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google的protocol buffers 对象的序列化 for java
前言:
protobuf确实比JSON快很多倍,看下面的图就知道了。
环境:
win7 x64
eclipse 4.3
protoc-2.5.0
安装包下载:
https://code.google.com/p/protobuf/downloads/list
2.6+的版本已转到GitHub上,下载地址是:
https://github.com/google/protobuf/releases
1.生成jar包
下载ProtoBuf包和生成protobuf-2.5.0.jar文件。下载protoc-2.5.0-win32.zip和protobuf-2.5.0.zip,两个文件都解压缩,将protoc-2.5.0-win32中的protoc.exe文件拷贝到protobuf-2.5.0\src目录下,然后进入protobuf-2.5.0\java,执行 mvn install,编译完成后可以在protobuf-2.5.0\java\target目录中找到protobuf-2.5.0.jar文件。
2.建立eclipse项目
a. protoc.exe 放在工程的根目录下面
b. protobuf-java-2.5.0.jar 放在lib下面
c. 新建一个文件夹proto存放proto文件
d. 在proto文件夹下新建一个文件msg.proto,写入以下内容:
option java_package = "com.jamesfen.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; }
3.产生protobuf JAVA类
进入 cd E:/Git/myhadoop2.x/myhadoop2.x文件夹
执行:
protoc --java_out=./src/main/java ./proto/msg.proto
在包package com.jamesfen.protobuf;下面会找到类PersonProbuf
4.序列化反序列化测试:
package com.jamesfen.protobuf; import java.util.List; import com.google.protobuf.InvalidProtocolBufferException; import com.jamesfen.protobuf.PersonProbuf; import com.jamesfen.protobuf.PersonProbuf.Person; import com.jamesfen.protobuf.PersonProbuf.Person.PhoneNumber; public class TestProtobuf { /** * @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); } }
5. 输出:
TestName, kkk@email.com
131111111
011111
[B@472a2a50
6.demo源码下载
https://github.com/Bellonor/myhadoop2.x
google的protocol buffers 对象的序列化 for java