（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 = 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; 
} 

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(1);
        builder.setName("筱灬湘子");
        builder.addPhone(PersonProbuf.Person.PhoneNumber.newBuilder().setNumber("1001").setType(PersonProbuf.Person.PhoneType.MOBILE));
        builder.addPhone(PersonProbuf.Person.PhoneNumber.newBuilder().setNumber("1002").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：