Java实现对cookie的增删改查

        /**

*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

;

}

}

}

}

/**

*根据名字获取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

;

}  

}

/**

*将cookie封装到Map里面

*@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;

}