如何在RMI方法中传递参数中的对象?
问题描述:
我想在RMI方法中添加参数。当我添加例如String
一切工作正常。但我不确定是否可以传递我创建的对象。我是新来的RMI所以我的代码非常简单:如何在RMI方法中传递参数中的对象?
HelloIF
public interface HelloIF extends Remote {
String greeting(Context c) throws RemoteException;
}
你好
public class Hello extends UnicastRemoteObject implements HelloIF {
public Hello() throws RemoteException {
}
public String greeting(Context c) throws RemoteException {
addToContext(c);
report(c);
return "greeting";
}
void addToContext(Context c) {
c.addID(Thread.currentThread().getId());
}
void report(Context c) {
System.out.println("Hello.greeting() thread : "
+ Thread.currentThread().getName() + " "
+ Thread.currentThread().getId());
System.out.println("Hello.greeting() context : "
+ c.getDistributedThreadName() + " " + c.getRequestType());
}
}
的RMIServer
public class RMIServer {
public static void main(String[] args) throws RemoteException, MalformedURLException {
LocateRegistry.createRegistry(1099);
HelloIF hello = new Hello();
Naming.rebind("server.Hello", hello);
System.out.println("server.RMI Server is ready.");
System.out.println("RMIServer.main() thread : " + Thread.currentThread().getName()
+ " " + Thread.currentThread().getId());
}
}
RMIClient
public class RMIClient {
public static void main(String[] args) throws RemoteException, MalformedURLException, NotBoundException {
Context context = new Context("request1", Thread.currentThread().getName()+System.currentTimeMillis());
Registry registry = LocateRegistry.getRegistry("localhost");
HelloIF hello = (HelloIF) registry.lookup("server.Hello");
System.out.println(hello.greeting(context));
System.out.println("RMIClient.mian() thread : " + Thread.currentThread().getName()
+ " " + Thread.currentThread().getId());
}
}
最后我班语境
public class Context
{
private String requestType;
private String distributedThreadName;
private List<Long> IDList;
(...) getters/setters
}
我应该怎么做才能让传递上下文的可能吗?
答
你的对象应该实现Serializable
。正如我所见,这将是一个问题。这是需要的,因为两个部分之间的通信是使用序列化完成的,所以需要将每个对象发送到另一个部分,需要成为实现Serializable
的类的实例。
public class Context implements Serializable
{
private String requestType;
private String distributedThreadName;
private List<Long> IDList;
(...) getters/setters
}
请加上serialVersionUID
作为一个良好的做法。喜欢的东西:
private static final long serialVersionUID = 20120731125400L;
这里是按引用传递参数的方式: http://*.com/questions/11187548/is-it-possible-to-pass-by-reference-in-rmi – dz00dz 2017-03-08 22:09:34