java-SequenceInputStream，切割、…

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import java.util.*;
import java.io.*;
class CombFileDemo { public static void main(String[] args) throws IOException { //combFile_Vector(); String path = "splitFile\\"; String ansName = "Adele-Someone Like You.mp3"; String ansFilter = ".spl";

splitFile(path, ansName, ".spl");

String tagName = "Adele-Someone Like You(comb).mp3"; int splitCnt = 5;

combFile_ArrayList(path, tagName, ansFilter, splitCnt); }

public static void combFile_Vector() throws IOException { FileInputStream fis1 = new FileInputStream("1.txt"); FileInputStream fis2 = new FileInputStream("2.txt"); FileInputStream fis3 = new FileInputStream("3.txt");

//用Vector是因为它有一个方法可以直接返回枚举类型.elements(),但是效率低. Vector<FileInputStream> v = new Vector<FileInputStream>();

v.add(fis1); v.add(fis2); v.add(fis3); Enumeration <FileInputStream> er = v.elements(); SequenceInputStream sis = new SequenceInputStream(er); //构造函数结构枚举类型的参数.

FileOutputStream fos = new FileOutputStream("123.txt"); byte [] buf = new byte[1024]; int num = 0; while((num = sis.read(buf)) != -1) { fos.write(buf, 0, num); } sis.close(); //关掉关联的三个流. fos.close(); }

public static void combFile_ArrayList(String path, String tagName, String ansFilter, int cnt) throws IOException { ArrayList<FileInputStream> al = new ArrayList<FileInputStream>(); for (int x = 1; x <=cnt; x++) { al.add(new FileInputStream(path + x+ansFilter)); //在合并的文件名有规律的情况下. }

final Iterator <FileInputStream> it = al.iterator();

//自定义一个枚举类型 Enumeration <FileInputStream> er = new Enumeration <FileInputStream> () { public boolean hasMoreElements() { return it.hasNext(); } public FileInputStream nextElement() { return it.next(); } };

SequenceInputStream sis = new SequenceInputStream(er); //构造函数结构枚举类型的参数. FileOutputStream fos = new FileOutputStream(path + tagName); byte [] buf = new byte[1024]; int num = 0; while((num = sis.read(buf)) != -1) { fos.write(buf, 0, num); } sis.close(); //关掉关联的三个流. fos.close(); }

//切割文件 public static void splitFile(String path, String fileName, String filter) throws IOException { FileInputStream fis = new FileInputStream(path + fileName);

byte[] b = new byte[1024*1024]; //按照1M的大小进行切割. FileOutputStream fos = null; int num = 0; int len = 0; while ((len = fis.read(b)) != -1) { fos = new FileOutputStream(path + (++num)+filter); fos.write(b, 0, len); fos.close(); } fis.close(); } }

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