setLocation(xx, yy); } }); } public void ShowImg() { if (imgIco.getIconWidth() > 695 || imgIco.getIconHeight() > 465) { width = 695; height = 675 * (float) imgIco.getIconHeight() / imgIco.getIconWidth(); // System.out.println((float)ii.getIconHeight()/ii.getIconWidth()); } else { width = imgIco.getIconWidth(); height = imgIco.getIconHeight(); } showii = new ImageIcon(imgIco.getImage().getScaledInstance((int) width, (int) height, 0)); this.jl.setText(""); this.jl.setIcon(showii); } public void Zoom(int flag) { //System.out.println(width + " " + flag); if ((width < 5000 && height < 4000) && (width > 5 && height > 4)) { if (flag == 0) { // 放大 width *= 1.3; height *= 1.3; } else if (flag == 1) { // 縮小 width *= 0.7; height *= 0.7; } this.jl.setIcon(null); showii = new ImageIcon(imgIco.getImage().getScaledInstance( (int) width, (int) height, 0)); //todo this.jl.setIcon(showii); } else if (width > 5000 || height > 4000) { width *= 0.8; height *= 0.8; JOptionPane.showMessageDialog(this, "再放大會失真"); } else if (width < 5 || height < 3) { width *= 1.2; height *= 1.2; JOptionPane.showMessageDialog(this, "再縮小就看不見"); } } public void Save() { // 彈出檔案選擇框 JFileChooser chooser = new JFileChooser(); // 下面的方法將阻塞，直到【使用者按下儲存按鈕且“檔名”文字框不為空】或【使用者按下取消按鈕】 int option = chooser.showSaveDialog(null); if (option == JFileChooser.APPROVE_OPTION) { // 假如使用者選擇了儲存 File file = chooser.getSelectedFile(); downUrlTxt("", "", file.getPath()); } } public void downUrlTxt(String fileName, String fileUrl, String downPath) { File savePath = new File(downPath); if (!savePath.exists()) { savePath.mkdir(); } String[] urlname = fileUrl.split("/"); int len = urlname.length - 1; String uname = urlname[len];// 獲取檔名 try { File file = new File(savePath + "/" + "x_" + uname);// 建立新檔案 if (file != null && !file.exists()) { file.createNewFile(); } OutputStream oputstream = new FileOutputStream(file); URL url = new URL(fileUrl); HttpURLConnection uc = (HttpURLConnection) url.openConnection(); uc.setDoInput(true);// 設定是否要從 URL 連線讀取資料,預設為true uc.connect(); InputStream iputstream = uc.getInputStream(); // System.out.println("file size is:"+uc.getContentLength());//列印檔案長度 byte[] buffer = new byte[4 * 1024]; int byteRead = -1; while ((byteRead = (iputstream.read(buffer))) != -1) { oputstream.write(buffer, 0, byteRead); } oputstream.flush(); iputstream.close(); oputstream.close(); } catch (Exception e) { System.out.println("讀取失敗！"); e.printStackTrace(); } } //imagUrl裡面有是個網址，然後這個網址裡面有張圖片 public ImageIcon getAvatar(final String barejid, final int size) { String imageUrl = ""; try { return new ImageIcon(new URL(imageUrl)); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return imgIco; } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == jb1) { Zoom(0); } else if (e.getSource() == jb2) { // 縮小 Zoom(1); } else if (e.getSource() == jb3) { // 儲存 Save(); } } // @Override public void mouseWheelMoved(MouseWheelEvent e) { // TODO Auto-generated method stub if (e.getWheelRotation() == 1) { Zoom(0); } else if (e.getWheelRotation() == -1) { Zoom(1); } } @Override public void mouseClicked(MouseEvent mouseevent) { // TODO Auto-generated method stub } @Override public void mouseEntered(MouseEvent mouseevent) { // TODO Auto-generated method stub } @Override public void mouseExited(MouseEvent mouseevent) { // TODO Auto-generated method stub } @Override public void mousePressed(MouseEvent mouseevent) { // TODO Auto-generated method stub } @Override public void mouseReleased(MouseEvent mouseevent) { // TODO Auto-generated method stub } }