本文将通过具体示例演示如何通过Spring Boot 2.7.2框架调用DeepSeek的API服务。我们将使用Java 11和最新的Spring Boot 2.7.2版本实现完整的集成流程。

前置准备

1. 有效的DeepSeek API密钥(密钥注册地址)
2. JDK 11或更高版本
3. Maven 3.6.3
4. Postman（用于API测试验证）
   详细可见官方DeepSeek API文档

步骤1：创建Spring Boot项目

通过Spring Initializr创建项目：

• Project: Maven
• Language: Java
• Packaging: Jar
• Java Version: 11
• Dependencies:
  • Spring Web
  • Lombok
  • Jackson Databind

java">    <dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.15.3</version> <!-- 可替换为最新版本 --></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-webflux</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.20</version><scope>provided</scope>
</dependency>

步骤2：配置API参数

在application.yml中添加配置：

deepseek:api:base-url: https://api.deepseek.com/v1chat-endpoint: /v1/chat/completionsapi-key: your_api_key_here

步骤3：创建请求/响应DTO

java">// 请求体
@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class ChatRequest {private String model;private List<Message> messages;private double temperature;@Data@Builder@NoArgsConstructor@AllArgsConstructorpublic static class Message {private String role;private String content;}
}// 响应体
@Data
public class ChatResponse {private String id;private String object;private long created;private List<Choice> choices;@Datapublic static class Choice {private Message message;private int index;private String finish_reason;@Datapublic static class Message {private String role;private String content;}}
}

步骤4：实现API客户端

java">package com.tianwen.service.impl;import com.tianwen.deepseekDTO.ChatRequest;
import com.tianwen.deepseekDTO.ChatResponse;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.http.HttpEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.reactive.function.client.WebClient;import javax.annotation.PostConstruct;@Service
public class DeepSeekLegacyClient {@Value("${deepseek.api.api-key}")private String apiKey;@Value("${deepseek.api.base-url}")private String baseUrl;private RestTemplate restTemplate;@Autowiredprivate RestTemplateBuilder builder;@PostConstruct  // 确保依赖注入完成后执行public void init() {this.restTemplate = builder.rootUri(baseUrl).defaultHeader("Authorization", "Bearer " + apiKey).build();}public DeepSeekLegacyClient(RestTemplateBuilder builder) {this.restTemplate = builder.rootUri(baseUrl).defaultHeader("Authorization", "Bearer " + apiKey).build();}public ChatResponse chatCompletion(ChatRequest request) {String fullUrl = baseUrl + "/chat/completions";  // 手动拼接完整路径HttpEntity<ChatRequest> entity = new HttpEntity<>(request);ResponseEntity<ChatResponse> response = restTemplate.postForEntity(fullUrl,entity,ChatResponse.class);return response.getBody();}
}@Configuration
public class WebClientConfig {@Value("${deepseek.api.base-url}")private String baseUrl;@Value("${deepseek.api.api-key}")private String apiKey;@Beanpublic WebClient webClient() {return WebClient.builder().baseUrl(baseUrl).defaultHeader("Authorization", "Bearer " + apiKey).defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE).build();}
}

步骤5：创建控制器

java">@RestController
@RequestMapping("/api/chat")
@RequiredArgsConstructor
public class ChatController {private final DeepSeekClient deepSeekClient;@PostMappingpublic ResponseEntity<ChatResponse> chat(@RequestBody ChatRequest request) {return ResponseEntity.ok(deepSeekClient.chatCompletion(request));}
}

步骤6：异常处理

全局异常处理器：

java">@RestControllerAdvice
public class GlobalExceptionHandler {// 修改WebClient异常处理@ExceptionHandler(WebClientResponseException.class)public ResponseEntity<String> handleWebClientErrors(WebClientResponseException ex) {return ResponseEntity.status(ex.getRawStatusCode()).body("API Communication Error: " + ex.getResponseBodyAsString());}
}

步骤7：测试验证

单元测试示例

java">@SpringBootTest
class DeepSeekClientTest {@Autowiredprivate DeepSeekClient client;@Testvoid testChatCompletion() {ChatRequest request = ChatRequest.builder().model("deepseek-chat").temperature(0.7).messages(List.of(new ChatRequest.Message("user", "你好，介绍一下你自己"))).build();ChatResponse response = client.chatCompletion(request);assertNotNull(response);assertFalse(response.getChoices().isEmpty());}
}

Postman测试请求

POST http://localhost:8080/api/chat
Headers:
Content-Type: application/jsonBody:
{"messages": [{"content": "如何学习java编程？","role": "user"}],"model": "deepseek-chat","temperature": 0.7
}

常见问题排查

1. 401 Unauthorized

   • 检查API密钥有效性
   • 验证Authorization头部格式

2. 序列化错误

   • 确认DTO字段命名与API文档一致
   • 检查Jackson注解配置

3. 超时问题

   • 调整连接超时设置
   • 检查网络防火墙配置

4. 速率限制

   • 实现令牌桶限流算法
   • 监控X-RateLimit-*响应头

5. 402 Payment Required 错误

   • API账户余额耗尽
   • API密钥未绑定有效支付方式
   • 请求参数触发了计费规则
   • ​模型调用超出免费额度