方法一：编写排序方法

public List<Map.Entry<String, String>> sortMap(Map<String, String> map) {
        final List<Map.Entry<String, String>> infos = new ArrayList<Map.Entry<String, String>>(map.entrySet());

        // 重写集合的排序方法：按字母顺序
        Collections.sort(infos, new Comparator<Map.Entry<String, String>>() {
            @Override
            public int compare(Map.Entry<String, String> o1, Map.Entry<String, String> o2) {
                return (o1.getKey().compareTo(o2.getKey()));
            }
        });

        return infos;
    }

方法二：使用stream的排序方法

List<Map.Entry<String, String>> sort = new ArrayList();
map.entrySet().stream().sorted(Map.Entry.<String, String>comparingByKey())
    .forEachOrdered(paramEntry -> sort.add(paramEntry));