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实战|Spring +Milvus,Java也能实现的企业级文档问答RAG

  • 2026-02-06 11:25:29
实战|Spring +Milvus,Java也能实现的企业级文档问答RAG
在企业数字化转型的浪潮中,PDF、Word 等海量文档往往沉睡在各个业务系统中,形成“数据孤岛”,难以被智能系统高效利用。

那么,如何构建一个真正面向企业场景落地的 AI 应用,让 AI 成为企业的“智能助手”?本项目提供一套基于 Spring 框架的完整解决方案,结合文档 ETL、向量检索与 RAG 问答技术,覆盖从数据导入到智能对话的全链路实践。

与其他演示不同,本项目强调企业级能力建设——包括 API 安全控制、指标可观测性等工程化特性。借助 Spring 强大的生态系统与 Java 社区对“高可维护、高可扩展系统”的成熟支持,我们将打造一个真正适合在企业环境中上线运行的 AI 应用。

技术栈速览

  • 框架:Spring Boot 3.5.0 + Spring AI 1.0.0

  • 语言:Java 17(长期支持)

  • AI 模型:百度千帆(OpenAI 接口兼容)

  • 向量存储:Milvus(高性能语义检索)

  • 工具链:Docker、Micrometer、Testcontainers

环境配置避坑指南

示例代码仓库 https://github.com/topikachu/spring-ai-rag

# 验证 Docker 是否正常运行$ docker version$ docker ps

为什么选百度千帆?

  • 免费额度友好:ernie-3.5-128k 和 tao-8k 均可免费试用

  • 接口兼容:与 Spring AI 的 OpenAI 接口高度兼容,几乎零开发成本切换

  • 在线模型列表: https://console.bce.baidu.com/qianfan/ais/console/onlineService

  • 申请模型API Key: https://console.bce.baidu.com/iam/#/iam/apikey/list

关键配置(application.properties)

spring.ai.openai.base-url=https://qianfan.baidubce.comspring.ai.openai.chat.completions-path=/v2/chat/completionsspring.ai.openai.chat.options.model=ernie-3.5-128kspring.ai.openai.embedding.embeddings-path=/v2/embeddingsspring.ai.openai.embedding.options.model=tao-8kspring.ai.openai.api-key=${OPENAI_API_KEY}spring.ai.model.embedding=openai

实操建议

  • 用在线模型API工具验证密钥有效性,再接入项目。

  • tao-8k 嵌入模型仅支持单条输入,需调整分块逻辑,确保每次请求一个文档段落,下文有代码示例。

  • 不要在代码或者配置文件里硬编码API KEY,更不要提交到代码仓库,在生产中考虑使用环境变量。

  文档 ETL:非结构化数据结构化处

处理流程:

  • DocReader:使用 TikaDocReader 读取 PDF/Word 等

  • TextSplitter:基于 token 分块,控制上下文长度

  • 向量生成:调用 tao-8k 接口

  • 存入向量库:Milvus 自动管理

示例代码:

  return documentReader.getDocuments()          .flatMap(document -> {            var processChunks = Mono.fromRunnable(() -> {              var chunks = textSplitter.apply(List.of(document));              vectorStore.write(chunks); // expensive operation            }).subscribeOn(Schedulers.boundedElastic());            return Flux.concat(                    Flux.just(document),                    processChunks.then(Mono.empty())            );          })          .doOnComplete(() -> log.info("RunIngestion() finished"))          .doOnError(e -> log.error("Error during ingestion", e));}

注意:百度千帆嵌入 API 仅支持单文档请求,需确保 ETL 实现为“单文档单请求”。

@BeanBatchingStrategy singleDocumentBatchingStrategy() {  return documents -> documents.stream().map(List::of).toList();}

向量存储:用 Milvus 实现“秒级语义检索”

配置示例:

spring.ai.vectorstore.milvus.initialize-schema=truespring.ai.vectorstore.milvus.embedding-dimension=1024

说明:例如用户问“刘备结义排第几”,Milvus 会返回相关文档段落,再由语言模型生成自然语言答案。

RAG 对话:结合知识库与上下文的智能问答

核心逻辑:

  • 用户提问

  • 向量检索相关段落

  • 载对话记忆(Redis)

  • 生成 AI 回答

对话向量检索与记忆集成示例:

public ChatClient.ChatClientRequestSpec input(String userInput, String conversationId) {  return ChatClient.builder(chatModel)          .build().prompt()          .advisors(                  new QuestionAnswerAdvisor(vectorStore),                  MessageChatMemoryAdvisor.builder(chatMemory).build()          )          .advisors(spec -> spec.param(CONVERSATION_ID, conversationId))          .user(userInput);}

提升前端体验:使用stream接口返回Flux,通过SSE实现打字机效果:

public Flux<Stringstream(String userInput, String conversationId) {    return input(userInput, conversationId)            .stream().content();}
@PostMapping(path = "/chat", produces = MediaType.TEXT_EVENT_STREAM_VALUE)public Flux<Stringchat(@RequestBody ChatRequest chatRequest, @RequestParam() String conversationId, Principal principal) {  var conversationKey = String.format("%s:%s", principal.getName(), conversationId);  return chatService.stream(chatRequest.userInput, conversationKey)          .doOnError(exp -> log.error("Error in chat", exp));}

API 安全加固

权限控制示例:

@Overrideprotected void configure(HttpSecurity http) throws Exception {    http        .httpBasic()        .and()        .authorizeRequests(authz -> authz            .antMatchers("/api/v1/index").hasRole("ADMIN")            .anyRequest().authenticated()        );}

企业级加固:在正式的生产环境中建议升级为OAuth2/JWT认证方案。

系统可观察性

链路追踪:本项目使用OpenTelemetry JavaAgent,覆盖Chat → Milvus → 模型调用的全链路调用追踪(grpc调用链关键

-javaagent:<path/to/opentelemetry-javaagent.jar> \-Dotel.metrics.exporter=none \-Dotel.logs.exporter=none

指标监控:使用Micrometer自动暴露Prometheus指标,比如:

  • 模型响应时间

# HELP gen_ai_client_operation_seconds  # TYPE gen_ai_client_operation_seconds summarygen_ai_client_operation_seconds_count{...} 1
  • 向量检索耗时

# HELP db_vector_client_operation_seconds# TYPE db_vector_client_operation_seconds summarydb_vector_client_operation_seconds_count{...} 1

配置:

management.endpoints.web.exposure.include=prometheus

Tip:Spring Boot 3.2 引入 OTEL starter,但由于不能覆盖 gRPC(Milvus client)调用链,本项目采用 JavaAgent 接入方式,以确保完整链路追踪。

export OPENAI_API_KEY=<百度千帆APIKEY>mvn clean test packagedocker compose up -djava -javaagent:target/otel/opentelemetry-javaagent.jar -Dotel.metrics.exporter=none -Dotel.logs.exporter=none  -Dinput.directory=$PWD/src/test/resources/corpus  -jar target/rag-0.0.1-SNAPSHOT.jarcurl --location 'localhost:8080/api/v1/index' \--user "admin:password" \--header 'Content-Type: application/json' \--data '{}'curl --location 'localhost:8080/api/v1/chat?conversationId=liubei' \--header 'Content-Type: application/json' \--user "user:password" \--data '{    "userInput": "刘备结义时排第几?"}'curl --location 'localhost:8080/api/v1/chat?conversationId=liubei' \--header 'Content-Type: application/json' \--user "user:password" \--data '{    "userInput": "他哪里人?"}'curl --location 'localhost:8080/api/v1/chat?conversationId=guanyu' \--header 'Content-Type: application/json' \--user "user:password" \--data '{    "userInput": "关羽结义时排第几?"}'curl --location 'localhost:8080/api/v1/chat?conversationId=guanyu' \--header 'Content-Type: application/json' \--user "user:password" \--data '{    "userInput": "他哪里人?"}'curl "http://localhost:8080/actuator/prometheus"

打开trace 界面 http://localhost:16686/,可以查看调用的tracing情况,如下图

从文档解析到智能对话,这个项目不仅仅是技术的堆叠,更是一次工程实践与 AI 认知的结合。通过 Spring AI + 向量数据库 + 企业级安全与可观测性,真正打通了“知识沉淀 → 智能服务”的链路。

如果你也在探索 AI 与企业系统的融合,欢迎留言交流,一起构建更智能、更可靠的未来系统

作者介绍

龚禕

上海微福思(原HP软件部) 系统架构师

Milvus开源社区积极参与者

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  1. CONNECT:[ UseTime:0.000629s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000513s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000291s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000463s ]
  6. SELECT * FROM `set` [ RunTime:0.000239s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000550s ]
  8. SELECT * FROM `article` WHERE `id` = 466423 LIMIT 1 [ RunTime:0.000405s ]
  9. UPDATE `article` SET `lasttime` = 1770519898 WHERE `id` = 466423 [ RunTime:0.006136s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 466423 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000342s ]
  12. SELECT * FROM `article` WHERE `id` > 466423 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001144s ]
  13. SELECT * FROM `article` WHERE `id` < 466423 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009366s ]
  14. SELECT * FROM `article` WHERE `id` < 466423 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002262s ]
  15. SELECT * FROM `article` WHERE `id` < 466423 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001813s ]
0.106584s