最近我再次开始使用 Java,但我对 RMI 很执着。我已经设法让它与一个无效的函数一起工作,但它似乎无法通过网络返回一个字符串。
有谁知道我做错了什么?
主.java:
package RMI;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.Random;
public class Main extends UnicastRemoteObject implements Main_Interface {
private Random random;
private boolean coin = false;
public Main() throws RemoteException { ; }
public String flipCoin() throws RemoteException {
coin = random.nextBoolean();
if(coin) {
System.out.println("Throwing Head");
return "Head";
} else {
System.out.println("Throwing Tail");
return "Tail";
}
}
public void test() throws RemoteException {
System.out.println("Test succesful");
}
}
Main_Interface.java:
package RMI;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Main_Interface extends Remote {
String flipCoin() throws RemoteException;
void test() throws RemoteException;
}
Client.java(从不重要的代码中剥离):
package Client;
import RMI.Main_Interface;
import java.io.*;
import java.net.InetAddress;
import java.rmi.Naming;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class Client {
public static void main(String[] args) {
String line = null;
boolean coin = false;
Main_Interface conn = null;
try {
String location = InetAddress.getLocalHost().getHostName();
Registry myRegistry = LocateRegistry.getRegistry(location, 1099);
conn = (Main_Interface) myRegistry.lookup("ISA");
//conn = (Main_Interface) Naming.lookup("ISA");
} catch (Exception e) {
System.out.println("Server could not be found at "+location);
System.exit(0);
}
try {
conn.test()
System.out.println("Here");
if(conn.flipCoin().equals("Head")){
System.out.println("Succes");
}
System.out.println("Here");
if(coin) {
System.out.println("Throwed Head");
} else {
System.out.println("Throwed Tail");
}
} catch (Exception e) {
System.out.println("Could not execute the command...");
}
}
}
正如您可能猜到的,test() 函数将完美执行,但 flipCoin() 函数将抛出异常。