activatablermiclientframe.java

java网络编程 包含全书所有代码编程以及实例

package activatablermi;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.net.*;

public class activatableRMIClientFrame extends JFrame {
  private JPanel contentPane;
  private Button button1 = new Button();
  private Label label1 = new Label();

  //Construct the frame
  public activatableRMIClientFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();       //设计布局
    button1.setLabel("连接主机");
    button1.setBounds(new Rectangle(128, 183, 96, 29));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    contentPane.setLayout(null);
    this.setSize(new Dimension(352, 262));
    this.setTitle("可激活RMI客户端");
    label1.setBounds(new Rectangle(124, 110, 147, 25));
    contentPane.add(button1, null);
    contentPane.add(label1, null);
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }

  void button1_actionPerformed(ActionEvent e) {
    String serverName = "";
    System.setSecurityManager(new RMISecurityManager());      //建立安全管理器
    try {
      label1.setText("正在连接RMI主机...");
      serverName = InetAddress.getLocalHost().getHostName();   //得到RMI服务器端的主机名
      activatableRMI myHello = (activatableRMI)Naming.lookup("//" + serverName + "/HelloWorld");  //寻找RMI主机的相应服务
      String d = myHello.sayHello();            //调用远程函数
      label1.setText(d);                        //显示结果
    }
    catch(Exception e1) {
      System.out.println("Error: " + e1);       //捕捉异常情况
    }
  }
}