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)