通过反射的方式修改request中header的内容

import org.apache.catalina.servlet4preview.http.HttpServletRequest;

/**
 * 修改header信息，key-value键值对儿加入到header中
 * @param request
 * @param key
 * @param value
 */
private void updateHeaderInfo(HttpServletRequest request, String key, String value){
  try {
    RequestFacade requestFacade = (RequestFacade) request;
    Field requestInfo = requestFacade.getClass().getDeclaredField("request");
    requestInfo.setAccessible(true);
    Object o = requestInfo.get(request);
    Field coyoteRequest = o.getClass().getDeclaredField("coyoteRequest");
    coyoteRequest.setAccessible(true);
    Object o1 = coyoteRequest.get(o);
    Field headers = o1.getClass().getDeclaredField("headers");
    headers.setAccessible(true);
    MimeHeaders o2 = (MimeHeaders)headers.get(o1);
    o2.addValue(key).setString(value);
  } catch (Exception e) {
    e.printStackTrace();
  }
}