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gRPC 实战之——客户端为 Request，服务端为 Response

转载 作者：知者 更新时间：2024-03-12 23:31:52 25 4
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一 编写 proto 文件

syntax = "proto3";
package grpc.proto;
option java_package = "grpc.proto";
option java_outer_classname = "StudentData";
option java_multiple_files = true ;
// 定义接口
service StudentService {
    // 请求一个 Requset 对象，响应一个 Response 对象
    rpc queryStudentNameById(MyRequestId) returns(MyResponseName) {}
    // 请求一个 Requset 对象，响应一个 Stream 对象
    rpc queryStudentsByCourseName(MyRequestCourseName) returns(stream MyResponseStudentsStream) {}
    // 请求一个 Stream 对象，响应一个 Response 对象
    rpc queryStudentsByCourseName2(stream MyRequestCourseName) returns(MyResponseStudents) {}
    // 请求一个 Stream，响应一个 Stream 对象
    rpc queryStudentNameById2(stream MyRequestId) returns(stream MyResponseName) {}
}

message MyRequestId
{
    int32 id = 1 ;
}

message MyResponseName
{
    string name = 1 ;
}

message MyStudent
{
    int32 id = 1 ;
    string name = 2;
    string courseName = 3 ;
}

message MyResponseStudents
{
    // 服务端的响应结果是集合类型，因此需要加上 repeated
    repeated MyStudent students = 1 ;
}

// 数据结构,定义请求的 Request 对象
message MyRequestCourseName
{
    string courseName = 1 ;
}
// 数据结构,定义响应的 Stream
message MyResponseStudentsStream
{
    int32 id = 1 ;
    string name = 2;
    string courseName = 3 ;
}

二 编写接口实现类

package grpc;

import grpc.proto.*;
import io.grpc.stub.StreamObserver;

public class StudentServiceImpl extends StudentServiceGrpc.StudentServiceImplBase {
    @Override
    public void queryStudentNameById(MyRequestId request, StreamObserver<MyResponseName> responseObserver) {
        System.out.println("模拟查询此id的用户名：" + request.getId());
        // 假设此 id 的 name 是“zs”
        responseObserver.onNext(MyResponseName.newBuilder().setName("zs").build());
        responseObserver.onCompleted();
    }
]

三 编写服务端代码

package grpc;

import io.grpc.Server;
import io.grpc.ServerBuilder;

import java.io.IOException;

public class MyGRPCServer {
    private Server server;

    // 启动服务
    private void start() throws IOException {
        int port = 8888;
        server = ServerBuilder.forPort(port)
                .addService(new StudentServiceImpl())
                .build()
                .start();
        Runtime.getRuntime().addShutdownHook(new Thread(() ->{
                System.err.println(Thread.currentThread().getName() + "，关闭JVM");
                // 当 JVM 关闭前，先关闭 MyGRPCServer服务
                MyGRPCServer.this.stop();
            }
        ));
    }

    // 关闭服务
    private void stop() {
        if (server != null) {
            server.shutdown();
        }
    }

    private void blockUntilShutdown() throws InterruptedException {
        if (server != null) {
            // 等待服务结束
            server.awaitTermination();
        }
    }

    public static void main(String[] args) throws IOException, InterruptedException {
        final MyGRPCServer server = new MyGRPCServer();
        server.start();
        server.blockUntilShutdown();
    }
}

四 编写客户端代码

package grpc;

import grpc.proto.MyRequestId;
import grpc.proto.MyResponseName;
import grpc.proto.StudentServiceGrpc;
import io.grpc.ManagedChannel;
import io.grpc.ManagedChannelBuilder;

public class MyGRPCClient {
    public static void main(String[] args) throws Exception {
        // 创建一个客户端
        ManagedChannel client = ManagedChannelBuilder.forAddress("127.0.0.1", 8888)
                .usePlaintext().build();
        try {
            // 创建客户端的代理对象，用于代表客户端去访问服务端提供的方法
            StudentServiceGrpc.StudentServiceBlockingStub stub = StudentServiceGrpc
                    .newBlockingStub(client);
            // 请求Request，响应Response
            // 调用服务端提供的方法，查询id为1的姓名
            MyResponseName responseName = stub.queryStudentNameById(MyRequestId.newBuilder()
                    .setId(1).build());
            System.out.println(responseName.getName());
        } finally {
            client.shutdown();
        }
    }
}

五 测试

1 启动服务端和客户端

2 服务端打印如下

模拟查询此id的用户名：1

3 客户端打印如下

zs

六 冲突解决

GRPC-Server报错服务端启动com.google.common.base.Preconditions.checkArgument(ZLjava/lang/String；CLjava异常解决方案_时间是一种解药的博客-CSDN博客

https://blog.csdn.net/cucgyfjklx/article/details/122681339

guava 版本冲突，保留最高版本的 guava 可解决问题。

解决冲突后的 pom 文件如下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>demo2022</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <grpc.version>1.15.0</grpc.version><!-- CURRENT_GRPC_VERSION -->
        <protobuf.version>3.5.1</protobuf.version>
        <protoc.version>3.5.1-1</protoc.version>
        <netty.tcnative.version>2.0.7.Final</netty.tcnative.version>
    </properties>

    <dependencies>
        <!--Spring 官方提供的热部署插件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- easypoi-->
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-base</artifactId>
            <version>4.1.0</version>
            <exclusions>
                <exclusion>
                    <artifactId>guava</artifactId>
                    <groupId>com.google.guava</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-annotation</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.29.Final</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.3</version>
            <exclusions>
                <exclusion>
                    <artifactId>httpcore</artifactId>
                    <groupId>org.apache.httpcomponents</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.4</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.23</version>
        </dependency>
        <dependency>
            <groupId>org.apache.thrift</groupId>
            <artifactId>libthrift</artifactId>
            <version>0.11.0</version>
            <exclusions>
                <exclusion>
                    <artifactId>httpcore</artifactId>
                    <groupId>org.apache.httpcomponents</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>httpclient</artifactId>
                    <groupId>org.apache.httpcomponents</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-netty-shaded</artifactId>
            <version>${grpc.version}</version>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-protobuf</artifactId>
            <version>${grpc.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>guava</artifactId>
                    <groupId>com.google.guava</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-stub</artifactId>
            <version>${grpc.version}</version>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-alts</artifactId>
            <version>${grpc.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>httpclient</artifactId>
                    <groupId>org.apache.httpcomponents</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>grpc-grpclb</artifactId>
                    <groupId>io.grpc</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-testing</artifactId>
            <version>${grpc.version}</version>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <artifactId>mockito-core</artifactId>
                    <groupId>org.mockito</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- Used in HelloWorldServerTls -->
        <dependency>
            <groupId>io.grpc</groupId>
            <artifactId>grpc-netty</artifactId>
            <version>${grpc.version}</version>
        </dependency>
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-tcnative-boringssl-static</artifactId>
            <version>${netty.tcnative.version}</version>
        </dependency>

        <dependency>
            <groupId>com.google.api.grpc</groupId>
            <artifactId>proto-google-common-protos</artifactId>
            <version>1.0.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.protobuf</groupId>
            <artifactId>protobuf-java-util</artifactId>
            <version>${protobuf.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>guava</artifactId>
                    <groupId>com.google.guava</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <version>1.9.5</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <extensions>
            <extension>
                <groupId>kr.motd.maven</groupId>
                <artifactId>os-maven-plugin</artifactId>
                <version>1.5.0.Final</version>
            </extension>
        </extensions>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork><!--必须添加这个配置-->
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.xolstice.maven.plugins</groupId>
                <artifactId>protobuf-maven-plugin</artifactId>
                <version>0.5.1</version>
                <configuration>
                    <protocArtifact>com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier}
                    </protocArtifact>
                    <pluginId>grpc-java</pluginId>
                    <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}
                    </pluginArtifact>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>compile-custom</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

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