Proto :未找到导入Proto或有错误

Question

请帮帮我，我真的被困住了。我是为协议缓冲器工作的maven插件。我分别添加了两个文件: hello.proto和hello2.proto。在构建项目时，我会收到诸如hello2.proto: Import "h/hello.proto“没有找到或有错误的错误。

hello.proto

syntax = "proto3";

//option java_multiple_files = true;
option java_package = "com.poc_cipertrace.hello";
option java_outer_classname = "HelloWorldRequest";

message HelloRequest {
  string name = 1;
}

hello.proto

syntax = "proto3";

option java_package = "com.poc.poc_cipertrace.hello";
option java_outer_classname = "HelloWorldResponse";

import "h/hello.proto";

message HelloResponse {
  HelloRequest h=1;

}

POM.XML

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.poc</groupId>
    <artifactId>poc_cipertrace</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <name>poc_cipertrace</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>11</java.version>
        <lombok.version>1.18.22</lombok.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.6.1</version>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-netty-shaded</artifactId>
            <version>1.15.1</version>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-protobuf</artifactId>
            <version>1.15.1</version>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-stub</artifactId>
            <version>1.15.1</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>com.github.os72</groupId>
                <artifactId>protoc-jar-maven-plugin</artifactId>
                <version>3.6.0.1</version>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>run</goal>
                        </goals>
                        <configuration>
                            <includeMavenTypes>direct</includeMavenTypes>
                            <inputDirectories>
                                <include>src/main/resources/proto</include>
                            </inputDirectories>
                            <outputTargets>
                                <outputTarget>
                                    <type>java</type>
                                    <outputDirectory>src/main/java</outputDirectory>
                                </outputTarget>
                                <outputTarget>
                                    <type>grpc-java</type>
                                    <pluginArtifact>io.grpc:protoc-gen-grpc-java:1.15.0</pluginArtifact>
                                    <outputDirectory>src/main/java</outputDirectory>
                                </outputTarget>
                            </outputTargets>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

项目结构

​

​

预期的输出是Java应该根据包生成。我尝试过通过各种网站，但我无法获得预期的输出。

用protobuf-maven-plugin检索原版的外部.proto文件

.proto文件中导入错误

Answer 1

我不使用Java，因此无法帮助您的POM.xml，但是，您的proto定义是不正确的，而且看起来是不必要的复杂。

TL;DR:假设您希望h和h2定义包，则必须在proto文件中引用它们，方法是添加与原始文件夹名路径匹配的package引用。在您的示例中，假设${PWD}/proto是proto路径，例如h/hello.proto表示包h

h/hello.proto

syntax = "proto3";

package h;

//option java_multiple_files = true;
option java_package = "com.poc.poc_cipertrace.hello";
option java_outer_classname = "HelloWorldRequest";

message HelloRequest {
  string name = 1;
}

h2/hello.proto

syntax = "proto3";

package h2;

option java_package = "com.poc.poc_cipertrace.hello";
option java_outer_classname = "HelloWorldResponse";

import "h/hello.proto";

message HelloResponse {
  h.HelloRequest h=1;
}

然后(不使用mvn，直接使用protoc )：

protoc \
--proto_path=${PWD}/proto \
--java_out=${PWD} \
${PWD}/proto/h/hello.proto \
${PWD}/proto/h2/hello.proto

产量：

com
└── poc
    └── poc_cipertrace
        └── hello
            ├── HelloWorldRequest.java
            └── HelloWorldResponse.java

思想：

• 您有不同的java_package值，但我假设您希望它们位于相同的com.pod.pod_cipertrace.hello名称空间中。
• 你会让自己失去必要的(!?)将HelloRequest和HelloResponse分割成不同的package，并使用相同的文件名(hello.proto)，这将(应该！)合并成单个package中的单个proto。