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2024-01-02 7b595546af704983dbafcd0d385c8768ddacefc2

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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();
        }
        
        
    }
 
}