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換工具類 * 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<String, String> 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= "我們都是好孩子,${num}說是嘛？ 我覺得${people}是傻蛋!"; Map<String, String> map = new HashMap<String, String>(); map.put("num","小二比"); map.put("people","小明"); System.out.println(PlaceholderUtils.resolvePlaceholders(aa, map)); } }

　　

轉載于:https://www.cnblogs.com/toSeeMyDream/p/6814430.html

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