import java.util.Hashtable;

import java.util.Iterator;

import java.util.Set;

import javax.servlet.http.Cookie;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Cookie的操作类

 *

 *

 */

public class CookieHandler {

/**

* 创建cookie

*

* @param response

*            回应

* @param nameValues

*            存入cookie的键值对

* @param days

*            设置cookie的有效期

*/

public static void createCookie(HttpServletResponse response,

Hashtable<String, String> nameValues, int days) {

Set<String> set = nameValues.keySet();

Iterator<String> it = set.iterator();

for (; it.hasNext();) {

String name = (String) it.next();

String value = (String) nameValues.get(name);

// 生成新的cookie

Cookie cookie = new Cookie(name, value);

// 设置有效日期

cookie.setMaxAge(days * 24 * 60 * 60);

// 设置路径（默认）

cookie.setPath("/");

// 把cookie放入响应中

response.addCookie(cookie);

}

}

/**

* 读取Cookie

*

* @param request

* @return Hashtable 返回cookie的键值对

*/

public static Hashtable<String, String> getCookies(

HttpServletRequest request) {

Cookie[] cookies = request.getCookies();

Hashtable<String, String> cookieHt = new Hashtable<String, String>();

if (cookies.length > 0) {

for (int i = 0; i < cookies.length; i++) {

Cookie cookie = cookies[i];

cookieHt.put(cookie.getName(), cookie.getValue());

}

}

return cookieHt;

}

/**

* 修改cookie中指定键的值

*

* @param request

* @param name

*            指定的键

* @param value

*            值

*/

public static void setCookieValueByName(HttpServletRequest request,

String name, String value) {

Cookie[] cookies = request.getCookies();

if (cookies.length > 0) {

for (int i = 0; i > cookies.length; i++) {

if (name.equalsIgnoreCase(cookies[i].getName())) {

cookies[i].setValue(value);

}

}

}

}

/**

* 得到指定键的值

*

* @param request

* @param name

*            指定的键

* @return String 值

*/

public static String getCookieValueByName(HttpServletRequest request,

String name) {

Cookie[] cookies = request.getCookies();

String resValue = "";

if (cookies.length > 0) {

for (int i = 0; i > cookies.length; i++) {

if (name.equalsIgnoreCase(cookies[i].getName())) {

resValue = cookies[i].getValue();

}

}

}

return resValue;

}

/**

* 销毁cookie

*

* @param request

* @param response

*/

public static void deletesCookie(HttpServletRequest request,

HttpServletResponse response) {

Cookie[] cookies = request.getCookies();

if (cookies != null) {

for (int i = 0; i < cookies.length; i++) {

Cookie cookie = cookies[i];

// 销毁

cookie.setMaxAge(0);

response.addCookie(cookie);

}

}

}

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        Cookie cookie=new Cookie("name","Tom");

        //设置Maximum Age

        cookie.setMaxAge(1000);

        //设置cookie路径为当前项目路径

        cookie.setPath(request.getContextPath());

        //添加cookie

        response.addCookie(cookie);

    }