Helper种：读取Properties文件

Helper类：读取Properties文件

1. Properties文件

    message.properties:

    dmwdp.app.name=${dmwdp.app.name}

2. 本机OS Properties文件

     dmwdp-commons.properties:

     dmwdp.app.name=DMWDP

3.  读取类

      public class MessagePropertiesReader {

           private static final Logger LOGGER = Logger.getLogger(MessagePropertiesReader.class);
           private static Properties props = new Properties();

          private MessagePropertiesReader() {
          }

          static {
                try {
                      final InputStream inoutStream =

                             MessagePropertiesReader.class.getResourceAsStream("/message.properties");
                      props.load(inoutStream);
                } catch (Exception e) {
                      if (LOGGER.isDebugEnabled()) {
                            LOGGER.debug("MessagePropertiesReader error", e);
                      }
                }
           }

          /**
               * 根据key返回对应的value
               * @param key properties文件中对应的key
               * @return key对应的value
               * @author FDC
          */
          public static String getMessageByKey(String key) {
                  return props.getProperty(key);
           }

           public static void main(String args[]) {
                  System.out.println(MessagePropertiesReader.getMessageByKey("dmwdp.app.name"));
          }
     }