helloclientframe.java

java网络编程 包含全书所有代码编程以及实例

package rmisocket;

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


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

  //Construct the frame
  public helloClientFrame() {
    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(114, 181, 112, 33));
    button1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        button1_actionPerformed(e);
      }
    });
    contentPane.setLayout(null);
    this.setSize(new Dimension(338, 272));
    this.setTitle("RMI套接字客户机");
    label1.setBounds(new Rectangle(103, 102, 190, 32));
    contentPane.add(button1, null);
    contentPane.add(label1, null);
    RMISocketFactory.setSocketFactory(new RMISocketFoc());       //声明在此RMI远程调用中使用RMISocketFoc类型的通讯方法
  }
  //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 {
      label1.setText("正在连接RMI主机...");
      serverName = InetAddress.getLocalHost().getHostName();   //得到RMI服务器端的主机名
      Hello myHello = (Hello)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
    }
  }
}