Question

我正在尝试运行名为SampleServer的服务器。我正在使用Windows，这就是我所做的：

在cmd中：

javaw rmiregistry 1099
cd C:\Users\Home\workspace\RMI\src
java -Djava.security.policy=policy SampleServer 1099

我收到以下错误：

binding //localhost:1099/Sample
New instance of Sample created
Sample server failed:Connection refused to host: localhost; nested exception is:

        java.net.ConnectException: Connection refused: connect

我尝试使用不同的端口＃，例如4719用于rmiregistry，但我收到同样的错误。我确保我的防火墙已被禁用，但问题仍然存在。我确保端口尚未使用。我真的希望有人可以帮助我。

我的桌面图片包含项目文件夹，eclipse窗口和cmd打开： http://s22.postimg.org/uq00qzslr/picyture.png

代码：

SampleServer：

import java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
import java.rmi.server.UnicastRemoteObject;

public class SampleServer {
    public static void main(String args[]) {
        if (args.length != 1) {
            System.err.println("usage: java SampleServer rmi_port");
            System.exit(1);
        }
        // Create and install a security manager
        if (System.getSecurityManager() == null)
            System.setSecurityManager(new RMISecurityManager());
        try {
            // first command-line argument is the port of the rmiregistry
            int port = Integer.parseInt(args[0]);
            String url = "//localhost:" + port + "/Sample";
            System.out.println("binding " + url);
            Naming.rebind(url, new Sample());
            // Naming.rebind("Sample", new Sample());
            System.out.println("server " + url + " is running...");
        }
        catch (Exception e) {
            System.out.println("Sample server failed:" + e.getMessage());
        }
    }
}

SampleClient：

import java.rmi.Naming;
import java.rmi.RemoteException;

public class SampleClient  {
    public static void main(String args[]) {
        try {
            if (args.length < 3) {
                System.err.println("usage: java SampleClient host port string... \n");
                System.exit(1);
            }

            int port = Integer.parseInt(args[1]);
            String url = "//" + args[0] + ":" + port + "/Sample";
            System.out.println("looking up " + url);

            SampleInterface sample = (SampleInterface)Naming.lookup(url);

            // args[2] onward are the strings we want to reverse
            for (int i=2; i < args.length; ++i)
                // call the remote method and print the return
                System.out.println(sample.invert(args[i]));
        } catch(Exception e) {
            System.out.println("SampleClient exception: " + e);
        }
    }
}

SampleInterface：

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

public interface SampleInterface extends Remote {
    public String invert(String msg) throws RemoteException;
}

样品：

import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.*;

// this is the class with remote methods

public class Sample
  extends UnicastRemoteObject
  implements SampleInterface {

    private int a;

    public Sample() throws RemoteException {
    System.out.println("New instance of Sample created");
    a = 1;
    }

    public String invert(String m) throws RemoteException {
        // return input message with characters reversed
        System.out.println("invert("+m+") a=" + a);
        return new StringBuffer(m).reverse().toString();
    }
}

政策：

grant {
    permission java.security.AllPermission;
};

Answer 1

javaw rmiregistry 1099

停在那儿。这已经错了。＆＃39; rmiregistry的＆＃39;是一个可执行文件，而不是您可以使用＆＃39; java＆＃39;执行的Java类的名称。或者＆＃39; javaw＆＃39;。只需使用＆＃39; rmiregistry＆＃39;。

Answer 2

当您尝试连接端口上没有运行服务时，会发生此错误。正如EJP所说，rmiregistry是一个可以在后台由rmiregistry &启动的工具（JDK 7）。我建议您检查端口的防火墙或连接问题。

RMI（java.net.ConnectException：连接被拒绝：连接）

2 个答案: