RequestEntity封装请求报文的一种类型，需要在控制器方法的形参中设置该类型的形参，当前请求的 请求报文就会赋值给该形参，可以通过getHeaders()获取请求头信息，通过getBody()获取请求体信息

    image.png

    输出结果：

    请求头： [host:”localhost:8080”, user-agent:”Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0”, accept:”text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8”, accept-language:”zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2”, accept-encoding:”gzip, deflate”, content-length:”30”, origin:”http://localhost:8080“, connection:”keep-alive”, referer:”http://localhost:8080/SpringMVC_demo4/“, cookie:”Idea-54894405=5df032fa-c2c9-44c0-aa3f-d010f59d1b78”, upgrade-insecure-requests:”1”, sec-fetch-dest:”document”, sec-fetch-mode:”navigate”, sec-fetch-site:”same-origin”, sec-fetch-user:”?1”, Content-Type:”application/x-www-form-urlencoded;charset=UTF-8”]
    image.png