如何在我的JSON response API中添加total (int)字段

const express = require('express');
const app = express();

app.get('/api/data', (req, res) => {
    const data = [
        { id: 1, name: 'Item 1' },
        { id: 2, name: 'Item 2' }
    ];
    const total = data.length;

    res.json({ total, data });
});

app.listen(3000, () => {
    console.log('Server is running on port 3000');
});

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/api/data')
def get_data():
    data = [
        {'id': 1, 'name': 'Item 1'},
        {'id': 2, 'name': 'Item 2'}
    ]
    total = len(data)
    return jsonify({'total': total, 'data': data})

if __name__ == '__main__':
    app.run(port=3000)

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController
public class DataController {

    @GetMapping("/api/data")
    public DataResponse getData() {
        List<Item> data = new ArrayList<>();
        data.add(new Item(1, "Item 1"));
        data.add(new Item(2, "Item 2"));

        int total = data.size();
        return new DataResponse(total, data);
    }

    static class DataResponse {
        private int total;
        private List<Item> data;

        public DataResponse(int total, List<Item> data) {
            this.total = total;
            this.data = data;
        }

        // Getters and setters
    }

    static class Item {
        private int id;
        private String name;

        public Item(int id, String name) {
            this.id = id;
            this.name = name;
        }

        // Getters and setters
    }
}