The serialization of Google's protocol buffers object for Java

Objective:

Protobuf is really many times faster than JSON, see the figure below.

Environment:

Win7 x64

Eclipse 4.3

protoc-2.5.0

Install package Download:

Https://code.google.com/p/protobuf/downloads/list

The 2.6+ version has been transferred to GitHub and is:

Https://github.com/google/protobuf/releases

1. Build the JAR Package

Download the PROTOBUF package and generate the Protobuf-2.5.0.jar file. Download Protoc-2.5.0-win32.zip and Protobuf-2.5.0.zip, two files are uncompressed, copy protoc.exe files from Protoc-2.5.0-win32 to protobuf-2.5.0\src directory , then go to Protobuf-2.5.0\java, execute mvn install, and the Protobuf-2.5.0.jar file can be found in the Protobuf-2.5.0\java\target directory after the compilation is complete.

2. Building the Eclipse Project

A. Protoc.exe placed under the project's root directory

B. Protobuf-java-2.5.0.jar is placed under Lib

C. Create a new folder Proto store proto file

D. Create a new file Msg.proto under the Proto folder and write the following:

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. Generate Protobuf Java class

Go to CD e:/git/myhadoop2.x/myhadoop2.x folder

Perform:

Protoc--java_out=./src/main/java./proto/msg.proto

in packages package com.jamesfen.protobuf; The following will find the class Personprobuf

4. Serialization of the deserialization test:

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 StubPersonProbuf.Person.Builder Builder = PersonProbuf.Person.newBuilder (); Builder.setemail ("[email protected]"); 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 Blocke.printstacktrace ();} System.out.println (BUF);}}

5. Output:

testname, [email protected]
131111111
011111
[[Email protected]

6.demo Source Download

https://github.com/Bellonor/myhadoop2.x

The serialization of Google's protocol buffers object for Java