如何将哈希图从byte[]转换回来？

import java.util.HashMap;
import com.fasterxml.jackson.databind.ObjectMapper;

public class HashGraphConverter {
    public static HashMap<String, Object> convertFromByteArray(byte[] bytes) {
        try {
            // 将byte[]转换为字符串
            String jsonString = new String(bytes, "UTF-8");

            // 使用Jackson库将字符串转换为HashMap
            ObjectMapper mapper = new ObjectMapper();
            HashMap<String, Object> hashGraph = mapper.readValue(jsonString, HashMap.class);

            return hashGraph;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        // 示例byte[]，实际应根据具体情况获取
        byte[] byteData = {123, 34, 107, 101, 121, 34, 58, 34, 118, 97, 108, 117, 101, 34, 125};

        // 将byte[]转换为哈希图
        HashMap<String, Object> hashGraph = convertFromByteArray(byteData);

        // 访问和操作哈希图中的键值对
        if (hashGraph != null) {
            System.out.println("Key: " + hashGraph.get("key"));
            System.out.println("Value: " + hashGraph.get("value"));
        }
    }
}