RMI网络编程: 如何搭建基于JDK1.5的分布式JAVA RMI

1. 在Eclipse里面创建一个server 端的project。然后，创建一个接口，这个接口是你要向client端开放的方法定义。它叫做：UserManagerInterface，而且必须继承Remote接口。

 1 package dataserver.rmi.stub;
 2
 3 import java.rmi.Remote;
 4 import java.rmi.RemoteException;
 5
 6 import dataserver.rmi.bean.Account;
 7
 8 public interface UserManagerInterface extends Remote{
 9     public String getUserName() throws RemoteException;
10     public Account getAdminAccount() throws RemoteException;
11 } 

2. 为了证明RMI中，“面向对象”或者是“无缝传递JAVA Object”是何等简单，我们需要定义一个Account类，该类是一个Bean，必须实现implements Serializable序列化接口。这是一个可以在client和server传输的可序列化对象。

package dataserver.rmi.bean; 

import java.io.Serializable; 

public class Account implements Serializable,Cloneable{ 

    /**
     *
     */
    private static final long serialVersionUID = -1858518369668584532L;
    private String username;
    private String password; 

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    } 

} 

3. 此时，需要实现你已经开放的接口：

package dataserver.rmi; 

import java.rmi.RemoteException; 

import dataserver.rmi.bean.Account;
import dataserver.rmi.stub.UserManagerInterface; 

public class UserManagerImpl implements UserManagerInterface { 

    public UserManagerImpl() throws RemoteException {
        //super();
        // TODO Auto-generated constructor stub
        //UnicastRemoteObject.exportObject(this);
    } 

    /**
     *
     */
    private static final long serialVersionUID = -3111492742628447261L; 

    public String getUserName() throws RemoteException {
        // TODO Auto-generated method stub
        return "Tommy Lee";
    } 

    public Account getAdminAccount() throws RemoteException {
        // TODO Auto-generated method stub
        Account account=new Account();
        account.setUsername("admin");
        account.setPassword("admin");
        return account;
    } 

} 

4. 定义一个主程序入口，注册你已经实现的RMI接口，包括开放端口等。其实很简单：

把我们的接口名称，命名为“userManager”,方便client进行调用

 1 package dataserver.entry;
 2
 3 import java.rmi.AlreadyBoundException;
 4 import java.rmi.RemoteException;
 5 import java.rmi.registry.LocateRegistry;
 6 import java.rmi.registry.Registry;
 7 import java.rmi.server.UnicastRemoteObject;
 8
 9 import dataserver.rmi.UserManagerImpl;
10 import dataserver.rmi.stub.UserManagerInterface;
11
12 public class Entry {
13
14     public static void main(String []args) throws AlreadyBoundException, RemoteException{
15
16
17             UserManagerImpl userManager=new UserManagerImpl();
18             UserManagerInterface userManagerI=(UserManagerInterface)UnicastRemoteObject.exportObject(userManager,0);
19             // Bind the remote object‘s stub in the registry
20             Registry registry = LocateRegistry.createRegistry(2001);
21             registry.rebind("userManager", userManagerI);
22             System.out.println("server is ready");
23     }
24 } 

5. Server端的代码已经全部写完，但是还要把bean类（Account）和接口类（UserMangerInterface）打包成jar，以便可以在下面导入进client端的项目中。

项目--》右键--》导出--》jar--》选择bean和interface--》命名为RmiServerInterface.jar--》finish

6.  开始创建client端的程序。新建一个project。创建完成后，把刚才jar包导入进client的项目中。

7.  导入我们的接口jar以后，可以开始编写一个client端的主程序，并调用server端的方法。

 1 package weiblog.rmi;
 2 import java.rmi.NotBoundException;
 3 import java.rmi.RemoteException;
 4 import java.rmi.registry.LocateRegistry;
 5 import java.rmi.registry.Registry;
 6
 7 import dataserver.rmi.stub.UserManagerInterface;
 8
 9 public class Entry2 {
10
11     public static void main(String []args){
12
13         try {
14             Registry registry = LocateRegistry.getRegistry("localhost",2001);
15             UserManagerInterface userManager = (UserManagerInterface) registry.lookup("userManager");
16             System.out.println(""+userManager.getAdminAccount().getUsername()
17                     +userManager.getAdminAccount().getPassword());
18         } catch (RemoteException e) {
19             // TODO Auto-generated catch block
20             e.printStackTrace();
21         } catch (NotBoundException e) {
22             // TODO Auto-generated catch block
23             e.printStackTrace();
24         }
25
26     }
27 } 

8. 启动server端的主程序，然后启动client端的主程序。

server控制台打印：server is ready

client控制台打印：adminadmin

可以参考：http://www.cnblogs.com/end/archive/2012/11/16/2772812.html