以下是使用不同语言实现JSON响应API的解决方法，包含了代码示例：

1. Python:

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/api/data', methods=['GET'])
def get_data():
    data = {
        'id': 1,
        'name': 'John Doe',
        'age': 25
    }
    return jsonify(data)

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

2. Java (使用Spring Boot):

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@SpringBootApplication
public class ApiApplication {

    public static void main(String[] args) {
        SpringApplication.run(ApiApplication.class, args);
    }

    @GetMapping("/api/data")
    public Data getData() {
        Data data = new Data(1, "John Doe", 25);
        return data;
    }

    public static class Data {
        private int id;
        private String name;
        private int age;

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

        // getters and setters
    }
}

3. JavaScript (使用Express.js):

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

app.get('/api/data', (req, res) => {
    const data = {
        id: 1,
        name: 'John Doe',
        age: 25
    };
    res.json(data);
});

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

4. Ruby (使用Ruby on Rails):

class ApiController < ApplicationController
  def data
    data = {
      id: 1,
      name: 'John Doe',
      age: 25
    }
    render json: data
  end
end

以上示例展示了在不同语言中实现JSON响应API的一些常见方法。请注意，代码示例可能需要根据具体的应用程序和框架进行调整。