java实现两个json的深度对比
两个json的深度对比
在网上找了好多资料都没有找到想要的，还是自己写个吧！
上代码！！！
1.pom.xml中加入
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.62</version> </dependency>
2.新建CompareJson.java类
package com.suncompass.huanjinyingji.uitl; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.serializer.SerializerFeature; import java.util.*; public class CompareJson { private static final String SysRoot = "sys_root"; private static final String SysType = "sys_type"; private static final String SysObj = "sys_obj"; private static final String SysNew = "sys_new"; private static final String SysOld = "sys_old"; private static final String TypeNew = "new"; private static final String TypeDelete = "delete"; private static final String TypeDifference = "difference"; private String itemKey; private List<String> ignoreKeys = new ArrayList<>(); public CompareJson(String itemKey) { this.itemKey = itemKey; } public CompareJson(String itemKey, String ignoreKeys) { this.itemKey = itemKey; this.ignoreKeys = Arrays.asList(ignoreKeys.split("\\,")); } public static void main(String[] args) { final String json1 = "{\"id\":\"1\",\"name\":\"n1\",\"height\":null,\"list\":[1,2,3],\"age\":0,\"items\":[{\"id\":\"11\",\"name\":\"n11\",\"copyId\":\"1\"},{\"id\":\"12\",\"name\":\"n12\",\"copyId\":\"2\"}]}"; final String json2 = "{\"id\":\"1\",\"name\":\"n2\",\"height\":180,\"list\":[3,4,5],\"age\":null,\"items\":[{\"id\":\"11\",\"name\":\"n11\",\"copyId\":\"3\"},{\"id\":\"12\",\"name\":\"n13\",\"copyId\":\"2\"}]}"; String resultStr = new CompareJson("copyId").compareJson(json1, json2); System.out.println(resultStr); } private void compareJson(JSONObject jsonObject1, JSONObject jsonObject2, Map<String, Object> objectMap) { Iterator<String> iterator = jsonObject1.keySet().iterator(); while (iterator.hasNext()) { String key = iterator.next(); if (ignoreKeys.contains(key)) { continue; } Object value1 = jsonObject1.get(key); Object value2 = jsonObject2.get(key); compareJson(key, value1, value2, objectMap); } } private void compareJson(JSONArray jsonArray1, JSONArray jsonArray2, List<Map<String, Object>> arrayMap) { JSONArray jsonArray = (JSONArray) jsonArray1.clone(); if (jsonArray2 != null) { jsonArray.addAll(jsonArray2); } for (int i = 0; i < jsonArray.size(); i++) { JSONObject jsonObject = (JSONObject) jsonArray.get(i); Object keyValue = jsonObject.get(this.itemKey); if (keyValue == null) { continue; } JSONObject jsonObject1 = null; for (int j = 0; j < jsonArray1.size(); j++) { JSONObject jsonObj = (JSONObject) jsonArray1.get(j); if (keyValue.equals(jsonObj.get(this.itemKey))) { jsonObject1 = jsonObj; break; } } JSONObject jsonObject2 = null; for (int j = 0; j < jsonArray2.size(); j++) { JSONObject jsonObj = (JSONObject) jsonArray2.get(j); if (keyValue.equals(jsonObj.get(this.itemKey))) { jsonObject2 = jsonObj; break; } } Map<String, Object> objectMap = new HashMap<>(); if (jsonObject1 != null && jsonObject2 == null) { objectMap.put(this.itemKey, keyValue); objectMap.put(SysType, TypeNew); objectMap.put(SysObj, jsonObject1); } else if (jsonObject1 == null && jsonObject2 != null) { objectMap.put(this.itemKey, keyValue); objectMap.put(SysType, TypeDelete); objectMap.put(SysObj, jsonObject2); } else { Map<String, Object> differenceMap = new HashMap<>(); compareJson(jsonObject1, jsonObject2, differenceMap); if (differenceMap.size() > 0) { objectMap.put(this.itemKey, keyValue); objectMap.put(SysType, TypeDifference); objectMap.put(SysObj, differenceMap); } } if (objectMap.size() > 0) { Map<String, Object> findMap = null; for (Map<String, Object> map : arrayMap) { if (keyValue.equals(map.get(this.itemKey))) { findMap = map; break; } } if (findMap == null) { arrayMap.add(objectMap); } } } } private void compareJson(String key, Object json1, Object json2, Map<String, Object> resultMap) { if (json1 instanceof JSONObject) { Map<String, Object> objectMap = new HashMap<>(); compareJson((JSONObject) json1, (JSONObject) json2, objectMap); if (objectMap.size() > 0) { resultMap.put(key, objectMap); } } else if (json1 instanceof JSONArray) { JSONArray jsonArray = (JSONArray) json1; if (jsonArray != null && jsonArray.size() > 0) { if (!(jsonArray.get(0) instanceof JSONObject)) { //["1","2"],[1,2]... Map<String, Object> compareMap = new HashMap<>(); compareMap.put(SysNew, json1); compareMap.put(SysOld, json2); resultMap.put(key, compareMap); return; } } List<Map<String, Object>> arrayMap = new ArrayList<>(); compareJson((JSONArray) json1, (JSONArray) json2, arrayMap); if (arrayMap.size() > 0) { resultMap.put(key, arrayMap); } } else if ((json1 == null && json2 != null) || (json1 != null && !json1.equals(json2))) { Map<String, Object> compareMap = new HashMap<>(); compareMap.put(SysNew, json1); compareMap.put(SysOld, json2); resultMap.put(key, compareMap); } } public String compareJson(String json1, String json2) { Object jsonObj1 = JSONObject.parse(json1); Object jsonObj2 = JSONObject.parse(json2); Map<String, Object> resultMap = new HashMap<>(); compareJson(SysRoot, jsonObj1, jsonObj2, resultMap); String resultStr = JSON.toJSONString(resultMap.get(SysRoot), new SerializerFeature[]{SerializerFeature.WriteMapNullValue}); return resultStr; } }
3.运行main函数输出
{ "name": { "sys_new": "n1", "sys_old": "n2" }, "list": { "sys_new": [1, 2, 3], "sys_old": [3, 4, 5] }, "items": [{ "copyId": "1", "sys_type": "new", "sys_obj": { "copyId": "1", "name": "n11", "id": "11" } }, { "copyId": "2", "sys_type": "difference", "sys_obj": { "name": { "sys_new": "n12", "sys_old": "n13" } } }, { "copyId": "3", "sys_type": "delete", "sys_obj": { "copyId": "3", "name": "n11", "id": "11" } }], "age": { "sys_new": 0, "sys_old": null }, "height": { "sys_new": null, "sys_old": 180 } }
总结：
1.支持深度；
2.支持集合指定标识设置（itemKey）；
3.支持数组（如：[1,2,3]）；
4.去除重复；
5.支持排除键设置（ignoreKeys）；