1 /*
 2  * 基于口令的对称加密
 3  */
 4 private static void secretEncrypt() throws Exception{
 5             //实例化工具
 6            Cipher     cipher2=Cipher.getInstance("PBEWithMD5AndDES");
 7
 8             //使用该工具将基于密码的形式生成Key
 9            SecretKey key2=SecretKeyFactory.getInsance("PBEWithMD5AndDES").generateSecret(new PBEKeySpec("123".toCharArray()));
10
11            PBEParameterSpec parameterspec=new PBEParameterSpec(new byte[]{1,2,3,4,5,6,7,8},1000);
12
13            //初始化加密操作，同时传递加密的算法
14           cipher2.init(Cipher.ENCRYPT_MODE,key2,parameterspec);
15
16           //将要加密的数据传递进去，返回加密后的数据
17      byte[] results =cipher2.doFinal("哈哈哈哈".getBytes());
18
19
20          //将加密后的数据写入到文件中
21       FileOutputStream fosData =new FileOutputStream("zxx.dat");
22        fosData.write(results);
23        fosData.close();
24
25 }

 1 private static void secretDecrypt() throws Exception{
 2     Cipher cipher2=Cipher.getInstance("PBEWithMD5AndDES");
 3     SecretKey key2=SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(new PBEKeySpec("123".toCharArray()));
 4     PBEParameterSpec parameterspec=new PBEParameterSpec(new byte[]{1,2,3,4,5,6,7,8},1000);
 5     cipher2.init(Cipher.DECRYPT_MODE,key2,parameterspec);
 6     FileInputStream fisDat=new FileInputStream("zxx.dat");
 7
 8    byte[] src=new byte[fisDat.available()];
 9    int len=fisDat.read(src);
10    int total=0;
11
12    while(total<src.length){
13    total+=len;
14    len=fisDat.read(src,total,src,length-total);
15    }
16    byte[] result=cipher2.doFinal(src);
17    fisDat.close();
18    System.out.println(new String(result));
19
20
21 }