按字母顺序排列.properties文件中的键，同时忽略区分大小写

Question

我有一个函数，它将.properties文件中的值存储到树映射（translatedMap）中，然后从“keymap”中检索新值并将它们也存储到“translatedMap”中。问题是，无论我做什么，似乎总是把大写键和非大写键分开。下面是我的代码：

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();
    }
}

我得到的输出是这样的：

当我想让它出来的时候：

alowercase.key=value3
alother lowercase.key=value4
capitalized_key1=value1
capitalized_key2=value2
more lowercase.keys=value5

Answer 1

属性未排序。插入它们的顺序并不重要，或者如果使用排序的东西调用putAll（），它们就扩展了哈希表。看这里。