package Method;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class NIOFileChannel {
	static FileOutputStream fileoutputstream=null;//ÎļþÊä³öÁ÷

	//´´½¨Ò»¸öÊä³öÁ÷->channle

	/**ÓÃNIO½«ÎļþдÈëij¸öÎļþ¼Ð
	 * @param filepath ÎļþдÈë·¾¶*/
	public static void setFileToFolder(String filepath,String str){
		try {
			fileoutputstream=new FileOutputStream(filepath);

			//ͨ¹ýfileputstream »ñÈ¡¶ÔÓ¦µÄFileChannle
			//filechannelµÄÕæʵÀàÐÍÊÇfilechannleImpl
			FileChannel fileChannle=fileoutputstream.getChannel();

			//´´½¨Ò»¸ö»º³åÇø ByteBuffel
			ByteBuffer byteBuffer=ByteBuffer.allocate(1024);

			//½«Str·ÅÈë byteBuffer
			byteBuffer.put(str.getBytes());

			//¶Ô byteBuffer½øÐÐflip£¬¶ÁдÇл»
			byteBuffer.flip();

			//½«byteBufferÖеÄÊý¾ÝдÈëµ½filechannel
			try {
				fileChannle.write(byteBuffer);
			} catch (IOException e) {
				// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
				e.printStackTrace();
			}
			if(fileoutputstream !=null) {
				try {
					fileoutputstream.close();
				} catch (IOException e) {
					// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
					e.printStackTrace();
				}
			}
		} catch (FileNotFoundException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
	}

	/**½«Îļþ´ÓÎļþ¼Ð¶ÁÈë
	 * @throws FileNotFoundException */
	public static void setFolderToFile(String pathname) throws FileNotFoundException {
		//´´½¨ÎļþµÄÊäÈëÁ÷
		File file=new File(pathname);

		FileInputStream fileInputStream=new FileInputStream(file);

		//ͨ¹ýfileInputStream»ñÈ¡¶ÔÓ¦µÄfilechannle
		FileChannel fileChannle=fileInputStream.getChannel();

		//´´½¨»º³åÇø
		ByteBuffer byteBuffer=ByteBuffer.allocate((int)file.length());

		//½«Í¨µÀµÄÊý¾Ý¶ÁÈëµ½bufferÖÐ
		try {
			fileChannle.read(byteBuffer);
			//½«byteBufferתΪStringÊä³ö

			System.out.println(new String(byteBuffer.array()));

		} catch (IOException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}

		try {
			fileInputStream.close();//¹Ø±ÕÊäÈëÁ÷
		} catch (IOException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}

	}

	/**Îļþ¿½±´*/
	public static void fileTofile(File in,File out) {
		FileInputStream fileInputStream=null;
		FileOutputStream fileOutputStream=null;
		try {
			fileInputStream = new FileInputStream(in);
		} catch (FileNotFoundException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
		FileChannel fileChannel01 = fileInputStream.getChannel();

		
		try {
			fileOutputStream = new FileOutputStream(out);
		} catch (FileNotFoundException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
		FileChannel fileChannel02 = fileOutputStream.getChannel();

		ByteBuffer byteBuffer = ByteBuffer.allocate(512);

		while (true) { //Ñ­»·¶ÁÈ¡

			//ÕâÀïÓÐÒ»¸öÖØÒªµÄ²Ù×÷£¬Ò»¶¨²»ÒªÍüÁË			
			byteBuffer.clear(); //Çå¿Õbuffer
			int read=0;
			try {
				read = fileChannel01.read(byteBuffer);
			} catch (IOException e) {
				// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
				e.printStackTrace();
			}
			System.out.println("read =" + read);
			if(read == -1) { //±íʾ¶ÁÍê
				break;
			}
			//½«buffer ÖеÄÊý¾ÝдÈëµ½ fileChannel02 -- 2.txt
			byteBuffer.flip();
			try {
				fileChannel02.write(byteBuffer);
			} catch (IOException e) {
				// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
				e.printStackTrace();
			}
		}

		//¹Ø±ÕÏà¹ØµÄÁ÷
		try {
			fileInputStream.close();
		} catch (IOException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
		try {
			fileOutputStream.close();
		} catch (IOException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
	}
	
	/**Îļþ¿ìËÙ¿½±´·½·¨
	 * @param sourse ÎļþÔ´
	 * @param destÎļþÄ¿±êµØÖ·*/
	
	public static void file_kao_bei(File sourse,File dest) {
		 //´´½¨Ïà¹ØÁ÷
        FileInputStream fileInputStream=null;
        FileOutputStream fileOutputStream=null;
		try {
			fileInputStream = new FileInputStream(sourse);
		} catch (FileNotFoundException e1) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e1.printStackTrace();
		}
       
		try {
			fileOutputStream = new FileOutputStream(dest);
		} catch (FileNotFoundException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}

        //»ñÈ¡¸÷¸öÁ÷¶ÔÓ¦µÄfilechannel
        FileChannel sourceCh = fileInputStream.getChannel();
        FileChannel destCh = fileOutputStream.getChannel();

        //ʹÓÃtransferFormÍê³É¿½±´
        try {
			destCh.transferFrom(sourceCh,0,sourceCh.size());
		} catch (IOException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
        
        //¹Ø±ÕÏà¹ØͨµÀºÍÁ÷
        try {
			sourceCh.close();
			destCh.close();
	        fileInputStream.close();
	        fileOutputStream.close();
		} catch (IOException e) {
			// TODO ×Ô¶¯Éú³ÉµÄ catch ¿é
			e.printStackTrace();
		}
        
		
	}

}