java - httpservletrequest getCookies() 或 getHeader()

Question

我想接受来自客户端的数据。每种方法的优缺点是什么？

HttpServletRequest request = retriveRequest();
Cookie [] cookies = request.getCookies();
for (Cookie cookie : cookies) {
     if ("my-cookie-name".equals(cookie.getName())) {
          String value = cookie.getValue();
         //do something with the cookie's value.
     }
}

或

String request.getHeader("header-name");

当我读到How are cookies passed in the HTTP protocol?

Cookies are passed as HTTP headers, both in the request (client -> server), and in the response (server -> client).

Answer 1

getCookies ，使您免于解析 Cookie header 字符串，并从中创建一个 java 对象。否则你将不得不做类似的事情:

String rawCookie = request.getHeader("Cookie");
String[] rawCookieParams = rawCookie.split(";");
for(String rawCookieNameAndValue :rawCookieParams)
{
  String[] rawCookieNameAndValuePair = rawCookieNameAndValue.split("=");
}
// so on and so forth.