download.java~1~

自己编写的一个在Java中通过http协议多线程下载的一个程序例子。通过HTTP请求先得到文件长度

package MTdownload;

import javax.swing.UIManager;
import java.awt.*;

public class DownLoad{
	private boolean packFrame = false;
	
	public DownLoad(){//构造体建立一个dlFrame的实例
		DLFrame frame = new DLFrame();
		
		if(packFrame){
			frame.pack();
		}
		else{
			frame.validate();	
		}
		
		//将应用程序窗口放置到屏幕中央
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		Dimension frameSize = frame.getSize();
		if (frameSize.height > screenSize.height) {
      	frameSize.height = screenSize.height;
    	}
    	if (frameSize.width > screenSize.width) {
     	 frameSize.width = screenSize.width;
    	}
    	frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    	frame.setVisible(true);	
	}
	
	public static void main(String[] args){
		try{
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());	
		}	
		catch(Exception e){
			e.printStackTrace();
		}
		new DownLoad();
	}	
}