java DES加密文件上传数据库，下载解密文件

1、获取固定秘钥：8位的

/** * 固定key *  * @return */public Key getKey() {Key deskey = null;try {// 固定密钥byte[] buffer = new byte[] { 0x47, 0x33, 0x43, 0x4D, 0x4F, 0x50,0x31, 0x32 };deskey = (Key) new SecretKeySpec(buffer, "DES");} catch (Exception e) {throw new RuntimeException("Error initializing SqlMap class. Cause: " + e);}return deskey;}

2、加密方法：

/** * 加密01 * @param src * @param deskey * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException */public byte[] Encrytor(byte[] src, Key deskey)throws InvalidKeyException, IllegalBlockSizeException,BadPaddingException, NoSuchAlgorithmException,NoSuchPaddingException {Cipher c = Cipher.getInstance("DES/ECB/NoPadding");// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式c.init(Cipher.ENCRYPT_MODE, deskey);byte[] doFinal = c.doFinal(src);return doFinal;}/** * 加密方法02 * @param is * @param deskey * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws NoSuchAlgorithmException * @throws NoSuchPaddingException */public CipherInputStream Encrytor02(InputStream is, Key deskey)throws InvalidKeyException, IllegalBlockSizeException,BadPaddingException, NoSuchAlgorithmException,NoSuchPaddingException {Cipher c = Cipher.getInstance("DES/ECB/NoPadding");// 根据密钥，对Cipher对象进行初始化，ENCRYPT_MODE表示加密模式c.init(Cipher.ENCRYPT_MODE, deskey);CipherInputStream cis = new CipherInputStream(is, c); return cis;}

3、解密方法

/** * 对字符串解密 *  * @param buff * @return * @throws InvalidKeyException * @throws IllegalBlockSizeException * @throws BadPaddingException * @throws NoSuchPaddingException * @throws NoSuchAlgorithmException */public byte[] Decryptor(byte[] buff, Key deskey)throws InvalidKeyException, IllegalBlockSizeException,BadPaddingException, NoSuchAlgorithmException,NoSuchPaddingException {Cipher c = Cipher.getInstance("DES/ECB/NoPadding");// 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式c.init(Cipher.DECRYPT_MODE, deskey);byte[] doFinal = c.doFinal(buff);return doFinal;}

4、InputStream 转 byte[]

      

/** * InputStream 转 byte[] * @param iStrm * @return * @throws IOException */public byte[] InputStreamToByte(InputStream iStrm) throws IOException {ByteArrayOutputStream bytestream = new ByteArrayOutputStream();int ch;byte[] buf = new byte[1024];while ((ch = iStrm.read()) != -1){bytestream.write(buf, 0, ch);}byte imgdata[]=bytestream.toByteArray();bytestream.close();return imgdata;}

5、加密文件导入数据库

                EncrypDes encrypDes = new EncrypDes();Key key = encrypDes.getKey();System.out.println(key);long sqlstart = System.currentTimeMillis();// 开始时间File file = new File("D:/Icon.txt");FileInputStream in = new FileInputStream(file);CipherInputStream cin = encrypDes.Encrytor02(in, key);Connection con = null;// 创建一个数据库连接PreparedStatement pre = null;// 创建预编译语句对象，一般都是用这个而不用StatementResultSet result = null;// 创建一个结果集对象// /*try {con = JdbcOracleUtil.getConn02("");System.out.println(con != null ? "成功" : "失败" + "连接成功！");String sql = "Insert INTO  FI_FILE (ID,FILECONTENT) values ( FIFILE_SEQ.nextVal ,? ) ";pre = con.prepareStatement(sql);ByteArrayOutputStream bAOutputStream = new ByteArrayOutputStream();int ch;while ((ch = cin.read()) != -1) {bAOutputStream.write(ch);}byte data[] = bAOutputStream.toByteArray();System.out.println(data);bAOutputStream.close();pre.setBytes(1, data);// 4.执行语句int i = pre.executeUpdate();System.out.println(i);} catch (Exception e) {e.printStackTrace();} finally {try {// 逐一将上面的几个对象关闭，因为不关闭的话会影响性能、并且占用资源// 注意关闭的顺序，最后使用的最先关闭if (result != null)result.close();if (pre != null)pre.close();if (con != null)con.close();System.out.println("数据库连接已关闭！");} catch (Exception e) {e.printStackTrace();}}long sqlend = System.currentTimeMillis(); // 结束时间System.out.println("上传文件用时：" + (sqlend - sqlstart) / 1000 + " s");System.out.println("上传文件用时：" + (sqlend - sqlstart) + "  ms ");

6、解密文件展示

                EncrypDes encrypDes = new EncrypDes();Key key = encrypDes.getKey();System.out.println(key);long sqlstart = System.currentTimeMillis();// 开始时间File file = new File("D:/Icon.txt");FileInputStream in = new FileInputStream(file);CipherInputStream cin = encrypDes.Encrytor02(in, key);Connection con = null;// 创建一个数据库连接PreparedStatement pre = null;// 创建预编译语句对象，一般都是用这个而不用StatementResultSet result = null;// 创建一个结果集对象try {con = JdbcOracleUtil.getConn02("");System.out.println(con != null ? "成功" : "失败" + "连接成功！");String sql = "select * from Fi_File where ID=16";// String sql="select * from Fi_Fileinfo where fileid=97 ";pre = con.prepareStatement(sql);// 4.执行语句ResultSet reset = pre.executeQuery();byte[] bis = null;while (reset.next()) {bis = reset.getBytes("FILECONTENT");}byte[] doFinal = encrypDes.Decryptor(bis, key);// Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");// cipher.init(Cipher.DECRYPT_MODE, key);// byte[] doFinal = cipher.doFinal(bis);System.out.println(doFinal);System.out.println(new String(doFinal, "GB2312"));} catch (Exception e) {System.out.println(e);} finally {try {// 逐一将上面的几个对象关闭，因为不关闭的话会影响性能、并且占用资源// 注意关闭的顺序，最后使用的最先关闭if (result != null)result.close();if (pre != null)pre.close();if (con != null)con.close();System.out.println("数据库连接已关闭！");} catch (Exception e) {e.printStackTrace();}}long sqlend02 = System.currentTimeMillis(); // 结束时间System.out.println("上传文件用时：" + (sqlend02 - sqlstart) / 1000 + " s");System.out.println("上传文件用时：" + (sqlend02 - sqlstart) + "  ms ");