Question

我无法理解如何使用代码库。

我有以下结构：

CLIENT:
Client.java
client.policy

SERVER:
Server.java
Hello.java
HelloInterfaces.java

HelloInterfaces.java

public interface HelloInterfaces extends Remote {
}

Hello.java

public class Hello extends UnicastRemoteObject implements HelloInterfaces{

    public Hello() throws RemoteException{
    }

}

Server.java

public class Server {

    public static void main(String[] arg) throws RemoteException {
        Registry reg = LocateRegistry.createRegistry(1099);
        reg.rebind("Hello", new Hello());
        System.out.println("Ready");
    }
}

Client.java

public class Client {

    public static void main(String[] args) throws RemoteException, NotBoundException, MalformedURLException {
  String host="192.168.1.227";  //IP SERVER
        System.setProperty("java.rmi.server.codebase", "http://" + host + ":8080");
        System.setProperty("java.security.policy", "client.policy");
        System.setSecurityManager(new RMISecurityManager());
        Registry reg = LocateRegistry.getRegistry(host);
        System.out.println("Regitry Found!");
        System.out.println(reg.list().length);
        System.out.println(reg.list()[0]);
        HelloInterfaces h;
        h = (HelloInterfaces) reg.lookup("Hello");
        System.out.println(h);
    }
}

client.policy

grant {
permission java.security.AllPermission;
};

直接从Netbeans在服务器（使用Linux的虚拟机）上执行：输出服务器：准备就绪！

在客户端上，我使用选项--classpath .:Server.jar编译源代码（其中Server.jar包含HelloInterfaces.class）。

执行客户端：

  Output Client:
  Registry Found!
  1
  Hello
  (Running......)

两分钟后：

Exception in thread "main" java.rmi.UnmarshalException: error unmarshalling return; nested exception is: 
    java.lang.ClassNotFoundException: HelloInterfaces
    at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
    at Client.main(Client.java:36)
Caused by: java.lang.ClassNotFoundException: HelloInterfaces
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.rmi.server.LoaderHandler$Loader.loadClass(LoaderHandler.java:1206)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:270)
    at sun.rmi.server.LoaderHandler.loadClassForName(LoaderHandler.java:1219)
    at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:729)
    at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:673)
    at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:610)
    at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:646)
    at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:311)
    at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:255)
    at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1558)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1514)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
    ... 2 more

此外，在包含.class的目录服务器上，我在端口8080上运行python httpserver。（与NanoHTTP相同的结果，用java编写的http服务器）

app客户端与http服务器联系，因为python httpserver输出：

192.168.1.24 - -  "GET / HTTP/1.1" 200 -

Answer 1

代码库是包含.class文件的包结构化层次结构的JAR文件或目录的URL列表。主机和端口专用URL似乎不太可能符合该描述。

- RMI代码库不起作用 - Registry Lookup非常慢并且不起作用

1 个答案: