以下是Java实现的树序列化与反序列化代码，支持二叉树结构：

class TreeNode {

    int val;

    TreeNode left;

    TreeNode right;

    TreeNode(int x) { val = x; }

}

 java.util.LinkedList;

import java.util.Queue;

public class TreeSerializer {

    // 序列化为层次遍历字符串

    public String serialize(TreeNode root) {

        if (root == null) return "null";

        Queue queue = new LinkedList<>();

        StringBuilder sb = new StringBuilder();

        queue.offer(root);

        

        while (!queue.isEmpty()) {

            TreeNode node = queue.poll();

            if (node == null) {

                sb.append("null,");

                continue;

            }

            sb.append(node.val).append(",");

            queue.offer(node.left);

            queue.offer(node.right);

        }

        return sb.toString();

    }

    // 反序列化层次遍历字符串

    public TreeNode deserialize(String data) {

        if (data.equals("null")) return null;

        String[] nodes = data.split(",");

        Queue queue = new LinkedList<>();

        TreeNode root = new TreeNode(Integer.parseInt(nodes[0]));

        queue.offer(root);

        

        for (int i = 1; i < nodes.length; i++) {

            TreeNode parent = queue.poll();

            if (!nodes[i].equals("null")) {

                parent.left = new TreeNode(Integer.parseInt(nodes[i]));

                queue.offer(parent.left);

            }

            if (++i < nodes.length && !nodes[i].equals("null")) {

                parent.right = new TreeNode(Integer.parseInt(nodes[i]));

                queue.offer(parent.right);

            }

        }

        return root;

    }

}

public class Main {

    public static void main(String[] args) {

        TreeNode root = new TreeNode(1);

        root.left = new TreeNode(2);

        root.right = new TreeNode(3);

        root.right.left = new TreeNode(4);

        root.right.right = new TreeNode(5);

        TreeSerializer serializer = new TreeSerializer();

        String serialized = serializer.serialize(root);

        System.out.println("序列化结果: " + serialized);

        

        TreeNode deserialized = serializer.deserialize(serialized);

        System.out.println("反序列化验证: " + 

            serializer.serialize(deserialized));

    }

}

该实现使用层次遍历（BFS）进行序列化，可以处理任意二叉树结构。序列化格式示例："1,2,3,null,null,4,5,null,null,null,null"。测试用例展示了完整的序列化-反序列化流程验证。

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