Java Rmi getDate()程序在客户端出错
我第一次尝试编写RMI代码。该程序执行从服务器获取日期的非常简单的功能。我设法让服务器运行,但在客户端出现异常:Java Rmi getDate()程序在客户端出错,java,eclipse,rmi,Java,Eclipse,Rmi,我第一次尝试编写RMI代码。该程序执行从服务器获取日期的非常简单的功能。我设法让服务器运行,但在客户端出现异常: Exception in thread "main" java.rmi.NotBoundException: //localhost/RemoteDatum at sun.rmi.registry.RegistryImpl.lookup(RegistryImpl.java:166) at sun.rmi.registry.RegistryImpl_Skel.dispa
Exception in thread "main" java.rmi.NotBoundException: //localhost/RemoteDatum
at sun.rmi.registry.RegistryImpl.lookup(RegistryImpl.java:166)
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:410)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:268)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$254(TCPTransport.java:683)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$1/1287360293.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:379)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at MyClient.main(MyClient.java:15)
我的接口“RemoteDatum”如下所示:(我将服务器中的接口复制到客户机项目文件夹,存根由RMI eclipse插件生成)
RemoteDatumImpl:接口的实现
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.Date;
public class RemoteDatumImpl extends UnicastRemoteObject implements RemoteDatum {
protected RemoteDatumImpl() throws RemoteException {
super();
}
public Date holeDatum() throws RemoteException
{
return new Date();
}
}
服务器:
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
public class MyServer extends UnicastRemoteObject {
protected MyServer() throws RemoteException {
super();
}
public static void main(String[] args) throws RemoteException, MalformedURLException
{
try
{
String name = "RemoteDatum";
Registry r = LocateRegistry.getRegistry();
MyServer service = new MyServer();
r.rebind(name, service);
}catch(Exception ex){ex.printStackTrace();}
}
}
我的客户:
import java.net.MalformedURLException;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class MyClient {
public static void main(String[] args) throws RemoteException, MalformedURLException, NotBoundException
{
Registry r = LocateRegistry.getRegistry();
String name = "//localhost/RemoteDatum";
RemoteDatum service = (RemoteDatum) r.lookup(name);
System.out.println(service.holeDatum());
}
}
我正在使用EclipseRMI插件启动RMI注册表,不知道这是否相关。我正在使用Mac电脑。首先:
Registry r = LocateRegistry.getRegistry();
除非客户端与服务器在同一主机上运行,否则您需要获取服务器的注册表,
而不是您自己的注册表:
Registry r = LocateRegistry.getRegistry("serverhost);
然后:
如果使用的是注册表
界面,则不应在查找字符串中包含主机名。它应该是“RemoteDatum”
或者,如果使用命名
类,则应包括主机名:
RemoteDatum service = (RemoteDatum)Naming.lookup("//serverhost/RemoteDatum");
谢谢你的建议。我试了一点,还是不行。。我得到这个错误“未知主机”
String name = "//localhost/RemoteDatum";
RemoteDatum service = (RemoteDatum) r.lookup(name);
RemoteDatum service = (RemoteDatum)Naming.lookup("//serverhost/RemoteDatum");