在拦截器中获取 url 路径里面 @PathVariable 的参数值

解决办法

Map pathVariables = (Map) request.getAttribute( HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE);  String classId = (String)pathVariables.get("classId"); 

示例接口

    // 获取某个班级下面的学生列表     @RequestMapping("/classes/{classId}/students")     public String list(@PathVariable String classId){          return "学生列表";     } 

完整示例

package com.example.demo;  import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;  import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.HandlerMapping; import org.springframework.web.servlet.ModelAndView;  import java.util.Map;  public class SpringMVCInterceptor implements HandlerInterceptor {   	@Override 	public boolean preHandle(HttpServletRequest request, 			HttpServletResponse response, Object handler) throws Exception { 		Map pathVariables = (Map) request.getAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE); 		String chatbotId = (String)pathVariables.get("classId"); 		System.out.println("classId: " + classId); 		if ("1234".equals(classId)) 			return true; 		return false; 	} 	 	 	@Override 	public void postHandle(HttpServletRequest request, 			HttpServletResponse response, Object handler, 			ModelAndView modelAndView) throws Exception { 		// TODO Auto-generated method stub 		 	}  	@Override 	public void afterCompletion(HttpServletRequest request, 			HttpServletResponse response, Object handler, Exception ex) 	throws Exception { 		// TODO Auto-generated method stub 		 	} 	 }  

 package com.example.demo;  import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.InterceptorRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;  @Configuration public class MvcInterceptorConfig extends WebMvcConfigurationSupport{        @Override     protected void addInterceptors(InterceptorRegistry registry) {         registry.addInterceptor(new SpringMVCInterceptor()).addPathPatterns("/chatbot/**");         super.addInterceptors(registry);     } }