java - 如何从protoc.exe获取类文件

Question

我第一次尝试使用 Protocol Buffer 。我正在遵循谷歌提供的教程。我制作的*.proto如下:

    package tutorial;
option java_package = "com.example.tutorial";
option java_outer_classname = "AddressBookProtos";

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 AddressBook {
  repeated Person person = 1;
}

然后我使用以下命令编译它:

protoc -I=../examples --java_out=src/main/java ../examples/addressbook.proto

它运行时没有错误并生成addressbook.java。但据我所知，我需要一个 *.class 以便我可以在 eclipse 环境中使用它。我尝试使用以下命令将其输出到 *.jar 文件:

protoc -I=../examples --java_out=src/main/java/addressbook.jar ../examples/addressbook.proto

但是将该 jar 导入项目后，eclipse 说我需要类。当我在示例目录中时，我还尝试使用命令将其编译为类。

javac *java

它看到该文件，但返回大量行，后跟“100 个错误”。我知道我可能完全迷失了，甚至还没有接近正确的想法......但任何帮助都会很棒!谢谢!

哦，这是调用这个原型(prototype)的代码...

import com.example.tutorial.AddressBookProtos.AddressBook;
import com.example.tutorial.AddressBookProtos.Person;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintStream;

class ListPeople {
  // Iterates though all people in the AddressBook and prints info about them.
  static void Print(AddressBook addressBook) {
    for (Person person: addressBook.getPersonList()) {
      System.out.println("Person ID: " + person.getId());
      System.out.println("  Name: " + person.getName());
      if (person.hasEmail()) {
        System.out.println("  E-mail address: " + person.getEmail());
      }

      for (Person.PhoneNumber phoneNumber : person.getPhoneList()) {
        switch (phoneNumber.getType()) {
          case MOBILE:
            System.out.print("  Mobile phone #: ");
            break;
          case HOME:
            System.out.print("  Home phone #: ");
            break;
          case WORK:
            System.out.print("  Work phone #: ");
            break;
        }
        System.out.println(phoneNumber.getNumber());
      }
    }
  }

  // Main function:  Reads the entire address book from a file and prints all
  //   the information inside.
  public static void main(String[] args) throws Exception {
    if (args.length != 1) {
      System.err.println("Usage:  ListPeople ADDRESS_BOOK_FILE");
      System.exit(-1);
    }

    // Read the existing address book.
    AddressBook addressBook =
      AddressBook.parseFrom(new FileInputStream(args[0]));

    Print(addressBook);
  }
}

谢谢!

Link to protobuf tutorial I am using!

Answer 1

只需将 .java 文件包含在 Eclipse 的 src 目录中即可。 Eclipse 会将其编译成 .class 文件。