public static void copyFile(File srcFile,File destFile) throws IOException{

if(!srcFile.exists()) {

throw new IllegalArgumentException("文件名:"+srcFile+"不存在");

}

if(!srcFile.isFile()) {

throw new IllegalArgumentException(srcFile+"不是文件");

}

FileInputStream fis = new FileInputStream(srcFile);

FileOutputStream fos = new FileOutputStream(destFile);

byte[] buf = new byte[8*1024];

int b = fis.read(buf,0,buf.length);//读取数据放到字节数组里

while(b!=-1) {

fos.write(buf, 0, b);//写入数据到流

fos.flush();//最好写上

}

fis.close();

fos.close();

System.out.println("拷贝完毕");

}

public static void main(String[] args){

// TODO Auto-generated method stub

// FileUtils.listDirectory(new File("E:\\example"));

try {

IOUtil.copyFile(new File("E:\\example\\original.txt"), new File("E:\\example\\new.txt"));

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}