文件的拆除和拼装

package TestStream;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/*找到一个大于100k的文件，按照100k为单位，拆分成多个子文件，并且以编号作为文件名结束。
        比如文件 eclipse.exe，大小是309k。
        拆分之后，成为
        eclipse.exe-0
        eclipse.exe-1
        eclipse.exe-2
        eclipse.exe-3*/
public class Test04 {
    static int j = 0;
    public static void main(String[] args) {
        try{
            File file = new File("D:Test.exe");
            FileInputStream fis = new FileInputStream(file);
            byte[] all = new byte[(int) file.length()];
            fis.read(all);
            System.out.println(all.length);
            fis.close();
            String fileName = "D:Test.exe-";
            String tmpFileName;
            for (int i = 0; i < 4; i++) {
                tmpFileName = fileName + Integer.toString(i);
                File file1 = new File(tmpFileName);
                file1.getParentFile().mkdirs();
                file1.createNewFile();
                FileOutputStream fos = new FileOutputStream(file1);
                for ( ; j < all.length; j++) {
                    fos.write(all[j]);
                    if( i < 3){
                        if((j+1) % 10000 == 0){
                            j++;
                            break; // break 后不会自动j++
                        }
                    }
                }
                fos.close();
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}

package TestStream;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Test05 {

    public static void main(String[] args) throws IOException {
        String fileName = "D:Test.exe-";
        String tmpName;
        File file = new File("E:ly.exe");
        file.getParentFile().mkdirs();
        file.createNewFile();
        FileOutputStream fileOutputStream = new FileOutputStream(file);
        for (int i = 0; i < 4; i++) {
            tmpName = fileName + Integer.toString(i);
            File file1 = new File(tmpName);
            FileInputStream fileInputStream = new FileInputStream(file1);
            byte[] bytes = new byte[(int) file1.length()];
            fileInputStream.read(bytes);
            fileInputStream.close();
            fileOutputStream.write(bytes);
        }
        fileOutputStream.close();
    }
}