java js 读写cookie

java和javaScript设置cookie的有效期不同，java是设置有效时间的秒数，而javaScript设置的是有效日期的字符串。

设置cookie时要注意cookie的路径问题，在页面读取cookie时，只能够读取到页面本级目录的cookie和上级目录的cookie，其他都不会读取到。

java 读写删cookie

 

/**
  * 获取cookie值
  *
  * @param cookieName
  * @param request
  * @param response
  * @return
  */
 public static String getCookieValue(String cookieName) {
  if (cookieName == null || cookieName.equals("")) {
   return "";
  }
  HttpServletRequest request = ServletActionContext.getRequest();
  Cookie[] cookies = request.getCookies();
  int length = 0;

  if (cookies != null && cookies.length > 0) {
   length = cookies.length;
   for (int i = 0; i < length; i++) {
    String cname = cookies[i].getName();
    if (cname != null && cname.equals(cookieName)) {
     String cValue = cookies[i].getValue();
     return cValue;
    } else {
     continue;
    }
   }
   return "";
  } else {
   return "";
  }
 }

 /**
  * 写入cookie 值
  *
  * @param cookieName
  *            cookie名称
  * @param value
  *            cookie值
  * @param expireHours
  *            cookie有效小时数
  * @return
  */
 public static void setCookie(String cookieName, String value,
   int expireHours) {
  HttpServletResponse response = ServletActionContext.getResponse();
  Cookie cookie = new Cookie(cookieName, value);
  cookie.setPath("/");// 这个要设置
  cookie.setDomain(".bessystem.com");// 这样设置，能实现两个网站共用
  if (expireHours != 0) {
   expireHours = expireHours * 60 * 60; // 不设置的话，则cookies不写入硬盘,而是写在内存,只在当前页面有用,以秒为单位
  }
  cookie.setMaxAge(expireHours);
  response.addCookie(cookie);
 }

 /**
  * 删除cookie
  *
  * @param cookieName
  */
 public static void deleteCookie(String cookieName) {
  if (cookieName == null || cookieName.equals("")) {
   return ;
  }
  HttpServletRequest request = ServletActionContext.getRequest();
  Cookie[] cookies = request.getCookies();
  int length = 0;

  if (cookies != null && cookies.length > 0) {
   length = cookies.length;
   for (int i = 0; i < length; i++) {
    String cname = cookies[i].getName();
    if (cname != null && cname.equals(cookieName)) {
     String cValue = cookies[i].getValue();
     setCookie(cname,cValue,0);
    } else {
     continue;
    }
   }
  }
 }

 

 

 

  javascript 读取cookie值
    function getCookieVal(cookieName)
   {
        var  search  =  cookieName  +  "="
        var  returnvalue  =  "";
        if  (document.cookie.length  >  0)
         {
            offset  =  document.cookie.indexOf(search);
            if  (offset  !=  -1) 
            {
                offset  +=  search.length
                end  =  document.cookie.indexOf(";",  offset);
                if  (end  ==  -1)
                    end  =  document.cookie.length;
                returnvalue=unescape(document.cookie.substring(offset,  end))
            }
        }
        return  returnvalue;
    }

javascript写入cookie

    function setCookie( name, value, expires, path, domain, secure ) {
   
        var today = new Date();
        today.setTime( today.getTime() );
   
        if ( expires )
        {
            expires = expires * 1000 * 60 * 60 * 24;
        }
   
        var expires_date = new Date( today.getTime() + (expires) );

        document.cookie = name + "=" +escape( value ) +
            ( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) + //expires.toGMTString()
            ( ( path ) ? ";path=" + path : "" ) +
            ( ( domain ) ? ";domain=" + domain : "" ) +
            ( ( secure ) ? ";secure" : "" );
    }