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;

}

}