Java-Servlet操作Cookie

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本文介绍如何操作Servlet中的Cookie。

获取Request中的Cookie

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public static String getCookie(final HttpServletRequest request, final String name){
	final Cookie[] cookies = request.getCookies();
	if (cookies != null){
		for (final Cookie cookie : cookies){
			final String sName = cookie.getName();
			if (sName.equals(name))
				return cookie.getValue();
		}
	}
	return null;
}

往Response中写入Cookie

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protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	response.addCookie(new Cookie("id", "xiaoming"));
}

转换httpClient中的Cookie

httpClient中的Cookie操作，参考利用httpClient进行https访问，httpClient中的Cookie和servlet中的Cookie类型不同，需要进行转换:

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private static Cookie servletCookieFromApacheCookie(org.apache.http.cookie.Cookie apacheCookie) {
	if(apacheCookie == null) 
		  return null;
		   
	String name = apacheCookie.getName();
	String value = apacheCookie.getValue();
	Cookie cookie = new Cookie(name, value);

	value = apacheCookie.getDomain();
	if(value != null) 
		cookie.setDomain(value);

	value = apacheCookie.getPath();
	if(value != null) 
		cookie.setPath(value);

	value = apacheCookie.getComment();
	if(value != null) 
		cookie.setComment(value);
		  
	cookie.setVersion(apacheCookie.getVersion());
	Date expiryDate = apacheCookie.getExpiryDate();
	if(expiryDate != null) {
		long maxAge = (expiryDate.getTime() - System.currentTimeMillis()) / 1000;
		cookie.setMaxAge((int) maxAge);
	}

	return cookie;
}