用Java如何得到mp3的属性

发布网友发布时间：2022-04-30 06:42

共1个回答

热心网友时间：2023-10-19 22:30

package mp3;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;

public class ReadMp3 {
private SongInfo info = null;
private RandomAccessFile ran = null;
private File file = null;

public ReadMp3() throws FileNotFoundException {
file = new File("./rec/感觉不到你.mp3");
ran = new RandomAccessFile(file, "r");
System.out.println("文件装载完毕");

}

public static void main(String[] args) throws IOException {
ReadMp3 read = new ReadMp3();
byte[] buffer = new byte[128];

read.ran.seek(read.ran.length() - 128);

read.ran.read(buffer);
SongInfo info = new SongInfo(buffer);
System.out.println("name:" + info.getSongName() + " year:"
+ info.getYear() + " 歌手:" + info.getArtist() + " 专辑名:"
+ info.getAlbum() + " 备注:" + info.getComment());

}
}
package mp3;

/**
* 一个歌曲信息的类的结构表示这个歌曲是使用ID3V1的信息存储结构的
*
* @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;
}

}

参考资料：http://topic.csdn.net/u/20080316/19/ccd5b13c-102b-406e-8599-1368cd27c864.html?529127657

热心网友时间：2023-10-19 22:30

参考资料：http://topic.csdn.net/u/20080316/19/ccd5b13c-102b-406e-8599-1368cd27c864.html?529127657