java rmi 应用_Java RMI图形界面应用程序

在上一章中，我们创建了一个RMI应用程序的示例。 在本章中，我们将介绍如何创建一个客户端调用显示GUI窗口(基于JavaFX)的RMI应用程序。

定义远程接口

在这里，首先定义一个名称为Hello的远程接口，此接口中有一个名称为animation()的方法。

import java.rmi.Remote;

import java.rmi.RemoteException;

// Creating Remote interface for our application

public interface Hello extends Remote {

void animation() throws RemoteException;

}

开发实现类

在本应用程序的Implementation类(远程对象)中，将创建一个使用JavaFX显示GUI内容的窗口。创建一个Java源代码文件：FxSample.java，其代码如下所示 -

import javafx.animation.RotateTransition;

import javafx.application.Application;

import javafx.event.EventHandler;

import javafx.scene.Group;

import javafx.scene.PerspectiveCamera;

import javafx.scene.Scene;

import javafx.scene.control.TextField;

import javafx.scene.input.KeyEvent;

import javafx.scene.paint.Color;

import javafx.scene.paint.PhongMaterial;

import javafx.scene.shape.Box;

import javafx.scene.text.Font;

import javafx.scene.text.FontWeight;

import javafx.scene.text.Text;

import javafx.scene.transform.Rotate;

import javafx.stage.Stage;

import javafx.util.Duration;

// Implementing the remote interface

public class FxSample extends Application implements Hello {

@Override

public void start(Stage stage) {

// Drawing a Box

Box box = new Box();

// Setting the properties of the Box

box.setWidth(150.0);

box.setHeight(150.0);

box.setDepth(100.0);

// Setting the position of the box

box.setTranslateX(350);

box.setTranslateY(150);

box.setTranslateZ(50);

// Setting the text

Text text = new Text(

"Type any letter to rotate the box, and click on the box to stop the rotation");

// Setting the font of the text

text.setFont(Font.font(null, FontWeight.BOLD, 15));

// Setting the color of the text

text.setFill(Color.CRIMSON);

// Setting the position of the text

text.setX(20);

text.setY(50);

// Setting the material of the box

PhongMaterial material = new PhongMaterial();

material.setDiffuseColor(Color.DARKSLATEBLUE);

// Setting the diffuse color material to box

box.setMaterial(material);

// Setting the rotation animation to the box

RotateTransition rotateTransition = new RotateTransition();

// Setting the duration for the transition

rotateTransition.setDuration(Duration.millis(1000));

// Setting the node for the transition

rotateTransition.setNode(box);

// Setting the axis of the rotation

rotateTransition.setAxis(Rotate.Y_AXIS);

// Setting the angle of the rotation

rotateTransition.setByAngle(360);

// Setting the cycle count for the transition

rotateTransition.setCycleCount(50);

// Setting auto reverse value to false

rotateTransition.setAutoReverse(false);

// Creating a text filed

TextField textField = new TextField();

// Setting the position of the text field

textField.setLayoutX(50);

textField.setLayoutY(100);

// Handling the key typed event

EventHandler eventHandlerTextField = new EventHandler() {

@Override

public void handle(KeyEvent event) {

// Playing the animation

rotateTransition.play();

}

};

// Adding an event handler to the text feld

textField.addEventHandler(KeyEvent.KEY_TYPED, eventHandlerTextField);

// Handling the mouse clicked event(on box)

EventHandler eventHandlerBox =

new EventHandler() {

@Override

public void handle(javafx.scene.input.MouseEvent e) {

rotateTransition.stop();

}

};

// Adding the event handler to the box

box.addEventHandler(javafx.scene.input.MouseEvent.MOUSE_CLICKED, eventHandlerBox);

// Creating a Group object

Group root = new Group(box, textField, text);

// Creating a scene object

Scene scene = new Scene(root, 600, 300);

// Setting camera

PerspectiveCamera camera = new PerspectiveCamera(false);

camera.setTranslateX(0);

camera.setTranslateY(0);

camera.setTranslateZ(0);

scene.setCamera(camera);

// Setting title to the Stage

stage.setTitle("Event Handlers Example");

// Adding scene to the stage

stage.setScene(scene);

// Displaying the contents of the stage

stage.show();

}

// Implementing the interface method

public void animation() {

launch();

}

}

服务器程序

RMI服务器程序应实现远程接口或扩展实现类。 在这里，应该创建一个远程对象并将其绑定到RMIregistry。

以下是本应用程序的服务器程序。在这里，我们将扩展上述创建的类，创建一个远程对象，并使用绑定名称：hello 将其注册到RMI注册表。创建一个Java源代码文件：Server.java，其代码如下所示 -

import java.rmi.registry.Registry;

import java.rmi.registry.LocateRegistry;

import java.rmi.RemoteException;

import java.rmi.server.UnicastRemoteObject;

public class Server extends FxSample {

public Server() {}

public static void main(String args[]) {

try {

// Instantiating the implementation class

FxSample obj = new FxSample();

// Exporting the object of implementation class

// (here we are exporting the remote object to the stub)

Hello stub = (Hello) UnicastRemoteObject.exportObject(obj, 0);

// Binding the remote object (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();

}

}

}

客户端程序

以下是本应用程序的客户端程序。 在这里，我们提取远程对象并调用其animation()方法。创建一个Java源代码文件：Client.java，其代码如下所示 -

import java.rmi.registry.LocateRegistry;

import java.rmi.registry.Registry;

public class Client {

private Client() {}

public static void main(String[] args) {

try {

// Getting the registry

Registry registry = LocateRegistry.getRegistry(null);

// Looking up the registry for the remote object

Hello stub = (Hello) registry.lookup("Hello");

// Calling the remote method using the obtained object

stub.animation();

System.out.println("Remote method invoked");

} catch (Exception e) {

System.err.println("Client exception: " + e.toString());

e.printStackTrace();

}

}

}

运行示例的步骤

以下是运行RMI示例的步骤。

第一步 - 打开存储所有程序的文件夹，并编译所有Java文件，如下所示。

F:\worksp\java_rmi\java-gui>javac *.java

F:\worksp\java_rmi\java-gui>

第二步 - 使用以下命令启动rmi注册表。

start rmiregistry

这将在单独的窗口中启动一个rmi注册表，如下所示。

第三步 - 运行服务器类文件，如下所示。

F:\worksp\java_rmi\java-gui>java Server

Server ready

第四步 - 运行客户端类文件，如下所示。

F:\worksp\java_rmi\java-gui> java Client

验证调用结果 - 当启动客户端以后，将在服务器中看到启动一个图形界面，如下所示 -

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