java.lang.IllegalArgumentException：cookie 值或属性中的控制字符

我试图在cookie中设置unicode值，但它不接受这一点并抛出异常。我已经检查了字符串的十六进制值，它是正确的，但在添加到cookie时会引发异常。

private void fnSetCookieValues(HttpServletRequest request,HttpServletResponse response) 
    {

        Cookie[] cookies=request.getCookies();
        for (int i = 0; i < cookies.length; i++) {

            System.out.println(""+cookies.length+"Name"+cookies[i].getName());

            if(cookies[i].getName().equals("DNString"))
            {   
                System.out.println("Inside if:: "+cookies[i].getValue()+""+cookies.length);
                try {

                    String strValue;
                    strValue = new String(request.getParameter("txtIIDN").getBytes("8859_1"),"UTF8");
                    System.out.println("Cookie Value To be stored"+strValue);
                    for (int j = 0; j < strValue.length(); j++) {

                        System.out.println("Code Point"+Integer.toHexString(strValue.codePointAt(j)));

                    }


                    Cookie ck = new Cookie("DNString",strValue);
                    response.addCookie(ck);

                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


            }
        }

    }

我得到：

java.lang.IllegalArgumentException: Control character in cookie value or attribute.

将 Cookie 添加到响应对象时。我使用Tomcat 7和Java 7作为运行时环境。