有没有办法不止一次迭代HttpServletRequest.getAttributeNames()？

HttpServletRequest request = ... // 获取HttpServletRequest对象
Enumeration<String> attributeNames = request.getAttributeNames();
List<String> attributeNameList = new ArrayList<>();

while (attributeNames.hasMoreElements()) {
    String attributeName = attributeNames.nextElement();
    attributeNameList.add(attributeName);
}

// 遍历集合获取所有属性的名称
for (String attributeName : attributeNameList) {
    // 处理属性名称
    // ...
}

import org.apache.commons.collections4.IteratorUtils;

HttpServletRequest request = ... // 获取HttpServletRequest对象
Enumeration<String> attributeNames = request.getAttributeNames();
List<String> attributeNameList = IteratorUtils.toList(attributeNames);

// 遍历集合获取所有属性的名称
for (String attributeName : attributeNameList) {
    // 处理属性名称
    // ...
}