package com.dhb.file;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.SequenceInputStream;

 import java.util.ArrayList;

 import java.util.Enumeration;

 import java.util.Vector;

 /**

  * @author DSHORE / 2018-7-13

  *

  */

 /*

  * SequenceInputStream()：序列流

  * */

 public class Demo21 {

     public static void main(String[] args) throws IOException {

         meger1();//字节流

         meger2();//序列流

         meger3();//序列流

     }

     //方式3：（序列流）把三个文件合成一个文件

     public static void meger3() throws IOException{

         //找到目标文件

         File file1 = new File("F:\\a.txt");

         File file2 = new File("F:\\b.txt");

         File file3 = new File("F:\\c.txt");

         File file4 = new File("F:\\d.txt");

         //建立数据输入输出通道

         FileOutputStream fos = new FileOutputStream(file4);

         FileInputStream fis1 = new FileInputStream(file1);

         FileInputStream fis2 = new FileInputStream(file2);

         FileInputStream fis3 = new FileInputStream(file3);

         //建立序列流

         Vector<FileInputStream> vector = new Vector<FileInputStream>();

         vector.add(fis1);

         vector.add(fis2);

         vector.add(fis3);

         Enumeration<FileInputStream> e = vector.elements();

         SequenceInputStream sequenceInputStream = new SequenceInputStream(e);

         //读取文件

         byte[] buf = new byte[];

         int length = ;

         while((length = sequenceInputStream.read(buf)) != -){

             fos.write(buf, , length);

         }

         //关闭资源

         sequenceInputStream.close();

         fos.close();

     }

     //方式2：（序列流） 需求：使用SequenceInputStream序列流合并a.txt与b.txt文件的内容

     public static void meger2() throws IOException{

         //找到目标文件

         File file1 = new File("F:\\a.txt");

         File file2 = new File("F:\\b.txt");

         File file3 = new File("F:\\c.txt");

         //建立数据输入输出通道

         FileOutputStream fos = new FileOutputStream(file3);

         FileInputStream fis = new FileInputStream(file1);

         FileInputStream fis1 = new FileInputStream(file2);

         //建立我们的序列流对象

         SequenceInputStream sis = new SequenceInputStream(fis, fis1);

         byte[] buf = new byte[];

         int length = ;

         while((length = sis.read(buf)) != -){

             fos.write(buf, , length);

         }

         //关闭资源

         sis.close();

         fos.close();

     }

     //方式1：（字节流） 需求:把a.txt与b.txt文件内容合并.

     public static void meger1() throws IOException{

         //找到目标文件

         File file1=new File("F:\\a.txt");

         File file2=new File("F:\\b.txt");

         File file3=new File("F:\\c.txt");

         //建立数据输入输出通道

         FileOutputStream fos=new FileOutputStream(file3);

         FileInputStream fis=new FileInputStream(file1);

         FileInputStream fis1=new FileInputStream(file2);

         //把输入流存储到集合中,然后在从集合中读取

         ArrayList<FileInputStream> list=new ArrayList<FileInputStream>();

         list.add(fis);

         list.add(fis1);

         //准备一个数组

         byte[] buf=new byte[];

         int length=;

         for (int i = ; i < list.size(); i++) {

             FileInputStream fileInputStream=list.get(i);

             while((length=fileInputStream.read(buf))!=-){

                 fos.write(buf, , length);

             }

             //关闭资源

             fileInputStream.close();

         }

         fos.close();

     }

 }

 package com.dhb.file;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.SequenceInputStream;

 import java.util.Enumeration;

 import java.util.Vector;

 /**

  * @author DSHORE / 2018-7-16

  *

  */

 //需求：mp3音乐的切割与合并

 public class Demo22 {

     public static void main(String[] args) throws IOException {

         cutFile();

         //mergeFile();

     }

     //合并mp3

     public static void mergeFile() throws IOException{

         //找到目标文件

         File dir = new File("E:\\MyMusic");

         //通过目标文件找到所有mp3,然后把这些mp3添加到vector集合中

         Vector<FileInputStream> vector = new Vector<FileInputStream>();

         File[] file = dir.listFiles();

         for (File file2 : file) {

             if(file2.getName().endsWith(".mp3")){//获取以.mp3结尾的文件名

                 vector.add(new FileInputStream(file2));//添加到vector集合中

             }

         }

         Enumeration<FileInputStream> e = vector.elements();//返回此向量组件的枚举。即把上面集合中的元素给了e对象

         SequenceInputStream sis = new SequenceInputStream(e);//建立序列流对象

         //建立缓冲数组读取文件

         byte[] buf = new byte[];

         int length = ;

         FileOutputStream fos = new FileOutputStream(new File("MyMusic\\MergeMusic\\合并音乐-忘尘谷.mp3"));//建立输出字节流

         while((length = sis.read(buf)) != -){//读

             fos.write(buf, , length);//写

         }

         fos.close();

         sis.close();

     }

     //切割mp3

     public static void cutFile() throws IOException{

         File file = new File("E:\\Music\\忘尘谷.mp3");

         //目标文件夹

         File dir = new File("E:\\MyMusic");

         //建立数据输入通道

         FileInputStream fis = new FileInputStream(file);

         //建立缓冲数组

         byte[] buf = new byte[*];//1024*1024 = 1MB，即：把该音乐切割成每份1MB的大小

         int length = ;
　　　　　　 //边读边写

         for (int i = ; (length=fis.read(buf)) != -; i++) {//读 (每次读1MB)

             FileOutputStream fos = new FileOutputStream(new File(dir,"wcg"+i+".mp3"));//建立数据输出通道

             fos.write(buf, , length);//写

             fos.close();

         }

         fis.close();

     }

 }