protobuf生成java 类报错 proto生成c代码

// 构建时取得当前日期和时间
buildDate = DateTimeFormatter.ISO_LOCAL_DATE.format(buildTimeAndDate)
buildTime = DateTimeFormatter.ofPattern(‘HH:mm:ss.SSSZ’).format(buildTimeAndDate)
buildRevision = versioning.info.commit
}
allprojects {
apply plugin: ‘java’
apply plugin: ‘idea’
apply plugin: ‘eclipse’
apply plugin: ‘io.spring.dependency-management’
apply plugin: ‘io.franzbecker.gradle-lombok’
compileJava {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
options.encoding = ‘UTF-8’
}
compileJava.options*.compilerArgs = [
‘-Xlint:all’, ‘-Xlint:-processing’
]
// Copy LICENSE
tasks.withType(Jar) {
from(project.rootDir) {
include ‘LICENSE’
into ‘META-INF’
}
}
// 写入到MANIFEST.MF中的内容
jar {
manifest {
attributes(
‘Created-By’: “{System.properties[‘java.vendor’]} ${System.properties[‘java.vm.version’]})”.toString(),‘Built-By’: ‘travis’,
‘Build-Date’: buildDate,
‘Build-Time’: buildTime,
‘Built-OS’: “${System.properties[‘os.name’]}”,
‘Build-Revision’: buildRevision,
‘Specification-Title’: project.name,
‘Specification-Version’: projectVersion,
‘Specification-Vendor’: ‘Will Zhao’,
‘Implementation-Title’: project.name,
‘Implementation-Version’: projectVersion,
‘Implementation-Vendor’: ‘Will Zhao’
)
}
}
repositories {
mavenCentral()
// 如果有私服就在此配置，如果没有请注释掉
maven {
url ‘http://192.168.50.43:8081/repository/aliyun-proxy/’
}
// 阿里云
maven {
url ‘http://maven.aliyun.com/nexus/content/groups/public/’
}
jcenter()
}
buildscript {
repositories {
maven { url ‘https://plugins.gradle.org/m2/’ }
}
}
}
allprojects { project ->
buildscript {
dependencyManagement {
imports {
mavenBom “org.springframework.boot:spring-boot-starter-parent:${springBootVersion}”
mavenBom “org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}”
mavenBom “com.google.protobuf:protobuf-bom:${protobufVersion}”
mavenBom “io.grpc:grpc-bom:${grpcVersion}”
mavenBom “org.junit:junit-bom:5.7.0”
}
dependencies {
dependency ‘org.projectlombok:lombok:1.16.16’
dependency ‘org.apache.commons:commons-lang3:3.11’
dependency ‘commons-collections:commons-collections:3.2.2’
dependency “net.devh:grpc-server-spring-boot-starter:${grpcSpringBootStarterVersion}”
dependency “net.devh:grpc-client-spring-boot-starter:${grpcSpringBootStarterVersion}”
}
}
ext {
micrometerVersion = dependencyManagement.importedProperties[‘micrometer.version’]
springFrameworkVersion = dependencyManagement.importedProperties[‘spring-framework.version’]
springSecurityVersion = dependencyManagement.importedProperties[‘spring-security.version’]
springCloudCommonsVersion = dependencyManagement.importedProperties[‘spring-cloud-commons.version’]
}
}
}
group = ‘com.bolingcavalry’
version = projectVersion

• 整个系列用到的父工程已经完成，接下来可以开始编码了；

实战用proto文件自动生成java代码

• gRPC服务能够用不同的语言编写，其中的关键是定义服务的proto文件可以被生成各种语言的代码，java也不例外，接下来一起体验；
• 在父工程grpc-tutorials下新建模块，名为grpc-lib，其build.gradle内容如下，可见主要是配置了protobuf插件，以及生成的java代码如何才能被IDE工具加入到source path中：

// 根据proto生成java代码的gradle插件
plugins {
id ‘com.google.protobuf’
}
dependencies {
implementation ‘io.grpc:grpc-netty-shaded’
implementation ‘io.grpc:grpc-protobuf’
implementation ‘io.grpc:grpc-stub’
if (JavaVersion.current().isJava9Compatible()) {
// Workaround for @javax.annotation.Generated
// see: https://github.com/grpc/grpc-java/issues/3633
implementation ‘jakarta.annotation:jakarta.annotation-api’
}
}
protobuf {
protoc {
artifact = “com.google.protobuf:protoc:${protobufVersion}”
}
// 自动生成的代码放在这里
generatedFilesBaseDir = “$projectDir/src/generated”
clean {
delete generatedFilesBaseDir
}
// 生成java代码的插件
plugins {
grpc {
artifact = ‘io.grpc:protoc-gen-grpc-java’
}
}
generateProtoTasks {
all()*.plugins {
grpc {}
}
}
}
// 对于eclipse，通过以下脚本可以将生成的代码加入source路径中，编译时会被用到
eclipse {
classpath {
file.beforeMerged { cp ->
def generatedGrpcFolder = new org.gradle.plugins.ide.eclipse.model.SourceFolder(‘src/generated/main/grpc’, null);
generatedGrpcFolder.entryAttributes[‘ignore_optional_problems’] = ‘true’;
cp.entries.add( generatedGrpcFolder );
def generatedJavaFolder = new org.gradle.plugins.ide.eclipse.model.SourceFolder(‘src/generated/main/java’, null);
generatedJavaFolder.entryAttributes[‘ignore_optional_problems’] = ‘true’;
cp.entries.add( generatedJavaFolder );
}
}
}
// 对于idea，通过以下脚本可以将生成的代码加入source路径中，编译时会被用到
idea {
module {
sourceDirs += file(‘src/generated/main/java’)
sourceDirs += file(‘src/generated/main/grpc’)
generatedSourceDirs += file(‘src/generated/main/java’)
generatedSourceDirs += file(‘src/generated/main/grpc’)
}
}
• 在grpc-lib模块的src/main/proto目录下新增名为helloworld.proto的文件，这里面定义了一个gRPC服务，里面含有一个接口，并且还有这个接口的入参和返回结果的定义：
syntax = “proto3”;