ObjectOutputStream中的不同对象

时间:2013-06-01 19:37:56

标签: java java-io objectoutputstream

在ObjectOutputStream上发送自制对象时,该对象的服务器和客户端类是否必须相同?

例如,当一些Action只能在服务器上执行时,因为它只需要服务器上的其他几个类,客户端上的类可以与服务器上的类不同吗?

服务器类:

public class SomeAction implements Action, Serializable {

    private static final long serialVersionUID = 1L; //Just some serialVersionUID
    private String name;

    public SomeAction(String name) {
        //This property must be sent to the server
        this.name = name;

    }

    @Override
    public void performAction() {
        System.out.println("New client connected");
        Server.getConnections().add(1); //Increases the number of connections on the server. Of course, this is only available on the server.

        //Do something with the client
        . . .

    }

}

客户端类:

public class SomeAction implements Action, Serializable {

    private static final long serialVersionUID = 1L; //Just some serialVersionUID
    private String name;

    public SomeAction(String name) {
        //This property must be sent to the server
        this.name = name;

    }

    @Override
    public void performAction() {
        System.out.println("New client connected");
        //The getConnections().add(1) wont work on the client.

        //Do something with the client
        . . .

    }

}

现在客户端可以将其类发送到服务器,然后服务器是否会从自己的类中调用performAction()方法?

1 个答案:

答案 0 :(得分:1)

课程可以有所不同,但不会有太多不同。关于这些类之间的“兼容性”,有几条规则。

http://docs.oracle.com/javase/7/docs/platform/serialization/spec/serialTOC.html

例如,可以向类中添加新方法,并将serialVersionUID字段保持为相同的值,并且不要使用新方法 - 当然,这不会打扰。

更新

更好的链接:

http://web.archive.org/web/20051125013312/http://www.macchiato.com/columns/Durable4.html