RequestContextHolder 工具类中存有我们的 request请求对象  response响应对象  session对象

我们程序员可以在项目的任何方法中获取，方便我们使用,从而不需要在形参上面注入才能获取到对象

 

package com.gzcgxt.http;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

/**
 * SpringMVC提供工具类 RequestContextHolder使用
 * <p>Title: RequestContextHolderController</p>
 * <p>Description: </p>
 * <p>Company: www.baidu.com</p> 
 * @author    刘诗华 微信:15390725037
 * @date    2019-7-16下午9:42:55
 * @version 1.0
 */
//RequestContextHolder-->ServletRequestAttributes-->HttpServletRequest

@Controller
public class RequestContextHolderController {
    
    /**
     * 获取请求参数
     * <p>Title: req</p>
     * <p>Description: </p>
     * @return
     */
    @RequestMapping("/req")
    public String req() 
    {
        //获取 RequestAttributes 子类对象强转(ServletRequestAttributes)
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes();
        //获取请求参数
        HttpServletRequest request = attributes.getRequest();

        return "";
    }
    
}

 

实际项目中的 User工具类