怎么样实现GUI界面和下载代码联系起来 通过按一个按钮就能实现下载 用监听器是吧

Question

如题   我需要的最好是具体的代码   谢谢各位大侠

Answer 1

是的，如果用Swing的话，就是在监听器的actionPerformed方法中做。

Answer 2

import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class DownLoad implements ActionListener
{
    private Frame f;
    private TextField tf;
    private Panel p1,p2,p3;
    private TextArea ta;
    private Label l1,l2;
    private Button b;
    public static void main(String args [])
    {
        new DownLoad().init();
    }
    public void init()
    {
        f=new Frame("蝴蝶下载程序");
        f.setSize(600,400);
        f.setLocation(100,100);
        l1=new Label("请输入URL:");
        l2=new Label("蝴蝶下载支持的类型为:html,jpg,txt,psd,wav,doc,ppt,bmp,exe,mp3,rm,jsp,zip,gif,class");
        tf=new TextField(30);
        p1=new Panel();
        p2=new Panel();
        p1.add(l1);
        p1.add(tf);
        p2.add(l2);
        p3=new Panel();
        p3.setLayout(new GridLayout(2,1));
        p3.add(p1);
        p3.add(p2);
        f.add("North",p3);
        ta=new TextArea();
        f.add(ta);
        b=new Button("下载");
        f.add("South",b);
        b.addActionListener(this);
        f.addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                f.setVisible(false);
                f.dispose();
                System.exit(0);
            }
        });
        f.setVisible(true);    
    }
    public void actionPerformed(ActionEvent e)
    {
        String str=tf.getText();
        try
        {
            URL url=new URL(str);
            URLConnection urlcon=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:"+urlcon.getContentType());
            ta.append(line);
            ta.append("ContentLength:"+urlcon.getContentLength());  
            ta.append(line);
            String type=urlcon.getContentType();
            if(type.equals("text/html"))
                type="html";
            else if(type.equals("text/plaign"))
                type="txt";
            else if(type.equals("image/x-photoshop"))
                type="psd";
            else if(type.equals("audio/x-wav"))
                type="wav";
            else if(type.equals("application/msword"))
                type="doc";
            else if(type.equals("application/powerpoint"))
                type="ppt";
            else if(type.equals("image/bmp"))
                type="bmp";
            else if(type.equals("exe"))
                type="exe";
            else if((type.equals("audio/x-mpeg")) | (type.equals("audio/mpeg")))
                type="mp3";
            else if(type.equals("application/vnd.rn-realmedia"))
                type="rm";
            else if(type.equals("text/html;charset=ISO-8859-1"))
                type="jsp";
            else if(type.equals("application/zip"))
                type="zip";
            else if(type.equals("image/gif"))
                type="gif";
            else if(type.equals("application/java"))
                type="class";    
            else if(type.equals("image/jpeg"))
                type="jpg";
            InputStream is=urlcon.getInputStream();
            //InputStreamReader ipr=new InputStreamReader(is);
           // BufferedReader br=new BufferedReader(ipr);
            FileOutputStream fos=new FileOutputStream("d:/Download/Download."+type);
            //String strLine;
           //while((strLine=br.readLine())!=null)
            //{
               // fos.write(strLine.getBytes());
               // fos.write(line.getBytes());
           // }
            //br.close();
            int data;
            while((data=is.read())!=-1)
            {
                fos.write(data);
            }
            fos.close();
            is.close();
            ta.append("下载完毕！");
            ta.append(line);
        }
        catch(Exception ex)
        {
            ta.append("下载错误");
            ta.append(System.getProperty("line.seperator"));
        }
                
    }}在学校的时候写的一个简单程序，楼主可以看看！