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);
    }
}