SpringBoot获取Request和Response方法代码解析

@GetMapping(value = "")
public String center() {
  ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
  HttpServletRequest request = servletRequestAttributes.getRequest();
  HttpServletResponse response = servletRequestAttributes.getResponse();
  //...
}

@GetMapping(value = "")
public String center(HttpServletRequest request,HttpServletResponse response) {
  //...
}

@Autowired
private HttpServletRequest request;
@Autowired
private HttpServletResponse response;
@GetMapping(value = "")
public String center() {
  //...
}