Question

我有一台设备机器。即通过连接到我的电脑的LAN电缆RJ45引脚发送数据报包LAN端口。

我从命令提示符执行代码时可以获取数据。得到适当的输出。但是当我在我的浏览器上使用相同的applet加载（Mozila FireFox）它连接到我的端口准备读取我的数据包。但是当我从设备机器向我的计算机发送数据时。我创建了.java文件，.class文件，.jar文件。将我的applet加载到HTML / ASPX页面。什么都没发生。在Java控制台中没有显示任何内容没有错误，没有例外。没有数据。整个小程序被绞死。

所以请帮助我。我该怎么办？

<HTML>
   <HEAD>
   </HEAD>
      <BODY>
      <div >
         <APPLET CODE = "FCApplet.class" WIDTH = "800" HEIGHT = "500"></APPLET>
      </div>
   </BODY>

import javax.swing.JApplet;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.*;
import java.awt.event.*;
import java.applet.*;
import java.awt.*;
import java.util.*;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.io.*;
import java.lang.*;
import java.net.*;
public class FCApplet extends JApplet implements ActionListener , Runnable  
{
    Thread th = new Thread(this);
    TextField txtID,txtName,txtResult;
    Label lblID,lblName,lblResult;
    String MemberID;
    Panel p2;
    public void init()
    {
        setBackground(Color.decode("#BFBFBF"));
        lblID = new Label(" ID ");
        lblID.setFont(new Font("Verdana", Font.BOLD , 12));
        txtID= new TextField();

        lblName= new Label(" Name ");
        lblName.setFont(new Font("Verdana", Font.BOLD , 12));
        txtName= new TextField();

        lblResult= new Label(" Result ");
        lblResult.setFont(new Font("Verdana", Font.BOLD , 12));
        txtResult= new TextField();

        Button b = new Button("Connect");
        b.setFont(new Font("Verdana", Font.BOLD , 12)); 
        b.addActionListener(this);

        p2=new Panel();
                    p2.setLayout(new GridLayout(1,10,5,5));
        p2.setPreferredSize(new Dimension(900, 20));
                    p2.add(lblID);
                  p2.add(txtID);
                p2.add(lblName);
                  p2.add(txtName);
        p2.add(lblResult);
                  p2.add(txtResult);
                  p2.add(b);

        GridBagLayout gbl = new GridBagLayout();
        setLayout(gbl);
            GridBagConstraints c = new GridBagConstraints();
            c.anchor = GridBagConstraints.WEST;
            c.fill=GridBagConstraints.HORIZONTAL;
            c.insets = new Insets(10,10,10,10);
        c.fill=GridBagConstraints.HORIZONTAL; 
            c.gridy=1; 
            gbl.setConstraints(p2,c);     
        add(p2);
    }
    public void StartTest()
    {
        DatagramSocket sock = null;
        try
                {
                    sock = new DatagramSocket(8001);
                            byte[] buffer = new byte[1024];
                    DatagramPacket incoming = new DatagramPacket(buffer, buffer.length);
                                System.out.println("Server socket created. Waiting for incoming data...");

            try 
            {
            Thread.sleep(15000);
                        while(true)
                        {
                try 
                {
                 sock.receive(incoming);
                }
                catch(Exception ex) 
                {
                    System.err.println("IOException " + ex);
                }
                          byte[] data = incoming.getData();
                if(data != null)
                {
                    System.out.println("Data is not blank...");
                }
                else
                {
                    System.out.println("Data is blank...");
                }
                            String s = new String(data, 0, incoming.getLength());
                          System.out.println(incoming.getAddress().getHostAddress() + " : " + incoming.getPort() + " : " + s);

              if(s != "" )
             {

                String R = incoming.getAddress().getHostAddress() + " : " + incoming.getPort() + " : " + s;
                //lblResultTest.setText(R);
                String[] words = s.split("&");

                txtResult.setText(words[2]);
                this.getAppletContext().showDocument( this.getDocumentBase() );
            }   

                        }
        }
        catch(InterruptedException ex) 
        {
            Thread.currentThread().interrupt();
        }

        }

                catch(IOException e)
        {
                      System.err.println("IOException " + e);
            System.out.print("Exception: ");
            System.out.println(e.getMessage());
                }
    }
    public void run() 
    {
        try 
        {
            Thread.sleep(1000);
        }
        catch(InterruptedException ex) 
        {
            Thread.currentThread().interrupt();
        }
    }
    public void actionPerformed(ActionEvent e)
    {
        Button source = (Button)e.getSource();
        if(source.getLabel() == "Connect")
        {
            StartTest(); 
        }
        else{
            JOptionPane.showMessageDialog(null,"Please Provide Input","alert",JOptionPane.WARNING_MESSAGE);  
        }   
    }
}

当UDP数据报包数据到达LAN端口时。读取这些数据并在Web浏览器上运行java applet上的显示？

0 个答案: