封装一个按Key排序的Map工具

Map是集合的存放顺序是按哈希值定的，有时候不是我们需要的，当想要一个按自己规定顺序存放顺序，可以用LinkedHashMap，这里自己把LinkedHashMap封装了一次

package test.com.reflect;

import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

public class MapUtill {
    public static void main(String[] args) {
        Map<Object,Object> map1 = newMap("{'id':'主键','age':'年龄','name':'姓名','className':'班级','area':{'code':'代码','name':'地名','as':'的'},'strs':'发大发'} ",true);
        System.err.println(map1);
        // --------------------------------------------------------------------------------
        Map<Integer,String> map = new HashMap<>();
        map.put(2342, "a1");
        map.put(1231, "a2");
        map.put(24355, "a3");
        map.put(123, "a4");
        System.err.println(map);
        // --------------------------------------------------------------------------------
        Object[] arr = sortKeysArray(map,new Comparator<Integer>() {

            @Override
            public int compare(Integer o1, Integer o2) {
                return o1-o2;
            }

        });
        System.err.println(Arrays.toString(arr));
        // --------------------------------------------------------------------------------
        Set<Integer> set = sortKeysSet(map,new Comparator<Integer>() {

            @Override
            public int compare(Integer o1, Integer o2) {
                return o1-o2;
            }

        });
        System.err.println(set);
        // --------------------------------------------------------------------------------
        List<Integer> list = sortKeysList(map,new Comparator<Integer>() {

            @Override
            public int compare(Integer o1, Integer o2) {
                return o1-o2;
            }

        });
        System.err.println(list);

    }
    /** 返回一个按添加顺序存放的map
     * @return
     */
    public static <V, K> Map<K,V> newMap(){
        return new LinkedHashMap<K,V>();
    }

    public static Map<Object,Object> newMap(String txt){
        return newMap(txt,false);
    }

    /**
     * @param txt Map字符串
     * @param sort 是否按txt 排序生成
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static  Map<Object,Object> newMap(String txt,Boolean sort){
        com.alibaba.fastjson.JSONObject jsonObj = com.alibaba.fastjson.JSONObject.parseObject(txt);
        if(!sort) {
            return (Map)jsonObj;
        }
        final String  t = txt;
//        Map<String, Object> rs = sort(jsonObj,new Comparator<String>() {
//            @Override
//            public int compare(String o1, String o2) {
//                if(t.indexOf(o1)> t.indexOf(o2)) {
//                    return 1;
//                }
//                if(t.indexOf(o1)< t.indexOf(o2)) {
//                    return -1;
//                }
//                return 0;
//            }
//        });

        Object[] arrKeys = sortKeysArray((Map)jsonObj,new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                if(t.indexOf(o1)> t.indexOf(o2)) {
                    return 1;
                }
                if(t.indexOf(o1)< t.indexOf(o2)) {
                    return -1;
                }
                return 0;
            }
        });

        Map<String, Object> rs = newMap();
        for (int i = 0; i < arrKeys.length; i++) {
            Object v = jsonObj.get(arrKeys[i]);
            if(v instanceof Map) {
                int key = txt.indexOf((String)arrKeys[i]);
                int  index1 = txt.indexOf("{", key);
                int  index2 = txt.indexOf("}", index1);
                v = newMap(txt.substring(index1,index2+1),false);
            }
            rs.put((String)arrKeys[i], v);
        }
        return (Map)rs;
    }

    /**
     * @param map
     * @param comparator
     * @return
     */
    public static  <K, V> Map<K,V> sort(Map<K,V> map,Comparator<K> comparator){
        Map<K, V> rs = newMap();
        K[] arrKeys = sortKeysArray(map,comparator);
        for (K k : arrKeys) {
            rs.put(k, map.get(k));
        }
        return rs;
    }

    /**
     * @param map
     * @param comparator
     * @return Object[] 不能用K[] 来接收
     */
    @SuppressWarnings("unchecked")
    public  static <K, V> K[] sortKeysArray(Map<K,V> map,Comparator<K> comparator) {
        Set<K> keys = map.keySet();
        K[] arr = (K[])(new Object[keys.size()]);
        K[] arrKeys = keys.toArray(arr);
        Arrays.sort(arrKeys,comparator);
        return arr;
    }
    /**
     * @param map
     * @param comparator
     * @return
     */
    public  static <K, V> Set<K> sortKeysSet(Map<K,V> map,Comparator<K> comparator) {
        return new TreeSet<>(sortKeysList(map,comparator));
    }

    /**
     * @param map
     * @param comparator
     * @return
     */
    public  static <K, V> List<K> sortKeysList(Map<K,V> map,Comparator<K> comparator) {
        K[] keys = sortKeysArray(map,comparator);
        return Arrays.asList(keys);
    }
}