VIP31/springmvc-demo/src/main/java/com/sf/controller/HeaderController.java

package com.sf.controller;

import jakarta.servlet.http.HttpServletRequest;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/header")
public class HeaderController {

    // http://localhost:8080/springmvc_demo/header/header1
    @RequestMapping("/header1")
    public String header1(HttpServletRequest request) {
        // 从请求头中获取指定key
        String userAgent = request.getHeader("User-Agent");
        // 浏览器访问结果
        // Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36 Edg/124.0.0.0
        System.out.println(userAgent);
        // httpclient访问结果
        // IntelliJ HTTP Client/IntelliJ IDEA 2024.1
        // postcat访问结果
        // header1:Postcat
        return "header1:" + userAgent;
    }

    // http://localhost:8080/springmvc_demo/header/header2
    @RequestMapping("/header2")
    public String header2(@RequestHeader("User-Agent") String userAgent) {
        System.out.println(userAgent);
        return "header2:" + userAgent;
    }

}