JSON数据比对工具类-优快云博客

本文介绍了一个用于比较两个JSON对象差异的Java工具类。该类可以递归地比较JSON对象、数组和字符串，报告不一致的键及其对应的值。

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package com.util;

import java.util.Iterator;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
 * json数据比对工具类
 */
public class JsonUtil {

	@SuppressWarnings("unchecked")
	public static String compareJson(JSONObject json1, JSONObject json2, String key) {
		StringBuffer sBuffer = new StringBuffer();
		String jsonString = "";
		Iterator<String> i = json1.keySet().iterator();
		while (i.hasNext()) {
			key = i.next();
			jsonString = compareJson(json1.get(key), json2.get(key), key);
			sBuffer.append(jsonString);
		}
		return sBuffer.toString();
	}

	public static String compareJson(Object json1, Object json2, String key) {
		String jsonString = "";
		if (json1 instanceof JSONObject) {
			jsonString = compareJson((JSONObject) json1, (JSONObject) json2, key);
		} else if (json1 instanceof JSONArray) {
			jsonString = compareJson((JSONArray) json1, (JSONArray) json2, key);
		} else if (json1 instanceof String) {
			try {
				String json1ToStr = json1.toString();
				String json2ToStr = json2.toString();
				jsonString = compareJson(json1ToStr, json2ToStr, key);
			} catch (Exception e) {
				System.out.println("转换发生异常 key:" + key);
				e.printStackTrace();
			}
		} else {
			jsonString = compareJson(json1.toString(), json2.toString(), key);
		}
		return jsonString;
	}

	public static String compareJson(String str1, String str2, String key) {
		StringBuffer sBuffer = new StringBuffer();
		if (!str1.equals(str2)) {
			sBuffer.append("不一致key【" + key + "】,json1:【" + str1 + "】,json2:【" + str2 +"】\n");
//			System.err.println("不一致key:" + key + ",json1:" + str1 + ",json2:" + str2);
		}
		return sBuffer.toString();
	}

	@SuppressWarnings("rawtypes")
	public static String compareJson(JSONArray json1, JSONArray json2, String key) {
		StringBuffer sBuffer = new StringBuffer();
		if (json1 != null && json2 != null) {
			Iterator i1 = json1.iterator();
			Iterator i2 = json2.iterator();
			while (i1.hasNext()) {
				compareJson(i1.next(), i2.next(), key);
			}
		} else {
			if (json1 == null && json2 == null) {
				sBuffer.append("不一致：key:" + key + "  在json1和json2中均不存在 \n");
//				System.err.println("不一致：key:" + key + "  在json1和json2中均不存在");
			} else if (json1 == null) {
				sBuffer.append("不一致：key:" + key + "  在json1中不存在 \n");
//				System.err.println("不一致：key:" + key + "  在json1中不存在");
			} else if (json2 == null) {
				sBuffer.append("不一致：key:" + key + "  在json2中不存在");
//				System.err.println("不一致：key:" + key + "  在json2中不存在");
			} else {
				sBuffer.append("不一致：key:" + key + "  未知原因");
//				System.err.println("不一致：key:" + key + "  未知原因");
			}
		}
		return sBuffer.toString();
	}

	private final static String st1 = "{\"username\":\"tom\",\"age\":18}";
	private final static String st2 = "{\"username\":\"tom\",\"age\":19}";

	public static void main(String[] args) {
		JSONObject jsonObject1 = JSONObject.fromObject(st1);
		JSONObject jsonObject2 = JSONObject.fromObject(st2);
		compareJson(jsonObject1, jsonObject2, null);
	}
}

参考原文：
https://blog.youkuaiyun.com/wangjin890620/article/details/81011461