DES 檔案加密解密

public class desfileutils else

string file = newpath + filename;
//新建路徑，目標目錄為:原路徑/encypt
string path = newpath + "encypt" + file.separator;
file f = new file(path);
if(!f.exists())
string destfile = path + filename;
trycis.close();
is.close();
out.close();
}catch(exception e)
//返回加密後的檔案路徑
return destfile.tostring();
}/**
* 對加密檔案進行解密
* @param file 已加密的檔案
* @param dest 解密後的檔案（應與原始檔相同）
* @return 解密後的檔案路徑
* @throws exception
*/public string decrypt(string filepath, string filename, string key)throws exceptionelse
//待解密檔案路徑
string file = newpath + filename;
//解密後檔案路徑
filepath = newpath + "decypt" + file.separator;
file f = new file(filepath);
if(!f.exists())
string destfile = filepath + filename;
trycos.close();
out.close();
is.close();
logger.info("檔案解密成功");
}catch(exception e)
return destfile.tostring();
}

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