JAVA多线程复制文件

关于JAVA多线程复制文件的一次尝试

主线程：

package  org.ota.action;

import  java.io.File;

/** */ /**
 *
 *
 * 

application name:

 * 

application describing:多线程读文件和写文件

 * 

 * 

company:neusoft

 * 

time:Nov 24, 2007

 * @author OTA
 * @version $Revision
 */  
public   class  HtmlPraser  extends  Thread
... {   
    boolean stop = false;
    
    SubThread[] sub = new SubThread[5];
    
    public void run()
    ...{
        File file = new File("d:/a.txt");
            for(int i=0;i<5;i++)
            ...{
                sub[i] = new SubThread("D:/temp.txt",i,file.length());
                sub[i].start();
            }
            while(!stop)
            ...{
                try
                ...{
                    Thread.sleep(500);
                }
                catch (InterruptedException e)
                ...{
                    e.printStackTrace();
                }
                for(int i=0;i<5;i++)
                ...{
                    stop = true;
                    if(sub[i].done == false)
                    ...{
                        stop = false;
                        break;
                    }
                }
            }
            System.out.println("文件传输完毕");
    }
    
    public static void main(String[] args)
    ...{
        HtmlPraser html = new HtmlPraser();
        html.start();
    }

}

子线程：

package  org.ota.action;

import  java.io.FileNotFoundException;
import  java.io.IOException;
import  java.io.RandomAccessFile;

public   class  SubThread  extends  Thread
... {
    RandomAccessFile oSavedFile;
    
    RandomAccessFile oFromFile;
    
    String threadID;
    
    long length;
    
    int start;
    
    int end;
    
    int n;
    
    boolean done = false;
    
    /** *//**
     * 构造器方法,找到此线程的文件指针
     * 
     * @param path
     * @param i
     * @param length
     * @see: 
     * @author: OTA
     */
    public SubThread(final String path,int i,long length)
    ...{
        try
        ...{
            oSavedFile = new RandomAccessFile(path, "rw");
            oFromFile = new RandomAccessFile("d:/a.txt","rw");
            this.length = length;    
            start = (int) (i*(length/5));
            end = (int)((i+1)*(length/5));
            oSavedFile.seek(start);//定位到START的位置进行下载
            oFromFile.seek(start);
            this.threadID = "第"+i+"线程";
            System.out.println(start);
        }
        catch (FileNotFoundException e)
        ...{
            e.printStackTrace();
        }
        catch (IOException e)
        ...{
            e.printStackTrace();
        }
    }
    
    public void run()
    ...{
        try
        ...{
            byte[] buf = new byte[1024]; 
            while(start<end&&start!=-1)
            ...{
                Thread.sleep(1);
                start += oFromFile.read(buf, 0, 1024);
                oSavedFile.write(buf,0,1024);
                System.out.println("写入"+1024+"字节到"+this.threadID);
            }
            done = true;
            System.out.println(this.threadID+"结束");
        }
        catch (FileNotFoundException e)
        ...{
            e.printStackTrace();
        }
        catch (IOException e)
        ...{
            e.printStackTrace();
        }
        catch (InterruptedException e)
        ...{
            e.printStackTrace();
        }
        
    }

}