import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
 
public class CopyFile {
    
    public static void DecodeRes2ByFile(File inFile) throws Exception
    {
        String m_strKey1 = "E5BCB9C350916554349299514FB2B8F8D6B6F38685A7D1971962BDD2F5E0CACDE944D93CA34D0874AB6807F3BD60571A2FAAC7DA2E282324C105F4F23C575810F324E80BE542462782BADE04889A57C0C599911C6E652E6CD5BFD7FF3E6B782E10798621F04D98606B73BAA3F4AE20DEE196851AD1DE44994D108E9F90F0483";
        String m_strKey2 = "1F4057E499C8143031D80E7C3305F74A0AE2BBB1EE77AEB61788883C18E94FCE6DB1176D5B8C3F8345953CFBA30D0503C1924CC48EF4B9530E0FA68900C09E705026F5EC9EDAAF8D69249CFFC303982734976FF92A515DA58B3261B70303D82D63153ACEE65BC9DA2EF09B55F6D24DE9E1276F4D9E574E018D3B2BA4F9520856";

        int key1Len = m_strKey1.length();
        int key2Len = m_strKey2.length();
                       
        File tmp_dir=new File("c:\\temp");
        if(!tmp_dir.exists())
        {
            tmp_dir.mkdir();
        }
        
        String targetFile=tmp_dir+"\\"+inFile.getName();
        File out = new File(targetFile);
        FileInputStream fin=new FileInputStream(inFile);
        FileOutputStream fout=new FileOutputStream(out);
     
        int length=2097152;//2m内存
        byte[] buffer=new byte[length];
         
        int     curLength = 0;
        while(true)
        {
            int ins=fin.read(buffer);
            
            
            if(ins==-1)
            {
                fin.close();
                fout.flush();
                fout.close();
                break;                 
            }
            else
            {
                for(int i=0;i<ins;i++)
                {
                    buffer[i]^=m_strKey1.substring(curLength%key1Len,curLength%key1Len+1).getBytes("UTF8")[0];
                    buffer[i]^=m_strKey2.substring(curLength%key2Len,curLength%key2Len+1).getBytes("UTF8")[0];
                    
                    curLength++;
                }
                fout.write(buffer,0,ins);
            }             
        }
        //删除原始文件
        inFile.delete();  
        //移动到原始文件
        out.renameTo(inFile);
    }
    
    /**
     * 功能：递归指定的目录，解密文件
     * 作者：黄海
     * 时间：2014-06-19
     * @param file
     * @throws Exception
     */
    public static void DecodeRes2ByPath(File file) throws Exception
    {
        if (file.isDirectory()) {
            File[] filearry = file.listFiles();
            for (File f : filearry) {
                if (f.isDirectory()) 
                {
                    System.out.println(f.getAbsoluteFile());
                } 
                else 
                {
                     DecodeRes2ByFile(new File(f.getAbsolutePath()));
                     System.out.println("成功完成："+f.getAbsolutePath());
                }
                
                DecodeRes2ByPath(f);
            }
        }
    }
    static public void main(String args[]) throws Exception 
    {
                 
         //处理指定目录，将目录下递归所有文件，然后解密文件,单线程
         //File root = new File("C:\\Old");
         //DecodeRes2ByPath(root);
                  
        
         //获取一组文件，准备要处理的文件.形成列表
         String filepath="C:\\Old\\image\\200810";
         File f=new File(filepath);
         File flist[] = f.listFiles();
        
         
         //使用多线程对文件进行一个一个的处理，解决文件。
         ThreadPool threadPool = new ThreadPool(4); //创建一个有个4工作线程的线程池  
         Thread.sleep(400); //休眠400毫秒,以便让线程池中的工作线程全部运行  
         //运行任务  
         for (int i = 0; i <flist.length; i++) 
         { //创建N个任务  
             threadPool.execute(DecodeFileMultiThread(flist[i]));  
         }  
         threadPool.waitFinish(); //等待所有任务执行完毕  
         threadPool.closePool(); //关闭线程池  
    }
    
    private static Runnable DecodeFileMultiThread(final File taskID) 
    {  
        return new Runnable() 
        {  
            public void run() 
            {
                try 
                {
                    DecodeRes2ByFile(taskID);
                }
                catch (Exception e) 
                {
                    e.printStackTrace();
                }
            }  
        };  
    }  
}