最近用protobuf來做對象的序列化(不知道我這麼表達對不對),用的是百度的jprotobuf,使用註解,當然還有不使用註解的經典方式,本人沒用過,發現工作中的竟然在JDK7報錯(真懷疑爲啥生產用JDK6,現在JDK8了都)只好在github下了最新的,當然google的jar包仍然是必須的
不過有個疑問,protobuf的好處僅僅是爲了提供一個兼容跨平臺的格式嗎,既然最後都是講對象存爲byte[],那直接用流操作使用writeByte(),writeInt(),writeUTf(),寫進byte[]裏存入文件或數據庫有區別麼?什麼情況下使用protobuf時最佳應用場景?客戶端服務器通信?還是其他?
------------------------------------------------------依賴的包---------------------------------------------------------------
jprotobuf-1.2.9.jar
地址點擊打開鏈接
protobuf-0.0.3-beta1.jar
protobuf-java-2.6.1.jar
jprotobuf-1.2.9.jar
---------------------------------------------------------------------------------------------------------------------
package a_serial.protobuf;
import org.apache.commons.lang.builder.ReflectionToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import com.baidu.bjf.remoting.protobuf.FieldType;
import com.baidu.bjf.remoting.protobuf.annotation.Protobuf;
public class GoodsRecord {
@Protobuf(fieldType = FieldType.INT32, order = 1)
private int goodsId;
@Protobuf(fieldType = FieldType.INT32, order = 2)
private int num;
public GoodsRecord(){
super();
}
public GoodsRecord(int goodsId, int num) {
super();
this.goodsId = goodsId;
this.num = num;
}
/*
* getters and setters
*/
public int getGoodsId() {
return goodsId;
}
public void setGoodsId(int goodsId) {
this.goodsId = goodsId;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
@Override
public String toString() {
return ReflectionToStringBuilder.toString(this, ToStringStyle.SHORT_PREFIX_STYLE);
}
}
-----------------------------------------------------------------------------
package a_serial.protobuf;
import java.io.IOException;
import java.util.List;
import org.apache.commons.lang.builder.ReflectionToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import com.baidu.bjf.remoting.protobuf.Codec;
import com.baidu.bjf.remoting.protobuf.FieldType;
import com.baidu.bjf.remoting.protobuf.ProtobufProxy;
import com.baidu.bjf.remoting.protobuf.annotation.Protobuf;
public class Shop{
@Protobuf(fieldType = FieldType.STRING, order = 1)
private String shopId;
private byte[] data;
@Protobuf(fieldType = FieldType.OBJECT, order = 2)
private List<GoodsRecord> goodsRecordList;
public Shop(){
super();
}
public byte[] getData(){
return data;
}
public String getShopId() {
return shopId;
}
public void setShopId(String shopId) {
this.shopId = shopId;
}
public List<GoodsRecord> getGoodsRecordList() {
return goodsRecordList;
}
public void setGoodsRecordList(List<GoodsRecord> goodsRecordList) {
this.goodsRecordList = goodsRecordList;
}
private Shop parseData(byte[] targetData)
throws IOException {
Codec<Shop> codec = ProtobufProxy.create(Shop.class);
return codec.decode(targetData) ;
}
private byte[] buildData() {
try {
Codec<Shop> codec = ProtobufProxy.create(Shop.class);
return codec.encode(this);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
public void preToData() {
this.data = buildData();
}
public Shop postFromData() {
Shop s = null;
try {
s = parseData(this.data);
this.shopId = s.getShopId();
this.goodsRecordList = s.getGoodsRecordList();
} catch (IOException e) {
e.printStackTrace();
}
return s;
}
public Shop initFromData(byte[] data) {
Shop s = null;
try {
s = parseData(data);
this.shopId = s.getShopId();
this.goodsRecordList = s.getGoodsRecordList();
} catch (IOException e) {
e.printStackTrace();
}
return s;
}
@Override
public String toString() {
return ReflectionToStringBuilder.toString(this, ToStringStyle.SHORT_PREFIX_STYLE);
}
}
-------------------------------------------------------------------------------------------------
package a_serial.protobuf;
import java.io.IOException;
import java.util.ArrayList;
import a_serial.ByteUtil;
import com.google.common.collect.Lists;
/**
* 寫
*/
public class ProtoBufTest {
public static void main(String[] args) {
Shop shop = new Shop();
shop.setShopId("10010");
GoodsRecord r = new GoodsRecord(3, 22);
GoodsRecord r2 = new GoodsRecord(4, 22);
ArrayList<GoodsRecord> goodsRecordList = Lists.newArrayList(r, r2);
shop.setGoodsRecordList(goodsRecordList);
shop.preToData();
byte[] data = shop.getData();
try {
ByteUtil.writeFile(data, "protoBuf.os");
} catch (IOException e) {
e.printStackTrace();
}
}
}
--------------------------------------------------------------------------------
package a_serial.protobuf;
import a_serial.ByteUtil;
/**
* 這個是爲了讀
*/
public class ProtoBufTest2 {
public static void main(String[] args) {
Shop shop = new Shop();
try {
byte[] data = ByteUtil.getData("protoBuf.os");
shop.initFromData(data);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(shop);
}
}