java bytebuffer flip_java string转byte

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import java.nio.ByteBuffer;  
import java.nio.ByteOrder;  
public class bytebuffertest {  
  
    public static void main(String[] args)  
    {  
        // Create a ByteBuffer using a byte array   
        byte[] bytes = new byte[10];  
        ByteBuffer buf = ByteBuffer.wrap(bytes);  
  
        // Create a non-direct ByteBuffer with a 10 byte capacity   
        // The underlying storage is a byte array.   
        buf = ByteBuffer.allocate(10);  
  
        // Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.   
        buf = ByteBuffer.allocateDirect(10);  
  
          
        // Create an empty ByteBuffer with a 10 byte capacity   
        ByteBuffer bbuf = ByteBuffer.allocate(10);  
  
        // Get the ByteBuffer's capacity   
        int capacity = bbuf.capacity(); // 10   
        System.out.println(capacity);  
  
        // Use the absolute get().   
        // This method does not affect the position.   
        byte b = bbuf.get(5); // position=0   
  
        // Set the position   
        bbuf.position(5);  
  
        // Use the relative get()   
        b = bbuf.get();  
  
        // Get the new position   
        int pos = bbuf.position(); // 6   
  
        // Get remaining byte count   
        int rem = bbuf.remaining(); // 4   
  
        // Set the limit   
        bbuf.limit(7); // remaining=1   
  
        // This convenience method sets the position to 0   
        bbuf.rewind(); // remaining=7   
          
        //Converting Between a ByteBuffer an a Byte Array    
  
        // Create a ByteBuffer from a byte array   
        byte[] bytes1 = new byte[10];  
        ByteBuffer buf1 = ByteBuffer.wrap(bytes);  
  
        // Retrieve bytes between the position and limit   
        // (see Putting Bytes into a ByteBuffer)   
        bytes1 = new byte[buf.remaining()];  
        buf1.get(bytes1, 0, bytes1.length);  
  
        // Retrieve all bytes in the buffer   
        buf1.clear();  
        bytes1 = new byte[buf1.capacity()];  
        buf1.get(bytes1, 0, bytes1.length);  
          
        // Use the absolute put().   
        // This method does not affect the position.   
        bbuf.put((byte)0xFF); // position=0   
  
        // Set the position   
        bbuf.position(5);  
  
        // Use the relative put()   
        bbuf.put((byte)0xFF);  
  
        // Get the new position   
        int pos1 = bbuf.position(); // 6   
          
          
        //Setting the Byte Ordering for a ByteBuffer    
        // Get default byte ordering   
        ByteOrder order = buf.order(); // ByteOrder.BIG_ENDIAN   
  
        // Put a multibyte value   
        buf.putShort(0, (short)123);  
        buf.get(0); // 0   
        buf.get(1); // 123   
  
        // Set to little endian   
        buf.order(ByteOrder.LITTLE_ENDIAN);  
  
        // Put a multibyte value   
        buf.putShort(0, (short)123);  
        buf.get(0); // 123   
        buf.get(1); // 0   
  
  
  
    }  
} 

这是一篇转载的博客我还没有来得及进行验证，放在这里只是为了以后自己方便查看，如有错误的地方还请以评论的方式告知，我会进行改正。