ByteUtil

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.UnsupportedEncodingException;

import java.nio.ByteBuffer;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

public class ByteUtil

{

  private static final Logger LOGGER = LoggerFactory.getLogger(ByteUtil.class);

  public static String getString(ByteBuffer byteBuffer)

  {

    short len = byteBuffer.getShort();

    byte[] bb = new byte[len];

    byteBuffer.get(bb);

    String str = null;

    try {

      str = new String(bb, "UTF-8");

    } catch (UnsupportedEncodingException e) {

      LOGGER.error("读取字符串错误.");

    }

    return str;

  }

  public static byte[] mergeByteArray(byte[] bb1, byte[] bb2)

  {

    int len1 = bb1.length;

    int len2 = bb2.length;

    byte[] bb = new byte[len1 + len2];

    System.arraycopy(bb1, 0, bb, 0, len1);

    System.arraycopy(bb2, 0, bb, len1, len2);

    return bb;

  }

  public static byte[] booleanToBytes(boolean b)

  {

    byte[] bb = new byte[1];

    bb[0] = (byte)((b) ? 1 : 0);

    return bb;

  }

  public static byte[] byteToBytes(byte b)

  {

    byte[] bb = new byte[1];

    bb[0] = b;

    return bb;

  }

  public static byte[] shortToBytes(short s)

  {

    ByteBuffer byteBuffer = ByteBuffer.allocate(2);

    byteBuffer.putShort(s);

    byteBuffer.flip();

    byte[] bb = new byte[byteBuffer.limit()];

    byteBuffer.get(bb);

    return bb;

  }

  public static byte[] intToBytes(int i)

  {

    ByteBuffer byteBuffer = ByteBuffer.allocate(4);

    byteBuffer.putInt(i);

    byteBuffer.flip();

    byte[] bb = new byte[byteBuffer.limit()];

    byteBuffer.get(bb);

    return bb;

  }

  public static byte[] longToBytes(long l)

  {

    ByteBuffer byteBuffer = ByteBuffer.allocate(8);

    byteBuffer.putLong(l);

    byteBuffer.flip();

    byte[] bb = new byte[byteBuffer.limit()];

    byteBuffer.get(bb);

    return bb;

  }

  public static byte[] stringToBytes(String s)

  {

    byte[] bb = null;

    try {

      bb = s.getBytes("UTF-8");

    } catch (UnsupportedEncodingException e) {

      e.printStackTrace();

    }

    return bb;

  }

  public static <T> T byteArrayToObject(byte[] bb)

  {

    Object obj = null;

    ByteArrayInputStream bais = null;

    ObjectInputStream ois = null;

    try {

      bais = new ByteArrayInputStream(bb);

      ois = new ObjectInputStream(bais);

      obj = ois.readObject();

    } catch (Exception e) {

      e.printStackTrace(); } finally {

      try {

        if (ois != null) ois.close();  } catch (IOException e) {

        e.printStackTrace();

      }try { if (bais != null) bais.close();  } catch (IOException e) {

        e.printStackTrace();

      }

    }

    return obj;

  }

  public static byte[] objectToByteArray(Object obj)

  {

    byte[] bb = null;

    ByteArrayOutputStream baos = new ByteArrayOutputStream();

    ObjectOutputStream oos = null;

    try {

      oos = new ObjectOutputStream(baos);

      oos.writeObject(obj);

      bb = baos.toByteArray();

    } catch (Exception e) {

      e.printStackTrace(); } finally {

      try {

        if (oos != null) oos.close();  } catch (IOException e) {

        e.printStackTrace();

      }try { if (baos != null) baos.close();  } catch (IOException e) {

        e.printStackTrace();

      }

    }

    return bb;

  }

}