Java：从文件数据动态实例化对象的教程

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class ObjectCreator {

    public static void main(String[] args) {
        String filePath = "data.txt"; // 假设文件名为data.txt
        List<Object> createdObjects = new ArrayList<>();

        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = reader.readLine()) != null) {
                String[] parts = line.split(","); // 分割字符串

                // 确保至少有足够的字段
                if (parts.length >= 3) {
                    // 打印解析结果以供调试
                    System.out.println("解析行: " + line);
                    System.out.println("类型: " + parts[0].trim());
                    System.out.println("名称/ID: " + parts[1].trim());
                    System.out.println("描述: " + parts[2].trim());

                    // 调用方法创建对象
                    Object obj = createObjectFromParts(parts);
                    if (obj != null) {
                        createdObjects.add(obj);
                    }
                } else {
                    System.err.println("跳过无效行 (字段不足): " + line);
                }
            }
        } catch (IOException e) {
            System.err.println("读取文件时发生错误: " + e.getMessage());
            e.printStackTrace();
        }

        // 打印所有创建的对象
        System.out.println("\n--- 创建的对象列表 ---");
        for (Object obj : createdObjects) {
            System.out.println(obj);
        }
    }

    // ... createObjectFromParts 方法将在下一节实现
    private static Object createObjectFromParts(String[] parts) {
        // 此处将实现对象的动态创建逻辑
        return null; 
    }
}

// Room.java
public class Room {
    private String name;
    private String description;

    public Room(String name, String description) {
        this.name = name;
        this.description = description;
    }

    public String getName() {
        return name;
    }

    public String getDescription() {
        return description;
    }

    @Override
    public String toString() {
        return "Room [name=" + name + ", description=" + description + "]";
    }
}

// 添加到 ObjectCreator 类中
private static Object createObjectFromParts(String[] parts) {
    String type = parts[0].trim();
    String name = parts[1].trim();
    String description = parts[2].trim();

    switch (type) {
        case "Room":
            // 根据解析出的数据创建 Room 对象
            return new Room(name, description);
        // 如果未来有其他类型的对象，可以在这里添加更多的 case
        // case "Staircase":
        //     return new Staircase(name, description);
        default:
            System.err.println("未知对象类型: " + type + ", 无法创建对象。");
            return null;
    }
}

Room,home,You are in your home
Room,kitchen,This is a cozy kitchen

解析行: Room,home,You are in your home
类型: Room
名称/ID: home
描述: You are in your home
解析行: Room,kitchen,This is a cozy kitchen
类型: Room
名称/ID: kitchen
描述: This is a cozy kitchen

--- 创建的对象列表 ---
Room [name=home, description=You are in your home]
Room [name=kitchen, description=This is a cozy kitchen]