> ## Documentation Index
> Fetch the complete documentation index at: https://docs.dodopayments.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Java

> 将 Dodo Payments 集成到您的 Java 应用程序中，使用强大且类型安全的 SDK

Java SDK 为用 Java 编写的应用程序提供了方便且符合人体工程学的 Dodo Payments REST API 访问。它利用了 Java 特有的功能，如 Optional、Stream 和 CompletableFuture，以支持现代 Java 开发。

## 安装

### Maven

将依赖添加到您的`pom.xml`：

```xml pom.xml theme={null}
<dependency>
  <groupId>com.dodopayments.api</groupId>
  <artifactId>dodo-payments-java</artifactId>
  <version>1.86.3</version>
</dependency>
```

### Gradle

将依赖添加到您的`build.gradle`：

```kotlin build.gradle.kts theme={null}
implementation("com.dodopayments.api:dodo-payments-java:1.86.3")
```

<Tip>
  始终使用最新的 SDK 版本以访问最新的 Dodo Payments 功能。请在[Maven Central](https://central.sonatype.com/artifact/com.dodopayments.api/dodo-payments-java)查看最新版本。
</Tip>

<Info>
  该 SDK 支持 Java 8 及所有更高版本，包括 Java 11、17 和 21。
</Info>

## 快速开始

初始化客户端并创建结账会话：

```java theme={null}
import com.dodopayments.api.client.DodoPaymentsClient;
import com.dodopayments.api.client.okhttp.DodoPaymentsOkHttpClient;
import com.dodopayments.api.models.checkoutsessions.CheckoutSessionCreateParams;
import com.dodopayments.api.models.checkoutsessions.CheckoutSessionRequest;
import com.dodopayments.api.models.checkoutsessions.ProductItemReq;

// Configure using environment variables (DODO_PAYMENTS_API_KEY, DODO_PAYMENTS_BASE_URL)
// Or system properties (dodopayments.apiKey, dodopayments.baseUrl)
DodoPaymentsClient client = DodoPaymentsOkHttpClient.fromEnv();

CheckoutSessionRequest params = CheckoutSessionRequest.builder()
    .addProductCart(ProductItemReq.builder()
        .productId("product_id")
        .quantity(1)
        .build())
    .build();
    
CheckoutSessionResponse checkoutSessionResponse = client.checkoutSessions().create(params);
System.out.println(checkoutSessionResponse.sessionId());
```

<Warning>
  请始终通过环境变量、系统属性或安全的配置管理系统安全地存储您的 API 密钥，切勿将其硬编码在源代码中。
</Warning>

## 核心功能

<CardGroup cols={2}>
  <Card title="Type Safety" icon="shield-check">
    强类型 API，提供编译时安全性
  </Card>

  <Card title="Thread-Safe" icon="bolt">
    支持多线程应用中的并发安全使用
  </Card>

  <Card title="Builder Pattern" icon="layer-group">
    构建请求的直观构建器模式
  </Card>

  <Card title="Async Support" icon="arrows-rotate">
    支持 CompletableFuture 的异步操作
  </Card>
</CardGroup>

## 配置

### 环境变量

使用环境变量或系统属性进行配置：

```bash .env theme={null}
DODO_PAYMENTS_API_KEY=your_api_key_here
DODO_PAYMENTS_BASE_URL=https://live.dodopayments.com
```

```java theme={null}
// Automatically reads from environment variables
DodoPaymentsClient client = DodoPaymentsOkHttpClient.fromEnv();
```

### 手动配置

手动配置所有选项：

```java theme={null}
import java.time.Duration;

DodoPaymentsClient client = DodoPaymentsOkHttpClient.builder()
    .bearerToken("your_api_key_here")
    .baseUrl("https://live.dodopayments.com")
    .maxRetries(4)
    .timeout(Duration.ofSeconds(30))
    .responseValidation(true)
    .build();
```

### 测试模式

为测试/沙盒环境配置：

```java theme={null}
DodoPaymentsClient testClient = DodoPaymentsOkHttpClient.builder()
    .fromEnv()
    .testMode()
    .build();
```

## 常见操作

### 创建结账会话

生成结账会话：

```java theme={null}
CheckoutSessionRequest params = CheckoutSessionRequest.builder()
    .addProductCart(ProductItemReq.builder()
        .productId("prod_123")
        .quantity(1)
        .build())
    .returnUrl("https://yourdomain.com/return")
    .build();

CheckoutSessionResponse session = client.checkoutSessions().create(params);
System.out.println("Checkout URL: " + session.checkoutUrl());
```

### 管理客户

创建和检索客户信息：

```java theme={null}
import com.dodopayments.api.models.customers.Customer;
import com.dodopayments.api.models.customers.CustomerCreateParams;

// Create a customer
CustomerCreateParams createParams = CustomerCreateParams.builder()
    .email("customer@example.com")
    .name("John Doe")
    .putMetadata("user_id", "12345")
    .build();

Customer customer = client.customers().create(createParams);

// Retrieve customer
Customer retrieved = client.customers().retrieve("cus_123");
System.out.println("Customer: " + retrieved.name() + " (" + retrieved.email() + ")");
```

### 处理订阅

创建和管理定期订阅：

```java theme={null}
import com.dodopayments.api.models.subscriptions.*;

// Create a subscription
SubscriptionNewParams subscriptionParams = SubscriptionNewParams.builder()
    .customerId("cus_123")
    .productId("prod_456")
    .priceId("price_789")
    .build();

Subscription subscription = client.subscriptions().create(subscriptionParams);

// Charge subscription
SubscriptionChargeParams chargeParams = SubscriptionChargeParams.builder()
    .amount(1000)
    .build();

SubscriptionChargeResponse chargeResponse = client.subscriptions()
    .charge(subscription.id(), chargeParams);
```

## 基于使用的计费

### 配置计量器

创建和管理用于跟踪使用情况的计量器：

```java theme={null}
import com.dodopayments.api.models.meters.*;

// Create API calls meter
MeterCreateParams apiMeterParams = MeterCreateParams.builder()
    .name("API Requests")
    .eventName("api_request")
    .aggregation("count")
    .putMetadata("category", "api_usage")
    .build();

Meter apiMeter = client.meters().create(apiMeterParams);
System.out.println("Meter created: " + apiMeter.meterId());

// List all meters
client.meters().list()
    .autoPager()
    .forEach(m -> System.out.println("Meter: " + m.name() + " - " + m.aggregation()));
```

### 记录使用事件

跟踪自定义事件：

```java theme={null}
import com.dodopayments.api.models.usageevents.*;
import java.time.OffsetDateTime;

// Ingest single event
UsageEventIngestParams singleEventParams = UsageEventIngestParams.builder()
    .addEvent(UsageEventIngestParams.Event.builder()
        .eventId("api_call_" + System.currentTimeMillis())
        .customerId("cus_abc123")
        .eventName("api_request")
        .timestamp(OffsetDateTime.now())
        .putMetadata("endpoint", "/api/v1/users")
        .putMetadata("method", "GET")
        .putMetadata("tokens_used", "150")
        .build())
    .build();

UsageEventIngestResponse response = client.usageEvents().ingest(singleEventParams);
System.out.println("Processed: " + response.processedEvents());
```

### 批量记录事件

```java theme={null}
import com.dodopayments.api.models.usageevents.*;
import java.time.OffsetDateTime;

// Ingest single event
UsageEventIngestParams singleEventParams = UsageEventIngestParams.builder()
    .addEvent(UsageEventIngestParams.Event.builder()
        .eventId("api_call_" + System.currentTimeMillis())
        .customerId("cus_abc123")
        .eventName("api_request")
        .timestamp(OffsetDateTime.now())
        .putMetadata("endpoint", "/api/v1/users")
        .putMetadata("method", "GET")
        .putMetadata("tokens_used", "150")
        .build())
    .build();

UsageEventIngestResponse response = client.usageEvents().ingest(singleEventParams);
System.out.println("Processed: " + response.ingestedCount());
```

```java theme={null}
UsageEventIngestParams.Builder batchBuilder = UsageEventIngestParams.builder();

for (int i = 0; i < 100; i++) {
    batchBuilder.addEvent(UsageEventIngestParams.Event.builder()
        .eventId("batch_event_" + i + "_" + System.currentTimeMillis())
        .customerId("cus_abc123")
        .eventName("video_transcode")
        .timestamp(OffsetDateTime.now().minusMinutes(i))
        .putMetadata("video_id", "video_" + i)
        .putMetadata("duration_seconds", String.valueOf(120 + i))
        .build());
}

UsageEventIngestResponse batchResponse = client.usageEvents().ingest(batchBuilder.build());
System.out.println("Batch processed: " + batchResponse.processedEvents() + " events");
```

## 错误处理

```java theme={null}
UsageEventIngestParams.Builder batchBuilder = UsageEventIngestParams.builder();

for (int i = 0; i < 100; i++) {
    batchBuilder.addEvent(UsageEventIngestParams.Event.builder()
        .eventId("batch_event_" + i + "_" + System.currentTimeMillis())
        .customerId("cus_abc123")
        .eventName("video_transcode")
        .timestamp(OffsetDateTime.now().minusMinutes(i))
        .putMetadata("video_id", "video_" + i)
        .putMetadata("duration_seconds", String.valueOf(120 + i))
        .build());
}

UsageEventIngestResponse batchResponse = client.usageEvents().ingest(batchBuilder.build());
System.out.println("Batch processed: " + batchResponse.ingestedCount() + " events");
```

```java theme={null}
import com.dodopayments.api.errors.*;

try {
    Payment payment = client.payments().retrieve("pay_invalid");
} catch (NotFoundException e) {
    System.err.println("Payment not found: " + e.getMessage());
} catch (UnauthorizedException e) {
    System.err.println("Authentication failed: " + e.getMessage());
} catch (PermissionDeniedException e) {
    System.err.println("Permission denied: " + e.getMessage());
} catch (BadRequestException e) {
    System.err.println("Invalid request: " + e.getMessage());
} catch (UnprocessableEntityException e) {
    System.err.println("Validation error: " + e.getMessage());
} catch (RateLimitException e) {
    System.err.println("Rate limit exceeded: " + e.getMessage());
    // SDK automatically retries with backoff
} catch (InternalServerException e) {
    System.err.println("Server error: " + e.getMessage());
} catch (DodoPaymentsServiceException e) {
    System.err.println("API error: " + e.statusCode() + " - " + e.getMessage());
}
```

<Tip>
  该 SDK 会在连接错误、408、409、429 和 5xx 错误时自动按指数退避重试请求。
</Tip>

## 异步操作

使用 CompletableFuture 进行异步操作：

```java theme={null}
import java.util.concurrent.CompletableFuture;

CompletableFuture<CheckoutSessionResponse> future = client.async()
    .checkoutSessions()
    .create(params);

// Handle response asynchronously
future.thenAccept(response -> {
    System.out.println("Session created: " + response.sessionId());
}).exceptionally(ex -> {
    System.err.println("Error: " + ex.getMessage());
    return null;
});
```

## Spring Boot 集成

### 配置类

```java theme={null}
import com.dodopayments.api.client.DodoPaymentsClient;
import com.dodopayments.api.client.okhttp.DodoPaymentsOkHttpClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DodoPaymentsConfig {
    
    @Value("${dodo.api.key}")
    private String apiKey;
    
    @Value("${dodo.environment:sandbox}")
    private String environment;
    
    @Bean
    public DodoPaymentsClient dodoPayments() {
        return DodoPaymentsOkHttpClient.builder()
            .bearerToken(apiKey)
            .baseUrl(environment.equals("live") 
                ? "https://live.dodopayments.com" 
                : "https://sandbox.dodopayments.com")
            .build();
    }
}
```

### 服务层

```java theme={null}
import com.dodopayments.api.client.DodoPaymentsClient;
import com.dodopayments.api.client.okhttp.DodoPaymentsOkHttpClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class DodoPaymentsConfig {
    
    @Value("${dodo.api.key}")
    private String apiKey;
    
    @Value("${dodo.environment:test}")
    private String environment;
    
    @Bean
    public DodoPaymentsClient dodoPayments() {
        return DodoPaymentsOkHttpClient.builder()
            .bearerToken(apiKey)
            .baseUrl(environment.equals("live") 
                ? "https://live.dodopayments.com" 
                : "https://test.dodopayments.com")
            .build();
    }
}
```

## 资源

<CardGroup cols={2}>
  <Card title="GitHub Repository" icon="github" href="https://github.com/dodopayments/dodopayments-java">
    查看源代码并贡献
  </Card>

  <Card title="API Reference" icon="book" href="/api-reference/introduction">
    完整的 API 文档
  </Card>

  <Card title="Discord Community" icon="discord" href="https://discord.gg/bYqAp4ayYh">
    获取帮助并与开发者交流
  </Card>

  <Card title="Report Issues" icon="bug" href="https://github.com/dodopayments/dodopayments-java/issues">
    报告错误或请求功能
  </Card>
</CardGroup>

## 支持

需要 Java SDK 的帮助吗？

* **Discord**：加入我们的 [社区服务器](https://discord.gg/bYqAp4ayYh) 获取实时支持
* **电子邮件**：通过 [support@dodopayments.com](mailto:support@dodopayments.com) 联系我们
* **GitHub**：在 [仓库](https://github.com/dodopayments/dodopayments-java) 上打开一个问题

## 贡献

我们欢迎贡献！请查看 [贡献指南](https://github.com/dodopayments/dodopayments-java/blob/main/CONTRIBUTING.md) 开始。

## 贡献

我们欢迎贡献！请查看[贡献指南](https://github.com/dodopayments/dodopayments-java/blob/main/CONTRIBUTING.md)以开始。