（一）Protobuf的Java使用

学习使用Protobuf，创建java文件

windows :

步骤一：两个文件：proto.exe,  protobuf-Java-2.4.1.jar

步骤二：建立一个工程CreateProtoBuf，在下面建立一个proto文件件，用来存放【proto】文件

步骤三：将proto,exe放在工程下，

步骤四：建立一个msg.proto文件：

 option java_package = "com.protobuftest.protobuf";
 option java_outer_classname = "PersonProbuf"; 

 message Person
 {
   required string name = ;
   required int32 id = ;
   optional string email = ; 

   enum PhoneType
   {
     MOBILE = ;
     HOME = ;
     WORK = ;
   } 

   message PhoneNumber
   {
     required string number = ;
     optional PhoneType type =  [default = HOME];
   } 

   repeated PhoneNumber phone = ; 

   message CountryInfo
   {
           required string name = ;
           required string code = ;
           optional int32 number = ;
   }
 } 

 message AddressBook
  {
   repeated Person person = ;
 } 

步骤五：生成 java文件：在proto.exe目录下：protoc  --java_out=./src   ./proto/msg.proto

步骤六：测试实例

 package com.protobuftest.protobuf;

 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;

 public class Test
 {
     /**
      * @param args
      */
     public static void main(String[] args)
     {
         PersonProbuf.Person.Builder builder = PersonProbuf.Person.newBuilder();
         builder.setEmail("xiaoxiangzi@email.com");
         builder.setId();
         builder.setName("筱灬湘子");
         builder.addPhone(PersonProbuf.Person.PhoneNumber.newBuilder().setNumber("").setType(PersonProbuf.Person.PhoneType.MOBILE));
         builder.addPhone(PersonProbuf.Person.PhoneNumber.newBuilder().setNumber("").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)
         {
             e.printStackTrace();
         }

         System.out.println(buf);
     }
 }

工程目录如下：