利用Netty的ChannelBuffer自定义序列化
利用Netty的ChannelBuffer自定义序列化
先定义ChannelBuffer工厂
package com.shux.common.serializer;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
/**
* ChannelBuffer工厂
* @author Simba.hua
*
*/
public class BufferFactory {
public static ChannelBuffer getBuffer(byte [] bytes){
ChannelBuffer buffer = ChannelBuffers.copiedBuffer(bytes);
return buffer;
}
public static ChannelBuffer getBuffer(){
ChannelBuffer writeBuffer = ChannelBuffers.dynamicBuffer();
return writeBuffer;
}
}package com.shux.common.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;
/**
* 自定义序列化类
* @author Simba.hua
*
*/
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 List readList(Class clz) {
List list = new ArrayList<>();
int size = readBuffer.readShort();
for (int i = 0; i < size; i++) {
list.add(read(clz));
}
return list;
}
public Map readMap(Class keyClz, Class valueClz) {
Map 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 read(Class 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 Serializer writeList(List list) {
if (isEmpty(list)) {
writeBuffer.writeShort((short) 0);
return this;
}
writeBuffer.writeShort((short) list.size());
for (T item : list) {
writeObject(item);
}
return this;
}
public Serializer writeMap(Map map) {
if (isEmpty(map)) {
writeBuffer.writeShort((short) 0);
return this;
}
writeBuffer.writeShort((short) map.size());
for (Entry 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 boolean isEmpty(Collection c) {
return c == null || c.size() == 0;
}
public boolean isEmpty(Map c) {
return c == null || c.size() == 0;
}
} package com.shux.common.serializer;
public class Grade extends Serializer{
private int gradeId;
private String gradeName;
public int getGradeId() {
return gradeId;
}
public void setGradeId(int gradeId) {
this.gradeId = gradeId;
}
public String getGradeName() {
return gradeName;
}
public void setGradeName(String gradeName) {
this.gradeName = gradeName;
}
@Override
protected void read() {
this.gradeId = readInt();
this.gradeName = readString();
}
@Override
protected void write() {
writeInt(gradeId);
writeString(gradeName);
}
}
package com.shux.common.serializer;
public class Student extends Serializer {
private int studentId;
private String name;
private int age;
private Grade grade;
@Override
protected void read() {
this.studentId = readInt();
this.name = readString();
this.age = readInt();
this.grade = read(Grade.class);
}
@Override
protected void write() {
writeInt(studentId);
writeString(name);
writeInt(age);
writeObject(grade);
}
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Grade getGrade() {
return grade;
}
public void setGrade(Grade grade) {
this.grade = grade;
}
}
package com.shux.common.serializer;
import java.util.Arrays;
import org.junit.Test;
public class MySerializerTest {
@Test
public void testSerializser(){
Grade grade = new Grade();
grade.setGradeId(10);
grade.setGradeName("班级1");
Student student = new Student();
student.setGrade(grade);
student.setStudentId(100);
student.setName("华晨曦");
student.setAge(2);
byte [] bytes = student.getBytes();
//序列化后的数组
System.out.println(Arrays.toString(bytes));
//反序列化
Student student1 = (Student) student.readFromBytes(bytes);
System.out.println("studentID:"+student.getStudentId() +" name:"+student1.getName()+" age:"+student1.getAge()
+" gradeId:"+student1.getGrade().getGradeId()+" gradeName:"+student1.getGrade().getGradeName());
}
}
结果输出：
[0, 0, 0, 100, 0, 9, -27, -115, -114, -26, -103, -88, -26, -101, -90, 0, 0, 0, 2, 1, 0, 0, 0, 10, 0, 7, -25, -113, -83, -25, -70, -89, 49]
studentID:100 name:华晨曦 age:2 gradeId:10 gradeName:班级1