[英]RMI Server Connection refused to host: ############ ; nested exception is: java.net.ConnectException: Connection refused: connect
[英]RMI(java.net.ConnectException: Connection refused: connect)
我正在嘗試運行名為SampleServer的服務器。 我正在使用Windows,這就是我所做的:
在cmd中:
javaw rmiregistry 1099
cd C:\Users\Home\workspace\RMI\src
java -Djava.security.policy=policy SampleServer 1099
我收到以下錯誤:
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
我嘗試使用不同的端口#,例如4719用於rmiregistry,但我收到相同的錯誤。 我確保我的防火牆已被禁用,但問題仍然存在。 我確保端口尚未使用。 我真的希望有人可以幫助我。
我的桌面圖片包含項目文件夾,eclipse窗口和cmd打開: http : //s22.postimg.org/uq00qzslr/picyture.png
碼:
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;
}
樣品:
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;
};
javaw rmiregistry 1099
停在那兒。 這已經錯了。 'rmiregistry'是一個可執行文件,而不是您可以使用'java'或'javaw'執行的Java類的名稱。 只需使用'rmiregistry'。
當您嘗試連接端口上沒有運行服務時,會發生此錯誤。 正如EJP所說, rmiregistry
是一個可以由rmiregistry &
后台啟動的工具(JDK 7)。 我建議您檢查端口的防火牆或連接問題。
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