java - 按字母顺序对 .properties 文件中的键进行排序，同时忽略大小写

Question

我有一个函数，它将 .properties 文件中的值存储到树形图 (translatedMap) 中，然后从“keyMap”中检索新值并将它们存储到“translatedMap”中。问题是，无论我做什么，似乎总是将大写键与非大写键分开。这是我的代码:

Properties translation = new Properties(){

        private static final long serialVersionUID = 1L;

        @Override
        public synchronized Enumeration<Object> keys() {

            return Collections.enumeration(new TreeSet<Object>(super
                    .keySet()));
        }

    };


    //creates file and stores values of keyMap into the file
    try {
        TreeMap<String, String> translatedMap = new TreeMap<String, String>(String.CASE_INSENSITIVE_ORDER);

        InputStreamReader in = new InputStreamReader(new FileInputStream(filePath), "UTF-8");
        translation.load(in);

        // Store all values to TreeMap and sort
        Enumeration<?> e = translation.propertyNames();
        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            if (key.matches(".#")) {
            } else {
                String value = translation.getProperty(key);
                translatedMap.put(key, value);
            }
        }

        // Add new values to translatedMap
        for (String key : keyMap.keySet()) {
            // Handle if some keys have already been added; delete so they can be re-added
            if (translatedMap.containsKey(key)) {
                translatedMap.remove(key);
            }
            translatedMap.put(key, keyMap.get(key));
        }

        in.close();
        translation.putAll(translatedMap);
        File translationFile = new File(filePath);

        OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(translationFile, false), "UTF-8");
        translation.store(out, null);

        out.close();
    } catch (IOException e) {
            e.printStackTrace();
    }
}

我得到的输出类似于:

CAPITALIZED_KEY1=value1
CAPITALIZED_KEY2=value2
alowercase.key=value3
anotherlowercase.key=value4
morelowercase.keys=value5

当我希望它出现时:

alowercase.key=value3
anotherlowercase.key=value4
CAPITALIZED_KEY1=value1
CAPITALIZED_KEY2=value2
morelowercase.keys=value5

Answer 1

属性未排序。无论您插入其中的顺序是什么，或者如果您使用已排序的内容调用 putAll()，它们都会扩展 Hashtable。请参阅here .