关于数据序列化（1）protobuf 示例

最近用protobuf来做对象的序列化（不知道我这么表达对不对），用的是百度的jprotobuf，使用注解，当然还有不使用注解的经典方式，本人没用过，发现工作中的竟然在JDK7报错（真怀疑为啥生产用JDK6，现在JDK8了都）只好在github下了最新的，当然google的jar包仍然是必须的

不过有个疑问，protobuf的好处仅仅是为了提供一个兼容跨平台的格式吗，，既然最后都是讲对象存为byte[]，那直接用流操作使用writeByte()，writeInt(),writeUTf(),写进byte[]里存入文件或数据库有区别么？什么情况下使用protobuf时最佳应用场景？客户端服务器通信?还是其他？

——————————————————依赖的包—————————————————————

jprotobuf-1.2.9.jar

地址点击打开链接

protobuf-0.0.3-beta1.jarprotobuf-java-2.6.1.jarjprotobuf-1.2.9.jar

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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;}@Overridepublic 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;}@Overridepublic 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;/** * 写 */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;/** * 这个是为了读 */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);}}

可就是这样，还是有人，期望过多的温暖。