计算机网络第五次作业

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编写一个GUI程序实现ping功能

一、GUI程序界面

用MyEclipse中Java模块有一个WindowBuilder模块，用WindowBuilder设计GUI的界面，如下图所示：

二、源代码展示

1.实现ping功能的函数代码

2.实现JFrame窗口的完整代码：

public class Ping extends JFrame {

   private JPanel contentPane;
   private JTextField address_textField;
   private JTextArea textArea;

   /**
   * Launch the application.
   */
   public static void main(String[] args) {
       EventQueue.invokeLater(new Runnable() {
           public void run() {
               try {
                   Ping frame = new Ping();
                   frame.setVisible(true);
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       });
   }

   /**
   * Create the frame.
   */
   public Ping() {
       setIconImage(Toolkit.getDefaultToolkit().getImage("D:\\Java_code\\Ping\\images\\banana.png"));
       setTitle("Ping GUI");
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       setBounds(100, 100, 606, 414);
       contentPane = new JPanel();
       contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
       setContentPane(contentPane);

       JPanel panel = new JPanel();

       JPanel panel_1 = new JPanel();
       panel_1.setBorder(new TitledBorder(UIManager.getBorder("TitledBorder.border"), "Results", TitledBorder.LEFT, TitledBorder.TOP, null, new Color(0, 0, 0)));
       GroupLayout gl_contentPane = new GroupLayout(contentPane);
       gl_contentPane.setHorizontalGroup(
           gl_contentPane.createParallelGroup(Alignment.LEADING)
               .addComponent(panel, Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, 580, Short.MAX_VALUE)
               .addGroup(Alignment.TRAILING, gl_contentPane.createSequentialGroup()
                   .addContainerGap()
                   .addComponent(panel_1, GroupLayout.DEFAULT_SIZE, 580, Short.MAX_VALUE))
       );
       gl_contentPane.setVerticalGroup(
           gl_contentPane.createParallelGroup(Alignment.LEADING)
               .addGroup(gl_contentPane.createSequentialGroup()
                   .addComponent(panel, GroupLayout.PREFERRED_SIZE, 76, GroupLayout.PREFERRED_SIZE)
                   .addGap(18)
                   .addComponent(panel_1, GroupLayout.DEFAULT_SIZE, 280, Short.MAX_VALUE)
                   .addContainerGap())
       );

        textArea = new JTextArea();
        textArea.setFont(new Font("Monospaced", Font.PLAIN, 14));
       textArea.setBackground(SystemColor.control);
       textArea.setEditable(false);
       GroupLayout gl_panel_1 = new GroupLayout(panel_1);
       gl_panel_1.setHorizontalGroup(
           gl_panel_1.createParallelGroup(Alignment.LEADING)
               .addGroup(gl_panel_1.createSequentialGroup()
                   .addContainerGap()
                   .addComponent(textArea, GroupLayout.DEFAULT_SIZE, 538, Short.MAX_VALUE)
                   .addContainerGap())
       );
       gl_panel_1.setVerticalGroup(
           gl_panel_1.createParallelGroup(Alignment.LEADING)
               .addComponent(textArea, Alignment.TRAILING, GroupLayout.DEFAULT_SIZE, 238, Short.MAX_VALUE)
       );
       panel_1.setLayout(gl_panel_1);

       JLabel IP_AddressLabel = new JLabel("IP Address:");

       address_textField = new JTextField();
       address_textField.setText("127.0.0.1");
       address_textField.setColumns(10);

       JButton PingButton = new JButton("ping");
       PingButton.setFont(new Font("宋体", Font.PLAIN, 17));
       PingButton.addActionListener(new ActionListener() {
           public void actionPerformed(ActionEvent e) {
               pingAction(e);
           }
       });
       GroupLayout gl_panel = new GroupLayout(panel);
       gl_panel.setHorizontalGroup(
           gl_panel.createParallelGroup(Alignment.LEADING)
               .addGroup(gl_panel.createSequentialGroup()
                   .addGap(20)
                   .addComponent(IP_AddressLabel, GroupLayout.PREFERRED_SIZE, 75, GroupLayout.PREFERRED_SIZE)
                   .addPreferredGap(ComponentPlacement.RELATED)
                   .addComponent(address_textField, GroupLayout.PREFERRED_SIZE, 205, GroupLayout.PREFERRED_SIZE)
                   .addPreferredGap(ComponentPlacement.RELATED, 120, Short.MAX_VALUE)
                   .addComponent(PingButton)
                   .addGap(99))
       );
       gl_panel.setVerticalGroup(
           gl_panel.createParallelGroup(Alignment.LEADING)
               .addGroup(gl_panel.createSequentialGroup()
                   .addGap(34)
                   .addGroup(gl_panel.createParallelGroup(Alignment.BASELINE)
                       .addComponent(IP_AddressLabel, GroupLayout.PREFERRED_SIZE, 25, GroupLayout.PREFERRED_SIZE)
                       .addComponent(address_textField, GroupLayout.PREFERRED_SIZE, GroupLayout.DEFAULT_SIZE, GroupLayout.PREFERRED_SIZE)
                       .addComponent(PingButton))
                   .addContainerGap(17, Short.MAX_VALUE))
       );
       panel.setLayout(gl_panel);
       contentPane.setLayout(gl_contentPane);

       //设置窗体居中
        this.setLocationRelativeTo(null);
   }

   private void pingAction(ActionEvent ae) {
       StringBuffer sb=new StringBuffer();
       String str=null;
       Runtime runtime=Runtime.getRuntime();
       Process process=null;
       String IP_Address=address_textField.getText();
       String command="ping "+IP_Address;
       try {
           process = runtime.exec(command);
           BufferedReader in=new BufferedReader(
                   new InputStreamReader(process.getInputStream()));
           while((str=in.readLine())!=null){
               sb.append(str+"\n");
           }
       } catch (IOException e) {
           e.printStackTrace();
       }
       textArea.setText(sb.toString());
   }
}

三、总结

本次实验使用的实现ping的方法是直接通过调用命令提示符窗口去执行ping命令，在gui界面显示ping后的结果有时间延时，之后会考虑换种方法实现ping功能。在所给出的压缩包中，附有可运行的jar包，可执行的exe文件，jre环境，动态的源码展示gif图片。运行之后的JFrame是一个香蕉图标的窗口。

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