ProtoBuf，全稱是Protocol Buffers, 它是谷歌內部用的一種高效的、可擴展的對結構化數據進行編碼的格式規范。谷歌自己內部很多程序之間的通信協議都用了ProtoBuf。
下面介紹的是使用Java ProtoBuf的基本步驟：
1.http://code.google.com/p/protobuf/downloads/list ，選擇其中的win版本下載
2.下載一個protobuf-java-2.4.1.jar文件（注意，要與你剛才下的proto.exe版本相同，否則可能出現編譯通不過現象）
http://grepcode.com/snapshot/repo1.maven.org/maven2/com.google.protobuf/protobuf-java/2.4.1
3.在proto.exe同級目錄，編寫一個msg.proto文件：
package tutorial;
option java_package = "com.protobuftest.protobuf";
option java_outer_classname = "PersonProbuf";
message Person {
required string name = 1;
required int32 id = 2;
optional string email = 3;
enum PhoneType {
MOBILE = 0;
HOME = 1;
WORK = 2;
}
message PhoneNumber {
required string number = 1;
optional PhoneType type = 2 [default = HOME];
}
repeated PhoneNumber phone = 4;
message CountryInfo {
required string name = 1;
required string code = 2;
optional int32 number = 3;
}
}
message AddressBook {
repeated Person person = 1;
}
4.使用如下命令編譯這個文件：
5.將生成的ProtoBufferPractice.java文件引入eclipse
6.把下載的protobuf-java-2.4.1.jar也引入工程
7.使用方法：
package com.protobuftest;
import java.util.List;
import com.google.protobuf.InvalidProtocolBufferException;
import com.protobuftest.protobuf.PersonProbuf;
import com.protobuftest.protobuf.PersonProbuf.Person;
import com.protobuftest.protobuf.PersonProbuf.Person.PhoneNumber;
import com.protobuftest.protobuf.PersonProbuf.Person.PhoneNumberOrBuilder;
import com.protobuftest.protobuf.PersonProbuf.Person.PhoneType;
public class ProtoBufTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
PersonProbuf.Person.Builder builder = PersonProbuf.Person.newBuilder();
builder.setEmail("kkk@email.com");
builder.setId(1);
builder.setName("TestName");
builder.addPhone(PersonProbuf.Person.PhoneNumber.newBuilder().setNumber("131111111").setType(PersonProbuf.Person.PhoneType.MOBILE));
builder.addPhone(PersonProbuf.Person.PhoneNumber.newBuilder().setNumber("011111").setType(PersonProbuf.Person.PhoneType.HOME));
Person person = builder.build();
byte[] buf = person.toByteArray();
try {
Person person2 = PersonProbuf.Person.parseFrom(buf);
System.out.println(person2.getName() + ", " + person2.getEmail());
List<PhoneNumber> lstPhones = person2.getPhoneList();
for (PhoneNumber phoneNumber : lstPhones) {
System.out.println(phoneNumber.getNumber());
}
} catch (InvalidProtocolBufferException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(buf);
}
}