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AWS SDK for Java 2.x - AWS Lambda

AWS SDK for Java 2.x - AWS Lambda

When to Use

适用场景

Use this skill when:
  • Invoking Lambda functions programmatically
  • Creating or updating Lambda functions
  • Managing Lambda function configurations
  • Working with Lambda environment variables
  • Managing Lambda layers and aliases
  • Implementing asynchronous Lambda invocations
  • Integrating Lambda with Spring Boot
本指南适用于以下场景：
  • 以编程方式调用Lambda函数
  • 创建或更新Lambda函数
  • 管理Lambda函数配置
  • 处理Lambda环境变量
  • 管理Lambda层和别名
  • 实现Lambda异步调用
  • 将Lambda与Spring Boot集成

Overview

概述

AWS Lambda is a compute service that runs code without the need to manage servers. Your code runs automatically, scaling up and down with pay-per-use pricing. Use this skill to implement AWS Lambda operations using AWS SDK for Java 2.x in applications and services.
AWS Lambda是一种无需管理服务器的计算服务。代码会自动运行，根据使用量弹性扩缩，并采用按使用量付费的定价模式。本指南介绍如何在应用和服务中使用AWS SDK for Java 2.x实现AWS Lambda操作。

Dependencies

依赖配置

xml
<dependency>
    <groupId>software.amazon.awssdk</groupId>
    <artifactId>lambda</artifactId>
</dependency>
xml
<dependency>
    <groupId>software.amazon.awssdk</groupId>
    <artifactId>lambda</artifactId>
</dependency>

Client Setup

客户端配置

To use AWS Lambda, create a LambdaClient with the required region configuration:
java
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.lambda.LambdaClient;

LambdaClient lambdaClient = LambdaClient.builder()
    .region(Region.US_EAST_1)
    .build();
For asynchronous operations, use LambdaAsyncClient:
java
import software.amazon.awssdk.services.lambda.LambdaAsyncClient;

LambdaAsyncClient asyncLambdaClient = LambdaAsyncClient.builder()
    .region(Region.US_EAST_1)
    .build();
要使用AWS Lambda，需创建带有指定区域配置的LambdaClient：
java
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.lambda.LambdaClient;

LambdaClient lambdaClient = LambdaClient.builder()
    .region(Region.US_EAST_1)
    .build();
对于异步操作，请使用LambdaAsyncClient：
java
import software.amazon.awssdk.services.lambda.LambdaAsyncClient;

LambdaAsyncClient asyncLambdaClient = LambdaAsyncClient.builder()
    .region(Region.US_EAST_1)
    .build();

Invoke Lambda Function

调用Lambda函数

Synchronous Invocation

同步调用

Invoke Lambda functions synchronously to get immediate results:
java
import software.amazon.awssdk.services.lambda.model.*;
import software.amazon.awssdk.core.SdkBytes;

public String invokeLambda(LambdaClient lambdaClient,
                           String functionName,
                           String payload) {
    InvokeRequest request = InvokeRequest.builder()
        .functionName(functionName)
        .payload(SdkBytes.fromUtf8String(payload))
        .build();

    InvokeResponse response = lambdaClient.invoke(request);

    return response.payload().asUtf8String();
}
同步调用Lambda函数以获取即时结果：
java
import software.amazon.awssdk.services.lambda.model.*;
import software.amazon.awssdk.core.SdkBytes;

public String invokeLambda(LambdaClient lambdaClient,
                           String functionName,
                           String payload) {
    InvokeRequest request = InvokeRequest.builder()
        .functionName(functionName)
        .payload(SdkBytes.fromUtf8String(payload))
        .build();

    InvokeResponse response = lambdaClient.invoke(request);

    return response.payload().asUtf8String();
}

Asynchronous Invocation

异步调用

Use asynchronous invocation for fire-and-forget scenarios:
java
public void invokeLambdaAsync(LambdaClient lambdaClient,
                              String functionName,
                              String payload) {
    InvokeRequest request = InvokeRequest.builder()
        .functionName(functionName)
        .invocationType(InvocationType.EVENT) // Asynchronous
        .payload(SdkBytes.fromUtf8String(payload))
        .build();

    InvokeResponse response = lambdaClient.invoke(request);

    System.out.println("Status: " + response.statusCode());
}
在“即发即弃”场景下使用异步调用：
java
public void invokeLambdaAsync(LambdaClient lambdaClient,
                              String functionName,
                              String payload) {
    InvokeRequest request = InvokeRequest.builder()
        .functionName(functionName)
        .invocationType(InvocationType.EVENT) // Asynchronous
        .payload(SdkBytes.fromUtf8String(payload))
        .build();

    InvokeResponse response = lambdaClient.invoke(request);

    System.out.println("Status: " + response.statusCode());
}

Invoke with JSON Objects

结合JSON对象调用

Work with JSON payloads for complex data structures:
java
import com.fasterxml.jackson.databind.ObjectMapper;

public <T> String invokeLambdaWithObject(LambdaClient lambdaClient,
                                         String functionName,
                                         T requestObject) throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    String jsonPayload = mapper.writeValueAsString(requestObject);

    InvokeRequest request = InvokeRequest.builder()
        .functionName(functionName)
        .payload(SdkBytes.fromUtf8String(jsonPayload))
        .build();

    InvokeResponse response = lambdaClient.invoke(request);

    return response.payload().asUtf8String();
}
使用JSON负载处理复杂数据结构：
java
import com.fasterxml.jackson.databind.ObjectMapper;

public <T> String invokeLambdaWithObject(LambdaClient lambdaClient,
                                         String functionName,
                                         T requestObject) throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    String jsonPayload = mapper.writeValueAsString(requestObject);

    InvokeRequest request = InvokeRequest.builder()
        .functionName(functionName)
        .payload(SdkBytes.fromUtf8String(jsonPayload))
        .build();

    InvokeResponse response = lambdaClient.invoke(request);

    return response.payload().asUtf8String();
}

Parse Typed Responses

解析类型化响应

Parse JSON responses into typed objects:
java
public <T> T invokeLambdaAndParse(LambdaClient lambdaClient,
                                  String functionName,
                                  Object request,
                                  Class<T> responseType) throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    String jsonPayload = mapper.writeValueAsString(request);

    InvokeRequest invokeRequest = InvokeRequest.builder()
        .functionName(functionName)
        .payload(SdkBytes.fromUtf8String(jsonPayload))
        .build();

    InvokeResponse response = lambdaClient.invoke(invokeRequest);

    String responseJson = response.payload().asUtf8String();

    return mapper.readValue(responseJson, responseType);
}
将JSON响应解析为类型化对象：
java
public <T> T invokeLambdaAndParse(LambdaClient lambdaClient,
                                  String functionName,
                                  Object request,
                                  Class<T> responseType) throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    String jsonPayload = mapper.writeValueAsString(request);

    InvokeRequest invokeRequest = InvokeRequest.builder()
        .functionName(functionName)
        .payload(SdkBytes.fromUtf8String(jsonPayload))
        .build();

    InvokeResponse response = lambdaClient.invoke(invokeRequest);

    String responseJson = response.payload().asUtf8String();

    return mapper.readValue(responseJson, responseType);
}

Function Management

函数管理

List Functions

列出函数

List all Lambda functions for the current account:
java
public List<FunctionConfiguration> listFunctions(LambdaClient lambdaClient) {
    ListFunctionsResponse response = lambdaClient.listFunctions();

    return response.functions();
}
列出当前账号下的所有Lambda函数：
java
public List<FunctionConfiguration> listFunctions(LambdaClient lambdaClient) {
    ListFunctionsResponse response = lambdaClient.listFunctions();

    return response.functions();
}

Get Function Configuration

获取函数配置

Retrieve function configuration and metadata:
java
public FunctionConfiguration getFunctionConfig(LambdaClient lambdaClient,
                                                String functionName) {
    GetFunctionRequest request = GetFunctionRequest.builder()
        .functionName(functionName)
        .build();

    GetFunctionResponse response = lambdaClient.getFunction(request);

    return response.configuration();
}
获取函数配置和元数据：
java
public FunctionConfiguration getFunctionConfig(LambdaClient lambdaClient,
                                                String functionName) {
    GetFunctionRequest request = GetFunctionRequest.builder()
        .functionName(functionName)
        .build();

    GetFunctionResponse response = lambdaClient.getFunction(request);

    return response.configuration();
}

Update Function Code

更新函数代码

Update Lambda function code with new deployment package:
java
import java.nio.file.Files;
import java.nio.file.Paths;

public void updateFunctionCode(LambdaClient lambdaClient,
                               String functionName,
                               String zipFilePath) throws IOException {
    byte[] zipBytes = Files.readAllBytes(Paths.get(zipFilePath));

    UpdateFunctionCodeRequest request = UpdateFunctionCodeRequest.builder()
        .functionName(functionName)
        .zipFile(SdkBytes.fromByteArray(zipBytes))
        .publish(true)
        .build();

    UpdateFunctionCodeResponse response = lambdaClient.updateFunctionCode(request);

    System.out.println("Updated function version: " + response.version());
}
使用新的部署包更新Lambda函数代码：
java
import java.nio.file.Files;
import java.nio.file.Paths;

public void updateFunctionCode(LambdaClient lambdaClient,
                               String functionName,
                               String zipFilePath) throws IOException {
    byte[] zipBytes = Files.readAllBytes(Paths.get(zipFilePath));

    UpdateFunctionCodeRequest request = UpdateFunctionCodeRequest.builder()
        .functionName(functionName)
        .zipFile(SdkBytes.fromByteArray(zipBytes))
        .publish(true)
        .build();

    UpdateFunctionCodeResponse response = lambdaClient.updateFunctionCode(request);

    System.out.println("Updated function version: " + response.version());
}

Update Function Configuration

更新函数配置

Modify function settings like timeout, memory, and environment variables:
java
public void updateFunctionConfiguration(LambdaClient lambdaClient,
                                        String functionName,
                                        Map<String, String> environment) {
    Environment env = Environment.builder()
        .variables(environment)
        .build();

    UpdateFunctionConfigurationRequest request = UpdateFunctionConfigurationRequest.builder()
        .functionName(functionName)
        .environment(env)
        .timeout(60)
        .memorySize(512)
        .build();

    lambdaClient.updateFunctionConfiguration(request);
}
修改函数设置，如超时时间、内存和环境变量：
java
public void updateFunctionConfiguration(LambdaClient lambdaClient,
                                        String functionName,
                                        Map<String, String> environment) {
    Environment env = Environment.builder()
        .variables(environment)
        .build();

    UpdateFunctionConfigurationRequest request = UpdateFunctionConfigurationRequest.builder()
        .functionName(functionName)
        .environment(env)
        .timeout(60)
        .memorySize(512)
        .build();

    lambdaClient.updateFunctionConfiguration(request);
}

Create Function

创建函数

Create new Lambda functions with code and configuration:
java
public void createFunction(LambdaClient lambdaClient,
                          String functionName,
                          String roleArn,
                          String handler,
                          String zipFilePath) throws IOException {
    byte[] zipBytes = Files.readAllBytes(Paths.get(zipFilePath));

    FunctionCode code = FunctionCode.builder()
        .zipFile(SdkBytes.fromByteArray(zipBytes))
        .build();

    CreateFunctionRequest request = CreateFunctionRequest.builder()
        .functionName(functionName)
        .runtime(Runtime.JAVA17)
        .role(roleArn)
        .handler(handler)
        .code(code)
        .timeout(60)
        .memorySize(512)
        .build();

    CreateFunctionResponse response = lambdaClient.createFunction(request);

    System.out.println("Function ARN: " + response.functionArn());
}
使用代码和配置创建新的Lambda函数：
java
public void createFunction(LambdaClient lambdaClient,
                          String functionName,
                          String roleArn,
                          String handler,
                          String zipFilePath) throws IOException {
    byte[] zipBytes = Files.readAllBytes(Paths.get(zipFilePath));

    FunctionCode code = FunctionCode.builder()
        .zipFile(SdkBytes.fromByteArray(zipBytes))
        .build();

    CreateFunctionRequest request = CreateFunctionRequest.builder()
        .functionName(functionName)
        .runtime(Runtime.JAVA17)
        .role(roleArn)
        .handler(handler)
        .code(code)
        .timeout(60)
        .memorySize(512)
        .build();

    CreateFunctionResponse response = lambdaClient.createFunction(request);

    System.out.println("Function ARN: " + response.functionArn());
}

Delete Function

删除函数

Remove Lambda functions when no longer needed:
java
public void deleteFunction(LambdaClient lambdaClient, String functionName) {
    DeleteFunctionRequest request = DeleteFunctionRequest.builder()
        .functionName(functionName)
        .build();

    lambdaClient.deleteFunction(request);
}
删除不再需要的Lambda函数：
java
public void deleteFunction(LambdaClient lambdaClient, String functionName) {
    DeleteFunctionRequest request = DeleteFunctionRequest.builder()
        .functionName(functionName)
        .build();

    lambdaClient.deleteFunction(request);
}

Spring Boot Integration

Spring Boot集成

Configuration

配置

Configure Lambda clients as Spring beans:
java
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class LambdaConfiguration {

    @Bean
    public LambdaClient lambdaClient() {
        return LambdaClient.builder()
            .region(Region.US_EAST_1)
            .build();
    }
}
将Lambda客户端配置为Spring Bean：
java
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class LambdaConfiguration {

    @Bean
    public LambdaClient lambdaClient() {
        return LambdaClient.builder()
            .region(Region.US_EAST_1)
            .build();
    }
}

Lambda Invoker Service

Lambda调用服务

Create a service for Lambda function invocation:
java
import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Autowired;

@Service
public class LambdaInvokerService {

    private final LambdaClient lambdaClient;
    private final ObjectMapper objectMapper;

    @Autowired
    public LambdaInvokerService(LambdaClient lambdaClient, ObjectMapper objectMapper) {
        this.lambdaClient = lambdaClient;
        this.objectMapper = objectMapper;
    }

    public <T, R> R invoke(String functionName, T request, Class<R> responseType) {
        try {
            String jsonPayload = objectMapper.writeValueAsString(request);

            InvokeRequest invokeRequest = InvokeRequest.builder()
                .functionName(functionName)
                .payload(SdkBytes.fromUtf8String(jsonPayload))
                .build();

            InvokeResponse response = lambdaClient.invoke(invokeRequest);

            if (response.functionError() != null) {
                throw new LambdaInvocationException(
                    "Lambda function error: " + response.functionError());
            }

            String responseJson = response.payload().asUtf8String();

            return objectMapper.readValue(responseJson, responseType);

        } catch (Exception e) {
            throw new RuntimeException("Failed to invoke Lambda function", e);
        }
    }

    public void invokeAsync(String functionName, Object request) {
        try {
            String jsonPayload = objectMapper.writeValueAsString(request);

            InvokeRequest invokeRequest = InvokeRequest.builder()
                .functionName(functionName)
                .invocationType(InvocationType.EVENT)
                .payload(SdkBytes.fromUtf8String(jsonPayload))
                .build();

            lambdaClient.invoke(invokeRequest);

        } catch (Exception e) {
            throw new RuntimeException("Failed to invoke Lambda function async", e);
        }
    }
}
创建用于调用Lambda函数的服务：
java
import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Autowired;

@Service
public class LambdaInvokerService {

    private final LambdaClient lambdaClient;
    private final ObjectMapper objectMapper;

    @Autowired
    public LambdaInvokerService(LambdaClient lambdaClient, ObjectMapper objectMapper) {
        this.lambdaClient = lambdaClient;
        this.objectMapper = objectMapper;
    }

    public <T, R> R invoke(String functionName, T request, Class<R> responseType) {
        try {
            String jsonPayload = objectMapper.writeValueAsString(request);

            InvokeRequest invokeRequest = InvokeRequest.builder()
                .functionName(functionName)
                .payload(SdkBytes.fromUtf8String(jsonPayload))
                .build();

            InvokeResponse response = lambdaClient.invoke(invokeRequest);

            if (response.functionError() != null) {
                throw new LambdaInvocationException(
                    "Lambda function error: " + response.functionError());
            }

            String responseJson = response.payload().asUtf8String();

            return objectMapper.readValue(responseJson, responseType);

        } catch (Exception e) {
            throw new RuntimeException("Failed to invoke Lambda function", e);
        }
    }

    public void invokeAsync(String functionName, Object request) {
        try {
            String jsonPayload = objectMapper.writeValueAsString(request);

            InvokeRequest invokeRequest = InvokeRequest.builder()
                .functionName(functionName)
                .invocationType(InvocationType.EVENT)
                .payload(SdkBytes.fromUtf8String(jsonPayload))
                .build();

            lambdaClient.invoke(invokeRequest);

        } catch (Exception e) {
            throw new RuntimeException("Failed to invoke Lambda function async", e);
        }
    }
}

Typed Lambda Client

类型化Lambda客户端

Create type-safe interfaces for Lambda services:
java
public interface OrderProcessor {
    OrderResponse processOrder(OrderRequest request);
}

@Service
public class LambdaOrderProcessor implements OrderProcessor {

    private final LambdaInvokerService lambdaInvoker;

    @Value("${lambda.order-processor.function-name}")
    private String functionName;

    public LambdaOrderProcessor(LambdaInvokerService lambdaInvoker) {
        this.lambdaInvoker = lambdaInvoker;
    }

    @Override
    public OrderResponse processOrder(OrderRequest request) {
        return lambdaInvoker.invoke(functionName, request, OrderResponse.class);
    }
}
为Lambda服务创建类型安全的接口：
java
public interface OrderProcessor {
    OrderResponse processOrder(OrderRequest request);
}

@Service
public class LambdaOrderProcessor implements OrderProcessor {

    private final LambdaInvokerService lambdaInvoker;

    @Value("${lambda.order-processor.function-name}")
    private String functionName;

    public LambdaOrderProcessor(LambdaInvokerService lambdaInvoker) {
        this.lambdaInvoker = lambdaInvoker;
    }

    @Override
    public OrderResponse processOrder(OrderRequest request) {
        return lambdaInvoker.invoke(functionName, request, OrderResponse.class);
    }
}

Error Handling

错误处理

Implement comprehensive error handling for Lambda operations:
java
public String invokeLambdaSafe(LambdaClient lambdaClient,
                               String functionName,
                               String payload) {
    try {
        InvokeRequest request = InvokeRequest.builder()
            .functionName(functionName)
            .payload(SdkBytes.fromUtf8String(payload))
            .build();

        InvokeResponse response = lambdaClient.invoke(request);

        // Check for function error
        if (response.functionError() != null) {
            String errorMessage = response.payload().asUtf8String();
            throw new RuntimeException("Lambda error: " + errorMessage);
        }

        // Check status code
        if (response.statusCode() != 200) {
            throw new RuntimeException("Lambda invocation failed with status: " +
                response.statusCode());
        }

        return response.payload().asUtf8String();

    } catch (LambdaException e) {
        System.err.println("Lambda error: " + e.awsErrorDetails().errorMessage());
        throw e;
    }
}

public class LambdaInvocationException extends RuntimeException {
    public LambdaInvocationException(String message) {
        super(message);
    }

    public LambdaInvocationException(String message, Throwable cause) {
        super(message, cause);
    }
}
为Lambda操作实现全面的错误处理：
java
public String invokeLambdaSafe(LambdaClient lambdaClient,
                               String functionName,
                               String payload) {
    try {
        InvokeRequest request = InvokeRequest.builder()
            .functionName(functionName)
            .payload(SdkBytes.fromUtf8String(payload))
            .build();

        InvokeResponse response = lambdaClient.invoke(request);

        // Check for function error
        if (response.functionError() != null) {
            String errorMessage = response.payload().asUtf8String();
            throw new RuntimeException("Lambda error: " + errorMessage);
        }

        // Check status code
        if (response.statusCode() != 200) {
            throw new RuntimeException("Lambda invocation failed with status: " +
                response.statusCode());
        }

        return response.payload().asUtf8String();

    } catch (LambdaException e) {
        System.err.println("Lambda error: " + e.awsErrorDetails().errorMessage());
        throw e;
    }
}

public class LambdaInvocationException extends RuntimeException {
    public LambdaInvocationException(String message) {
        super(message);
    }

    public LambdaInvocationException(String message, Throwable cause) {
        super(message, cause);
    }
}

Examples

示例

For comprehensive code examples, see the references section:
  • Basic examples - Simple invocation patterns and function management
  • Spring Boot integration - Complete Spring Boot configuration and service patterns
  • Testing examples - Unit and integration test patterns
  • Advanced patterns - Complex scenarios and best practices
完整的代码示例请参考参考资料部分：
  • 基础示例 - 简单调用模式和函数管理
  • Spring Boot集成 - 完整的Spring Boot配置和服务模式
  • 测试示例 - 单元测试和集成测试模式
  • 高级模式 - 复杂场景和最佳实践

Best Practices

最佳实践

  1. Reuse Lambda clients: Create once and reuse across invocations
  2. Set appropriate timeouts: Match client timeout to Lambda function timeout
  3. Use async invocation: For fire-and-forget scenarios
  4. Handle errors properly: Check for function errors and status codes
  5. Use environment variables: For function configuration
  6. Implement retry logic: For transient failures
  7. Monitor invocations: Use CloudWatch metrics
  8. Version functions: Use aliases and versions for production
  9. Use VPC: For accessing resources in private subnets
  10. Optimize payload size: Keep payloads small for better performance
  1. 复用Lambda客户端：创建一次并在多次调用中复用
  2. 设置合适的超时时间：客户端超时时间与Lambda函数超时时间匹配
  3. 使用异步调用：适用于“即发即弃”场景
  4. 正确处理错误：检查函数错误和状态码
  5. 使用环境变量：用于函数配置
  6. 实现重试逻辑：处理临时故障
  7. 监控调用情况：使用CloudWatch指标
  8. 版本化函数：在生产环境中使用别名和版本
  9. 使用VPC：访问私有子网中的资源
  10. 优化负载大小：保持负载较小以提升性能

Testing

测试

Test Lambda services using mocks and test assertions:
java
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
class LambdaInvokerServiceTest {

    @Mock
    private LambdaClient lambdaClient;

    @Mock
    private ObjectMapper objectMapper;

    @InjectMocks
    private LambdaInvokerService service;

    @Test
    void shouldInvokeLambdaSuccessfully() throws Exception {
        // Test implementation
    }
}
使用Mock和测试断言测试Lambda服务：
java
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

@ExtendWith(MockitoExtension.class)
class LambdaInvokerServiceTest {

    @Mock
    private LambdaClient lambdaClient;

    @Mock
    private ObjectMapper objectMapper;

    @InjectMocks
    private LambdaInvokerService service;

    @Test
    void shouldInvokeLambdaSuccessfully() throws Exception {
        // Test implementation
    }
}

Related Skills

相关技能

  • @aws-sdk-java-v2-core - Core AWS SDK patterns and client configuration
  • @spring-boot-dependency-injection - Spring dependency injection best practices
  • @unit-test-service-layer - Service testing patterns with Mockito
  • @spring-boot-actuator - Production monitoring and health checks
  • @aws-sdk-java-v2-core - AWS SDK核心模式和客户端配置
  • @spring-boot-dependency-injection - Spring依赖注入最佳实践
  • @unit-test-service-layer - 使用Mockito进行服务层测试的模式
  • @spring-boot-actuator - 生产环境监控和健康检查

References

参考资料

For detailed information and examples, see the following reference files:
  • Official Documentation - AWS Lambda concepts, API reference, and official guidance
  • Examples - Complete code examples and integration patterns
如需详细信息和示例，请查看以下参考文档：
  • 官方文档 - AWS Lambda概念、API参考和官方指南
  • 示例 - 完整的代码示例和集成模式

Additional Resources

额外资源