【笔记】cookies管理工具类

package com.ulearning.ulms.util;import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.ulearning.ulms.core.utils.Constants;public class CookieUtil {
/*
* 从给定的request中查找cookie
*/
public static String getCookie(HttpServletRequest request,String cookieName){
String rt=null;
Cookie[] cookies = request.getCookies();
if(cookies!=null)
{ for (int i = 0; i < cookies.length; i++)
{
Cookie c = cookies[i];
if(c.getName().equalsIgnoreCase(cookieName))
{
rt= c.getValue();
break;
}
}
}
try {
if(rt !=null){
rt = URLDecoder.decode(rt,"utf-8");
}else{
rt = (String)request.getAttribute(cookieName);
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return rt;
}
/**
* 删除，某一个cookie
* @param request
* @param cookieName
* @return
*/ public static void clearCookie(HttpServletRequest request,HttpServletResponse response,String cookieName){
Cookie[] cookies = request.getCookies();
if(cookies!=null)
{ for (int i = 0; i < cookies.length; i++)
{
Cookie c = cookies[i];
if(!c.getName().equalsIgnoreCase(cookieName))
{
c.setValue(null);
c.setMaxAge(0);
c.setPath("/");
response.addCookie(c);
break;
}
}
}
} public static int getCookieInt(HttpServletRequest request,String cookieName){
int res = 0;
String rt=null;
Cookie[] cookies = request.getCookies();
if(cookies!=null)
{ for (int i = 0; i < cookies.length; i++)
{
Cookie c = cookies[i];
if(c.getName().equalsIgnoreCase(cookieName))
{
rt= c.getValue();
break;
}
}
}
try {
if(rt !=null)
{
rt = URLDecoder.decode(rt,"utf-8");
res = Integer.parseInt(rt);
}else{
rt = (String)request.getAttribute(cookieName);
res = rt!=null ? Integer.parseInt(rt) : 0;
}
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return res;
} public static void clearCookie(HttpServletRequest request,HttpServletResponse response){
String rt=null;
Cookie[] cookies = request.getCookies();
if(cookies!=null)
{
for (int i = 0; i < cookies.length; i++)
{
Cookie c = cookies[i];
if(!c.getName().equalsIgnoreCase(Constants.SHOPPING_CART_KEY))
{
c.setValue(null);
c.setMaxAge(0);
c.setPath("/");
response.addCookie(c);
/*rt= c.getValue();
break;*/
}
}
}
} //往cookie里面 写入值 name 是键 value 是 值
public static void addCookie(HttpServletResponse response, String name,
String value, int maxAge) {
try {
value=URLEncoder.encode(value,"UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} Cookie cookie = new Cookie(name, value);
if (maxAge > 0)
cookie.setMaxAge(maxAge);
cookie.setPath("/");
cookie.setComment("EXPIRING COOKIE at "+ System.currentTimeMillis());
response.addCookie(cookie);
} /**
* 方法描述：只从cookie中获取。如果不存在该cookie，返回null。
* @param request
* @param cookieName
* @return
* @author: Huyihui
* @version: 2012-9-25 上午11:03:04
*/
public static String getCookieOnly(HttpServletRequest request, String cookieName) {
Cookie[] cookieArr = request.getCookies();
if (cookieArr != null && cookieArr.length > 0) {
for (Cookie cookie : cookieArr) {
if (cookie.getName().equals(cookieName)) {
try {
return URLDecoder.decode(cookie.getValue(), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}
}
return null;
} }