获取请求头

方法一：

@RequestMapping("/getSingleHeader")
public Map<String, Object> getSingleHeader(@RequestHeader("user-id") String userId){
        Map<String, Object> result = new HashMap<>();
        result.put("code", 0);
        result.put("msg", "success");
        result.put("userId", userId);
        return result;
}

方法二：

 @RequestMapping("/getAllHeaders")
public Map<String, Object> listAllHeaders(@RequestHeader Map<String, String> headers) {
        Map<String, Object> result = new HashMap<>();
        headers.forEach((key, value) -> {
            // 日志中输出所有请求头
            System.out.println(String.format("Header '%s' = %s", key, value));
        });
        result.put("code", 0);
        result.put("msg", "success");
        result.put("headers", headers);
         return result;
}

方法三：

@RequestMapping("/listHeaders")
public Map<String, Object> listHeaders(@RequestHeader MultiValueMap<String, String> headers) {
        Map<String, Object> result = new HashMap<>();
        headers.forEach((key, value) -> {
             // 日志中输出所有请求头
            System.out.println(String.format("Header '%s' = %s", key, value));
        });
        result.put("code", 0);
        result.put("msg", "success");
        result.put("headers", headers);
        return result;
}

方法四：

@RequestMapping("/getAllHttpHeaders")
public Map<String, Object> getAllHttpHeaders(@RequestHeader HttpHeaders headers) {
        headers.forEach((key, value) -> {
             // 日志中输出所有请求头
            System.out.println(String.format("getAllHttpHeaders '%s' = %s", key, value));
        });
        Map<String, Object> result = new HashMap<>();
        result.put("code", 0);
        result.put("msg", "success");
        result.put("headers", headers);
        return result;
}

ps：查看源码就明白了