ASCII码从小到大排序

ASCII码从小到大排序

用ASCII码按照字典序从小到大对参数名进行排序，并输出为字符串。

import java.util.*;

public class StringSortingUtil {

    public static void main(String[] args) {
        // 示例用法
        Map<String, String> params = new HashMap<>();
        params.put("appid", "asdfdadfasd");
        params.put("unionId", "ffeefefefe");
        params.put("bankId", "ewwfwf");

        String sortedResult = sortAndFormatParams(params);
        System.out.println("按字典序排序后的参数和字符串：");
        System.out.println(sortedResult);
    }

    public static String sortAndFormatParams(Map<String, String> params) {
        // 将Map转换为List以便排序
        List<Map.Entry<String, String>> entries = new ArrayList<>(params.entrySet());

        // 使用自定义的Comparator按照字符串的字典序（ASCII码顺序）排序
        entries.sort(new Comparator<Map.Entry<String, String>>() {
            @Override
            public int compare(Map.Entry<String, String> entry1, Map.Entry<String, String> entry2) {
                return entry1.getValue().compareTo(entry2.getValue());
            }
        });

        // 构建格式化后的字符串
        StringBuilder sortedString = new StringBuilder();
        for (Map.Entry<String, String> entry : entries) {
            sortedString.append(entry.getKey()).append(": ").append(entry.getValue()).append(", ");
        }

        // 删除末尾多余的逗号和空格
        if (sortedString.length() > 0) {
            sortedString.delete(sortedString.length() - 2, sortedString.length());
        }

        return sortedString.toString();
    }
}