关于DES算法解密,为了安全,不想留下解密后的文件,只要在代码里面正常读取出来就可以了。这样怎么操作?
/**
* 文件采用DES算法解密文件
* @param file 已加密的文件 如/mnt/以加密.txt
* @param destFile 解密后存放的文件名 如/mnt/解密后文件.txt
*/
public void decrypt(String file, String dest) throws Exception {
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, this.key);
InputStream is = new FileInputStream(file);
OutputStream out = new FileOutputStream(dest);
CipherOutputStream cos = new CipherOutputStream(out, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = is.read(buffer)) >= 0) {
System.out.println("r="+r);
System.out.println("buffer="+buffer);
cos.write(buffer, 0, r);
}
cos.close();
out.close();
is.close();
}