spring如何获得properties文件里面的数据

spring怎么获得properties文件里面的数据？
我写了一个解密类读取properties里面的数据库帐号和密码然后解密，为什么在需要操作数据库的时候，拿的还是我加密的密文，而没经过解密的方法了？有什么办法可以让spring去拿的是解密后的帐号密码，而不是密文

[解决办法]
提供个比较使用的读取某种命名类型的properties文件都Map中：
使用：PropertiesUtils.getAll();

Java code

package com.commons;import java.io.IOException;import java.io.InputStreamReader;import java.io.Reader;import java.util.HashMap;import java.util.Map;import java.util.Properties;import org.springframework.core.io.Resource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.core.io.support.ResourcePatternResolver;public class PropertiesUtils {    private static ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();    private static final String DEFAULT_RESOURCE_PATTERN = "classpath:*-tag.properties";    private static final Map<Object, Object> all = new HashMap<Object, Object>();    public static Map<Object, Object> getAll() {    return all;    }    static {    try {        Resource[] resources = resourcePatternResolver            .getResources(DEFAULT_RESOURCE_PATTERN);        if (resources != null) {        for (Resource r : resources) {            Reader in = new InputStreamReader(r.getInputStream(),                "UTF-8");            Properties p = new Properties();            p.load(in);            all.putAll(p);            in.close();        }        }    } catch (IOException e) {        e.printStackTrace();    }    }}