import

java.awt.BorderLayout;

import

java.awt.Component;

import

java.awt.FlowLayout;

import

java.awt.GridLayout;

import

java.awt.event.

*

;

import

javax.swing.JButton;

import

javax.swing.JFrame;

import

javax.swing.JLabel;

import

javax.swing.JPanel;

import

javax.swing.JTextArea;

import

javax.swing.JTextField;

public

class

Crawler

extends

JFrame {

public

static

final

int

BOARD_WIDTH

=

540

;

public

static

final

int

BOARD_HEIGHT

=

570

;

public

static

final

int

X_LOCATION

=

100

;

public

static

final

int

Y_LOCATION

=

50

;

//

把节目分为上中三个Panel

JPanel northPanel

=

new

JPanel();

JPanel centerPanel

=

new

JPanel();

JPanel southPanel

=

new

JPanel();

//

输入

JTextField txtField

=

new

JTextField(

30

);

JLabel labelURL

=

new

JLabel(

"

Starting URL:

"

, JLabel.RIGHT);

//

输出

JTextArea txtArea

=

new

JTextArea(

10

,

40

);

JLabel labelTxt

=

new

JLabel(

"

Result

"

);

//

按钮

JButton startButton

=

new

JButton(

"

start

"

);

JButton cancelButton

=

new

JButton(

"

cancel

"

);

public

void

launchFrame()

throws

Exception{

//

界面初始化

this

.setLocation(X_LOCATION, Y_LOCATION);

this

.setSize(BOARD_WIDTH, BOARD_HEIGHT);

this

.setResizable(

false

);

this

.setVisible(

true

);

this

.setLayout(

new

GridLayout(

3

,

1

));

//

总体为三行一列布局

this

.add(northPanel);

this

.add(centerPanel);

this

.add(southPanel);

northPanel.add(labelURL);

northPanel.add(txtField);

centerPanel.setLayout(

new

FlowLayout());

centerPanel.add(labelTxt);

centerPanel.add(txtArea);

southPanel.setLayout(

new

FlowLayout());

southPanel.add(startButton);

southPanel.add(cancelButton);

startButton.addActionListener(

new

ActionListener(){

public

void

actionPerformed(ActionEvent e){

String url

=

txtField.getText();

txtArea.append(url

+

"

\n

"

);

}

});

cancelButton.addActionListener(

new

ActionListener(){

public

void

actionPerformed(ActionEvent e){

txtArea.setText(

""

);

}

});

this

.addWindowListener(

new

WindowAdapter(){

public

void

windowClosing (WindowEvent e){

System.exit(

0

);

}

});

}

public

static

void

main(String[] args)

throws

Exception {

new

Crawler().launchFrame();

}

}