DES加密解密实现

package com.liuhq.o2o.utils;

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

@SuppressWarnings("restriction")
public class DESUtil {

    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);
            // 运行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);
        }
    }
    
    /**
     * 加密
     * @param str
     * @return
     */
    public static String getEncryptString(String str) {
        // 基于BADE64编码  接受byte[]并转化为String
        BASE64Encoder base64encoder = new BASE64Encoder();
        try {
            // 按UTF8编码
            byte[] bytes = str.getBytes(CHARSETNAME);
            // 获取加密对象
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            // 初始化密码信息
            cipher.init(Cipher.ENCRYPT_MODE, key);
            // 加密
            byte[] doFinal = cipher.doFinal(bytes);
            // byte[] to encode好的string返回
            return base64encoder.encode(doFinal);
        } catch (Exception e) {
            // TODO: handle exception
            throw new RuntimeException(e);
        }
    }

    /**
     * 解密
     * @param str
     * @return
     */
    public static String getDecryptString(String str) {
        // 基于BADE64编码  接受byte[]并转化为String
        
        BASE64Decoder base64decoder = new BASE64Decoder();
        try {
            //将字符串decode成byte[]
            byte[] bytes = base64decoder.decodeBuffer(str);
            // 获取加密对象
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            // 初始化密码信息
            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("root"));
        System.out.println(getEncryptString("123456"));
       
      
    }

}

 解密jdbc.properties配置文件

创建EncryptPropertyPlaceholderConfigurer类

package com.liuhq.o2o.utils;

import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

public class EncryptPropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer{
    
     // 需要解密的数组
    private String[] encryptPropNames = { "jdbc.username", "jdbc.password" };

    @Override
    protected String convertProperty(String propertyName, String propertyValue) {
        if (isEncryptProp(propertyName)) {
            String decryptValue = DESUtil.getDecryptString(propertyValue);
            return decryptValue;
        } else {
            return propertyValue;
        }
    }

    private boolean isEncryptProp(String propertyName) {
        for (String encryptpropertyName : encryptPropNames) {
            if (encryptpropertyName.equals(propertyName))
                return true;
        }
        return false;
    }

}

替换<context:property-placeholder location="classpath:jdbc.properties"/>配置

新的为

<bean class="com.liuhq.o2o.utils.EncryptPropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
            </list>
        </property>
        <property name="fileEncoding" value="UTF-8" />
    </bean>