[英]Port already in use exception with java RMI using CMD
使用 java 和 CMD 运行 RMI。 显示 java.rmi.server.ExportException。 例外是,端口已在使用中。
服务器接口
import java.rmi.*;
public interface AdditionInterface extends Remote {
public int add(int a, int b) throws RemoteException;
}
接口实现
import java.rmi.Naming;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class AdditionClient {
public static void main(String[] args) {
try {
String host="";
Registry registry = LocateRegistry.getRegistry(host);
AdditionInterface hello = (AdditionInterface) registry.lookup("Addition");
int result = hello.add(9, 2);
System.out.println("Result is: " + result);
} catch (Exception ex) {
System.out.println("HelloClient Exception" + ex);
}
}
}
服务器注册表 class
package chapter40;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class AdditionServer {
public static void main(String[] args) {
try {
Registry registry = LocateRegistry.getRegistry();
AdditionInterface obj = new Addition();
registry.rebind("Addition", obj);
System.out.println("Addition Server is ready");
} catch (Exception ex) {
System.out.println("Addition Server failed" + ex);
}
}
}
客户端程序
import java.rmi.Naming;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class AdditionClient {
public static void main(String[] args) {
try {
String host="";
Registry registry = LocateRegistry.getRegistry(host);
AdditionInterface hello = (AdditionInterface) registry.lookup("Addition");
int result = hello.add(9, 2);
System.out.println("Result is: " + result);
} catch (Exception ex) {
System.out.println("HelloClient Exception" + ex);
}
}
}
为了清楚起见,我在两个不同的项目中将服务器与客户端类分开
我搜索了各种线程,最后让它以不同于[但也是我所看到的组合]的方式工作
运行服务器程序(从命令提示符):
将目录更改为服务器的源文件夹cd c:\Users\Heavenly\workspace\RMIServerSide\src
编译类javac chapter40/*.java
启动 RMI 注册表start rmiregistry
启动包含 main() 方法的注册表服务器 class。 注意代码行略有不同
start java -cp. chapter40.AdditionServer
start java -cp. chapter40.AdditionServer
(服务器已经设置好了)
运行客户端程序
将目录更改为源文件夹cd c:\Users\Heavenly\workspace\RMIClientSide\src
编译所有类javac chapter40/*.java
3.运行客户端程序java chapter40.AdditionClient
(现在一切都在运行)
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