断点续传 JAVA版 迅雷

多线程－断点续传下载工具 功能描述： 实现同时下载多个文件，下载的过程中可以临时终止下载，可以随时继续下载。 该源码全是干货。核心源码一幕了然。

package Download;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.objectInputStream;
import java.io.objectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JButton;
import javax.swing.Jframe;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class Downloadframe extends Jframe {
    private static final int THREAD_NUM = 4;
    private List itemList = new ArrayList（）;
    private transient InnerThread innerThread = new InnerThread（）;
    private static final String downloadInfoFile = “downloadInfo“;
    public Downloadframe（） {
        setSize（500 400）;
        add（createContentPane（））;
        setLocationRelativeTo（null）;
        setResizable（false）;
        setDefaultCloseOperation（Jframe.EXIT_ON_CLOSE）;
    }
    public void init（） {
        this.addWindowListener（new WindowAdapter（） {
            @Override
            public void windowClosing（WindowEvent e） {
                if （itemList != null && itemList.size（） > 0） {
                    for （DownloadItem item : itemList） {
                        if （item.status == DownloadItem.STATUS_START） {
                            item.stop（）;
                        }
                    }
                }
                save（Downloadframe.this）;
            }
        }）;
        if （itemList != null && itemList.size（） > 0） {
            for （DownloadItem item : itemList） {
                item.setActionListener（）;
            }
        }
        innerThread = new InnerThread（）;
        innerThread.start（）;
    }
    private Component createContentPane（） {
        JPanel p = new JPanel（new BorderLayout（））;
        p.setBackground（new Color（35 31 32））;
        p.add（BorderLayout.CENTER createTabPane（））;
        return p;
    }
    private JPanel createTabPane（） {
        JPanel p = new JPanel（new GridLayout（10 1 6 6））;
        p.setBackground（new Color（35 31 32））;
        p.setBorder（new EmptyBorder（8 8 8 8））;
        for （int i = 0; i < THREAD_NUM; i++） {
            DownloadItem item = new DownloadItem（）;
            // label
            JLabel label = new JLabel（）;
            label.setForeground（Color.WHITE）;
            item.label = label;
            // button
            JButton btn = new JButton（）;
            btn.setForeground（new Color（249 250 251））;
            btn.setBackground（new Color（220 31 36））;
            item.button = btn;
            // progressPanel
            ProgressPanel pp = new ProgressPanel（）;
            item.progressPanel = p

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2014-09-28 15:44  Download\
     文件         226  2013-08-31 22:37  Download\.classpath
     文件         367  2013-08-31 22:38  Download\.project
     目录           0  2014-09-28 15:44  Download\.settings\
     文件         110  2013-09-13 00:23  Download\.settings\org.eclipse.core.resources.prefs
     目录           0  2014-09-28 15:44  Download\bin\
     目录           0  2014-09-28 15:44  Download\bin\Download\
     文件        1259  2014-06-24 17:40  Download\bin\Download\Downloadframe$1.class
     文件        2156  2014-06-24 17:40  Download\bin\Download\Downloadframe$DownloadItem$1.class
     文件        2736  2014-06-24 17:40  Download\bin\Download\Downloadframe$DownloadItem.class
     文件        1051  2014-06-24 17:40  Download\bin\Download\Downloadframe$InnerThread.class
     文件         908  2014-06-24 17:40  Download\bin\Download\Downloadframe$ProgressPanel.class
     文件        5252  2014-06-24 17:40  Download\bin\Download\Downloadframe.class
     文件        2005  2014-06-24 17:40  Download\bin\Download\DownloadInfo.class
     文件        2861  2014-06-24 17:40  Download\bin\Download\DownloadThread.class
     文件         372  2013-08-31 22:48  Download\bin\readme
     文件       13122  2014-06-24 17:41  Download\downloadInfo
     目录           0  2014-09-28 15:44  Download\src\
     目录           0  2014-09-28 15:44  Download\src\Download\
     文件        8690  2013-09-03 17:09  Download\src\Download\Downloadframe.java
     文件        1869  2013-09-03 17:08  Download\src\Download\DownloadInfo.java
     文件        2073  2013-09-03 17:08  Download\src\Download\DownloadThread.java
     文件         372  2013-08-31 22:48  Download\src\readme