spring ai 实现 java mcp 示例 前提条件 Spring AI 支持 Spring Boot 3.4.x，建议选择1.0.0-M6+ 参考链接 https://docs.spring.io/spring-ai/reference/1.0/index.html https://github.com/springaialibaba/spring-ai-alibaba-examples/tree/main/spring-ai-alibaba-mcp-example https://github.com/spring-projects/spring-ai-examples/tree/main/model-context-protocol/weather