Java实现对cookie的操作(增删改查)
[代码]基于springMVC框架下写的/*** 读取所有cookie
* 注意二、从客户端读取Cookie时，包括maxAge在内的其他属性都是不可读的，也不会被提交。浏览器提交Cookie时只会提交name与value属性。maxAge属性只被浏览器用来判断Cookie是否过期
* @param request
* @param response
*/
@RequestMapping("/showCookies")
public void showCookies(HttpServletRequest request,HttpServletResponse response ){
Cookie[] cookies = request.getCookies();//这样便可以获取一个cookie数组
if (null==cookies) {
System.out.println("没有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);// 设置为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、删除Cookie时，新建的Cookie除value、maxAge之外的所有属性，例如name、path、domain等，都要与原Cookie完全一样。否则，浏览器将视为两个不同的Cookie不予覆盖，导致修改、删除失败。
*/
@RequestMapping("/editCookie")
public void editCookie(HttpServletRequest request,HttpServletResponse response,String name,String value){
Cookie[] cookies = request.getCookies();
if (null==cookies) {
System.out.println("没有cookie==============");
} else {
for(Cookie cookie : cookies){
if(cookie.getName().equals(name)){
System.out.println("原值为:"+cookie.getValue());
cookie.setValue(value);
cookie.setPath("/");
cookie.setMaxAge(30 * 60);// 设置为30min
System.out.println("被修改的cookie名字为:"+cookie.getName()+",新值为:"+cookie.getValue());
response.addCookie(cookie);
break;
}
}
}
}
/**
* 删除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("没有cookie==============");
} else {
for(Cookie cookie : cookies){
if(cookie.getName().equals(name)){
cookie.setValue(null);
cookie.setMaxAge(0);// 立即销毁cookie
cookie.setPath("/");
System.out.println("被删除的cookie名字为:"+cookie.getName());
response.addCookie(cookie);
break;
}
}
}
}[代码]通常开发时先用以下的代码将获取的cookie进行封装/**
* 根据名字获取cookie
* @param request
* @param name cookie名字
* @return
*/
publicCookie 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;
}
}
/**
* 将cookie封装到Map里面
* @param request
* @return
*/
privateMap<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;
}
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