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;
    }
   }
  }
}

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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" : "" );
    }

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