新手求解释,该怎么解决

新手求解释

import java.awt.Dialog;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.net.Socket;

import java.io.*;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JTextArea;

import javax.swing.JTextField;

public class IE {

	private JFrame frame;

	private JTextField jtf;

	private JTextArea  jta;

	private JButton button;

	private Dialog dl;

	private JLabel label;

	private JButton okButton;

	public IE(){

		init();

		initDialog();

	}

	private void init(){

		frame=new JFrame("IE");

		frame.setSize(500,400);

		jtf=new JTextField(30);

		jta=new JTextArea(50,40);

		button=new JButton("转到");

		frame.setLayout(new FlowLayout());

		frame.add(jtf);

		frame.add(button);

		frame.add(jta);	

		addEventOnFrame();

		frame.setVisible(true);

	}

	public void initDialog(){

		dl=new Dialog(frame,"错误提示",true);

		dl.setBounds(80,80,200,200);

		label=new JLabel();

		dl.setLayout(new FlowLayout());

		dl.add(label);

		okButton=new JButton("确定");

		dl.add(okButton);

		addEventOnDialog();

	}

	private void addEventOnFrame(){

			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

			frame.addWindowListener(new WindowAdapter(){

				@Override

				public void windowClosing(WindowEvent e){

					System.exit(0);

				}

			});

			button.addActionListener(new ActionListener(){

				@Override

				public void actionPerformed(ActionEvent e){

					listDir();

				}

			});

			jta.addKeyListener(new KeyAdapter(){

				@Override

				public void keyPressed(KeyEvent e){

					if(e.getKeyCode()==KeyEvent.VK_ENTER)

						listDir();

				}

			});

	}

	private void addEventOnDialog(){

		okButton.addActionListener(new ActionListener(){

			public void actionPerformed(ActionEvent e){

				dl.setVisible(false);

			}

		});

		dl.addWindowListener(new WindowAdapter(){

			@Override

			public void windowClosing(WindowEvent e){

				System.exit(0);

			}

		});

		okButton.addKeyListener(new KeyAdapter(){

			@Override

			public void keyPressed(KeyEvent e){

				if(e.getKeyCode()==KeyEvent.VK_ENTER)

					dl.setVisible(false);

			}

		});

	}

	private void listDir(){

		jta.setText("");

		String url=jtf.getText();

		int index1=url.indexOf("//")+2;

		int index2=url.indexOf("/",index1);

		//截取IP地址和端口号

		String str=url.substring(index1,index2);

		String[]arr=str.split(":");

		if(arr.length!=2){

			label.setText(url+"输入有误");

			dl.setVisible(true);

		}

		String host=arr[0];

		int port=Integer.parseInt(arr[1]);

		jta.setText(host+"..."+port);

		Socket s=null;

		PrintStream ps=null;

		try{

			s=new Socket(host,port);

			ps=new PrintStream(s.getOutputStream());

			ps.println("GET/demo.html HTTP/1.1");

			ps.println("Accept:*/*");

			ps.println("Accept-Language:zh-CN");

			ps.println("Connection:Keep-alive");

			ps.println();

			ps.println();

			BufferedReader br=

					new BufferedReader(

							new InputStreamReader(s.getInputStream()));

			String line;

			while((line=br.readLine())!=null){

				jta.append(line+"\r\n");

			}

			ps.close();

			s.close();

		}catch(IOException e){

			e.printStackTrace();

		}

	}

	public static void main(String []args){

		new IE();

	}

}

输入http://127.0.0.1:8080/demo.html
为什么老抛
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(SocketInputStream.java:168)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
at java.io.InputStreamReader.read(InputStreamReader.java:167)
at java.io.BufferedReader.fill(BufferedReader.java:136)
at java.io.BufferedReader.readLine(BufferedReader.java:299)
at java.io.BufferedReader.readLine(BufferedReader.java:362)
at IE.listDir(IE.java:123)
at IE.access$0(IE.java:93)
at IE$2.actionPerformed(IE.java:62)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6216)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5981)
at java.awt.Container.processEvent(Container.java:2041)