jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://xxx.xxx.xxx.xxx.:3306/xxx?useUnicode=true&characterEncoding=utf8
jdbc.username=4YR65mbD1+c=
jdbc.password=mcWsjuuMs6MrfnkytW37XA==

package com.sane.o2o.util;

import org.apache.commons.collections.CollectionUtils;
import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;

public class EncryptPropertyPlaceHolderConfiger extends PropertyPlaceholderConfigurer {
    private String[] encryptPropNames={"jdbc.username","jdbc.password"};
    @Override
    protected String convertProperty(String propertyName, String propertyValue) {
        if(isEncryptProp(propertyName)){
            String descryptValue=DesUtil.getDecryptString(propertyValue);
            return  descryptValue;
        }else{
            return  propertyValue;
        }
    }

    private boolean isEncryptProp(String propName){
        return Arrays.asList(encryptPropNames).contains(propName);
    }
}

public class DesUtil {
    private static Key key;
    private static  String KEY_SALT="自己填寫隨意的鹽值";
    private static String CHARSETNAME="UTF-8";
    private static String ALGORITHM="DES";
    static {
        try {
            //生產(chǎn)DES算法對象
            KeyGenerator keyGenerator=KeyGenerator.getInstance(ALGORITHM);
            //運行SHA1安全策略
            SecureRandom secureRandom=SecureRandom.getInstance("SHA1PRNG");
            //設置秘鑰種子
            secureRandom.setSeed(KEY_SALT.getBytes());
            //初始化基于SHA1的算法對象
            keyGenerator.init(secureRandom);
            key=keyGenerator.generateKey();
        }catch (Exception e){
            throw  new RuntimeException(e.getMessage());
        }
    }

    public static String getEncryptString(String str){
        try {
            BASE64Encoder base64Encoder=new BASE64Encoder();
            //按照UTF-8編碼
            byte[] bytes=str.getBytes(CHARSETNAME);
            //獲取加密對象
            Cipher cipher=Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE,key);
            //加密
            byte[] doFinal=cipher.doFinal(bytes);
            return base64Encoder.encode(doFinal);
        } catch (Exception e) {
            throw  new RuntimeException(e.getMessage());

        }
    }

    public static String getDecryptString(String str){
        BASE64Decoder base64Decoder=new BASE64Decoder();
        try {
            byte[] bytes=base64Decoder.decodeBuffer(str);
            Cipher cipher=Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE,key);
            byte[] doFinal=cipher.doFinal(bytes);
            return new String(doFinal,CHARSETNAME);
        }catch (Exception ex){
            throw  new RuntimeException(ex.getMessage());

        }
    }

    public static void main(String args[]){
        System.out.println(getEncryptString("root"));
        System.out.println(getDecryptString("4YR65mbD1+c="));

        System.out.println(getEncryptString("1Qaz#0Okm"));
        System.out.println(getDecryptString("mcWsjuuMs6MrfnkytW37XA=="));
    }
}

<bean id="propertyConfigurer" class="com.sane.o2o.util.EncryptPropertyPlaceHolderConfiger">
        <property name="ignoreResourceNotFound" value="true"></property>
        <property name="fileEncoding" value="UTF-8"></property>
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
            </list>
        </property>
    </bean>