RandomAccessFile拆分合并文件

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.io.SequenceInputStream;

import java.util.Vector;

public class RandonFileAccessTest {

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

        splitFile("test.txt");

        mergeFile();

        mergeFile2();

    }

    //拆分文件

    public static void splitFile(String path) throws IOException{

        InputStream is = new FileInputStream(path);

        int len=0;

        byte[] buff = new byte[1024];

        int i = 1;

        while((len=is.read(buff))!=-1){

            RandomAccessFile raf = new RandomAccessFile("raf"+i+".txt", "rw");//raf1.txt raf2.txt 一共只有两个文件

            raf.write(buff,0,len);

            raf.close();

            i++;

        }

        is.close();

    }

    
　　//合并文件

    public static void mergeFile() throws IOException{

        RandomAccessFile raf = new RandomAccessFile("raf3.txt", "rw");

        InputStream is = null;

        for(int i=1;i<3;i++){

            int len=0;

            is = new FileInputStream("raf"+i+".txt"); //一共就两个文件

            byte[] buff = new byte[1024];

            while((len=is.read(buff))!=-1){

                raf.write(buff,0,len);

            }

        }

        is.close();

        raf.close();

    }

    
　　//另一种方式的合并文件

    public static void mergeFile2() throws IOException{

        RandomAccessFile raf = new RandomAccessFile("raf4.txt", "rw");

        InputStream is = null;

        Vector<InputStream> vt = new Vector<InputStream>();

        for(int i=1;i<3;i++){

            is = new FileInputStream("raf"+i+".txt");//raf1.txt raf2.txt

            vt.addElement(is);

        }

        SequenceInputStream sis = new SequenceInputStream(vt.elements());

        int len=0;

        byte[] buff = new byte[1024];

        while((len=sis.read(buff))!=-1){

            raf.write(buff,0,len);

        }

        sis.close();

        is.close();

        raf.close();

    }

}