Java模板参数替换（类SPEL）

Java模板参数替换（类SPEL）

Java动态参数处理，类似SPEL，替换${变量名}为对应的变量值。

public class DynamicParamUtils {
    private static final String DYNAMIC_PARAM_PREFIX = "${";
    private static final String DYNAMIC_PARAM_SUFFIX = "}";
	
	// 当data不是k-v形式对象时，写入第一个变量
    public static String processDynamicParamWithSingleParam(String content, Object data) {
        int begin = content.indexOf(DYNAMIC_PARAM_PREFIX);
        int end = content.indexOf(DYNAMIC_PARAM_SUFFIX);
        if (begin == -1 || end == -1 || begin > end) {
            return content;
        }
        String substring = content.substring(begin, end + 1);
        return content.replace(substring, data.toString());
    }

	// 多变量，data 为 key - value 形式
    public static String processDynamicParams(String content, Object data) {
        int begin = content.indexOf(DYNAMIC_PARAM_PREFIX);
        int end = content.indexOf(DYNAMIC_PARAM_SUFFIX);
        if (begin == -1 || end == -1 || begin > end) {
            return content;
        }
        String startContent = content.substring(0, begin);
        String substring = content.substring(begin, end + 1);
        if (StringUtils.isNotEmpty(substring)) {
            String key = substring.replace("${", "").replace("}", "");
            JSONObject jsonObject = JSONObject.fromObject(data);
            Object value = jsonObject.get(key);
            if (value != null) {
                startContent = startContent + value.toString();
            } else {
                startContent += substring;
            }
        }

        int length = content.length();
        if ( length == end + 1) {
            return startContent;
        } else {
            return startContent + processDynamicParams(content.substring(end + 1, length), data);
        }
    }
}