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使用位移 与大小端存储对象。
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
public class Test1 {
public static void main(String[] args) throws IOException {
int id = 101;
int age = 21;
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
arrayOutputStream.write(int2bytes(id));
arrayOutputStream.write(int2bytes(age));
byte[] byteArray = arrayOutputStream.toByteArray();
System.out.println(Arrays.toString(byteArray));
//==============================================================
ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(byteArray);
byte[] idBytes = new byte[4];
arrayInputStream.read(idBytes);
System.out.println("id:" + bytes2int(idBytes));
byte[] ageBytes = new byte[4];
arrayInputStream.read(ageBytes);
System.out.println("age:" + bytes2int(ageBytes));
}
/**
* 大端字节序列(先写高位，再写低位)
* 百度下 大小端字节序列
* @param i
* @return
*/
public static byte[] int2bytes(int i){
byte[] bytes = new byte[4];
bytes[0] = (byte)(i >> 3*8);
bytes[1] = (byte)(i >> 2*8);
bytes[2] = (byte)(i >> 1*8);
bytes[3] = (byte)(i >> 0*8);
return bytes;
}
/**
* 大端
* @param bytes
* @return
*/
public static int bytes2int(byte[] bytes){
return (bytes[0] << 3*8) |
(bytes[1] << 2*8) |
(bytes[2] << 1*8) |
(bytes[3] << 0*8);
}
}import java.nio.ByteBuffer;
import java.util.Arrays;
public class Test2 {
public static void main(String[] args) {
int id = 101;
int age = 21;
ByteBuffer buffer = ByteBuffer.allocate(8);
buffer.putInt(id);
buffer.putInt(age);
byte[] array = buffer.array();
System.out.println(Arrays.toString(buffer.array()));
//====================================================
ByteBuffer buffer2 = ByteBuffer.wrap(array);
System.out.println("id:"+buffer2.getInt());
System.out.println("age:"+buffer2.getInt());
}
}import java.util.Arrays;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
public class Test3 {
public static void main(String[] args) {
ChannelBuffer buffer = ChannelBuffers.dynamicBuffer();
buffer.writeInt(101);
buffer.writeDouble(80.1);
byte[] bytes = new byte[buffer.writerIndex()];
buffer.readBytes(bytes);
System.out.println(Arrays.toString(bytes));
System.out.println("abc".getBytes());
//================================================
ChannelBuffer wrappedBuffer = ChannelBuffers.wrappedBuffer(bytes);
System.out.println(wrappedBuffer.readInt());
System.out.println(wrappedBuffer.readDouble());
}
}Serializer
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.jboss.netty.buffer.ChannelBuffer;
/**
* 自定义序列化接口
*
*
*/
public abstract class Serializer {
public static final Charset CHARSET = Charset.forName("UTF-8");
protected ChannelBuffer writeBuffer;
protected ChannelBuffer readBuffer;
/**
* 反序列化具体实现
*/
protected abstract void read();
/**
* 序列化具体实现
*/
protected abstract void write();
/**
* 从byte数组获取数据
* @param bytes 读取的数组
*/
public Serializer readFromBytes(byte[] bytes) {
readBuffer = BufferFactory.getBuffer(bytes);
read();
readBuffer.clear();
return this;
}
/**
* 从buff获取数据
* @param readBuffer
*/
public void readFromBuffer(ChannelBuffer readBuffer) {
this.readBuffer = readBuffer;
read();
}
/**
* 写入本地buff
* @return
*/
public ChannelBuffer writeToLocalBuff(){
writeBuffer = BufferFactory.getBuffer();
write();
return writeBuffer;
}
/**
* 写入目标buff
* @param buffer
* @return
*/
public ChannelBuffer writeToTargetBuff(ChannelBuffer buffer){
writeBuffer = buffer;
write();
return writeBuffer;
}
/**
* 返回buffer数组
*
* @return
*/
public byte[] getBytes() {
writeToLocalBuff();
byte[] bytes = null;
if (writeBuffer.writerIndex() == 0) {
bytes = new byte[0];
} else {
bytes = new byte[writeBuffer.writerIndex()];
writeBuffer.readBytes(bytes);
}
writeBuffer.clear();
return bytes;
}
public byte readByte() {
return readBuffer.readByte();
}
public short readShort() {
return readBuffer.readShort();
}
public int readInt() {
return readBuffer.readInt();
}
public long readLong() {
return readBuffer.readLong();
}
public float readFloat() {
return readBuffer.readFloat();
}
public double readDouble() {
return readBuffer.readDouble();
}
public String readString() {
int size = readBuffer.readShort();
if (size <= 0) {
return "";
}
byte[] bytes = new byte[size];
readBuffer.readBytes(bytes);
return new String(bytes, CHARSET);
}
public <T> List<T> readList(Class<T> clz) {
List<T> list = new ArrayList<>();
int size = readBuffer.readShort();
for (int i = 0; i < size; i++) {
list.add(read(clz));
}
return list;
}
public <K,V> Map<K,V> readMap(Class<K> keyClz, Class<V> valueClz) {
Map<K,V> map = new HashMap<>();
int size = readBuffer.readShort();
for (int i = 0; i < size; i++) {
K key = read(keyClz);
V value = read(valueClz);
map.put(key, value);
}
return map;
}
@SuppressWarnings("unchecked")
public <I> I read(Class<I> clz) {
Object t = null;
if ( clz == int.class || clz == Integer.class) {
t = this.readInt();
} else if (clz == byte.class || clz == Byte.class){
t = this.readByte();
} else if (clz == short.class || clz == Short.class){
t = this.readShort();
} else if (clz == long.class || clz == Long.class){
t = this.readLong();
} else if (clz == float.class || clz == Float.class){
t = readFloat();
} else if (clz == double.class || clz == Double.class){
t = readDouble();
} else if (clz == String.class ){
t = readString();
} else if (Serializer.class.isAssignableFrom(clz)){
try {
byte hasObject = this.readBuffer.readByte();
if(hasObject == 1){
Serializer temp = (Serializer)clz.newInstance();
temp.readFromBuffer(this.readBuffer);
t = temp;
}else{
t = null;
}
} catch (Exception e) {
e.printStackTrace();
}
} else {
throw new RuntimeException(String.format("不支持类型:[%s]", clz));
}
return (I) t;
}
public Serializer writeByte(Byte value) {
writeBuffer.writeByte(value);
return this;
}
public Serializer writeShort(Short value) {
writeBuffer.writeShort(value);
return this;
}
public Serializer writeInt(Integer value) {
writeBuffer.writeInt(value);
return this;
}
public Serializer writeLong(Long value) {
writeBuffer.writeLong(value);
return this;
}
public Serializer writeFloat(Float value) {
writeBuffer.writeFloat(value);
return this;
}
public Serializer writeDouble(Double value) {
writeBuffer.writeDouble(value);
return this;
}
public <T> Serializer writeList(List<T> list) {
if (isEmpty(list)) {
writeBuffer.writeShort((short) 0);
return this;
}
writeBuffer.writeShort((short) list.size());
for (T item : list) {
writeObject(item);
}
return this;
}
public <K,V> Serializer writeMap(Map<K, V> map) {
if (isEmpty(map)) {
writeBuffer.writeShort((short) 0);
return this;
}
writeBuffer.writeShort((short) map.size());
for (Entry<K, V> entry : map.entrySet()) {
writeObject(entry.getKey());
writeObject(entry.getValue());
}
return this;
}
public Serializer writeString(String value) {
if (value == null || value.isEmpty()) {
writeShort((short) 0);
return this;
}
byte data[] = value.getBytes(CHARSET);
short len = (short) data.length;
writeBuffer.writeShort(len);
writeBuffer.writeBytes(data);
return this;
}
public Serializer writeObject(Object object) {
if(object == null){
writeByte((byte)0);
}else{
if (object instanceof Integer) {
writeInt((int) object);
return this;
}
if (object instanceof Long) {
writeLong((long) object);
return this;
}
if (object instanceof Short) {
writeShort((short) object);
return this;
}
if (object instanceof Byte) {
writeByte((byte) object);
return this;
}
if (object instanceof String) {
String value = (String) object;
writeString(value);
return this;
}
if (object instanceof Serializer) {
writeByte((byte)1);
Serializer value = (Serializer) object;
value.writeToTargetBuff(writeBuffer);
return this;
}
throw new RuntimeException("不可序列化的类型:" + object.getClass());
}
return this;
}
private <T> boolean isEmpty(Collection<T> c) {
return c == null || c.size() == 0;
}
public <K,V> boolean isEmpty(Map<K,V> c) {
return c == null || c.size() == 0;
}
}BufferFactory
import java.nio.ByteOrder;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
/**
* buff工厂
*
*
*/
public class BufferFactory {
public static ByteOrder BYTE_ORDER = ByteOrder.BIG_ENDIAN;
/**
* 获取一个buffer
*
* @return
*/
public static ChannelBuffer getBuffer() {
ChannelBuffer dynamicBuffer = ChannelBuffers.dynamicBuffer();
return dynamicBuffer;
}
/**
* 将数据写入buffer
* @param bytes
* @return
*/
public static ChannelBuffer getBuffer(byte[] bytes) {
ChannelBuffer copiedBuffer = ChannelBuffers.copiedBuffer(bytes);
return copiedBuffer;
}
}Player
import java.util.ArrayList;
import java.util.List;
import com.cn.core.Serializer;
public class Player extends Serializer{
private long playerId;
private int age;
private List<Integer> skills = new ArrayList<>();
private Resource resource = new Resource();
public Resource getResource() {
return resource;
}
public void setResource(Resource resource) {
this.resource = resource;
}
public long getPlayerId() {
return playerId;
}
public void setPlayerId(long playerId) {
this.playerId = playerId;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public List<Integer> getSkills() {
return skills;
}
public void setSkills(List<Integer> skills) {
this.skills = skills;
}
@Override
protected void read() {
this.playerId = readLong();
this.age = readInt();
this.skills = readList(Integer.class);
this.resource = read(Resource.class);
}
@Override
protected void write() {
writeLong(playerId);
writeInt(age);
writeList(skills);
writeObject(resource);
}
}Resource
import com.cn.core.Serializer;
public class Resource extends Serializer {
private int gold;
public int getGold() {
return gold;
}
public void setGold(int gold) {
this.gold = gold;
}
@Override
protected void read() {
this.gold = readInt();
}
@Override
protected void write() {
writeInt(gold);
}
}Test4
import java.util.Arrays;
public class Test4 {
public static void main(String[] args) {
Player player = new Player();
player.setPlayerId(10001);
player.setAge(22);
player.getSkills().add(101);
player.getResource().setGold(99999);
byte[] bytes = player.getBytes();
System.out.println(Arrays.toString(bytes));
//==============================================
Player player2 = new Player();
player2.readFromBytes(bytes);
System.out.println(player2.getPlayerId() + " " + player2.getAge() + " " + Arrays.toString(player2.getSkills().toArray()) + " " + player2.getResource().getGold());
}
}