java/project/ExportCommand.java

package com.example.moviecli.command;

import com.example.moviecli.model.Movie;
import com.example.moviecli.repository.MovieRepository;
import com.example.moviecli.view.ConsoleView;
import com.example.moviecli.exception.SaveFailedException;
import com.opencsv.CSVWriter;
import java.io.FileWriter;
import java.util.List;

public class ExportCommand implements Command {
    private final ConsoleView view;

    public ExportCommand(ConsoleView view) {
        this.view = view;
    }

    @Override
    public String getName() {
        return "export";
    }

    @Override
    public void execute(String[] args, MovieRepository repository) {
        List<Movie> movies = repository.getAll();
        if (movies.isEmpty()) {
            view.printError("没有数据可导出。");
            return;
        }
        try (CSVWriter writer = new CSVWriter(new FileWriter("movies.csv"))) {
            String[] header = {"Rank", "Title", "OriginalTitle", "Score", "Year", "Director"};
            writer.writeNext(header);
            for (Movie m : movies) {
                String[] line = {
                    String.valueOf(m.getRank()),
                    m.getTitle(),
                    m.getOriginalTitle(),
                    m.getScore(),
                    m.getYear(),
                    m.getDirector()
                };
                writer.writeNext(line);
            }
            view.printSuccess("导出成功：movies.csv");
        } catch (Exception e) {
            // 使用自定义异常包装原始异常
            SaveFailedException ex = new SaveFailedException("导出CSV文件失败", e);
            view.printError(ex.getMessage());
            ex.printStackTrace();  // 打印堆栈，体现使用了自定义异常
        }
    }
}