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Spring AI 和 LangChain4j 终极选型:生产踩坑总结,看完不纠结

Spring AI 和 LangChain4j 终极选型:生产踩坑总结,看完不纠结

开头:别让工具拉开你的差距

很多 Java 程序员看到 AI 开发就本能地觉得 “那是 Python 的事”。但随着Spring AI、LangChain4j的成熟,让 Java 程序员在不离开自己技术栈的情况下,就能构建生产级的 AI 应用。

今天带你从零走完这条路:接入大模型、构建知识库、实现 Agent 自动化,每一步都有完整的 SpringBoot 代码,能直接跑通。


一、Spring AI 接入 vLLM

1.1 为什么是 vLLM?

很多教程直接对接 OpenAI,但国内生产环境大多数团队的选择是:私有化部署开源模型 + vLLM 作为推理服务。原因很简单:数据不出内网、成本可控、模型可定制。

vLLM 默认暴露的是OpenAI 兼容接口(/v1/chat/completions),这意味着所有支持 OpenAI 协议的客户端都可以无缝对接,Spring AI 就是其中之一。

1.2 环境准备

依赖版本:

  • SpringBoot 3.3.x

  • JDK 17+

  • Spring AI 1.0.0

pom.xml核心依赖:

<dependencyManagement>    <dependencies>        <dependency>            <groupId>org.springframework.ai</groupId>            <artifactId>spring-ai-bom</artifactId>            <version>1.0.0</version>            <type>pom</type>            <scope>import</scope>        </dependency>    </dependencies></dependencyManagement><dependencies>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-web</artifactId>    </dependency>    <dependency>        <groupId>org.springframework.ai</groupId>        <artifactId>spring-ai-openai-spring-boot-starter</artifactId>    </dependency></dependencies>
1.3 配置文件

application.yml:

spring:  ai:    openai:      base-url: http://IP:8000      api-key: "not-needed"      chat:        options:          model: /home/models/Qwen/Qwen3-14B-AWQ          temperature0.7          max-tokens: 2048

注意:model字段填的是 vLLM 启动时--model参数指定的路径,可通过curl http://IP:8000/v1/models确认。

1.4 最简对话:Hello AI

先跑通最基础的调用,建立信心:

@RestController@RequestMapping("/ai")public class ChatController {    private final ChatClient chatClient;    public ChatController(ChatClient.Builder builder) {        this.chatClient = builder.build();    }    @GetMapping("/chat")    public String chat(@RequestParam String message) {        return chatClient.prompt()                .user(message)                .call()                .content();    }}

启动项目,访问:

curl "http://localhost:8080/ai/chat?message=你好,用一句话介绍Spring AI"
1.5 流式输出(生产必备)

大模型响应慢是常识,流式输出(Streaming)是生产环境的标配

@GetMapping(value = "/chat/stream", produces = MediaType.TEXT_EVENT_STREAM_VALUE)public Flux<StringchatStream(@RequestParamString message) {    return chatClient.prompt()            .user(message)            .stream()            .content();}
1.6 带系统提示词的对话(业务场景核心)

实际业务中,你需要给模型设定角色和约束:

@RestController@RequestMapping("/ai")public class CustomerServiceController {    private final ChatClient chatClient;    private static final String SYSTEM_PROMPT = """            你是一名专业的电商客服助手,名字叫"小智"。            你的职责是:解答用户关于订单、物流、退换货的问题            回答简洁友好,每次回复不超过150字            """;    public CustomerServiceController(ChatClient.Builder builder) {        this.chatClient = builder.defaultSystem(SYSTEM_PROMPT).build();    }    @PostMapping("/customer-service")    public String customerService(@RequestBody ChatRequest request) {        return chatClient.prompt().user(request.message()).call().content();    }    public record ChatRequest(String message) {}}
1.7 多轮对话(带记忆)

要实现连续对话,需要引入会话记忆

@RestController@RequestMapping("/ai")public class MultiTurnChatController {    private final ChatClient chatClient;    private final Map<StringMessageWindowChatMemory> sessionMemory = new ConcurrentHashMap<>();    public MultiTurnChatController(ChatClient.Builder builder) {        this.chatClient = builder.build();    }    @PostMapping("/chat/multi-turn")    public String multiTurnChat(@RequestBodyMultiTurnRequest request) {        MessageWindowChatMemory memory = sessionMemory.computeIfAbsent(                request.sessionId(),                id -> MessageWindowChatMemory.withMaxMessages(10)        );        return chatClient.prompt()                .user(request.message())                .advisors(new MessageChatMemoryAdvisor(memory))                .call()                .content();    }    public record MultiTurnRequest(String sessionId, String message) {}}
1.8 结构化输出(告别解析 JSON 的痛苦)

Spring AI 支持直接将模型输出映射成 Java 对象:

@RestController@RequestMapping("/ai")public class OrderExtractController {    private final ChatClient chatClient;    public OrderExtractController(ChatClient.Builder builder) {        this.chatClient = builder.build();    }    @PostMapping("/extract-order")    public OrderInfo extractOrder(@RequestBody String userDescription) {        return chatClient.prompt()                .system("从用户的描述中提取订单相关信息...")                .user(userDescription)                .call()                .entity(OrderInfo.class);    }}

二、LangChain4j 接入 vLLM

2.1 LangChain4j 是什么?

如果说 Spring AI 是 “Spring 官方钦定的 AI 集成方案”,那 LangChain4j 就是 “Java 生态里最接近 LangChain 设计哲学的框架”。它的核心理念是:把 AI 应用开发中所有可复用的模式都抽象成组件,像搭积木一样组合

2.2 环境准备

pom.xml:

<dependencies>    <dependency>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-web</artifactId>    </dependency>    <dependency>        <groupId>dev.langchain4j</groupId>        <artifactId>langchain4j-spring-boot-starter</artifactId>        <version>0.36.2</version>    </dependency>    <dependency>        <groupId>dev.langchain4j</groupId>        <artifactId>langchain4j-open-ai-spring-boot-starter</artifactId>        <version>0.36.2</version>    </dependency></dependencies>
2.3 配置文件

application.yml:

langchain4j:  open-ai:    chat-model:      base-url: http://10.8.5.186:8000/v1      api-key: "not-needed"      model-name: /home/models/Qwen/Qwen3-14B-AWQ      temperature0.7      max-tokens: 2048      timeout120s      log-requests: true      log-responses: true
2.4 LangChain4j 的核心概念:AI Service

核心思想:用一个 Java 接口描述你的 AI 能力,框架自动实现它,就像 MyBatis 的 Mapper 接口一样:

@AiServicepublic interface AssistantService {    @SystemMessage("你是一名专业的Java技术顾问,回答简洁专业,不超过200字。")    String chat(String userMessage);}@RestController@RequestMapping("/ai")public class AssistantController {    @Autowired    private AssistantService assistantService;    @GetMapping("/chat")    public String chat(@RequestParamString message) {        return assistantService.chat(message);    }}
2.5 流式输出

通过返回类型TokenStream实现:

@AiServicepublic interface StreamingAssistantService {    @SystemMessage("你是一名helpful的AI助手。")    TokenStream chatStream(String userMessage);}@RestController@RequestMapping("/ai")public class StreamingController {    @Autowired    private StreamingAssistantService streamingAssistantService;    @GetMapping(value = "/chat/stream", produces = MediaType.TEXT_EVENT_STREAM_VALUE)    public SseEmitter chatStream(@RequestParam String message) {        SseEmitter emitter = new SseEmitter(120_000L);        streamingAssistantService.chatStream(message)                .onNext(token -> {                    try {                        emitter.send(SseEmitter.event().data(token));                    } catch (IOException e) {                        emitter.completeWithError(e);                    }                })                .onComplete(response -> {                    try {                        emitter.send(SseEmitter.event().name("done").data("[DONE]"));                        emitter.complete();                    } catch (IOException e) {                        emitter.completeWithError(e);                    }                })                .onError(emitter::completeWithError)                .start();        return emitter;    }}
2.6 多轮对话(带记忆)

直接在 AI Service 接口上声明即可:

@AiServicepublic interface MemoryChatService {    @SystemMessage("你是一名友好的AI助手,能记住用户在对话中提到的信息。")    String chat(@MemoryId String sessionId, @UserMessage String userMessage);}@Configurationpublic class LangChain4jConfig {    @Bean    ChatMemoryProvider chatMemoryProvider() {        return memoryId -> MessageWindowChatMemory.builder()                .id(memoryId)                .maxMessages(10)                .build();    }}@RestController@RequestMapping("/ai")public class MemoryChatController {    @Autowired    private MemoryChatService memoryChatService;    @PostMapping("/chat/memory")    public String memoryChat(@RequestBodyMemoryChatRequest request) {        return memoryChatService.chat(request.sessionId(), request.message());    }    public record MemoryChatRequest(String sessionId, String message) {}}
2.7 结构化输出

直接把返回类型改成 POJO,框架自动处理

public record ProductReview(        String productName,        Integer rating,        String sentiment,        List<String> highlights,        List<String> complaints) {}@AiServicepublic interface ReviewAnalysisService {    @SystemMessage("你是一名电商评论分析专家...")    ProductReview analyzeReview(String reviewText);}@RestController@RequestMapping("/ai")public class ReviewController {    @Autowired    private ReviewAnalysisService reviewAnalysisService;    @PostMapping("/analyze-review")    public ProductReview analyzeReview(@RequestBodyString reviewText) {        return reviewAnalysisService.analyzeReview(reviewText);    }}
2.8 动态系统提示词(模板变量)

系统提示词可根据业务参数动态生成:

@AiServicepublic interface DynamicAssistantService {    @SystemMessage("""            你是{{companyName}}的专属客服助手"{{botName}}"。            你只负责处理{{category}}类目的商品咨询。            当前促销活动:{{promotion}}            """)    String chat(            @V("companyName") String companyName,            @V("botName") String botName,            @V("category") String category,            @V("promotion") String promotion,            @UserMessage String userMessage    );}

三、选型对比:Spring AI vs LangChain4j,别纠结看场景

3.1 全景对比表
对比维度Spring AILangChain4j
主导方Spring 官方社区主导
上手成本极低,配置即用低,接口即契约
与 Spring 生态融合原生融合良好,有 Starter
工具调用成熟度支持,仍在完善强,核心设计之一
可测试性一般,需 Mock ChatClient强,直接 Mock 接口
适合场景快速集成、Spring 项目改造复杂 AI 应用、Agent 系统
3.2 核心差异深度解析
  • 编程哲学:Spring AI 是配置驱动(命令式),LangChain4j 是声明式(接口即契约)。

  • 工具调用:LangChain4j 的@Tool注解让模型自主决策调用,更接近 Agent 理念。

  • 可测试性:LangChain4j 的 AI Service 是接口,直接 Mock 即可,测试成本更低。

3.3 选型决策树
你的项目是否已经是Spring项目?├─ 否 → 选LangChain4j└─ 是   ├─ 需求简单(对话、问答)→ 选Spring AI   ├─ 需要工具调用、Agent → 选LangChain4j   └─ 不确定 → 直接用LangChain4j
3.4 可以共存吗?

可以,而且是务实的选择。两个框架可在同一项目中分工:Spring AI 负责简单对话、内容生成;LangChain4j 负责工具调用、Agent。

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  1. CONNECT:[ UseTime:0.000718s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001300s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000311s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000675s ]
  6. SELECT * FROM `set` [ RunTime:0.000283s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000594s ]
  8. SELECT * FROM `article` WHERE `id` = 532479 LIMIT 1 [ RunTime:0.001938s ]
  9. UPDATE `article` SET `lasttime` = 1776610680 WHERE `id` = 532479 [ RunTime:0.001761s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000226s ]
  11. SELECT * FROM `article` WHERE `id` < 532479 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000507s ]
  12. SELECT * FROM `article` WHERE `id` > 532479 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000476s ]
  13. SELECT * FROM `article` WHERE `id` < 532479 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000873s ]
  14. SELECT * FROM `article` WHERE `id` < 532479 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004588s ]
  15. SELECT * FROM `article` WHERE `id` < 532479 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001073s ]
0.178135s