import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

public class ep10_14 {

public static void main(String args[]){

new DownNetFile();

}

}

class DownNetFile extends JFrame implements ActionListener {

JTextField infield = new JTextField(30);

JTextArea showArea = new JTextArea();

JButton b = new JButton("download");

JPanel p = new JPanel();

DownNetFile(){

super("read network text file application");

Container con = this.getContentPane();

p.add(infield);

p.add(b);

JScrollPane jsp = new JScrollPane(showArea);

b.addActionListener(this);

con.add(p,"North");

con.add(jsp,"Center");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setSize(500,400);

setVisible(true);

}

public void actionPerformed(ActionEvent e){

readByURL(infield.getText());

}

public void readByURL(String urlName){

try{

URL url = new URL(urlName); //由网址创建URL对象

URLConnection tc = url.openConnection(); //获得URLConnection对象

tc.connect(); //设置网络链接

InputStreamReader in = new InputStreamReader(tc.getInputStream());

BufferedReader dis = new BufferedReader(in); //采用缓存式输入

String inline;

while ((inline = dis.readLine()) != null){

showArea.append(inline + "\n");

}

dis.close(); //网上资源使用结束后，数据流及时关闭

}catch (MalformedURLException e){

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();;

}

}

}