SpringBoot集成gRPC的步驟如下：

1. 添加依賴：在SpringBoot項目的pom.xml文件中添加gRPC的依賴，例如：

<dependency>
    <groupId>io.grpc</groupId>
    <artifactId>grpc-netty</artifactId>
    <version>1.41.0</version>
</dependency>

2. 定義.proto文件：根據需要定義gRPC接口的.proto文件，并使用protobuf編譯器生成對應的Java類，例如：

syntax = "proto3";

package com.example;

service Greeter {
    rpc SayHello (HelloRequest) returns (HelloReply) {}
}

message HelloRequest {
    string name = 1;
}

message HelloReply {
    string message = 1;
}

3. 實現Service：根據生成的Java類實現對應的Service接口，例如：

@GrpcService
public class GreeterService extends GreeterGrpc.GreeterImplBase {
    @Override
    public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
        String message = "Hello " + request.getName();
        HelloReply reply = HelloReply.newBuilder().setMessage(message).build();
        responseObserver.onNext(reply);
        responseObserver.onCompleted();
    }
}

4. 配置Server：配置gRPC Server并注冊實現的Service，例如：

@Configuration
public class GrpcConfig {
    @Bean
    public Server grpcServer(List<BindableService> services) {
        ServerBuilder<?> serverBuilder = ServerBuilder.forPort(9090);
        services.forEach(serverBuilder::addService);
        return serverBuilder.build();
    }
}

5. 啟動Server：在SpringBoot應用的啟動類中啟動gRPC Server，例如：

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

6. 編寫客戶端代碼：編寫gRPC客戶端代碼來調用服務端接口，例如：

public class GrpcClient {

    public static void main(String[] args) {
        ManagedChannel channel = ManagedChannelBuilder.forAddress("localhost", 9090)
                .usePlaintext()
                .build();

        GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(channel);
        HelloReply reply = stub.sayHello(HelloRequest.newBuilder().setName("World").build());

        System.out.println(reply.getMessage());

        channel.shutdown();
    }
}

通過以上步驟，就可以完成SpringBoot集成gRPC的開發工作。