addtaskdlg.java

一个java编写的下载器源码

package com.leapget.view;

import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;


public class AddTaskDlg extends JDialog {

	private static final long serialVersionUID = 20080807185430L;
	private static AddTaskDlg addTaskDlg;
	
	private JPanel jpMain;
	private JPanel jpFileUrl;
	private JPanel jpSavePath;
	private JPanel jpThreadCount;
	private JPanel jpStartDownload;
	private JComboBox jcbThreadCount;
	private JTextField jtfFileUrl;
	private JTextField jtfSavePath;
	private JButton jbtnView;
	private JButton jbtnStartDownload;
	private JFileChooser jfcSavePath;
	
	private String fileUrl,savePath;
	private int threadCount;
	private boolean canceled;

	public AddTaskDlg(JFrame parent, boolean modal){
		super(parent,"添加下载任务",modal);
		initComponent();
	}
	public boolean isCanceled(){
		return canceled;
	}
	public String getFileUrl(){
		return fileUrl;
	}
	public String getSavePath(){
		return savePath;
	}
	public int getThreadCount(){
		return threadCount;
	}
	// 初始化界面
	private void initComponent(){
		// 文件地址
		jpFileUrl = new JPanel(new FlowLayout(FlowLayout.LEFT));
		jpFileUrl.add(new JLabel("地址："));
		jtfFileUrl = new JTextField(30);
		jtfFileUrl.setText("http://www.newskynet.com/HwNetView.zip");
		jtfFileUrl.addFocusListener(new FocusAdapter(){
			@Override
			public void focusLost(FocusEvent evt) {
				jtfFileUrlFocusLost(evt);
			}
		});
		jpFileUrl.add(jtfFileUrl);
		
		// 保存路径
		jpSavePath = new JPanel(new FlowLayout(FlowLayout.LEFT));
		jpSavePath.add(new JLabel("路径："));
		jtfSavePath = new JTextField(23);
		jpSavePath.add(jtfSavePath);
		jbtnView = new JButton("浏览...");
		jbtnView.addMouseListener(new MouseAdapter(){
			@Override
			public void mouseClicked(MouseEvent evt){
				jbtnViewMouseClicked(evt);
			}
		});
		jpSavePath.add(jbtnView);
		
		// 线程数量
		jpThreadCount = new JPanel(new FlowLayout(FlowLayout.LEFT));
		jpThreadCount.add(new JLabel("线程数量："));
		jcbThreadCount = new JComboBox(new Integer[]{1,2,3,4,5,10,15,20,25,30,35,40,45,50});
		jcbThreadCount.setEditable(true);
		jpThreadCount.add(jcbThreadCount);
		
		// 开始下载
		jpStartDownload = new JPanel();
		jbtnStartDownload = new JButton("开始下载");
		jbtnStartDownload.addMouseListener(new MouseAdapter(){
			@Override
			public void mouseClicked(MouseEvent evt){
				jbtnStartDownloadMouseClicked(evt);
			}
		});
		jpStartDownload.add(jbtnStartDownload);
		
		// 依次添加各个Panel
		jpMain = new JPanel();
		jpMain.setLayout(new GridLayout(0,1));
		jpMain.add(jpFileUrl);
		jpMain.add(jpSavePath);
		jpMain.add(jpThreadCount);
		jpMain.add(jpStartDownload);
		jpMain.add(jpStartDownload);

		JPanel jpPadding = new JPanel(); // 设置四边与窗口的边距 
		jpPadding.setLayout(new FlowLayout(FlowLayout.CENTER,5,15));
		jpPadding.add(jpMain);
		
		setResizable(false);
		setVisible(false);
		getContentPane().add(jpPadding);
		setBounds(320, 250, 450, 215);
		
		this.addWindowListener(new WindowAdapter(){
			@Override
			public void windowClosing(WindowEvent evt) {
				closeAddTaskDlg();
				canceled = true;
			}
		});
	}
	// 关闭当前窗口
	public void closeAddTaskDlg(){
		jtfFileUrl.setText("http://");
		jtfSavePath.setText("");
		jcbThreadCount.setSelectedIndex(0);
		jtfFileUrl.setFocusable(true);
		this.setVisible(false);
	}
	// 处理下载地址输入框失去焦点
	public void jtfFileUrlFocusLost(FocusEvent evt){
		if(jtfSavePath.getText().trim().length()==0){
			String fileUrl = jtfFileUrl.getText();
			int head=fileUrl.lastIndexOf('/') + 1;
			jtfSavePath.setText(fileUrl.substring(head));//获得要下载的文件的文件名
		}
	}
	// 点击浏览按钮选择保存路径
	public void jbtnViewMouseClicked(MouseEvent evt){
		jfcSavePath = new JFileChooser();
		jfcSavePath.showSaveDialog(this);
		if(jfcSavePath.getSelectedFile() != null){
			jtfSavePath.setText(jfcSavePath.getSelectedFile().getPath());
		}
	}
	// 验证Url正确性
	private boolean validUrl(String url) {
		boolean result = true;
		if("".equals(url)){
			JOptionPane.showMessageDialog(null, "文件路径不能为空！", "错误", JOptionPane.ERROR_MESSAGE);
			result = false;
		}else if (!url.toLowerCase().startsWith("http://")
				|| url.substring(url.lastIndexOf("/")+1).length() < 1){
			JOptionPane.showMessageDialog(null, "文件 " + url + " 不是有效的路径！", "错误", JOptionPane.ERROR_MESSAGE);
			jtfFileUrl.setSelectionStart(0);
			jtfFileUrl.setSelectionEnd(jtfFileUrl.getText().length());
			result = false;
		}
		if(!result) jtfFileUrl.setFocusable(true);
		return result;
	}	
	// 验证文件是否已经存在
	private boolean validSave(String save){
		Pattern p=Pattern.compile("[<,>,\\,\\?,\\\\,\\*,\\/:]+"); //正则表达式
		Matcher m=p.matcher(save); //操作的字符串
		File f = new File(save);
		boolean result = true;
		if("".equals(save)){
			JOptionPane.showMessageDialog(null, "文件名不能为空！", "错误", JOptionPane.ERROR_MESSAGE);
			result = false;
		}else if(m.find()){
			JOptionPane.showMessageDialog(null, "文件名不合法，不能包含 <>\\/*?: 中的任一字符！", "错误", JOptionPane.ERROR_MESSAGE);
			result = false;
		}else if(f.exists()){
			if(JOptionPane.showConfirmDialog(null, "文件 " + save + " 已经存在,是否覆盖？", "提示", 
					JOptionPane.YES_NO_OPTION,JOptionPane.INFORMATION_MESSAGE) == JOptionPane.YES_OPTION)
				result = true;
			else{
				jtfSavePath.setSelectionStart(0);
				jtfSavePath.setSelectionEnd(jtfSavePath.getText().length()-1);
				result = false;
			}
		}
		if(!result) jtfSavePath.setFocusable(true);
		return result;
	}
	// 点击开始下载按钮
	public void jbtnStartDownloadMouseClicked(MouseEvent evt){
		fileUrl = jtfFileUrl.getText().trim();
		savePath = jtfSavePath.getText().trim();
		threadCount = ((Integer)jcbThreadCount.getSelectedItem()).intValue();
		/*if(validUrl(url) && validSave(save)){
			MainAppFrame parent = (MainAppFrame)this.getParent();
			parent.addTask(url,	save, ((Integer)jcbThreadCount.getSelectedItem()).intValue());
			closeAddTaskDlg(); // 关闭当前对话框
		}*/
		if(validUrl(fileUrl) && validSave(savePath)){
			closeAddTaskDlg(); // 关闭当前对话框
			canceled = false;
		}
	}
}