利用正则替换{key}

• 需求：
  使用对应值替换/home/test/{prvId}/{issueNo}/{gameId}/模版中的{key}，key的顺序变化时也能正确替换。

public class StringFormatUtil {

    //匹配{key}的正则
    private static final Pattern PATTERN = Pattern.compile("\\{(.*?)\\}");
    private static Matcher matcher;

    /**
     * 替换{key}占位符
     * @param sourStr 需要替换的模版
     * @param param 参数map，map的key与模版中的key对应
     * @return
     */
    public static String stringFormat(String sourStr, Map<String, Object> param) {

        String targetStr = sourStr;
        if (param == null) {
            return targetStr;
        }

        matcher = PATTERN.matcher(targetStr);

        while (matcher.find()) {
            //
            String key = matcher.group();
            //去掉{}，保留其中的key值
            String keyClone = key.substring(1, key.length() - 1).trim();
            Object value = param.get(keyClone);

            //替换
            if (value != null) {
                targetStr = targetStr.replace(key, value.toString());
            }
        }

        return targetStr;
    }

    /**
     * 替换{key}占位符
     * @param sourStr 需要替换的模版
     * @param paramObj 参数对象，字段名与{key}对应
     * @return
     */
    public static String stringFormat(String sourStr, Object paramObj) {

        String targetStr = sourStr;
        if (paramObj == null) {
            return targetStr;
        }

        PropertyDescriptor pd;
        Method method;

        while (matcher.find()) {
            String key = matcher.group();
            String keyClone = key.substring(1, key.length() - 1).trim();
            try {
                pd = new PropertyDescriptor(keyClone, paramObj.getClass());
                method = pd.getReadMethod();
                Object value = method.invoke(paramObj);
                if (value != null) {
                    targetStr = targetStr.replace(sourStr, value.toString());
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        return targetStr;
    }
}

• 测试

public static void main(String[] args) {

        String path = "/home/test/{prvId}/{issueNo}/{gameId}/";
        Map<String, Object> params = new HashMap<>();
        params.put("gameId", "gameid");
        params.put("issueNo", "issueno");
        params.put("prvId", "prvid");

        String result = StringFormatUtil.stringFormat(path, params);
        System.out.println(result);
    }

• 效果

/home/test/prvid/issueno/gameid/