(转)java安全删除某个文件
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.security.SecureRandom;
public class SecureDelete {
public static void main(String[] args) throws IOException {
File file = new File(args[0]);
if (file.exists()) {
SecureRandom random = new SecureRandom();
RandomAccessFile raf = new RandomAccessFile(file, "rw");
FileChannel channel = raf.getChannel();
MappedByteBuffer buffer
= channel.map(FileChannel.MapMode.READ_WRITE, 0, raf.length());
// overwrite with zeros
while (buffer.hasRemaining()) {
buffer.put((byte) 0);
}
buffer.force();
buffer.rewind();
// overwrite with ones
while (buffer.hasRemaining()) {
buffer.put((byte) 0xFF);
}
buffer.force();
buffer.rewind();
// overwrite with random data; one byte at a time
byte[] data = new byte[1];
while (buffer.hasRemaining()) {
random.nextBytes(data);
buffer.put(data[0]);
}
buffer.force();
file.delete();
}
}
}
//该片段来自于http://www.codesnippet.cn/detail/03122012774.html
其中用到了NIO,其实就是用混乱的数据重新填充下文件
