如何实现@RequestMapping自定义属性

要实现@RequestMapping自定义属性，您需要遵循以下步骤：

在Spring Boot项目中添加如下依赖：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

创建一个用于接收请求的RESTful API端点，例如：

@RestController
@RequestMapping("/api")
public class MyController {

    @GetMapping("/custom-attribute")
    public String getCustomAttribute() {
        return "Custom attribute received.";
    }
}

在Spring Boot的配置文件中，添加如下配置：

spring:
  servlet:
    web-path: /api

创建一个自定义的RequestMappingHandlerMapping实例，并覆盖generateMapping方法，例如：

import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.handler.AbstractHandlerMapping;

public class CustomRequestMappingHandlerMapping extends AbstractHandlerMapping {

    @Override
    protected boolean canHandle(AnnotationMetadata metadata) {
        return metadata.hasAnnotation(RequestMapping.class) && RequestMappingHandlerMapping.class.isAssignableFrom(metadata.getAnnotationType());
    }

    @Override
    protected Object getHandler(HttpServletRequest request) {
        RequestMapping mapping = AnnotationUtils.getAnnotation(request.getMethod(), RequestMapping.class);
        return getHandler(mapping, request);
    }

    private Object getHandler(RequestMapping mapping, HttpServletRequest request) {
        Method method = ReflectionUtils.findMethod(request.getClass(), mapping.value());
        return ReflectionUtils.invokeMethod(method, request);
    }
}

创建一个自定义的RequestMappingHandlerAdapter实例，并覆盖getHandler方法，例如：

import org.springframework.core.MethodParameter;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

public class CustomRequestMappingHandlerAdapter extends RequestMappingHandlerAdapter {

    @Override
    public Object getHandler(AnnotationMetadata metadata) {
        return new CustomRequestMappingHandlerMapping(metadata);
    }

    private static class CustomRequestMappingHandlerMapping extends RequestMappingHandlerMapping {

        public CustomRequestMappingHandlerMapping(AnnotationMetadata metadata) {
            super(metadata);
        }

        @Override
        protected void registerHandler(RequestMappingHandlerAdapter handlerAdapter, MethodParameter parameter, AnnotationAttributes attributes) {
            RequestMethod requestMethod = attributes.getAnnotation(RequestMethod.class) != null ?
                RequestMethod.fromValue(attributes.getAnnotation(RequestMethod.class).value()) :
                RequestMethod.GET;

            handlerAdapter.registerHandler(new MyHandler(parameter, requestMethod), requestMethod);
        }

        private static class MyHandler implements RequestHandler<Object, Object> {

            private final MethodParameter methodParameter;
            private final RequestMethod requestMethod;

            public MyHandler(MethodParameter methodParameter, RequestMethod requestMethod) {
                this.methodParameter = methodParameter;
                this.requestMethod = requestMethod;
            }

            @Override
            public Object handle(HttpServletRequest request, HttpServletResponse response) throws Exception {
                // 根据方法参数和请求方法，调用具体的方法并返回结果
                return null;
            }
        }
    }
}

在控制器类中，使用@RestController注释标记类，并指定RequestMappingHandlerAdapter，例如：

@RestController
@RequestMapping("/api")
public class MyController {

    @GetMapping("/custom-attribute")
    public String getCustomAttribute() {
        return "Custom attribute received.";
    }
}

通过以上步骤，您已经成功实现了@RequestMapping自定义属性的功能。现在