一个简单的下载程序

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Download.java
<span style="font-size:14px;">package Download;import java.net.*;import javax.swing.*;import java.awt.event.*;import java.io.*;public class Download{  public static void main(String[] args)  {    JFrame jf=new JFrame("我的下载程序");    jf.setSize(600,400);    jf.setLocation(100,100);    JPanel p=new JPanel();    JLabel l=new JLabel("Please input URL:");    final JTextField tf=new JTextField(30);    p.add(l);    p.add(tf);    jf.getContentPane().add(p,"North");    final JTextArea ta=new JTextArea();    jf.getContentPane().add(ta,"Center");    JButton btn=new JButton("Download");    jf.getContentPane().add(btn,"South");            btn.addActionListener(new ActionListener() {          public void actionPerformed(ActionEvent e) {            String str=tf.getText();            try {              URL url=new URL(str);              URLConnection urlConn=url.openConnection();              String line=System.getProperty("line.separator");              ta.append("Host: "+url.getHost());              ta.append(line);              ta.append("Port: "+url.getDefaultPort());              ta.append(line);              ta.append("ContentType: "+urlConn.getContentType());              ta.append(line);              ta.append("ContentLength: "+urlConn.getContentLength());              InputStream is=urlConn.getInputStream();              //InputStreamReader isr=new InputStreamReader(is);              //BufferedReader br=new BufferedReader(isr);              FileOutputStream fos=new FileOutputStream("1.html");              //String strLine;              //while((strLine=br.readLine())!=null)              int data;              while((data=is.read())!=-1)              {//                fos.write(strLine.getBytes());  //              fos.write(line.getBytes());                fos.write(data);              }              //br.close();              is.close();              fos.close();            }            catch (Exception ex) {              ex.printStackTrace();            }          }        });    jf.addWindowListener(new WindowAdapter() {         public void windowClosing(WindowEvent e) {           System.exit(0);         }       });    jf.show();  }}</span>
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