• @RequestHeader是将请求头信息和控制器方法的形参创建映射关系
    • @RequestHeader注解一共有三个属性：value、required、defaultValue，用法同@RequestParam。

    image.png
    示例：
    HTML：

    1. <!DOCTYPE html>
    2. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    3. <head>
    4.     <meta charset="UTF-8">
    5.     <title>Title</title>
    6. </head>
    7. <body>
    8.     <h1>首页</h1>
    10.     <a th:href="@{/requestHeader}">获取请求头的host</a><br>
    12. </body>
    13. </html>

    Controller：

    package com.way.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletRequest;
import java.util.Arrays;

@Controller
public class MyController {

    @RequestMapping(value = "/requestHeader")
    public String testRequestHeader(@RequestHeader("Host") String host) {
        System.out.println(host);
        return "target";
    }
}

    idea结果：

    localhost:8080