BufferedReader bufferedReader=new BufferedReader(filereader);

代码如下

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.RandomAccessFile;
import java.util.HashMap;

public class helloworld {
         private final static int len = 10000000;
         public static void splitfile(String src, String destfolder) throws Exception{
                 File f = new File(src);
                 long offset = 0;
                 int index = 0;
                while(offset<f.length()){
                         String fName = destfolder + "\\" + String.valueOf(index) + ".data";
                         writefile(src,offset,fName);
                         offset+=len;
                         index++;
                }   
         }
         public static void writefile(String srcfile, long offset, String destfile) throws Exception{
                 RandomAccessFile raf = new RandomAccessFile(srcfile,"r");
                 long bufflen = len;
                 if(bufflen + offset > raf.length()){
                         bufflen = raf.length()-offset;
                 }
                 byte[] buffer = new byte[(int) bufflen];
                 raf.seek(offset);
                 raf.read(buffer);
                 OutputStream fw = new FileOutputStream(destfile);
                 fw.write(buffer);
                 fw.close();
         }

      
         /**
          * @param args
          * @throws Exception
          * @throws IOException
          */
         public static void main(String[] args) throws IOException, Exception {
                 // TODO Auto-generated method stub
                 String path = "c:\\royntest\\wison1@ibm.nsf";
                 splitfile(path, "c:\\royntest");
         }

}