Java 替换字符串中${paramname}

    public static String getContentWithData(String template, Map params){
        String pattern = "\$\{(.+?)\}";
        Pattern p = Pattern.compile(pattern);
        Matcher m = p.matcher(template);
        StringBuffer sb = new StringBuffer();
        while (m.find()){
            String key = m.group(1);
            Object value = params.get(key);
            m.appendReplacement(sb, value == null ? "" : StringUtilExt.getStr(value));
        }
        m.appendTail(sb);
        return sb.toString();
    }