1. [代碼]基於springMVC框架下寫的
/**
* 讀取所有cookie
* 注意二、從客戶端讀取Cookie時，包括maxAge在內的其他屬性都是不可讀的，也不會被提交。瀏覽器提交Cookie時只會提交name與value屬性。maxAge屬性只被瀏覽器用來判斷Cookie是否過期
* @param request
* @param response
*/
@RequestMapping("/showCookies")
public void showCookies(HttpServletRequest request,HttpServletResponse response ){
Cookie[] cookies = request.getCookies();//這樣便可以獲取一個cookie數組
if (null==cookies) {
System.out.println("沒有cookie=========");
} else {
for(Cookie cookie : cookies){
System.out.println("name:"+cookie.getName()+",value:"+ cookie.getValue());
}
}
}
/**
* 添加cookie
* @param response
* @param name
* @param value
*/
@RequestMapping("/addCookie")
public void addCookie(HttpServletResponse response,String name,String value){
Cookie cookie = new Cookie(name.trim(), value.trim());
cookie.setMaxAge(30 * 60);// 設置爲30min
cookie.setPath("/");
System.out.println("已添加===============");
response.addCookie(cookie);
}
/**
* 修改cookie
* @param request
* @param response
* @param name
* @param value
* 注意一、修改、刪除Cookie時，新建的Cookie除value、maxAge之外的所有屬性，例如name、path、domain等，都要與原Cookie完全一樣。否則，瀏覽器將視爲兩個不同的Cookie不予覆蓋，導致修改、刪除失敗。
*/
@RequestMapping("/editCookie")
public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){
Cookie[] cookies = request.getCookies();
if (null==cookies) {
System.out.println("沒有cookie==============");
} else {
for(Cookie cookie : cookies){
if(cookie.getName().equals(name)){
System.out.println("原值爲:"+cookie.getValue());
cookie.setValue(value);
cookie.setPath("/");
cookie.setMaxAge(30 * 60);// 設置爲30min
System.out.println("被修改的cookie名字爲:"+cookie.getName()+",新值爲:"+cookie.getValue());
response.addCookie(cookie);
break;
}
}
}
}
/**
* 刪除cookie
* @param request
* @param response
* @param name
*/
@RequestMapping("/delCookie")
public void delCookie(HttpServletRequest request,HttpServletResponse response,String name){
Cookie[] cookies = request.getCookies();
if (null==cookies) {
System.out.println("沒有cookie==============");
} else {
for(Cookie cookie : cookies){
if(cookie.getName().equals(name)){
cookie.setValue(null);
cookie.setMaxAge(0);// 立即銷燬cookie
cookie.setPath("/");
System.out.println("被刪除的cookie名字爲:"+cookie.getName());
response.addCookie(cookie);
break;
}
}
}
}
2. [代碼]通常開發時先用以下的代碼將獲取的cookie進行封裝
/**
* 根據名字獲取cookie
* @param request
* @param name cookie名字
* @return
*/
public Cookie getCookieByName(HttpServletRequest request,String name){
Map<String,Cookie> cookieMap = ReadCookieMap(request);
if(cookieMap.containsKey(name)){
Cookie cookie = (Cookie)cookieMap.get(name);
return cookie;
}else{
return null;
}
}
/**
* 將cookie封裝到Map裏面
* @param request
* @return
*/
private Map<String,Cookie> ReadCookieMap(HttpServletRequest request){
Map<String,Cookie> cookieMap = new HashMap<String,Cookie>();
Cookie[] cookies = request.getCookies();
if(null!=cookies){
for(Cookie cookie : cookies){
cookieMap.put(cookie.getName(), cookie);
}
}
return cookieMap;
}