正在使用的远程方法调用端口

Question

我已经使用RMI创建了Server，Client之类的程序。但是，每当从命令提示符启动rmiregistry后运行服务器时，都会抛出已在使用中的错误。是我唯一开始rmiregistry的人。我已经从netstat检查了它。

服务器代码：

public class Server implements Runnable, Linker{


private static Server server = null;
    private static Linker l = null;
    private String name = null;
    public Server(){}

    public void setName(String name){
        this.name = name;
    }
    public String getName(){
        return name;               
    }  
    public void run(){
        while(!("Andy").equalsIgnoreCase(name)){

        }
    }
    public static void createStub(){
        try{
            server = new Server();
            l = (Linker) UnicastRemoteObject.exportObject(server, 1099);

            Registry registry = LocateRegistry.getRegistry();
            registry.bind("Link", l);
            System.out.println("Ready");
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }                       
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        createStub();
        Thread t = new Thread(server);

    }
}

客户代码：

public class Client implements Runnable{


private Scanner sc = new Scanner(System.in);
    private Linker linker = null;

    public void loadStub(){
        try{
            Registry registry = LocateRegistry.getRegistry(1099);
            linker = (Linker) registry.lookup("Link");

        }catch(Exception e){

        }
    }
    public void run(){
        String ip = null;
        while(sc.hasNext()&&!(ip = sc.nextLine()).equalsIgnoreCase(":q")){
            try {
                linker.setName(ip);
            } catch (RemoteException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }


    public static void main(String...args){
        Client client = new Client();
        client.loadStub();
        Thread t = new Thread(client);
        t.start();
    }
}

例外：

java.rmi.server.ExportException: Port already in use: 1099; nested exception is: 
java.net.BindException: Address already in use: JVM_Bind

Answer 1

该rmiregistry在其过程中使用的端口1099，所以你不能在你使用它。要么：

1. 通过LocateRegistry.createRegistry()（首选）以相同的过程启动注册表。
2. 将对象导出到其他端口。
3. rmiregistry在1099以外的其他端口上启动。