command校验的实现方式 - 全参构造器，重写Builder

最新推荐文章于 2025-06-24 19:04:06 发布

yanggfann

最新推荐文章于 2025-06-24 19:04:06 发布

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本文探讨了两种实现Command校验的方法：一是利用全参构造器进行参数校验，二是通过重写Builder模式并在构建过程中加入校验逻辑。这两种方式能有效确保Command对象的正确性。

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Command校验

@Builder
public class StudentCommand {
	private long id;
	private String name;
	private String description;
}

通过new的方式实现

@Builder
public class StudentCommand {
	private long id;
	private String name;
	private String description;

	public static StudentCommand of (long id, String name, String description) {
		if (description.length() > 100) {
			throw new Exception();
		}
		return new StudentCommand(id, name, description)
	}
}

@Builder
public class StudentCommand {
	private long id;
	private String name;
	private String description;

	public static StudentCommand of (long id, String name, String description) {
		if (description.length() > 100) {
			throw new Exception();
		}
		return StudentCommand.builder()
					.id(id)
					.name(name)
					.description(description)
					.build()
	}
}

重写Build，加入校验

@Builder
public class StudentCommand {
	private long id;
	private String name;
	private String description;

	public static class StudentCommandBuilder {
		public StudentCommand.StudentCommandBuilder description (String des) {
			if (des.length() > 100) {
				throw new Exception();
			}
			this.description = des;
			return this;
		} 
	}
}