Java模板解析${}格式

Java模板解析${}格式

本文连接：https://www.cnblogs.com/muphy/p/15159624.html

/**
 * 模板解析
 *
 * @param template   模板字符串 如：My name is ${name}, i am ${age} years old! ${sayHai}
 * @param properties map接口的集合，如： {name: "azi", age: 18, sex: "man"}
 * @return: 解析后的字符串，如： My name is azi, i am 18 years old!
 * @author: 若非
 * @date: 2021/8/19 3:03
 */
public static String parseTemplate(String template, Map properties) {
    if (template == null || template.isEmpty() || properties == null) {
        return template;
    }
    String r = "\\$\\{([^\\}]+)\\}";
    Pattern pattern = Pattern.compile(r);
    Matcher matcher = pattern.matcher(template);
    while (matcher.find()) {
        String group = matcher.group();
        Object o = properties.get(group.replaceAll(r, "$1"));
        if (o != null) {
            template = template.replace(group, String.valueOf(o));
        } else {
            template = template.replace(group, "");
        }
    }
    return template;
}

 测试

public static void main(String[] args) throws IOException {
    Map<String, Object> map = new HashMap<>();
    map.put("name", "azi");
    map.put("age", 18);
    map.put("sex", "man");
    String s = parseTemplate("My name is ${name}, i am ${age} years old! ${sayHai}", map);
    System.out.println(s);
}