以任意字节切割mp3歌之后再拼接成完整的
- 案例1:
-
- 方法1
- 方法2
- 案例2
-
- 将多首歌拼接成一首大合唱,优化代码
对一首歌或者多首歌按照1Mb进行切割保存,然后再将切割后的碎片拼接成一首的完整的歌,可以拼接多首歌.来个几十兆的大合唱.
案例1:
对一首歌按照1Mb进行切割保存,然后再将切割后的碎片拼接成一首的完整的歌
将g:\夜夜夜夜.mp3
切开存储g:\apartFile文件夹中
再访问文件夹拼接完整.
方法1
用随机访问流RandomAccessFile,可以控制文件指针
顺序流SequenceInputStream 拼接,可以传一个Enumeration迭代器
package com.westos.afternoon;
import java.io.*;
import java.util.Enumeration;
import java.util.Vector;
public class Demo5 {
public static void main(String[] args) throws IOException {
//用随机访问流,可以控制文件指针
RandomAccessFile in = new RandomAccessFile(new File("g:\\夜夜夜夜.mp3"), "rw");
byte[] bytes = new byte[1024];
takeApart(in, bytes);//拆分
mergingMusic(bytes);//合并
}
private static void takeApart(RandomAccessFile in, byte[] bytes) throws IOException {
//我的这首歌是4.6兆左右,按照一兆一切可以切5份
File file = new File("g:\\apartFile");
if(!file.exists()){
file.mkdirs();
}
for (int i = 1; i < 6; i++) {
//切开生成5个
FileOutputStream out = new FileOutputStream("g:\\apartFile\\apart" + i + ".mp3");
int len = 0;
while (in.getFilePointer() < 1024*1024 * (i) && (len = in.read(bytes)) != -1) {
out.write(bytes, 0, len);
out.flush();
//System.out.println(in.getFilePointer());
}
}
}
private static void mergingMusic(byte[] bytes) throws IOException {
Vector<FileInputStream> vector = new Vector<>();
File file = new File("g:\\apartFile");
File[] files = file.listFiles();
for (File f : files) {
vector.add(new FileInputStream(f));
}
Enumeration<FileInputStream> elements = vector.elements();
//顺序流SequenceInputStream可以传一个Enumeration迭代器
SequenceInputStream sq = new SequenceInputStream(elements);
FileOutputStream copy = new FileOutputStream("g:\\apartFile\\夜夜夜夜.mp3",true);
int len = 0;
byte[] bytes1 = new byte[1024];
while ((len = sq.read(bytes)) != -1) {
copy.write(bytes, 0, len);
}
copy.close();
sq.close();
}
}
方法2
用字节缓冲区,一次缓冲1Mb存1Mb
package org.westos.demo2;
import java.io.*;
import java.util.Vector;
/**
* @Author: Administrator
* @CreateTime: 2019-01-18 15:17
* @Description todo
*/
public class MyTest5 {
public static void main(String[] args) throws IOException {
chaifen(); //拆分文件
hebing();//合并文件
}
private static void hebing() throws IOException {
File file1 = new File("g:\\music");
File[] files = file1.listFiles();
Vector<FileInputStream> v = new Vector<>();
for (File f : files) {
if (f.isFile() && f.getName().endsWith(".mp3")) {
FileInputStream in = new FileInputStream(f);
v.add(in);
}
}
SequenceInputStream sin = new SequenceInputStream(v.elements());
byte[] bytes = new byte[1024 * 1024];
int len = 0;
FileOutputStream out = new FileOutputStream("g:\\music\\夜夜夜夜-齐秦.mp3");
while ((len = sin.read(bytes)) != -1) {
out.write(bytes, 0, len);
out.flush();
}
sin.close();
out.close();
}
private static void chaifen() throws IOException {
File file = new File("夜夜夜夜.mp3");
//2.封装一个文件夹
File file1 = new File("g:\\music");
if (!file1.exists()) {
file1.mkdirs();
}
FileInputStream in = new FileInputStream(file);
//拆分文件
byte[] bytes = new byte[1024 * 1024];//一次取出1Mb,存1Mb
int len = 0;
int i = 1;
while ((len = in.read(bytes)) != -1) {
FileOutputStream out = new FileOutputStream(new File(file1, (i++) + ".mp3"));
out.write(bytes, 0, len);
out.close();
}
in.close();
}
}
案例2
将多个音乐切割并拼接成一首歌
例如以下三首:
g:\情书.mp3
g:\夜夜夜夜.mp3
g:\怎样.mp3
拼接成g:\Copy.mp3
将多首歌拼接成一首大合唱,优化代码
package com.westos.afternoon;
import java.io.*;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Vector;
public class Demo5 {
public static void main(String[] args) throws IOException {
//用随机访问流,可以控制文件指针
//常见要合并的歌曲,以下三首
RandomAccessFile in = new RandomAccessFile(new File("g:\\情书.mp3"), "rw");
RandomAccessFile in1 = new RandomAccessFile(new File("g:\\夜夜夜夜.mp3"), "rw");
RandomAccessFile in2 = new RandomAccessFile(new File("g:\\怎样.mp3"), "rw");
ArrayList<RandomAccessFile> list = new ArrayList<>();
list.add(in);
list.add(in1);
list.add(in2);
for (RandomAccessFile randomAccessFile : list) {
takeApart(randomAccessFile);//拆分成10份,每次循环覆盖
mergingMusic();//合并这10分
}
}
private static void takeApart(RandomAccessFile in) throws IOException {
//我的这首歌是4.6兆左右,按照一兆一切可以切5份,但是我考虑到有的歌大于5兆,就分成10份,相当于可以存10兆之内的歌
File file = new File("g:\\apartFile");
if(!file.exists()){
file.mkdirs();
}
for (int i = 1; i < 11; i++) {
//切开生成5个
FileOutputStream out = new FileOutputStream("g:\\apartFile\\apart" + i + ".mp3");
int len = 0;
byte[] bytes = new byte[1024];
while (in.getFilePointer() < 1024*1024 * (i) && (len = in.read(bytes)) != -1) {
out.write(bytes, 0, len);
out.flush();
//System.out.println(in.getFilePointer());
}
out.close();
}
}
private static void mergingMusic() throws IOException {
Vector<FileInputStream> vector = new Vector<>();
File file = new File("g:\\apartFile");
File[] files = file.listFiles();
for (File f : files) {
if(f.isFile()&&f.getName().substring(0, 5).equals("apart")){
vector.add(new FileInputStream(f));
}
}
Enumeration<FileInputStream> elements = vector.elements();
//顺序流SequenceInputStream可以传一个Enumeration迭代器
SequenceInputStream sq = new SequenceInputStream(elements);
FileOutputStream copy = new FileOutputStream("g:\\Copy.mp3",true);
int len = 0;
byte[] bytes = new byte[1024];
while ((len = sq.read(bytes)) != -1) {
copy.write(bytes, 0, len);
}
copy.close();
sq.close();
}
}
结果:
将一首歌切成10块,每块最大1024kb,每次循环覆盖原有的
Copy.mp3就是最后结果,将3首歌拼接在了一起.
谢谢