Java加密数据库

 1 import java.security.Key;
 2 import java.security.SecureRandom;
 3 
 4 import javax.crypto.Cipher;
 5 import javax.crypto.KeyGenerator;
 6 
 7 import sun.misc.BASE64Decoder;
 8 import sun.misc.BASE64Encoder;
 9 
10 public class DESUtils {
11 
12     private static Key key;
13     // 设置密钥key
14     private static String KEY_STR = "myKey";
15     private static String CHARSETNAME = "UTF-8";
16     private static String ALGORITHM = "DES";
17 
18     // 静态代码块
19     static {
20         try {
21             // 生成DES算法对象
22             KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
23             // 运用SHA1安全策略
24             SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
25             // 设置上密钥种子
26             secureRandom.setSeed(KEY_STR.getBytes());
27             // 初始化基于SHA1的算法对象
28             generator.init(secureRandom);
29             // 生成密钥对象
30             key = generator.generateKey();
31             generator = null;
32         } catch (Exception e) {
33             throw new RuntimeException(e);
34         }
35     }
36 
37     /**
38      * 获取加密后的信息
39      * 
40      * @param str
41      * @return
42      */
43     public static String getEncryptString(String str) {
44         // 基于BASE64编码，接收byte[]并转换为String
45         BASE64Encoder base64encoder = new BASE64Encoder();
46         try {
47             // 按UTF-8编码
48             byte[] bytes = str.getBytes(CHARSETNAME);
49             // 获取加密对象
50             Cipher cipher = Cipher.getInstance(ALGORITHM);
51             // 初始化密码信息
52             cipher.init(Cipher.ENCRYPT_MODE, key);
53             // 加密
54             byte[] doFinal = cipher.doFinal(bytes);
55             // byte[] to encode好的String并返回
56             return base64encoder.encode(doFinal);
57         } catch (Exception e) {
58             // TODO: handle exception
59             throw new RuntimeException(e);
60         }
61     }
62 
63     /**
64      * 获取解密后的信息
65      * 
66      * @param str
67      * @return
68      */
69     public static String getDecryptString(String str) {
70         //基于BASE64编码，接收byte[]并转换为String
71         BASE64Decoder base64decoder = new BASE64Decoder();
72         try {
73             //将字符串decode为byte[]
74             byte[] bytes = base64decoder.decodeBuffer(str);
75             //获取解密对象
76             Cipher cipher = Cipher.getInstance(ALGORITHM);
77             //初始化解密信息
78             cipher.init(Cipher.DECRYPT_MODE, key);
79             //解密
80             byte[] doFinal = cipher.doFinal(bytes);
81             //返回解密之后的信息
82             return new String(doFinal, CHARSETNAME);
83         } catch (Exception e) {
84             // TODO: handle exception
85             throw new RuntimeException(e);
86         }
87     }
88 
89     public static void main(String[] args) {
90         System.out.println(getEncryptString("root"));
91         System.out.println(getEncryptString("123654"));
92         
93     }
94 
95 }

 1 import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
 2 
 3 public class EncryptPropertyPlaceholderConfigurer extends
 4         PropertyPlaceholderConfigurer {
 5     //需要加密的字段数组
 6     private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };
 7     /**
 8      * 对关键的属性进行转换
 9      */
10     @Override
11     protected String convertProperty(String propertyName, String propertyValue) {
12         if (isEncryptProp(propertyName)) {
13             //对已加密的字段进行阶段工作
14             String decryptValue = DESUtils.getDecryptString(propertyValue);
15             return decryptValue;
16         } else {
17             return propertyValue;
18         }
19     }
20     /**
21      * 该属性是否已经加密
22      * @param propertyName
23      * @return
24      */
25     private boolean isEncryptProp(String propertyName) {
26         //若等于需要加密的field，则进行加密
27         for (String encryptpropertyName : encryptPropNames) {
28             if (encryptpropertyName.equals(propertyName))
29                 return true;
30         }
31         return false;
32     }
33 }