详解Java 中 RMI 的使用

package com.wdbyte.rmi.server;

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



public interface UserService extends Remote {

    
    User findUser(String userId) throws RemoteException;
}

package com.wdbyte.rmi.server;

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


public class UserServiceImpl extends UnicastRemoteObject implements UserService {

    protected UserServiceImpl() throws RemoteException {
    }

    @Override
    public User findUser(String userId) throws RemoteException {
        // 加载在查询
         if ("00001".equals(userId)) {
            User user = new User();
            user.setName("金庸");
            user.setAge(100);
            user.setSkill("写作");
            return user;
        }
        throw new RemoteException("查无此人");
    }
}

package com.wdbyte.rmi.server;

import java.io.Serializable;


public class User implements Serializable {

    private static final long serialVersionUID = 6490921832856589236L;

    private String name;
    private Integer age;
    private String skill;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getSkill() {
        return skill;
    }

    public void setSkill(String skill) {
        this.skill = skill;
    }
    
    @Override
    public String toString() {
        return "User{" +
            "name='" + name + '\'' +
            ", age=" + age +
            ", skill='" + skill + '\'' +
            '}';
    }
}

package com.wdbyte.rmi.server;

import java.rmi.Naming;
import java.rmi.registry.LocateRegistry;


public class RmiServer {

    public static void main(String[] args) {
        try {
            UserService userService = new UserServiceImpl();
            LocateRegistry.createRegistry(1900);
            Naming.rebind("rmi://localhost:1900/user", userService);
            System.out.println("start server,port is 1900");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

package com.wdbyte.rmi.client;

import java.rmi.Naming;

import com.wdbyte.rmi.server.User;
import com.wdbyte.rmi.server.UserService;


public class RmiClient {
    public static void main(String args[]) {
        User answer;
        String userId = "00001";
        try {
            // lookup method to find reference of remote object
            UserService access = (UserService)Naming.lookup("rmi://localhost:1900/user");
            answer = access.findUser(userId);
            System.out.println("query:" + userId);
            System.out.println("result:" + answer);
        } catch (Exception ae) {
            System.out.println(ae);
        }
    }
}

start server,port is 1900

query:00001
result:User{name='金庸', age=100, skill='写作'}

java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: 
	java.rmi.RemoteException: 查无此人