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


public class CutDemo {
 public static void main(String[] args) {
  //調(diào)用cutFile()函數(shù) 傳人參數(shù)分別為 （原大文件，切割后存放的小文件的路徑，切割規(guī)定的內(nèi)存大?。?
  cutFile("D:\\java\\cut\\ForrestGump.avi", "D:\\java\\cuts",1024 * 1024 * 20);
 }

 private static void cutFile(String src, String endsrc, int num) {
  FileInputStream fis = null;
  File file = null;
  try {
   fis = new FileInputStream(src);
   file = new File(src);
   //創(chuàng)建規(guī)定大小的byte數(shù)組
   byte[] b = new byte[num];
   int len = 0;
   //name為以后的小文件命名做準(zhǔn)備
   int name = 1;
   //遍歷將大文件讀入byte數(shù)組中，當(dāng)byte數(shù)組讀滿后寫入對(duì)應(yīng)的小文件中
   while ((len = fis.read(b)) != -1) {
    //分別找到原大文件的文件名和文件類型，為下面的小文件命名做準(zhǔn)備
    String name2 = file.getName();
    int lastIndexOf = name2.lastIndexOf(".");
    String substring = name2.substring(0, lastIndexOf);
    String substring2 = name2.substring(lastIndexOf, name2.length());
    FileOutputStream fos = new FileOutputStream(endsrc + "\\\\"+ substring + "-" + name + substring2);
    //將byte數(shù)組寫入對(duì)應(yīng)的小文件中
    fos.write(b, 0, len);
    //結(jié)束資源
    fos.close();
    name++;
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    if (fis != null) {
     //結(jié)束資源
     fis.close();
    }
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
 }
}