简单实现${}模板替换功能

/**
	* 简单实现${}模板功能
	* 如${aa} cc ${bb} 其中 ${aa}, ${bb} 为占位符. 可用相关变量进行替换
	* @param templateStr 模板字符串
	* @param data     替换的变量值
	* @param defaultNullReplaceVals  默认null值替换字符, 如果不提供, 则为字符串""
	* @return 返回替换后的字符串, 如果模板字符串为null, 则返回null
	*/
	
@SuppressWarnings("unchecked")
public static String simpleTemplate(String templateStr, Map<String, ?> data, String... defaultNullReplaceVals) {
	if(templateStr == null) return null;
	
	if(data == null) data = Collections.EMPTY_MAP;
		
	String nullReplaceVal = defaultNullReplaceVals.length > 0 ? defaultNullReplaceVals[0] : "";
	Pattern pattern = Pattern.compile("\\$\\{([^}]+)}");
		
	StringBuffer newValue = new StringBuffer(templateStr.length());

	Matcher matcher = pattern.matcher(templateStr);

	while (matcher.find()) {
		String key = matcher.group(1);
		String r = data.get(key) != null ? data.get(key).toString() : nullReplaceVal;
		matcher.appendReplacement(newValue, r.replaceAll("\\\\", "\\\\\\\\")); //这个是为了替换windows下的文件目录在java里用\\表示
	}

	matcher.appendTail(newValue);

	return newValue.toString();
}

//测试方法	
public static void main(String[] args) {
	String tmpLine = "简历:\n 姓名: ${姓} ${名} \n 性别: ${性别}\n 年龄: ${年龄} \n";
	Map<String, Object> data = new HashMap<String, Object>();
	data.put("姓", "wen");
	data.put("名", "66");
	data.put("性别", "man");
	data.put("年龄", "222");
		
	System.out.println(simpleTemplate(tmpLine, null, "--"));
}