java 界面输入 网址 查询网页源码

//此文档为网络视频整理，为网络编程基础
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.io.InputStream;
import https://www.wendangku.net/doc/9c9603868.html,.MalformedURLException;
import https://www.wendangku.net/doc/9c9603868.html,.URL;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

class Win extends JFrame implements ActionListener,Runnable
{
JButton button;
URL url;
JTextField text;
JTextArea area;
byte b[] =new byte[110];
Thread thread;

public Win()
{
text =new JTextField(20);
area =new JTextArea(12,12);
button =new JButton("确定");

button.addActionListener(this);

thread=new Thread(this);

JPanel p=new JPanel();

p.add(new JLabel("输入网址："));
p.add(text);
p.add(button);

Container con = this.getContentPane();

con.add(new JScrollPane(area),BorderLayout.CENTER);
con.add(p, BorderLayout.NORTH);

setBounds(60,60,400,300);

setVisible(true);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

public void actionPerformed(ActionEvent e)
{
if(!(thread.isAlive()))
{
thread=new Thread(this);

try {
thread.start();
} catch (Exception e1) {
JOptionPane.showMessageDialog(this, "我正在读取，请稍后","提示信息",
JOptionPane.ERROR_MESSAGE);
}
}

}

public void run()
{
try {
int n= -1;
area.setText(null);

url=new URL(text.getText().trim());
InputStream in=url.openStream();

while((n=in.read(b)) != -1)
{
String s = new String(b,0,n);
area.append(s);
}
} catch (MalformedURLException e) {

text.setText(""+e);
return;
} catch (IOException e) {

text.setText(""+e);
return;
}
}
}
public class UrlConnection4
{
public static void main(String args[])
{
new Win();
}
}