src/main/proto/Person.proto

syntax="proto3"; 
option java_package = "dyyx";   
option java_outer_classname = "PersonProto";   
message Person  { 
  string name = 1;
  int32 age = 2;
} 




        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.11.4</version>
        </dependency>

    <build>

        <extensions>
            <extension>
                <groupId>kr.motd.maven</groupId>
                <artifactId>os-maven-plugin</artifactId>
                <version>1.4.1.Final</version>
            </extension>
        </extensions>
        <plugins>
            <plugin>
                <groupId>org.xolstice.maven.plugins</groupId>
                <artifactId>protobuf-maven-plugin</artifactId>
                <version>0.5.1</version>
                <configuration>
                    <protocArtifact>
                        com.google.protobuf:protoc:3.1.0:exe:${os.detected.classifier}
                    </protocArtifact>
                    <pluginId>grpc-java</pluginId>
                </configuration>
                <!--
                    <executions>
                                  <execution>
                                      <goals>
                                           <goal>compile</goal>
                                           <goal>compile-custom</goal>
                                        </goals>
                                    </execution>
                               </executions>
                            -->
            </plugin>
        </plugins>
    </build>    



compile 阶段 进行  proto文件 编译


                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <!--<goal>compile-custom</goal>-->
                        </goals>
                    </execution>
                </executions>
  



os-maven-plugin  检测 系统属性 譬如 ${os.name}  ${os.arch}  





mvn protobuf:compile 
或者在 idea maven 窗口 选择 指定的插件任务执行


[INFO] --- protobuf-maven-plugin:0.5.1:compile (default-cli) @ maven-proto-demo ---
Downloading from alimaven: http://maven.aliyun.com/nexus/content/groups/public/com/google/protobuf/protoc/3.1.0/protoc-3.1.0.pom
Downloaded from alimaven: http://maven.aliyun.com/nexus/content/groups/public/com/google/protobuf/protoc/3.1.0/protoc-3.1.0.pom (4.5 kB at 4.3 kB/s)
Downloading from alimaven: http://maven.aliyun.com/nexus/content/groups/public/com/google/protobuf/protoc/3.1.0/protoc-3.1.0-osx-x86_64.exe
Downloaded from alimaven: http://maven.aliyun.com/nexus/content/groups/public/com/google/protobuf/protoc/3.1.0/protoc-3.1.0-osx-x86_64.exe (4.9 MB at 727 kB/s)
[INFO] Compiling 1 proto file(s) to /Users/dugang/dugang/my/hellocode/demo/maven-proto-demo/target/generated-sources/protobuf/java

注意会自动下载对应的 protoc 编译器  protoc-3.1.0-osx-x86_64.exe

生成 java 文件
target/generated-sources/protobuf/java/dyyx/PersonProto.java

target/generated-sources/protobuf/java  设置为源码目录 
目录右键 
Mark Directory As / Sources Root

建议把生成的java文件直接复制到 src 目录里


完整例子代码
https://gitee.com/dyyx/hellocode/tree/master/demo/maven-proto-demo


 idea设置源码目录 
 protobuf 简介 及 java实例