请教一个RMI的问题

garlic11 2002-02-26 10:08:01

我根据某材料上的例子学习RMI，可是每当我先运行start rmiregistry，然后再用
java -Djava.security.policy=policy.txt FileServer
运行Server程序的时候（policy.txt的内容是：
grant {
permission java.security.AllPermission "", "";
};），报错：
FileServer: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve)
java.security.AccessControlException: access denied (java.net.SocketPermission 127.0.0.1:1099 connect,resolve)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:272)
at java.security.AccessController.checkPermission(AccessController.java:399)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1044)
at java.net.Socket.<init>(Socket.java:262)
at java.net.Socket.<init>(Socket.java:100)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:25)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:120)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:499)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:190)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:174)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:318)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Naming.java:160)
at FileServer.main(FileServer.java:11)

源代码如下：
FileInterface.java

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface FileInterface extends Remote {
public byte[] downloadFile(String fileName) throws
RemoteException;
}

FileImpl.java

import java.io.*;
import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;

public class FileImpl extends UnicastRemoteObject
implements FileInterface {

private String name;

public FileImpl(String s) throws RemoteException{
super();
name = s;
}

public byte[] downloadFile(String fileName){
try {
File file = new File(fileName);
byte buffer[] = new byte[(int)file.length()];
BufferedInputStream input = new
BufferedInputStream(new FileInputStream(fileName));
input.read(buffer,0,buffer.length);
input.close();
return(buffer);
} catch(Exception e){
System.out.println("FileImpl: "+e.getMessage());
e.printStackTrace();
return(null);
}
}
}

FileServer.java

import java.io.*;
import java.rmi.*;

public class FileServer {
public static void main(String argv[]) {
if(System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
}
try {
FileInterface fi = new FileImpl("FileServer");
Naming.rebind("//127.0.0.1/FileServer", fi);
} catch(Exception e) {
System.out.println("FileServer: "+e.getMessage());
e.printStackTrace();
}
}
}

FileClient.java

import java.io.*;
import java.rmi.*;

public class FileClient{
public static void main(String argv[]) {
if(argv.length != 2) {
System.out.println("Usage: java FileClient fileName machineName");
System.exit(0);
}
try {
String name = "//" + argv[1] + "/FileServer";
FileInterface fi = (FileInterface) Naming.lookup(name);
byte[] filedata = fi.downloadFile(argv[0]);
File file = new File(argv[0]);
BufferedOutputStream output = new
BufferedOutputStream(new FileOutputStream(file.getName()));
output.write(filedata,0,filedata.length);
output.flush();
output.close();
} catch(Exception e) {
System.err.println("FileServer exception: "+ e.getMessage());
e.printStackTrace();
}
}
}

请有经验的大侠不吝赐教，谢谢

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