import java.util.HashMap;      import java.util.Map;            import org.slf4j.Logger;      import org.slf4j.LoggerFactory;            /**      * 配置文件或模板中的占位符替换工具类      * Date: 15-5-8      * Time: 下午4:12      */      public class PlaceholderUtils {                private static final Logger logger = LoggerFactory.getLogger(PlaceholderUtils.class);                /**          * Prefix for system property placeholders: "${"          */          public static final String PLACEHOLDER_PREFIX = "${";          /**          * Suffix for system property placeholders: "}"          */          public static final String PLACEHOLDER_SUFFIX = "}";                public static String resolvePlaceholders(String text, Map
     
       parameter) {              if (parameter == null || parameter.isEmpty()) {                  return text;              }              StringBuffer buf = new StringBuffer(text);              int startIndex = buf.indexOf(PLACEHOLDER_PREFIX);              while (startIndex != -1) {                  int endIndex = buf.indexOf(PLACEHOLDER_SUFFIX, startIndex + PLACEHOLDER_PREFIX.length());                  if (endIndex != -1) {                      String placeholder = buf.substring(startIndex + PLACEHOLDER_PREFIX.length(), endIndex);                      int nextIndex = endIndex + PLACEHOLDER_SUFFIX.length();                      try {                          String propVal = parameter.get(placeholder);                          if (propVal != null) {                              buf.replace(startIndex, endIndex + PLACEHOLDER_SUFFIX.length(), propVal);                              nextIndex = startIndex + propVal.length();                          } else {                              logger.warn("Could not resolve placeholder '" + placeholder + "' in [" + text + "] ");                          }                      } catch (Exception ex) {                          logger.warn("Could not resolve placeholder '" + placeholder + "' in [" + text + "]: " + ex);                      }                      startIndex = buf.indexOf(PLACEHOLDER_PREFIX, nextIndex);                  } else {                      startIndex = -1;                  }              }              return buf.toString();          }                    public static void main(String[] args) {              String aa= "我们都是好孩子,${num}说是嘛？ 我觉得${people}是傻蛋!";              Map
      
        map = new HashMap
       
        ();              map.put("num","小二比");              map.put("people","小明");              System.out.println(PlaceholderUtils.resolvePlaceholders(aa, map));          }            }