一個簡單的HELLO程序

Hello.java:

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

public interface Hello extends Remote {
String sayHello() throws RemoteException;
}

Client.java:

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Client {

private Client() {}

public static void main(String[] args) {

String host = (args.length < 1) ? null : args[0];
try {
//注冊指定的主機,沒有指定就是本地主機
Registry registry = LocateRegistry.getRegistry(host);
//取得主機打開的服務接口
Hello stub = (Hello) registry.lookup("Hello");
String response = stub.sayHello();
System.out.println("response: " + response);
} catch (Exception e) {
System.err.println("Client exception: " + e.toString());
e.printStackTrace();
}
}
}

Server.java:

import java.rmi.registry.Registry;
import java.rmi.registry.LocateRegistry;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class Server implements Hello {

public Server() {}

public String sayHello() {
return "Hello, world!";
}

public static void main(String args[]) {

try {
Server obj = new Server();
Hello stub = (Hello) UnicastRemoteObject.exportObject(obj, 0);

// Bind the remote object's stub in the registry
Registry registry = LocateRegistry.getRegistry();
registry.bind("Hello", stub);

System.err.println("Server ready");
} catch (Exception e) {
System.err.println("Server exception: " + e.toString());
e.printStackTrace();
}
}
}

工作流程圖:

Hello的客戶端工作流程

<textbox style="mso-next-textbox: #_x0000_s1029"><font face="Times New Roman" size="3"></font></textbox><textbox style="mso-next-textbox: #_x0000_s1026"><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">注冊遠程服務器</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman" size="3">Registry registry=LocateRegistry.getRegistry();</font></span></p> </div> </td> </tr></tbody></table></textbox><textbox style="mso-next-textbox: #_x0000_s1027"><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">以字符串的形式獲得遠程服務器的服務</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman" size="3">Hello stub=(Hello)registry.lookup("Hello");</font></span></p> </div> </td> </tr></tbody></table></textbox><textbox style="mso-next-textbox: #_x0000_s1028"><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">用取得的服務去調用遠程服務器的方法</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman" size="3">String response=stub.sayHello();</font></span></p> </div> </td> </tr></tbody></table></textbox><stroke endarrow="block"><font face="Times New Roman" size="3"></font></stroke><stroke endarrow="block"><font face="Times New Roman" size="3"></font></stroke>

<shadow offset2="-6pt,-6pt" offset="-3pt,-3pt" color2="shadow add(102)" type="double"><font face="Times New Roman" size="3"></font></shadow>

<textbox style="mso-next-textbox: #_x0000_s1035"><font face="Times New Roman" size="3"></font></textbox><textbox style="mso-next-textbox: #_x0000_s1032"><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">使用</span><span lang="EN-US"><font face="Times New Roman">JRMP</font></span><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</span><span lang="EN-US"><font face="Times New Roman">Java </font></span><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">遠程方法協議）用于導出一個遠程對象，并且獲得一個與遠程對象通信的</span><span lang="EN-US"><font face="Times New Roman">stub</font></span></font></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman" size="3">Hello stub=(Hello)UnicastRemoteObject.exportObject(obj,0);</font></span></p> </div> </td> </tr></tbody></table></textbox><textbox style="mso-next-textbox: #_x0000_s1033"><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">注冊服務器</font></span></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman" size="3">Registry registry=LocateRegistry.getRegistry();</font></span></p> </div> </td> </tr></tbody></table></textbox><textbox style="mso-next-textbox: #_x0000_s1034"><table cellspacing="0" cellpadding="0" width="100%"><tbody><tr> <td style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent"> <div> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><font size="3"><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">將名字綁定到遠程通信的</span><span lang="EN-US"><font face="Times New Roman">stub</font></span><span style="FONT-FAMILY: 新細明體; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">上，并且注冊</span></font></p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman" size="3">registry.bind("Hello",stub);</font></span></p> </div> </td> </tr></tbody></table></textbox><stroke endarrow="block"><font face="Times New Roman" size="3"></font></stroke><stroke endarrow="block"><font face="Times New Roman" size="3"></font></stroke>

Hello的服務端工作流程