使用流和带缓冲的流来拷贝文件

建立一般的流来拷贝文件：

public static void main(String[] args) throws Exception {

FileInputStream in = new FileInputStream("c:\\PC.xls");

FileOutputStream out = new FileOutputStream("d:\\PC1.xls");

int b;

while((b = in.read()) != -1) {//使用b读取输入流，在不为空的情况下使用输出流写入

out.write(b);

}

in.close();//最后请注意关闭不使用的流

out.close();

}

带缓冲的流：(更有效率.)

public static void main(String[] args) throws Exception {

FileInputStream in = new FileInputStream("c:\\card20.pdf");

FileOutputStream out = new FileOutputStream("d:\\abc.pdf");

FileChannel fc1 = in.getChannel();//得到流

FileChannel fc2 = out.getChannel();

ByteBuffer buffer = ByteBuffer.allocate(512);//以块为单位操作

while(fc1.read(buffer) != -1) {

buffer.rewind();

fc2.write(buffer);

buffer.clear();

}

in.close();

out.close();

}

posted on 2009-10-29 22:23 Infernus 阅读(219) 评论(0) 编辑收藏

Infernus-JXH