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SpringAI实战-8-RAG(检索增强生成)

SpringAI实战-8-RAG(检索增强生成)
AI时代到来,确实是可以让ai直接帮我做RAG
但是笔者还是认为作为程序员  了解AI究竟写了什么也是很重要的
总会有自己调试项目的时候的
这种情况下如果毫无根基学习困难程度就会陡增,不如给自己铺垫一下
我这也算是保守派了
到RAG结束   我的存稿(明明是AI生成然后自己改改)就算是发完了
以下正文:

定位: 完整串联 RAG 全流程,从文档导入到智能问答

核心概念依赖:

Embedding (向量化) → 语义检索 (Retrieval) → RAG (检索+增强+生成)

一、什么是RAG?

1.1 为什么需要RAG?

大模型有两个致命问题:

问题1: 知识过时- 训练数据有截止时间,不知道最新信息- 例如: 无法回答"2026年最新政策"问题2: 幻觉问题  - 会"一本正经地胡说八道"- 编造看似合理但错误的内容

RAG的解决方案: 开卷考试

闭卷考试 (普通对话):  用户问题 → 大模型凭记忆回答 → 可能错误/过时开卷考试 (RAG):  用户问题 → 先查资料 → 基于资料作答 → 有据可查

1.2 RAG = Retrieval + Augmented + Generation

┌──────────────────────────────────────────────────────┐│  1. Retrieval (检索)                                   ││     - 将用户问题转为向量                                ││     - 在向量数据库中找最相关文档                          │├──────────────────────────────────────────────────────┤│  2. Augmented (增强)                                   ││     - 把检索到的文档拼成上下文                           ││     - 构建增强版Prompt: 参考资料 + 问题                  │├──────────────────────────────────────────────────────┤│  3. Generation (生成)                                  ││     - 把增强Prompt发给大模型                            ││     - 大模型基于上下文生成准确回答                        │└──────────────────────────────────────────────────────┘

二、完整RAG流程

2.1 两阶段架构

阶段一: 知识库准备 (离线)  原始文档 → 分块 → 向量化 → 存入数据库阶段二: 智能问答 (在线)  用户问题 → 检索 → 增强Prompt → AI回答

2.2 技术栈

文档分块: TokenTextSplitter (Spring AI)向量化:   EmbeddingModel (阿里云)存储:     PGVector (PostgreSQL)检索:     余弦相似度 (ORDER BY embedding <=> ?)生成:     ChatModel (DeepSeek)

三、阶段一: 文档导入与分块

3.1 为什么要分块?

问题: 一篇文档可能几千字,直接向量化会怎样?- Embedding API有长度限制- 整篇文档一个向量,检索精度差- 检索到整篇文档,上下文太多干扰AI解决: 切成小块,每块独立向量化- 每块500 Token,精准定位知识点- 检索时只返回相关片段,减少噪声

3.2 核心代码

RagService.importDocument()

public DocumentImportResponse importDocument(DocumentImportRequest request) {    // 阶段1: 文档分块    org.springframework.ai.document.Document sourceDoc =         new org.springframework.ai.document.Document(request.getContent());    TokenTextSplitter splitter = new TokenTextSplitter();    List<org.springframework.ai.document.Document> chunks =         splitter.apply(List.of(sourceDoc));    // 阶段2: 批量向量化    for (org.springframework.ai.document.Document chunk : chunks) {        float[] embeddingArray = embeddingModel.embed(chunk.getText());        String embeddingVector = VectorFormatUtil.formatToVector(embeddingArray);        Document docEntity = new Document();        docEntity.setContent(chunk.getText());        docEntity.setEmbedding(embeddingVector);        documentMapper.insert(docEntity);    }    return DocumentImportResponse.builder()        .totalChunks(chunks.size())        .message("文档导入成功,共切分为 " + chunks.size() + " 个知识块")        .build();}

3.3 调用示例

POST http://localhost:8080/api/rag/import{  "content""Spring Boot是由Pivotal团队提供的全新框架...[几千字]",  "metadata""{\"source\"\"官方文档\"\"category\"\"教程\"}"}

返回:

{  "success": true,  "totalChunks": 12,  "message": "文档导入成功,共切分为12个知识块",  "chunks": [    {      "id": 101,      "contentPreview": "Spring Boot是由Pivotal团队提供的...",      "contentLength": 485    }  ]}

四、阶段二: RAG智能问答

4.1 完整流程代码

RagService.query()

public RagResponse query(RagRequest request) {    // ========== 阶段1: Retrieval (检索) ==========    // 1.1 问题向量化    float[] queryEmbeddingArray = embeddingModel.embed(request.getQuery());    String queryEmbedding = VectorFormatUtil.formatToVector(queryEmbeddingArray);    // 1.2 语义检索 TopK    List<Document> relevantDocs = documentMapper.selectSimilarDocuments(        queryEmbedding, request.getTopK()    );    // ========== 阶段2: Augmentation (增强) ==========    // 2.1 拼接上下文    String context = buildContextFromDocuments(relevantDocs);    // 2.2 构建增强Prompt    String augmentedPrompt = buildAugmentedPrompt(context, request.getQuery());    // ========== 阶段3: Generation (生成) ==========    List<Message> messages = List.of(        new SystemMessage(systemPrompt),    // 角色定义        new UserMessage(augmentedPrompt)    // 参考资料 + 问题    );    Prompt prompt = new Prompt(messages);    ChatResponse chatResponse = chatModel.call(prompt);    String answer = chatResponse.getResult().getOutput().getText();    return RagResponse.builder()        .query(request.getQuery())        .answer(answer)        .sources(sources)        .augmentedPrompt(augmentedPrompt)        .build();}

4.2 关键技巧: Prompt模板

上下文构建:

private String buildContextFromDocuments(List<Document> documents) {    StringBuilder context = new StringBuilder();    for (int i = 0; i < documents.size(); i++) {        context.append("=== 参考资料 ").append(i + 1).append(" ===\n");        context.append(documents.get(i).getContent()).append("\n\n");    }    return context.toString();}

增强Prompt:

private String buildAugmentedPrompt(String context, String question) {    return """        请根据以下参考资料回答问题:        %s        问题: %s        请回答:        """.formatted(context, question);}

系统提示词:

private static final String DEFAULT_SYSTEM_PROMPT = """    你是一个专业的知识问答助手。请根据以下提供的参考资料来回答用户的问题。    回答要求:    1. 仅基于提供的参考资料进行回答,不要编造信息    2. 如果参考资料不足以回答问题,请明确告知用户    3. 回答要准确、简洁、有条理    """;

4.3 调用示例

POST http://localhost:8080/api/rag/query{  "query""Spring Boot的核心特性是什么?",  "topK": 5}

返回:

{  "query""Spring Boot的核心特性是什么?",  "answer""根据参考资料,Spring Boot的核心特性包括:\n1. 自动配置...\n2. 内嵌服务器...",  "sources": [    {      "id"101,      "content""Spring Boot提供了自动配置机制...",      "similarityDistance"0.12,      "metadata""{\"source\"\"官方文档\"}"    }  ],  "augmentedPrompt""请根据以下参考资料回答问题:\n=== 参考资料 1 ===\n..."}

五、效果对比

5.1 普通对话 vs RAG

维度
普通对话
RAG
知识来源
训练数据 (可能过时)
实时检索知识库
准确性
可能产生幻觉
基于真实资料
可追溯
无法知道依据
返回参考来源
适用场景
通用问答
专业领域问答

5.2 实际测试

问题: "2026年Spring AI最新版本是什么?"

普通对话:

 "Spring AI最新版本是1.0.0..." (可能是过时信息)

RAG对话:

 "根据知识库中的官方文档,Spring AI最新版本是1.1.2,发布于2026年3月。"

📎 参考来源: [文档#105] Spring AI 1.1.2 Release Notes...


六、核心要点总结

6.1 RAG三阶段

Retrieval 问题向量化 → 语义检索 → 相关文档Augmented 拼接上下文 → 构建增强PromptGeneration系统提示词 → AI生成 → 返回答案

6.2 关键技术点

1.文档分块: TokenTextSplitter按Token切分,避免过长/过短2.统一向量模型: 导入和检索必须用同一个Embedding模型3.Prompt设计: 明确区分参考资料和问题,引导AI基于上下文回答4.溯源机制: 返回来源文档,增强可信度

6.3 项目文件结构

src/main/java/com/springailearn/├── service/│   └── RagService.java              # RAG核心逻辑├── controller/│   └── RagController.java           # REST接口└── model/    ├── RagRequest.java              # 请求对象    ├── RagResponse.java             # 响应对象    ├── DocumentImportRequest.java   # 导入请求    └── DocumentImportResponse.java  # 导入响应API接口:POST /api/rag/import   # 导入文档POST /api/rag/query    # RAG问答

References

[1] SpringAI实战-6-Embedding向量基础: ./SpringAI实战-6-Embedding向量基础.md[2] SpringAI实战-7-RAG之R(Retrieval)语义检索: ./SpringAI实战-7-RAG之R(Retrieval)语义检索.md

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-04-12 08:50:42 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/511987.html
  2. 运行时间 : 0.101665s [ 吞吐率:9.84req/s ] 内存消耗:5,010.66kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=2c20e48f1562ae1520382fb87713645b
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  1. CONNECT:[ UseTime:0.000470s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000298s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000251s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000472s ]
  6. SELECT * FROM `set` [ RunTime:0.000192s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000493s ]
  8. SELECT * FROM `article` WHERE `id` = 511987 LIMIT 1 [ RunTime:0.000425s ]
  9. UPDATE `article` SET `lasttime` = 1775955042 WHERE `id` = 511987 [ RunTime:0.001260s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000227s ]
  11. SELECT * FROM `article` WHERE `id` < 511987 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000396s ]
  12. SELECT * FROM `article` WHERE `id` > 511987 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000361s ]
  13. SELECT * FROM `article` WHERE `id` < 511987 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000866s ]
  14. SELECT * FROM `article` WHERE `id` < 511987 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000834s ]
  15. SELECT * FROM `article` WHERE `id` < 511987 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004212s ]
0.105848s