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Spring AI学习笔记四十九:模型上下文协议(MCP)

  • 2026-03-14 14:52:46
Spring AI学习笔记四十九:模型上下文协议(MCP)

模型上下文协议(MCP)是一种标准化协议,它使人工智能模型能够以结构化的方式与外部工具和资源进行交互。你可以将其视为人工智能模型与现实世界之间的桥梁,通过它,模型可以通过一致的接口访问数据库、应用程序编程接口(API)、文件系统和其他外部服务。它支持多种传输机制,以在不同环境中提供灵活性。数据格式与协议

MCP Java SDK提供了模型上下文协议的Java实现,通过同步和异步通信模式,实现了与人工智能模型和工具的标准化交互。

Spring AI通过专用的引导启动器和MCP Java注解为MCP提供全面支持,使得构建能够无缝连接到外部系统的复杂AI驱动应用程序变得前所未有的简单。这意味着Spring开发人员可以参与到MCP生态系统的两个方面——构建使用MCP服务器的AI应用程序,以及创建向更广泛的AI社区提供基于Spring的服务的MCP服务器。使用Spring Initializer,借助MCP支持快速启动您的AI应用程序。

MCP Java SDK 架构

Java MCP实现遵循三层架构,该架构将可维护性和灵活性方面的关注点进行了分离:

客户端/服务器层(顶层)

顶层处理主要的应用逻辑和协议操作:

  • McpClient - 管理客户端操作和服务器连接

  • McpServer - 负责处理服务器端的协议操作和客户端请求

  • 这两个组件都利用下面的会话层来进行通信管理

会话层(中间层)

中间层负责管理通信模式并维护连接状态:

  • McpSession - 核心会话管理接口

  • McpClientSession - 特定于客户端的会话实现

  • McpServerSession - 特定于服务器的会话实现

传输层(底层)

底层负责实际的消息传输和序列化:编程

  • McpTransport - 管理JSON-RPC消息的序列化和反序列化

  • 支持多种传输实现(STDIO、HTTP/SSE、Streamable-HTTP等)

  • 为所有更高级别的通信奠定基础

MCP客户端

MCP客户端是模型上下文协议(MCP)架构中的关键组件,负责建立和管理与MCP服务器的连接。它实现了协议的客户端部分,处理以下任务:

  • 协议版本协商,以确保与服务器兼容

  • 通过能力协商来确定可用功能

  • 消息传输和JSON-RPC通信

  • 工具发现与执行

  • 资源访问与管理

  • 提示系统交互

  • 可选功能:

  • 根系管理

  • 采样支持

  • 同步操作和异步操作

  • 交通选择:

  • 基于标准输入/输出(Stdio)的传输,用于基于进程的通信

  • 基于Java HttpClient的SSE客户端传输

  • 用于响应式HTTP流的WebFlux SSE客户端传输

MCP服务器

MCP服务器是模型上下文协议(MCP)架构中的基础组件,它为客户提供工具、资源和能力。它实现了协议的服务器端,负责:

  • 服务器端协议操作实现

  • 工具展示与发现

  • 基于URI访问的资源管理

  • 提示模板的提供与处理

  • 与客户进行能力协商

  • 结构化日志记录和通知

  • 并发客户端连接管理

  • 同步和异步API支持

  • 传输实现:

  • 标准输入输出、可流式处理的HTTP、无状态可流式处理的HTTP、服务器推送事件(SSE)

Spring AI MCP 集成

Spring AI 通过以下 Spring Boot 启动器提供 MCP 集成:

客户端启动器

  • spring-ai-starter-mcp-client - 提供STDIO、基于Servlet的流式HTTP、无状态流式HTTP和SSE支持的核心启动器

  • spring-ai-starter-mcp-client-webflux - 基于WebFlux的流式HTTP、无状态流式HTTP和SSE传输实现

服务端启动器

STDIO

服务器类型
依赖
属性

Standard Input/Output (STDIO)

spring-ai-starter-mcp-server

spring.ai.mcp.server.stdio=true

WebMVC

服务器类型

依赖

属性

SSE WebMVC

spring-ai-starter-mcp-server-webmvc

spring.ai.mcp.server.protocol=SSE or empty

Streamable-HTTP WebMVC

spring-ai-starter-mcp-server-webmvc

spring.ai.mcp.server.protocol=STREAMABLE

Stateless Streamable-HTTP WebMVC

spring-ai-starter-mcp-server-webmvc

spring.ai.mcp.server.protocol=STATELESS

WebMVC (Reactive)

服务器类型

依赖

属性

SSE WebFlux

spring-ai-starter-mcp-server-webflux

spring.ai.mcp.server.protocol=SSE or empty

Streamable-HTTP WebFlux

spring-ai-starter-mcp-server-webflux

spring.ai.mcp.server.protocol=STREAMABLE

Stateless Streamable-HTTP WebFlux

spring-ai-starter-mcp-server-webflux

spring.ai.mcp.server.protocol=STATELESS

Spring AI MCP注释

除了可编程的MCP客户端和服务器配置外,Spring AI还通过MCP Annotations模块为MCP服务器和客户端提供基于注释的方法处理。这种方法使用带有Java注释的干净、声明性编程模型简化了MCP操作的创建和注册。

MCP注释模块使开发人员能够:

  • 使用简单的注释创建MCP工具、资源和提示

  • 以声明方式处理客户端通知和请求

  • 减少样板代码并提高可维护性

  • 自动为工具参数生成JSON模式

  • 访问特殊参数和上下文信息

主要特征包括:

  • 服务器注释:@McpTool、@McpResource、@McpPrompt、@McpComplete

  • 客户端注释:@McpLogging、@McpSampling、@McpElicitation、@McpProgress

  • 特殊参数:McpSyncServerExchange、McpAsyncServerExchange、McpTransportContext、McpMeta

  • 自动发现:可配置包包含/排除的注释扫描

  • Spring Boot集成:与MCP Boot Starters无缝集成

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  122. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-orm/src/db/concern/TableFieldInfo.php ( 2.63 KB )
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  1. CONNECT:[ UseTime:0.001134s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001602s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000727s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000662s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001311s ]
  6. SELECT * FROM `set` [ RunTime:0.000521s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001468s ]
  8. SELECT * FROM `article` WHERE `id` = 474121 LIMIT 1 [ RunTime:0.001088s ]
  9. UPDATE `article` SET `lasttime` = 1773563607 WHERE `id` = 474121 [ RunTime:0.044818s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.008977s ]
  11. SELECT * FROM `article` WHERE `id` < 474121 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001305s ]
  12. SELECT * FROM `article` WHERE `id` > 474121 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001220s ]
  13. SELECT * FROM `article` WHERE `id` < 474121 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005927s ]
  14. SELECT * FROM `article` WHERE `id` < 474121 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002520s ]
  15. SELECT * FROM `article` WHERE `id` < 474121 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011333s ]
0.251762s