小编Nal*_*chu的帖子

我是DDD 领域驱动开发实施的新手。我从网上查看了一些项目源代码，他们使用 DDD 模式实现了这些源代码。在项目结构中，我发现了DTO以及Commands。我需要了解这两者之间有什么区别？这不是代码重复吗？

下面是项目中存在的两个 DTO 和 Command 示例类。

public class BookCargoCommand {
    private String bookingId;
    private int bookingAmount;
    private String originLocation;
    private String destLocation;
    private Date destArrivalDeadline;

    public BookCargoCommand(){}

    public BookCargoCommand(int bookingAmount,
                            String originLocation, String destLocation, Date destArrivalDeadline){

        this.bookingAmount = bookingAmount;
        this.originLocation = originLocation;
        this.destLocation = destLocation;
        this.destArrivalDeadline = destArrivalDeadline;
    }

    public void setBookingId(String bookingId){ this.bookingId = bookingId; }

    public String getBookingId(){return this.bookingId;}
    public void setBookingAmount(int bookingAmount){
        this.bookingAmount = bookingAmount;
    }


    public int getBookingAmount(){
        return this.bookingAmount;
    }


    public …