文件的复制

package struts;

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

public class CopyFile {
    public static void main(String[] args) {
        String newPath = "d:/stu.xls";
        String oldPath = "e:/students.xls";
        int sum = 0;
        int bytered = 0;
        File oldFile = new File("d:/a.txt");
        if(oldFile.exists()){
            try {
                InputStream inStream = new FileInputStream(oldPath);
                OutputStream outStream = new FileOutputStream(newPath);
                byte[] buffer = new byte[1000]; 
                try {
                    while((bytered = inStream.read(buffer))!=-1){
                        System.out.println(bytered);
                        sum += bytered;
                        System.out.println(sum);
                        outStream.write(buffer, 0, bytered);
                        
                    }
                    inStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
            
        }
    }
}