Java实现文件分割和文件合并实例

import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.RandomAccessFile;import java.util.Scanner;public class Main { public static void main(String[] args) throws FileNotFoundException, IOException {  File sourceFile = new File("ping.mp3");//  System.out.println(sourceFile.exists());  Scanner scanner = new Scanner(System.in);  int numberOfPieces = 1;  //默认文件切割的数量  System.out.println("Enter:");  //提示输入  numberOfPieces = scanner.nextInt();  //输入  scanner.close();  //输入后就关闭 装完逼就跑一个道理  long fileLength = sourceFile.length() / numberOfPieces;  //分一下每一个小文件的大小  byte[] b = new byte[1024];  //这个不解释 如果看不懂 就去看IO流去吧  RandomAccessFile raf1 = new RandomAccessFile(sourceFile, "r");    int len = -1;  for(int i = 0; i < numberOfPieces; i++) {   String name = sourceFile.getName() + "." + (i+1);   File file = new File(name);   file.createNewFile();   RandomAccessFile raf2 = new RandomAccessFile(file, "rw");   while((len = raf1.read(b)) != -1) {    raf2.write(b, 0, len);  //我觉的这样写比raf2.write(b);高明一些    if(raf2.length() > fileLength)  //如果太大了就不在这个子文件写了 换下一个     break;   }   raf2.close();  }  raf1.close(); }}

import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.RandomAccessFile;//文件合并 ping.npublic class Main { public static void main(String[] args) throws FileNotFoundException, IOException {  File[] files = new File[10];  String name = "ping.";  File file = new File("ping.mp3");  file.createNewFile();  RandomAccessFile in = new RandomAccessFile(file, "rw");  in.setLength(0);  in.seek(0);  byte[] bytes = new byte[1024];  int len = -1;  for(int i = 0; i < files.length; i++) {   files[i] = new File(name + (i + 1));   //System.out.println(files[i].exists());   RandomAccessFile out = new RandomAccessFile(files[i], "rw");   while((len = out.read(bytes)) != -1) {    in.write(bytes, 0, len);   }   out.close();  }  in.close(); }}