JAVA写的MP3标签读写器-XjgMG4n-ChinaUnix博客

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JAVA写的MP3标签读写器

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2008-10-15 16:32:41

前几天写了一个NB的音乐插件，自己用了一下，还是挺方便的，后来想想，如果能把歌词也显示出来那就更好了。呵呵，怎么办呢，只有自己写了，在显示歌词之前，必须要知道目前正在播放的MP3是什么内容啊，一点可以从文件名得到一些信息，还有一点就是从MP3文件里面得到这个MP3的信息，我这里实现的ID3V1的格式标签，APEV2也想实现，无奈找不到相关的资料，不知道APEV2的数据结构是怎么样的，所以也无从分析。目前已经写完了ID3V1格式标签的读取和写入。并且NB的音乐插件也实现了本地歌词的搜索，先把ID3V1的文件结构的类文件帖一下，大家一起分享。

MP3的ID3V1的信息结构是很有规律的，它一般是出现在MP3文件的最后128个字节上，并且是以“TAG”开头。我这里把它封装成一个类了。

截图如下：

代码如下：

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.hadeslee.music;

/**
* 一个歌曲信息的类的结构表示
* 这个歌曲是使用ID3V1的信息结构的
* @author hadeslee
*/
public class SongInfo {

    private final String TAG = "TAG";//文件头1-3
    private String songName;//歌曲名4-33
    private String artist;//歌手名34-63
    private String album;//专辑名61-93
    private String year;//年94-97
    private String comment;//备注98-125
    private byte r1,  r2,  r3;//三个保留位126，127，128
    private boolean valid;//是否合法
    public transient String fileName;//此歌曲对应的文件名,没有封装
    public SongInfo(byte[] data) {
        if (data.length != 128) {
            throw new RuntimeException("数据长度不合法:" + data.length);
        }
        String tag = new String(data, 0, 3);
        //只有前三个字节是TAG才处理后面的字节
        if (tag.equalsIgnoreCase("TAG")) {
            valid = true;
            songName = new String(data, 3, 30).trim();
            artist = new String(data, 33, 30).trim();
            album = new String(data, 63, 30).trim();
            year = new String(data, 93, 4).trim();
            comment = new String(data, 97, 28).trim();
            r1 = data[125];
            r2 = data[126];
            r3 = data[127];
        } else {
            valid = false;
        }
    }

    public SongInfo() {
    }

    /**
     * 返回是否合法
     * @return 是否
     */
    public boolean isValid() {
        return valid;
    }

    /**
     * 得到此对象的128个字节的表示形式
     * @return
     */
    public byte[] getBytes() {
        byte[] data = new byte[128];
        System.arraycopy(TAG.getBytes(), 0, data, 0, 3);
        byte[] temp = songName.getBytes();
        System.arraycopy(temp, 0, data, 3, temp.length > 30 ? 30 : temp.length);
        temp = artist.getBytes();
        System.arraycopy(temp, 0, data, 33, temp.length > 30 ? 30 : temp.length);
        temp = album.getBytes();
        System.arraycopy(temp, 0, data, 63, temp.length > 30 ? 30 : temp.length);
        temp = year.getBytes();
        System.arraycopy(temp, 0, data, 93, temp.length > 4 ? 4 : temp.length);
        temp = comment.getBytes();
        System.arraycopy(temp, 0, data, 97, temp.length > 28 ? 28 : temp.length);
        data[125] = r1;
        data[126] = r2;
        data[127] = r3;
        return data;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String authorName) {
        this.artist = authorName;
    }

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public byte getR1() {
        return r1;
    }

    public void setR1(byte r1) {
        this.r1 = r1;
    }

    public byte getR2() {
        return r2;
    }

    public void setR2(byte r2) {
        this.r2 = r2;
    }

    public byte getR3() {
        return r3;
    }

    public void setR3(byte r3) {
        this.r3 = r3;
    }

    public String getSongName() {
        return songName;
    }

    public void setSongName(String songName) {
        if(songName==null){
            throw new NullPointerException("歌名不能是null!");
        }
        valid=true;
        this.songName = songName;
    }

    public String getAlbum() {
        return album;
    }

    public void setAlbum(String specialName) {
        this.album = specialName;
    }

    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }

}

编辑对话框的代码：

/*
* SongInfoDialog.java
*
* Created on 2007年11月26日, 下午4:12
*/
package com.hadeslee.music;

import java.awt.Dialog;
import java.awt.Frame;
import java.io.File;
import java.io.RandomAccessFile;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
*
* @author  hadeslee
*/
public class SongInfoDialog extends javax.swing.JDialog {

    private SongInfo info;//歌曲信息对象
    private File file;//文件对象
    private boolean valid;//表示原来这个文件是不是合法的,如果不是,就要重新写入128个字节
    /** Creates new form SongInfoDialog */
    public SongInfoDialog(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
    }

    public SongInfoDialog(Dialog parent, boolean modal) {
        super(parent, modal);
        initComponents();
    }

    public SongInfoDialog(Frame parent, boolean modal, File file) {
        this(parent, modal);
        this.file = file;
        init();
    }

    public SongInfoDialog(Dialog parent, boolean modal, File file) {
        this(parent, modal);
        this.file = file;
        init();
    }

    /**
     * 初始化
     */
    private void init() {
        try {
            fileName.setText(file.toString());
            RandomAccessFile ra = new RandomAccessFile(file, "r");
            byte[] buffer = new byte[128];
            ra.seek(ra.length() - 128);
            ra.read(buffer);
            info = new SongInfo(buffer);
            valid = info.isValid();
            title.setText(info.getSongName());
            artist.setText(info.getArtist());
            album.setText(info.getAlbum());
            year.setText(info.getYear());
            comment.setText(info.getComment());
            r2.setText("" + info.getR2());
            r3.setText("" + info.getR3());
            ra.close();
        } catch (Exception ex) {
            Logger.getLogger(SongInfoDialog.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    //
    private void initComponents() {

        jLabel5 = new javax.swing.JLabel();
        fileName = new javax.swing.JTextField();
        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        title = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        artist = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        album = new javax.swing.JTextField();
        jLabel6 = new javax.swing.JLabel();
        r2 = new javax.swing.JTextField();
        year = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        r3 = new javax.swing.JTextField();
        jLabel8 = new javax.swing.JLabel();
        jScrollPane1 = new javax.swing.JScrollPane();
        comment = new javax.swing.JTextArea();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jLabel9 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);

        jLabel5.setText("文件名:");

        fileName.setEditable(false);

        jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder("标签"));

        jLabel1.setText("标  题:");

        jLabel2.setText("艺术家:");

        jLabel3.setText("专  辑:");

        jLabel4.setText("年份:");

        jLabel6.setText("音轨:");

        r2.setEditable(false);

        jLabel7.setText("流  派:");

        r3.setEditable(false);

        jLabel8.setText("备  注:");

        comment.setColumns(20);
        comment.setRows(5);
        jScrollPane1.setViewportView(comment);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(title, javax.swing.GroupLayout.PREFERRED_SIZE, 183, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(artist, javax.swing.GroupLayout.DEFAULT_SIZE, 185, Short.MAX_VALUE)
                        .addContainerGap())
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel3)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(album, javax.swing.GroupLayout.DEFAULT_SIZE, 110, Short.MAX_VALUE))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel7)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(r3, javax.swing.GroupLayout.DEFAULT_SIZE, 110, Short.MAX_VALUE)))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel4)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(year, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jLabel6)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                .addComponent(r2, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addContainerGap())
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel8)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 185, Short.MAX_VALUE)
                        .addContainerGap())))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel1)
.addComponent(title, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(artist, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel3)
.addComponent(r2, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel6)
.addComponent(album, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(year, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel7)
.addComponent(r3, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(

jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel8)
                        .addContainerGap(42, Short.MAX_VALUE))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 57, Short.MAX_VALUE)))
        );

        jButton1.setText("重新读取文件");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("保存到文件");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("取消");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jLabel9.setForeground(new java.awt.Color(255, 0, 102));
        jLabel9.setText("注:目前只支持ID3v1格式标签的存取");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel5)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(fileName, javax.swing.GroupLayout.DEFAULT_SIZE, 221, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jButton1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton3))
                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jLabel9))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel5)
                    .addComponent(fileName, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE,

javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jLabel9)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }//
    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        this.dispose();
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        doSave();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
        init();
    }

    private void doSave() {
        try {
            info.setAlbum(album.getText());
            info.setArtist(artist.getText());
            info.setComment(comment.getText());
            info.setR1((byte) 0);
            try {
                info.setR2(Byte.parseByte(r2.getText()));
                info.setR3(Byte.parseByte(r3.getText()));
            } catch (Exception exe) {
                exe.printStackTrace();
            }
            info.setYear(year.getText());
            info.setSongName(title.getText());
            RandomAccessFile raf = new RandomAccessFile(file, "rw");
            //如果这个文件原来就是合法的,那么就不用新起128个字节了
            if (valid) {
                raf.seek(raf.length() - 128);
            } else {//否则就在末层加上128个字节
                raf.seek(raf.length());
            }
            raf.write(info.getBytes());
            raf.close();
            this.dispose();
        } catch (Exception ex) {
            Logger.getLogger(SongInfoDialog.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                SongInfoDialog dialog = new SongInfoDialog(new javax.swing.JFrame(), true);
                dialog.addWindowListener(new java.awt.event.WindowAdapter() {

                    public void windowClosing(java.awt.event.WindowEvent e) {
                        System.exit(0);
                    }
                });
                dialog.setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JTextField album;
    private javax.swing.JTextField artist;
    private javax.swing.JTextArea comment;
    private javax.swing.JTextField fileName;
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JLabel jLabel9;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextField r2;
    private javax.swing.JTextField r3;
    private javax.swing.JTextField title;
    private javax.swing.JTextField year;
    // End of variables declaration
}

【责编:Chuan】

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