helloclientframe.java

Java网络编程实例-第8章实例.rar

package hello;

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

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

  //Construct the frame
  public HelloClientFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    label1.setBounds(new Rectangle(95, 95, 197, 26));
    this.setBackground(SystemColor.inactiveCaption);
    this.setSize(new Dimension(313, 228));
    this.setTitle("RMI客户端");
    this.setLayout(null);
    button1.setLabel("连接主机");
    button1.setBounds(new Rectangle(105, 154, 86, 29));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    this.add(button1, null);
    this.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());          //建立一个安全管理器
    try
    {
      serverName = InetAddress.getLocalHost().getHostName();       //得到RMI服务器端的主机名
      label1.setText("正在连接RMI主机...");
      Hello myHello = (Hello)Naming.lookup("//" + serverName + "/HelloWorld");   //寻找RMI主机的相应服务
      String tmp = myHello.sayHello();                            //调用远程函数
      label1.setText(tmp);                                        //显示结果
    }
    catch (Exception e1)
    {
      System.out.println("Error: " + e1);                         //捕捉异常情况
    }

  }
}