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通过TreeMap 和冒泡算法对JSON 进行排序

排序实现所用依赖

主要使用的是阿里的fastjson。 commons-lang3 为工具类，里面包含String, 集合，日期等各种工具类

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.11</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.74</version>
        </dependency>

排序实现逻辑

排序主要从两块入手，分别是JSONObject, JSONArray.

对JSONObject进行排序

对JSONObject排序，选择使用TreeMap, 因为TreeMap的底层继承实现了NavigableMap接口，保证了TreeMap的有序性，

排序规则采用的是Comparator.naturalOrder()

具体逻辑实现：

 1     public static void sortJSONbyTreeMap(JSONObject payload){
 2         TreeMap<String, Object> treeMap = new TreeMap<>(Comparator.naturalOrder());
 3         for (Map.Entry<String, Object> entry : payload.entrySet()) {
 4             treeMap.put(entry.getKey(), entry.getValue());
 5         }
 6         for (Map.Entry<String, Object> entry : treeMap.entrySet()) {
 7             payload.remove(entry.getKey());
 8             payload.put(entry.getKey(), entry.getValue());
 9         }
10     }

对JSONArray进行排序

排序算法选择的是冒泡排序，比较实现主要从三种类型考虑，分别为Comparable, JSONObject以及JSONArray.

当类型不同的数据比较时

采用Comparable > JSONObject > JSONArray的顺序进行排序，具体实现：

 1     private final static ArrayList OBJ_TYPE_LIST = new ArrayList();
 2 
 3     static {
 4         OBJ_TYPE_LIST.add(Comparable.class.getSimpleName());
 5         OBJ_TYPE_LIST.add(JSONObject.class.getSimpleName());
 6         OBJ_TYPE_LIST.add(JSONArray.class.getSimpleName());
 7     }
 8 
 9     public static CompareResult compareObjectType(String objTypeA, String objTypeB) {
10         Integer indexA = OBJ_TYPE_LIST.indexOf(objTypeA);
11         Integer indexB = OBJ_TYPE_LIST.indexOf(objTypeB);
12         if (indexA.compareTo(indexB) > 0) {
13             return CompareResult.GREATER;
14         } else if (indexA.compareTo(indexB) == 0) {
15             return CompareResult.EQUAL;
16         } else {
17             return CompareResult.LESS;
18         }
19     }

当类型相同时，则分别使用不同的比较逻辑实现

1. 类型为Comparable的具体实现：

 1 public static CompareResult compareObject(Object objA, Object objB) {
 2         String objTypeA = classifyObjectType(objA);
 3         String objTypeB = classifyObjectType(objB);
 4         CompareResult compareResult = compareObjectType(objTypeA, objTypeB);
 5         if (compareResult == CompareResult.EQUAL) {
 6             if (StringUtils.equals(objTypeA, JSONObject.class.getSimpleName())) {
 7                 compareResult = compareJSONObject(((JSONObject) objA), ((JSONObject) objB));
 8             } else if (StringUtils.equals(objTypeA, JSONArray.class.getSimpleName())) {
 9                 compareResult = compareJSONArray(((JSONArray) objA), ((JSONArray) objB));
10             } else {
11                 if (((Comparable) objA).compareTo(objB) > 0) {
12                     compareResult = CompareResult.GREATER;
13                 } else if (((Comparable) objA).compareTo(objB) == 0) {
14                     compareResult = CompareResult.EQUAL;
15                 } else {
16                     compareResult = CompareResult.LESS;
17                 }
18             }
19         }
20         return compareResult;
21     }

2. 类型为JSONObject的具体实现：

 1     public static CompareResult compareJSONObject(JSONObject jsonObjectA, JSONObject jsonObjectB) {
 2         CompareResult compareResult = CompareResult.LESS;
 3         if (jsonObjectA.size() > jsonObjectB.size()) {
 4             compareResult = CompareResult.GREATER;
 5         } else if (jsonObjectB.size() < jsonObjectB.size()) {
 6             compareResult = CompareResult.LESS;
 7         } else {
 8             //When jsonObjectB.size() == jsonObjectB.size()
 9             Iterator<Map.Entry<String, Object>> iteratorA = jsonObjectA.entrySet().iterator();
10             Iterator<Map.Entry<String, Object>> iteratorB = jsonObjectB.entrySet().iterator();
11             while (iteratorA.hasNext()) {
12                 Map.Entry<String, Object> entryA = iteratorA.next();
13                 Map.Entry<String, Object> entryB = iteratorB.next();
14 
15                 //Compare key
16                 compareResult = compareObject(entryA.getKey(), entryB.getKey());
17                 if (compareResult != CompareResult.EQUAL) {
18                     break;
19                 }
20 
21                 //Compare the type of value
22                 compareResult = compareObjectType(classifyObjectType(entryA.getValue()), classifyObjectType(entryB.getValue()));
23                 if (compareResult != CompareResult.EQUAL) {
24                     break;
25                 }
26 
27                 //Compare value
28                 compareResult = compareObject(entryA.getValue(), entryB.getValue());
29                 if (compareResult != CompareResult.EQUAL) {
30                     break;
31                 }
32             }
33         }
34         return compareResult;
35     }

3. 类型为JSONArray的具体实现：

 1   public static CompareResult compareJSONArray(JSONArray jsonArrayA, JSONArray jsonArrayB) {
 2         CompareResult compareResult = CompareResult.LESS;
 3         if (jsonArrayA.size() > jsonArrayB.size()) {
 4             compareResult = CompareResult.GREATER;
 5         } else if (jsonArrayA.size() < jsonArrayB.size()) {
 6             compareResult = CompareResult.LESS;
 7         } else {
 8             //when jsonArrayA.size() == jsonArrayB.size()
 9             //Compare key
10             compareResult = compareObjectType(classifyObjectType(jsonArrayA.get(0)), classifyObjectType(jsonArrayB.get(0)));
11             if (compareResult == CompareResult.EQUAL) {
12                 ListIterator<Object> listIteratorA = jsonArrayA.listIterator();
13                 ListIterator<Object> listIteratorB = jsonArrayB.listIterator();
14                 while (listIteratorA.hasNext()) {
15                     //Compare value
16                     compareResult = compareObject(listIteratorA.next(), listIteratorB.next());
17                     if (compareResult != CompareResult.EQUAL) {
18                         break;
19                     }
20                 }
21             }
22         }
23         return compareResult;
24     }

测试代码

 1 package cn.sille.inns;
 2 
 3 import com.alibaba.fastjson.JSON;
 4 import org.junit.jupiter.api.Test;
 5 
 6 public class JSONSortUtilTest {
 7 
 8     @Test
 9     public void test(){
10         String sample1 = "{"aa":"1231","waa":"3453","err":{"123113":{"llll":[5,1,3,2],"rrrr":"12311df","gdddf":{"vvsss":[{"qwrq":"222","aaaa":"uuuu"},{"qwrq":"444","aaaa":"342342"},{"qwrq":"234","aaaa":"tttt"}]}}},"uuuu":[{"yyyy":1231,"iiiii":"uuuu","9999":{"sssss":"ppppp"}},{"hjhj":999,"opop":"uuuu"}]}";
11         String sample2 = "{"aa":"1231","err":{"123113":{"llll":[5,1,3,2],"rrrr":"12311df","gdddf":{"vvsss":[,{"qwrq":"234","aaaa":"tttt"},{"qwrq":"222","aaaa":"uuuu"},{"qwrq":"444","aaaa":"342342"}]}}},"uuuu":[{"hjhj":999,"opop":"uuuu"},{"iiiii":"uuuu","yyyy":1231,"9999":{"sssss":"ppppp"}}],"waa":"3453"}";
12 
13         System.out.println("=====================================================");
14         System.out.println(JSONSortUtil.sortJSONObject(JSON.parseObject(sample1)));
15         System.out.println("=====================================================");
16         System.out.println(JSONSortUtil.sortJSONObject(JSON.parseObject(sample2)));
17         System.out.println("=====================================================");
18 
19     }
20 }

排序实现

  1 package cn.sille.inns;
  2 
  3 import com.alibaba.fastjson.JSONArray;
  4 import com.alibaba.fastjson.JSONObject;
  5 import org.apache.commons.lang3.StringUtils;
  6 
  7 import java.util.*;
  8 
  9 public class JSONSortUtil {
 10     private final static ArrayList OBJ_TYPE_LIST = new ArrayList();
 11 
 12     static {
 13         OBJ_TYPE_LIST.add(Comparable.class.getSimpleName());
 14         OBJ_TYPE_LIST.add(JSONObject.class.getSimpleName());
 15         OBJ_TYPE_LIST.add(JSONArray.class.getSimpleName());
 16     }
 17 
 18     public enum CompareResult {
 19         GREATER, EQUAL, LESS
 20     }
 21 
 22     public static JSONObject sortJSONObject(JSONObject payload) {
 23         sortJSONbyTreeMap(payload);
 24         Iterator<String> iterator = payload.keySet().iterator();
 25         while (iterator.hasNext()) {
 26             Object value = payload.get(iterator.next());
 27             if (value instanceof JSONObject) {
 28                 sortJSONObject((JSONObject) value);
 29             } else if (value instanceof JSONArray) {
 30                 sortJSONArray((JSONArray) value);
 31             }
 32         }
 33         return payload;
 34     }
 35 
 36     public static void sortJSONArray(JSONArray payload) {
 37         sortJSONArrayBybubbleSort(payload);
 38         ListIterator<Object> iterator = payload.listIterator();
 39         while (iterator.hasNext()) {
 40             Object value = iterator.next();
 41             if (value instanceof JSONObject) {
 42                 sortJSONObject((JSONObject) value);
 43             } else if (value instanceof JSONArray) {
 44                 sortJSONArray((JSONArray) value);
 45             }
 46         }
 47     }
 48 
 49     public static String classifyObjectType(Object obj) {
 50         if (obj instanceof JSONObject) {
 51             return JSONObject.class.getSimpleName();
 52         } else if (obj instanceof JSONArray) {
 53             return JSONArray.class.getSimpleName();
 54         } else {
 55             return Comparable.class.getSimpleName();
 56         }
 57     }
 58 
 59     public static CompareResult compareObjectType(String objTypeA, String objTypeB) {
 60         Integer indexA = OBJ_TYPE_LIST.indexOf(objTypeA);
 61         Integer indexB = OBJ_TYPE_LIST.indexOf(objTypeB);
 62         if (indexA.compareTo(indexB) > 0) {
 63             return CompareResult.GREATER;
 64         } else if (indexA.compareTo(indexB) == 0) {
 65             return CompareResult.EQUAL;
 66         } else {
 67             return CompareResult.LESS;
 68         }
 69     }
 70 
 71     public static void sortJSONbyTreeMap(JSONObject payload){
 72         TreeMap<String, Object> treeMap = new TreeMap<>(Comparator.naturalOrder());
 73         for (Map.Entry<String, Object> entry : payload.entrySet()) {
 74             treeMap.put(entry.getKey(), entry.getValue());
 75         }
 76         for (Map.Entry<String, Object> entry : treeMap.entrySet()) {
 77             payload.remove(entry.getKey());
 78             payload.put(entry.getKey(), entry.getValue());
 79         }
 80     }
 81 
 82     public static void sortJSONArrayBybubbleSort(JSONArray payload) {
 83         if (!payload.isEmpty()) {
 84             for (int i = payload.size() - 1; i > 0; i--) {
 85                 for (int j = 0; j < i; j++) {
 86                     Object objA = payload.get(j);
 87                     Object objB = payload.get(j + 1);
 88                     CompareResult compareResult = compareObject(objA, objB);
 89                     if (compareResult == CompareResult.GREATER) {
 90                         payload.remove(objA);
 91                         payload.add(j, objB);
 92                         payload.remove(objB);
 93                         payload.add(j + 1, objA);
 94                     }
 95                 }
 96             }
 97         }
 98     }
 99 
100     public static CompareResult compareObject(Object objA, Object objB) {
101         String objTypeA = classifyObjectType(objA);
102         String objTypeB = classifyObjectType(objB);
103         CompareResult compareResult = compareObjectType(objTypeA, objTypeB);
104         if (compareResult == CompareResult.EQUAL) {
105             if (StringUtils.equals(objTypeA, JSONObject.class.getSimpleName())) {
106                 compareResult = compareJSONObject(((JSONObject) objA), ((JSONObject) objB));
107             } else if (StringUtils.equals(objTypeA, JSONArray.class.getSimpleName())) {
108                 compareResult = compareJSONArray(((JSONArray) objA), ((JSONArray) objB));
109             } else {
110                 if (((Comparable) objA).compareTo(objB) > 0) {
111                     compareResult = CompareResult.GREATER;
112                 } else if (((Comparable) objA).compareTo(objB) == 0) {
113                     compareResult = CompareResult.EQUAL;
114                 } else {
115                     compareResult = CompareResult.LESS;
116                 }
117             }
118         }
119         return compareResult;
120     }
121 
122     public static CompareResult compareJSONObject(JSONObject jsonObjectA, JSONObject jsonObjectB) {
123         CompareResult compareResult = CompareResult.LESS;
124         if (jsonObjectA.size() > jsonObjectB.size()) {
125             compareResult = CompareResult.GREATER;
126         } else if (jsonObjectB.size() < jsonObjectB.size()) {
127             compareResult = CompareResult.LESS;
128         } else {
129             //When jsonObjectB.size() == jsonObjectB.size()
130             Iterator<Map.Entry<String, Object>> iteratorA = jsonObjectA.entrySet().iterator();
131             Iterator<Map.Entry<String, Object>> iteratorB = jsonObjectB.entrySet().iterator();
132             while (iteratorA.hasNext()) {
133                 Map.Entry<String, Object> entryA = iteratorA.next();
134                 Map.Entry<String, Object> entryB = iteratorB.next();
135 
136                 //Compare key
137                 compareResult = compareObject(entryA.getKey(), entryB.getKey());
138                 if (compareResult != CompareResult.EQUAL) {
139                     break;
140                 }
141 
142                 //Compare the type of value
143                 compareResult = compareObjectType(classifyObjectType(entryA.getValue()), classifyObjectType(entryB.getValue()));
144                 if (compareResult != CompareResult.EQUAL) {
145                     break;
146                 }
147 
148                 //Compare value
149                 compareResult = compareObject(entryA.getValue(), entryB.getValue());
150                 if (compareResult != CompareResult.EQUAL) {
151                     break;
152                 }
153             }
154         }
155         return compareResult;
156     }
157 
158     public static CompareResult compareJSONArray(JSONArray jsonArrayA, JSONArray jsonArrayB) {
159         CompareResult compareResult = CompareResult.LESS;
160         if (jsonArrayA.size() > jsonArrayB.size()) {
161             compareResult = CompareResult.GREATER;
162         } else if (jsonArrayA.size() < jsonArrayB.size()) {
163             compareResult = CompareResult.LESS;
164         } else {
165             //when jsonArrayA.size() == jsonArrayB.size()
166             //Compare key
167             compareResult = compareObjectType(classifyObjectType(jsonArrayA.get(0)), classifyObjectType(jsonArrayB.get(0)));
168             if (compareResult == CompareResult.EQUAL) {
169                 ListIterator<Object> listIteratorA = jsonArrayA.listIterator();
170                 ListIterator<Object> listIteratorB = jsonArrayB.listIterator();
171                 while (listIteratorA.hasNext()) {
172                     //Compare value
173                     compareResult = compareObject(listIteratorA.next(), listIteratorB.next());
174                     if (compareResult != CompareResult.EQUAL) {
175                         break;
176                     }
177                 }
178             }
179         }
180         return compareResult;
181     }
182 }

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原文地址：https://www.cnblogs.com/sille/p/13904961.html