NOTE
3.10 序列化协议
什么是序列化 序列化是将一个数据结构或者对象转换为连续的比特位的操作，进而可以将转换后的数据存储在一个文件或者内存中，同时也可以通过网络传输到另一个计算机环境 自定义规则 使用ByteBuffer，遵循如下规则 例子
这是历史学习笔记，可能存在过时或不完整的理解。
什么是序列化
序列化是将一个数据结构或者对象转换为连续的比特位的操作，进而可以将转换后的数据存储在一个文件或者内存中，同时也可以通过网络传输到另一个计算机环境
自定义规则
使用ByteBuffer，遵循如下规则
例子
package com.cn.core;
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;
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;
}
}
package com.cn.core;
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
* @author -琴兽-
*
*/
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;
}
}