claude-api

# Claude API — Java > **注意：** Java SDK 通过注解类支持 Claude API 和测试版工具使用。目前 Java 暂不支持智能体 SDK。 ## 安装 Maven: xml com.anthropic anthropic-java 2.17.0 Gradle: groovy implementation("com.anthropic:anthropic-java:2.17.0") ## 客户端初始化 java import com.anthropic.client.AnthropicClient; import com.anthropic.client.okhttp.AnthropicOkHttpClient; // 默认（从环境变量读取 ANTHROPIC_API_KEY） AnthropicClient client = AnthropicOkHttpClient.fromEnv(); // 显式指定 API 密钥 AnthropicClient client = AnthropicOkHttpClient.builder() .apiKey("your-api-key") .build(); --- ## 基础消息请求 java import com.anthropic.models.messages.MessageCreateParams; import com.anthropic.models.messages.Message; import com.anthropic.models.messages.Model; MessageCreateParams params = MessageCreateParams.builder() .model(Model.CLAUDE_OPUS_4_6) .maxTokens(16000L) .addUserMessage("What is the capital of France?") .build(); Message response = client.messages().create(params); response.content().stream() .flatMap(block -> block.text().stream()) .forEach(textBlock -> System.out.println(textBlock.text())); --- ## 流式传输 java import com.anthropic.core.http.StreamResponse; import com.anthropic.models.messages.RawMessageStreamEvent; MessageCreateParams params = MessageCreateParams.builder() .model(Model.CLAUDE_OPUS_4_6) .maxTokens(64000L) .addUserMessage("Write a haiku") .build(); try (StreamResponse streamResponse = client.messages().createStreaming(params)) { streamResponse.stream() .flatMap(event -> event.contentBlockDelta().stream()) .flatMap(deltaEvent -> deltaEvent.delta().text().stream()) .forEach(textDelta -> System.out.print(textDelta.text())); } --- ## 思考 (Thinking) **自适应思考是 Claude 4.6+ 模型的推荐模式。** Claude 会动态决定何时思考以及思考多少。构建器有一个直接的 `.thinking(ThinkingConfigAdaptive)` 重载 — 无需手动包装联合类型。 java import com.anthropic.models.messages.ContentBlock; import com.anthropic.models.messages.MessageCreateParams; import com.anthropic.models.messages.Model; import com.anthropic.models.messages.ThinkingConfigAdaptive; MessageCreateParams params = MessageCreatePar