/*
使用图形界面模拟浏览器，同时使用URL中的URLConnection类实现网络的连接
URLConnection是应用层的类，使用后会将位于传输层的信息（如http的应答消息头）拆包，
但是无法解析网页特有的编程语言，如HTML语言，此方法将Socket、URL等服务封装起来，可以
实现URL内容的自动获取和发送，此类一旦使用，就会连接指定网址，使用十分方便，一定要
熟练掌握并运用。
*/
package net.socket.tcp;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
public class GUIURL
{
private Frame f;
private Button b;
private TextField tf;
private TextArea ta;
private Dialog d;
private Button but;
private Label lab;;
GUIURL()
{
init();
}
public void init()
{
f = new Frame("窗体测试");
f.setBounds(300,100,600,500);
f.setLayout(new FlowLayout());
tf = new TextField(50);
b = new Button("转到");
ta = new TextArea(25,40);
f.add(tf);
f.add(b);
f.add(ta);
d = new Dialog(f,"错误提示信息",true);
d.setBounds(500,300,300,100);
d.setLayout(new FlowLayout());
lab = new Label();
but = new Button("确定");
d.add(lab);
d.add(but);
myEvent();
f.setVisible(true);
}
private void myEvent()
{
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
//通过按钮“转到”实现目录输出功能及对话框弹出功能
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
try
{
showDir();
}
catch (Exception ex)
{
}
}
});
//实现对话框的窗口关闭功能
d.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
d.setVisible(false);
}
});
//实现对话框上的按钮“确定”的功能
but.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
d.setVisible(false);
}
});
//通过回车键实现按钮“转到”的功能
tf.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode()==KeyEvent.VK_ENTER)
{
try
{
showDir();
}
catch (Exception ex)
{
}
}
}
});
}
private void showDir() throws Exception
{
ta.setText("");
String urlPath = tf.getText();
URL url = new URL(urlPath);
URLConnection conn = url.openConnection();
System.out.println(conn);
InputStream in = conn.getInputStream();
byte[] buf = new byte[1024*1024*5];
int line = in.read(buf);
ta.append(new String(buf,0,line));
in.close();
}
public static void main(String[] args)
{
new GUIURL();
}
}
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