taskdialog.java

来自「用Java开发的多线程下载工具」· Java 代码 · 共 334 行

package gui;

/**
 *功能：添加下载任务对话框
 */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
import java.io.File;

/**
 * 功能：对话框主窗口
 */
public class TaskDialog
{
	private boolean btnOK;// 是否按下“确定”按钮

	private String urlStr;

	private String fileStr;

	private int threadId;

	private Top_pane topPan;

	private Tool_pane botPan;

	private JDialog d;

	public TaskDialog(JFrame f)
	{

		d = new JDialog(f, "添加下载任务", true);
		setGUI();
		setEvent();
		d.setVisible(true);
	}

	/**
	 * 功能：设置对话框界面
	 */
	private void setGUI()
	{
		topPan = new Top_pane();
		botPan = new Tool_pane();

		d.setLayout(new BorderLayout());
		d.getContentPane().add(topPan, BorderLayout.CENTER);
		d.getContentPane().add(botPan, BorderLayout.SOUTH);

		d.setSize(350, 200);
		d.setLocation(400, 350);
	}

	/**
	 * 功能：设置组件的监听事件
	 */
	private void setEvent()
	{
		d.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		botPan.btnClose.addActionListener(new BtnCancelListener());
		botPan.btn_OK.addActionListener(new BtnOKListener());
		topPan.btn_saveDialog.addActionListener(new OpenChooserListener());
	}

	/**
	 * 功能：获取用户是否点击对话框的确定按钮 返回类型：boolean
	 */
	public boolean getBtn()
	{
		return btnOK;
	}

	/**
	 * 功能：获取用户设置的URL地址 返回类型：String
	 */
	public String getUrlStr()
	{
		return urlStr;
	}

	/**
	 * 功能：获取保存文件名称 返回类型：String
	 */
	public String getFileStr()
	{
		return fileStr;
	}

	/**
	 * 功能：获取下载线程数 返回类型：String
	 */
	public int getThreadId()
	{
		return threadId;
	}

	/*
	 * 测试代码 public static void main(String[] args) { new TaskDialog(); }
	 */

	// 事件监听器代码
	/**
	 * 功能：单击打开保存对话框监听器
	 */
	class OpenChooserListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			// 调用打开对话框
			JFileChooser chooser = new JFileChooser();
			int result = chooser.showSaveDialog(d);
			if (result == JFileChooser.CANCEL_OPTION)
				return;
			topPan.txt_savefile.setText(chooser.getSelectedFile()
					.getAbsolutePath());
		}
	}

	/**
	 * 功能：单击确定按钮监听器
	 */
	class BtnOKListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			// 输入验证
			if ((topPan.txt_url.getText().equals(""))
					|| (topPan.txt_savefile.getText().equals("")))
			{
				JOptionPane.showMessageDialog(d, "请输入URL和下载文件名！");
				return;
			}
			// 验证URL地址格式是否正确
			if (!isURL(topPan.txt_url.getText()))
			{
				JOptionPane.showMessageDialog(d, "URL格式错误！");
				return;
			}
			// 验证保存文件名格式
			if (!isFile(topPan.txt_savefile.getText()))
			{
				JOptionPane.showMessageDialog(d, "保存文件名错误！");
				return;
			}
			urlStr = topPan.txt_url.getText();
			fileStr = topPan.txt_savefile.getText();
			Integer tmp = (Integer) (topPan.model.getValue());
			threadId = tmp.intValue();
			d.dispose();
			btnOK = true;
		}

		/**
		 * 功能：验证URL格式 返回值：boolean
		 */
		private boolean isURL(String tmp_url)
		{
			try
			{
				URL url1 = new URL(tmp_url);
				return true;
			}
			catch (MalformedURLException e)
			{
				return false;
			}
		}

		/**
		 * 功能：验证文件名格式 返回值：boolean
		 */
		private boolean isFile(String filename)
		{
			File tmp_file = new File(filename);
			if (tmp_file.isDirectory())
			{
				return false;
			}
			else
			{
				topPan.txt_savefile.setText(tmp_file.getAbsolutePath());
				return true;
			}
		}
	}

	/**
	 * 功能：单击取消按钮监听器
	 */
	class BtnCancelListener implements ActionListener
	{
		public void actionPerformed(ActionEvent e)
		{
			btnOK = false;
			urlStr = "";
			fileStr = "";
			d.dispose();
		}
	}
}

/**
 * 功能：对话框上方窗口中的panel
 */
class Top_pane extends JPanel
{
	JTextField txt_url;

	JTextField txt_savefile;

	JButton btn_saveDialog;

	SpinnerNumberModel model;

	public Top_pane()
	{
		super();
		ini();
	}

	private void ini()
	{
		JLabel lab_url = new JLabel("URL:");
		JLabel lab_savefile = new JLabel("文件名:");
		JLabel lab_threadId = new JLabel("线程数：");

		txt_url = new JTextField();
		txt_url.setPreferredSize(new Dimension(200, 25));
		txt_savefile = new JTextField();
		txt_savefile.setPreferredSize(new Dimension(150, 25));
		// txt_savefile.setEnabled(false);

		btn_saveDialog = new JButton("...");

		model = new SpinnerNumberModel(3, 1, 10, 1);
		JSpinner spn_threadId = new JSpinner(model);
		spn_threadId.setPreferredSize(new Dimension(200, 25));

		GridBagLayout gl = new GridBagLayout();
		this.setLayout(gl);

		GridBagConstraints gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 1;
		gbc.gridy = 1;
		gbc.insets.set(3, 4, 3, 4);
		gl.setConstraints(lab_url, gbc);
		this.add(lab_url);

		gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 1;
		gbc.gridy = 2;
		gbc.insets.set(3, 4, 3, 4);
		gl.setConstraints(lab_savefile, gbc);
		this.add(lab_savefile);

		gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 1;
		gbc.gridy = 3;
		gbc.insets.set(3, 4, 3, 4);
		gl.setConstraints(lab_threadId, gbc);
		this.add(lab_threadId);

		gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 2;
		gbc.gridy = 1;
		gbc.gridwidth = 2;
		gbc.insets.set(3, 4, 3, 4);
		gl.setConstraints(txt_url, gbc);
		this.add(txt_url);

		gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 2;
		gbc.gridy = 2;
		gbc.insets.set(3, 4, 3, 4);
		gl.setConstraints(txt_savefile, gbc);
		this.add(txt_savefile);

		gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 3;
		gbc.gridy = 2;
		gbc.insets.set(3, 0, 3, 4);
		gl.setConstraints(btn_saveDialog, gbc);
		this.add(btn_saveDialog);

		gbc = new GridBagConstraints();
		gbc.anchor = GridBagConstraints.WEST;
		gbc.gridx = 2;
		gbc.gridy = 3;
		gbc.gridwidth = 2;
		gbc.insets.set(3, 4, 3, 4);
		gl.setConstraints(spn_threadId, gbc);
		this.add(spn_threadId);

		this.setBorder(BorderFactory.createEtchedBorder());
	}
}

/**
 * 功能：对话框下方按钮工具条
 */
class Tool_pane extends JPanel
{
	JButton btn_OK;

	JButton btnClose;

	public Tool_pane()
	{
		super();
		ini();
	}

	private void ini()
	{
		btn_OK = new JButton("确定");
		btnClose = new JButton("取消");

		JPanel tmp_pane = new JPanel();
		tmp_pane.setLayout(new FlowLayout(FlowLayout.RIGHT, 10, 4));
		tmp_pane.add(btn_OK);
		tmp_pane.add(btnClose);
		this.setLayout(new FlowLayout(FlowLayout.RIGHT, 30, 2));
		this.add(tmp_pane);
		this.setBorder(BorderFactory.createEtchedBorder());
	}
}