JPanel没有显示在JFrame中吗? [英] JPanel not showing in JFrame?
本文介绍了JPanel没有显示在JFrame中吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用JAudioTagger在Java中创建mp3Tagger应用程序 http://www.jthink.net/jaudiotagger / 该应用程序实际显示曲目的标题，编号，专辑，艺术家，年份，类型和元数据中包含的注释. 它应该在主JFrame角落的JPanel上显示专辑的插图...但事实并非如此. 我认为Jpanel不起作用:它既不显示JTextField也不显示Button. 代码:
I'm creating a mp3Tagger app in Java, using JAudioTagger http://www.jthink.net/jaudiotagger/ The app actually shows the title of the track, the number, the album, the artist, the year, the genre and the comments included in the Metadatas. It should show the artwork of the album on a JPanel in a corner of the main JFrame... But it doesn't. I think that the Jpanel doesn't work: it doesn't show neither JTextField or Button... The code:
class JPanelArt extends JComponent {
private static final long serialVersionUID = 1L;
private Image image;
public JPanelArt() {
try {
image = ImageIO.read(new File("res/download.jpg"));
} catch (IOException e) {}
}
protected void paintComponent(Graphics g) {
if (image == null)
return;
g.drawImage(image, 0, 0, null);
}
}
框架类:
public class Mp3TaggerFrame extends JFrame {
private static final long serialVersionUID = 1L;
static AudioFile mp3;
private JPanel contentPane;
private JPanelArt albumArt;
private JLabel imageArt;
private JTextField titleTrack;
private JTextField artist;
private JTextField album;
private JTextField genre;
private JTextField trackNumber;
private JTextField lenght;
private JTextField year;
private JTextField comment;
private JTextField bitRate;
JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("Mp3 File",
"mp3");
public void setAlbumArt(BufferedImage _image) {
}
public String getTitleTrack() {
return titleTrack.getText();
}
public void setTitleTrack(String title) {
this.titleTrack.setText(title);
}
public String getArtist() {
return artist.getText();
}
public void setArtist(String artist) {
this.artist.setText(artist);
}
public String getAlbum() {
return album.getText();
}
public void setAlbum(String album) {
this.album.setText(album);
}
public String getGenre() {
return genre.getText();
}
public void setGenre(String genre) {
this.genre.setText(genre);
}
public int getTrackNumber() {
return Integer.valueOf(trackNumber.getText());
}
public void setTrackNumber(String string) {
this.trackNumber.setText(string);
}
public void setLenght(int lenght) {
int min = 0;
int sec = lenght;
while (sec >= 60) {
sec = sec - 60;
min++;
}
this.lenght.setText(String.valueOf(min) + ":" + String.valueOf(sec));
}
public int getYear() {
return Integer.valueOf(year.getText());
}
public void setYear(String year) {
this.year.setText(year);
}
public String getComment() {
return comment.getText();
}
public void setComment(String comment) {
this.comment.setText(comment);
}
public String getBitRate() {
return bitRate.getText();
}
public void setBitRate(String bitRate) {
this.bitRate.setText(bitRate);
}
/**
* Create the frame.
*/
public Mp3TaggerFrame() {
try {
UIManager.setLookAndFeel(new SyntheticaBlackStarLookAndFeel());
} catch (Exception e) {
}
chooser.setFileFilter(filter);
setFont(new Font("Century Schoolbook", Font.PLAIN, 14));
setResizable(false);
setTitle("Mp3Tagger");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 562, 423);
setIconImage(new ImageIcon("res/Icon.png").getImage());
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
JMenuItem openMp3File = new JMenuItem("Open Mp3 File");
mnFile.add(openMp3File);
openMp3File.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
openFile();
}
});
JMenuItem saveWithNewTag = new JMenuItem("Save With New Tag");
mnFile.add(saveWithNewTag);
saveWithNewTag.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
saveFile();
}
});
JMenuItem mntmExit = new JMenuItem("Exit");
mnFile.add(mntmExit);
JMenu mnAbout = new JMenu("About");
menuBar.add(mnAbout);
JMenuItem mntmAboutTheProgram = new JMenuItem("About The Program");
mnAbout.add(mntmAboutTheProgram);
JMenuItem mntmContacts = new JMenuItem("Contacts");
mnAbout.add(mntmContacts);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblTitle = new JLabel("Title:");
lblTitle.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblTitle.setBounds(6, 6, 122, 28);
contentPane.add(lblTitle);
titleTrack = new JTextField();
titleTrack.setToolTipText("Title Of The Track");
titleTrack.setBounds(6, 32, 122, 28);
contentPane.add(titleTrack);
titleTrack.setColumns(10);
JLabel lblArtist = new JLabel("Artist:");
lblArtist.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblArtist.setBounds(6, 72, 122, 28);
contentPane.add(lblArtist);
artist = new JTextField();
artist.setToolTipText("Artist");
artist.setColumns(10);
artist.setBounds(6, 98, 122, 28);
contentPane.add(artist);
JLabel lblAlbum = new JLabel("Album:");
lblAlbum.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblAlbum.setBounds(6, 138, 122, 28);
contentPane.add(lblAlbum);
album = new JTextField();
album.setToolTipText("Album");
album.setColumns(10);
album.setBounds(6, 164, 122, 28);
contentPane.add(album);
JLabel lblGenre = new JLabel("Genre:");
lblGenre.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblGenre.setBounds(6, 270, 122, 28);
contentPane.add(lblGenre);
genre = new JTextField();
genre.setToolTipText("Genre Of The Track");
genre.setColumns(10);
genre.setBounds(6, 296, 122, 28);
contentPane.add(genre);
JLabel lblTrackNumber = new JLabel("Track Number:");
lblTrackNumber.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblTrackNumber.setBounds(6, 204, 122, 28);
contentPane.add(lblTrackNumber);
trackNumber = new JTextField();
trackNumber.setToolTipText("Number of the track in the album");
trackNumber.setColumns(10);
trackNumber.setBounds(6, 230, 122, 28);
contentPane.add(trackNumber);
JLabel lblAlbumArt = new JLabel("Album Art");
lblAlbumArt.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblAlbumArt.setBounds(375, 6, 73, 28);
contentPane.add(lblAlbumArt);
albumArt = new JPanelArt();
albumArt.setToolTipText("The Album Cover");
albumArt.setBounds(375, 192, 150, -150);
contentPane.add(albumArt);
JLabel lblLenght = new JLabel("Lenght");
lblLenght.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblLenght.setBounds(375, 204, 122, 28);
contentPane.add(lblLenght);
lenght = new JTextField();
lenght.setEditable(false);
lenght.setToolTipText("Lenght of the song");
lenght.setColumns(10);
lenght.setBounds(375, 230, 122, 28);
contentPane.add(lenght);
JButton editAlbumArt = new JButton("Edit");
editAlbumArt.setBounds(460, 6, 55, 28);
contentPane.add(editAlbumArt);
JLabel lblYear = new JLabel("Year:");
lblYear.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblYear.setBounds(181, 6, 122, 28);
contentPane.add(lblYear);
year = new JTextField();
year.setToolTipText("Year Of The Track");
year.setColumns(10);
year.setBounds(181, 32, 122, 28);
contentPane.add(year);
JLabel lblComments = new JLabel("Comments:");
lblComments.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblComments.setBounds(181, 72, 122, 28);
contentPane.add(lblComments);
comment = new JTextField();
comment.setToolTipText("Comments Of The Track");
comment.setColumns(10);
comment.setBounds(181, 98, 122, 160);
contentPane.add(comment);
JLabel lblBitrate = new JLabel("Bit Rate");
lblBitrate.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblBitrate.setBounds(375, 270, 122, 28);
contentPane.add(lblBitrate);
bitRate = new JTextField();
bitRate.setToolTipText("BitRate of the song");
bitRate.setEditable(false);
bitRate.setColumns(10);
bitRate.setBounds(375, 296, 122, 28);
contentPane.add(bitRate);
}
private void openFile() {
if (chooser.showOpenDialog(chooser) == JFileChooser.APPROVE_OPTION) {
try {
mp3 = AudioFileIO.read((new File(chooser.getSelectedFile()
.getAbsolutePath())));
} catch (CannotReadException | IOException | TagException
| ReadOnlyFileException | InvalidAudioFrameException e) {
e.printStackTrace();
}
} else
System.out.println("Nessun File Selezionato");
setTextFields();
}
private void setTextFields() {
Tag tag = mp3.getTag();
AudioHeader ah = mp3.getAudioHeader();
setTitleTrack(tag.getFirst(FieldKey.TITLE));
setAlbum(tag.getFirst(FieldKey.ALBUM));
setArtist(tag.getFirst(FieldKey.ARTIST));
setGenre(tag.getFirst(FieldKey.GENRE));
setTrackNumber(tag.getFirst(FieldKey.TRACK));
setLenght(ah.getTrackLength());
setYear(tag.getFirst(FieldKey.YEAR));
setComment(tag.getFirst(FieldKey.COMMENT));
setBitRate(ah.getBitRate() + "Kbs");
try {
setAlbumArt((BufferedImage) tag.getFirstArtwork().getImage());
} catch (IOException e) {
e.printStackTrace();
}
}
private void saveFile() {
}
}
推荐答案
您如何显示它?我仍然看不到面板.
How do you make it shows? I'm still unable to see the Panel..
我做了一些更改，但是在(开始)制作MCVE的过程中，我得到了这段代码来制作上面的图像.
I made some changes, but in the course of (beginning) to make an MCVE, I got this code to make the image above.
import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.filechooser.FileNameExtensionFilter;
public class Mp3TaggerFrame extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JPanel albumArt;
private JLabel imageArt;
private JTextField titleTrack;
private JTextField artist;
private JTextField album;
private JTextField genre;
private JTextField trackNumber;
private JTextField lenght;
private JTextField year;
private JTextField comment;
private JTextField bitRate;
public static void main(String[] args) {
new Mp3TaggerFrame().setVisible(true);
}
JFileChooser chooser = new JFileChooser();
FileNameExtensionFilter filter = new FileNameExtensionFilter("Mp3 File",
"mp3");
public void setAlbumArt(BufferedImage _image) {
}
public String getTitleTrack() {
return titleTrack.getText();
}
public void setTitleTrack(String title) {
this.titleTrack.setText(title);
}
public String getArtist() {
return artist.getText();
}
public void setArtist(String artist) {
this.artist.setText(artist);
}
public String getAlbum() {
return album.getText();
}
public void setAlbum(String album) {
this.album.setText(album);
}
public String getGenre() {
return genre.getText();
}
public void setGenre(String genre) {
this.genre.setText(genre);
}
public int getTrackNumber() {
return Integer.valueOf(trackNumber.getText());
}
public void setTrackNumber(String string) {
this.trackNumber.setText(string);
}
public void setLenght(int lenght) {
int min = 0;
int sec = lenght;
while (sec >= 60) {
sec = sec - 60;
min++;
}
this.lenght.setText(String.valueOf(min) + ":" + String.valueOf(sec));
}
public int getYear() {
return Integer.valueOf(year.getText());
}
public void setYear(String year) {
this.year.setText(year);
}
public String getComment() {
return comment.getText();
}
public void setComment(String comment) {
this.comment.setText(comment);
}
public String getBitRate() {
return bitRate.getText();
}
public void setBitRate(String bitRate) {
this.bitRate.setText(bitRate);
}
/**
* Create the frame.
*/
public Mp3TaggerFrame() {
chooser.setFileFilter(filter);
setFont(new Font("Century Schoolbook", Font.PLAIN, 14));
setResizable(false);
setTitle("Mp3Tagger");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 562, 423);
setIconImage(new ImageIcon("res/Icon.png").getImage());
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);
JMenu mnFile = new JMenu("File");
menuBar.add(mnFile);
JMenuItem openMp3File = new JMenuItem("Open Mp3 File");
mnFile.add(openMp3File);
openMp3File.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
openFile();
}
});
JMenuItem saveWithNewTag = new JMenuItem("Save With New Tag");
mnFile.add(saveWithNewTag);
saveWithNewTag.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
saveFile();
}
});
JMenuItem mntmExit = new JMenuItem("Exit");
mnFile.add(mntmExit);
JMenu mnAbout = new JMenu("About");
menuBar.add(mnAbout);
JMenuItem mntmAboutTheProgram = new JMenuItem("About The Program");
mnAbout.add(mntmAboutTheProgram);
JMenuItem mntmContacts = new JMenuItem("Contacts");
mnAbout.add(mntmContacts);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblTitle = new JLabel("Title:");
lblTitle.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblTitle.setBounds(6, 6, 122, 28);
contentPane.add(lblTitle);
titleTrack = new JTextField();
titleTrack.setToolTipText("Title Of The Track");
titleTrack.setBounds(6, 32, 122, 28);
contentPane.add(titleTrack);
titleTrack.setColumns(10);
JLabel lblArtist = new JLabel("Artist:");
lblArtist.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblArtist.setBounds(6, 72, 122, 28);
contentPane.add(lblArtist);
artist = new JTextField();
artist.setToolTipText("Artist");
artist.setColumns(10);
artist.setBounds(6, 98, 122, 28);
contentPane.add(artist);
JLabel lblAlbum = new JLabel("Album:");
lblAlbum.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblAlbum.setBounds(6, 138, 122, 28);
contentPane.add(lblAlbum);
album = new JTextField();
album.setToolTipText("Album");
album.setColumns(10);
album.setBounds(6, 164, 122, 28);
contentPane.add(album);
JLabel lblGenre = new JLabel("Genre:");
lblGenre.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblGenre.setBounds(6, 270, 122, 28);
contentPane.add(lblGenre);
genre = new JTextField();
genre.setToolTipText("Genre Of The Track");
genre.setColumns(10);
genre.setBounds(6, 296, 122, 28);
contentPane.add(genre);
JLabel lblTrackNumber = new JLabel("Track Number:");
lblTrackNumber.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblTrackNumber.setBounds(6, 204, 122, 28);
contentPane.add(lblTrackNumber);
trackNumber = new JTextField();
trackNumber.setToolTipText("Number of the track in the album");
trackNumber.setColumns(10);
trackNumber.setBounds(6, 230, 122, 28);
contentPane.add(trackNumber);
JLabel lblAlbumArt = new JLabel("Album Art");
lblAlbumArt.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblAlbumArt.setBounds(375, 6, 73, 28);
contentPane.add(lblAlbumArt);
albumArt = new JPanel();
BufferedImage bi = new BufferedImage(150,150,BufferedImage.TYPE_INT_RGB);
albumArt.add(new JLabel(new ImageIcon(bi)));
albumArt.setToolTipText("The Album Cover");
albumArt.setBounds(375, 42, 150, 150);
contentPane.add(albumArt);
JLabel lblLenght = new JLabel("Lenght");
lblLenght.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblLenght.setBounds(375, 204, 122, 28);
contentPane.add(lblLenght);
lenght = new JTextField();
lenght.setEditable(false);
lenght.setToolTipText("Lenght of the song");
lenght.setColumns(10);
lenght.setBounds(375, 230, 122, 28);
contentPane.add(lenght);
JButton editAlbumArt = new JButton("Edit");
editAlbumArt.setBounds(460, 6, 55, 28);
contentPane.add(editAlbumArt);
JLabel lblYear = new JLabel("Year:");
lblYear.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblYear.setBounds(181, 6, 122, 28);
contentPane.add(lblYear);
year = new JTextField();
year.setToolTipText("Year Of The Track");
year.setColumns(10);
year.setBounds(181, 32, 122, 28);
contentPane.add(year);
JLabel lblComments = new JLabel("Comments:");
lblComments.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblComments.setBounds(181, 72, 122, 28);
contentPane.add(lblComments);
comment = new JTextField();
comment.setToolTipText("Comments Of The Track");
comment.setColumns(10);
comment.setBounds(181, 98, 122, 160);
contentPane.add(comment);
JLabel lblBitrate = new JLabel("Bit Rate");
lblBitrate.setFont(new Font("DokChampa", Font.PLAIN, 15));
lblBitrate.setBounds(375, 270, 122, 28);
contentPane.add(lblBitrate);
bitRate = new JTextField();
bitRate.setToolTipText("BitRate of the song");
bitRate.setEditable(false);
bitRate.setColumns(10);
bitRate.setBounds(375, 296, 122, 28);
contentPane.add(bitRate);
}
private void openFile() {
}
private void setTextFields() {
}
private void saveFile() {
}
}
这篇关于JPanel没有显示在JFrame中吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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