Google Protocol Buffers

Google Protocol Buffers Helloworld(Java)

Categories: Java; Tagged with: Google • Google Protocol Buffers • Java; @ July 3rd, 2014 0:15

This is a Protocol Buffers hello world project following https://developers.google.com/protocol-buffers/docs/javatutorial

you may find all source code from github: https://github.com/guoliang-dev/google-protocol-buffers-java-helloworld

Code Generation

The message definition: addressbook.proto;

D:\dev\tools\protoc-2.5.0-win32>protoc.exe -I=D:\dev\..\src\main\resosurce\ --java_out=D:\dev..\src\main\java  D:\dev\…\resosurce\addressbook.proto

AddressBookProtos.java is the generated Java class;

TestCase:

package com.liguoliang.java.protobuf;
public class ProtocolBuffersTest {
     private static final String name = "google";
    @Test
     public void testBuildInstance() throws Exception {
         Person person = buildNewPerson();
         assertEquals(name, person.getName());
     }
    @Test
     public void testWriteInstanceToFile() throws Exception {
         String path = "./src/test/resources/address.txt";
         AddressBook.Builder addressBookBuilder = AddressBook.newBuilder();
         addressBookBuilder.addPerson(buildNewPerson());
         AddressBook addressBook = addressBookBuilder.build();
         FileOutputStream outputStream = new FileOutputStream(path);
         addressBook.writeTo(outputStream);
         outputStream.close();
         System.out.println("AddressBook write to :\n " + path);
         URL url = Resources.getResource("./address.txt");
         String contentInFile = Resources.toString(url, Charsets.UTF_8);
         assertTrue(contentInFile.contains(name));
     }
     @Test
     public void testParseInstanceFromFile() throws FileNotFoundException, IOException {
         AddressBook.Builder addressBookBuilderRead = AddressBook.newBuilder();
         addressBookBuilderRead.mergeFrom(new FileInputStream("./src/test/resources/address-test.txt"));
         AddressBook addressBookRead = addressBookBuilderRead.build();
         System.out.println("AddressBook loaded: \n" + addressBookRead.toString());
         assertEquals(1, addressBookRead.getPersonCount());
         Person person = addressBookRead.getPerson(0);
         assertEquals(name, person.getName());
     }
     private Person buildNewPerson() {
         Person.Builder personBuilder = Person.newBuilder();
         personBuilder.setId(1);
         personBuilder.setName(name);
         Person person = personBuilder.build();
         return person;
     }
}