使用DES的加密和解密方法
对关键信息进行DES加密
首先编写一个DESUtils的类（对数据库中关键信息加密）：
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**
* 是一种加密算法
* @author Administrator
*
*/
public class DESUtils {
private static Key key;
private static String KEY_STR = "myKey";
private static String CHARSETNAME = "UTF-8";
private static String ALGORITHM = "DES";
static {
try {
//生成DES算法 对象
KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
//运用SHA1安全策略
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
//设置上秘钥种子
secureRandom.setSeed(KEY_STR.getBytes());
//初始化基于SHA1的算法对象
generator.init(secureRandom);
//生成秘钥对象
key = generator.generateKey();
generator = null;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* 获取加密后的信息
* @param str
* @return
*/
public static String getEncryptString(String str) {
BASE64Encoder base64encoder = new BASE64Encoder();
try {
byte[] bytes = str.getBytes(CHARSETNAME);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] doFinal = cipher.doFinal(bytes);
return base64encoder.encode(doFinal);
} catch (Exception e) {
// TODO: handle exception
throw new RuntimeException(e);
}
}
/**
* 获取解密后的信息
* @param str
* @return
*/
public static String getDecryptString(String str) {
//基于BASE64编码，接收byte[] 并转换成String
BASE64Decoder base64decoder = new BASE64Decoder();
try {
//将字符串decode成byte[]
byte[] bytes = base64decoder.decodeBuffer(str);
//获取解密对象
Cipher cipher = Cipher.getInstance(ALGORITHM);
//初始化解密信息
cipher.init(Cipher.DECRYPT_MODE, key);
//解密
byte[] doFinal = cipher.doFinal(bytes);
//返回解密之后的信息
return new String(doFinal, CHARSETNAME);
} catch (Exception e) {
// TODO: handle exception
throw new RuntimeException(e);
}
}
public static void main(String[] args) {
System.out.println(getEncryptString("work1111"));
System.out.println(getEncryptString("Pengliang11111111"));
}
}
编写一个EncryptPropertyPlaceholderConfigurer的类（对数据库中关键信息解密）：
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
public class EncryptPropertyPlaceholderConfigurer extends
PropertyPlaceholderConfigurer {
private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };
@Override
protected String convertProperty(String propertyName, String propertyValue) {
if (isEncryptProp(propertyName)) {
String decryptValue = DESUtils.getDecryptString(propertyValue);
return decryptValue;
} else {
return propertyValue;
}
}
private boolean isEncryptProp(String propertyName) {
for (String encryptpropertyName : encryptPropNames) {
if (encryptpropertyName.equals(propertyName))
return true;
}
return false;
}
}
在spring-dao.xml中的文件配置
