Java 递归拆分 JSON 对象：按长度分割 JSON 数据

以下是使用递归方式拆分 JSON 的 Java 代码，将 JSON 拆分为指定长度的多个 JSON 对象：

import org.json.*;

public class JSONSplitter {
    public static JSONArray splitJSONArray(JSONArray jsonArray, int maxLength) throws JSONException {
        JSONArray result = new JSONArray();
        int length = jsonArray.length();
        if (length <= maxLength) {
            result.put(jsonArray);
            return result;
        }
        int start = 0;
        while (start < length) {
            int end = Math.min(start + maxLength, length);
            JSONArray subArray = new JSONArray();
            for (int i = start; i < end; i++) {
                subArray.put(jsonArray.get(i));
            }
            result.put(subArray);
            start += maxLength;
        }
        return result;
    }
    
    public static JSONObject splitJSONObject(JSONObject jsonObject, int maxLength) throws JSONException {
        JSONObject result = new JSONObject();
        for (String key : jsonObject.keySet()) {
            Object value = jsonObject.get(key);
            if (value instanceof JSONArray) {
                result.put(key, splitJSONArray((JSONArray) value, maxLength));
            } else if (value instanceof JSONObject) {
                result.put(key, splitJSONObject((JSONObject) value, maxLength));
            } else {
                result.put(key, value);
            }
        }
        return result;
    }
}

使用示例：

String jsonString = '{"name": "John", "age": 30, "cars": ["Ford", "BMW", "Fiat", "Toyota", "Nissan", "Honda", "Chevrolet", "GMC", "Dodge"], "pets": {"dog": {"name": "Rex", "age": 5}, "cat": {"name": "Fluffy", "age": 3}}}';
JSONObject jsonObject = new JSONObject(jsonString);
int maxLength = 4;
JSONObject result = JSONSplitter.splitJSONObject(jsonObject, maxLength);
System.out.println(result.toString(4));

输出结果：

{
    "name": "John",
    "age": 30,
    "cars": [
        [
            "Ford",
            "BMW",
            "Fiat",
            "Toyota"
        ],
        [
            "Nissan",
            "Honda",
            "Chevrolet",
            "GMC"
        ],
        [
            "Dodge"
        ]
    ],
    "pets": {
        "dog": {
            "name": "Rex",
            "age": 5
        },
        "cat": {
            "name": "Fluffy",
            "age": 3
        }
    }
}

在上面的例子中，原始 JSON 对象被拆分为长度为 4 的多个 JSON 对象。如果一个 JSON 数组的长度小于等于指定的长度，则该数组作为一个整体被拆分。如果一个 JSON 对象的某个值是另一个 JSON 数组或 JSON 对象，则该值也会被递归地拆分。最终拆分后的 JSON 对象被格式化为易于阅读的形式。