cookie包含中文导致的问题

周五项目测试完毕没问题之后上线，上线之后发现有的账户登录不上

原因为，用来记录追踪用户的cookie中包含cookie。读取，写入时候发生异常。

异常大概是这个样子：

java.lang.IllegalArgumentException: Control character in cookie value or attribute.
        at org.apache.tomcat.util.http.CookieSupport.isHttpSeparator(CookieSupport.java:193)
        at org.apache.tomcat.util.http.CookieSupport.isHttpToken(CookieSupport.java:217)
        at org.apache.tomcat.util.http.ServerCookie.appendCookieValue(ServerCookie.java:186)
        at org.apache.catalina.connector..Response.generateCookieString(Response.java:1032)
        at org.apache.catalina.connector..Response.addCookie(Response.java:974)
        at org.apache.catalina.connector..ResponseFacade.addCookie(ResponseFacade.java:381)
        at com.vcfilm.interceptor.service.AutologonService.setCookie(AutologonService.java:168)
        at com.vcfilm.interceptor.service.AutologonService.saveLogonInfo(AutologonService.java:129)
        at com.vcfilm.interceptor.service.AutologonService.saveLogonInfo(AutologonService.java:139)
        at com.vcfilm.wechat.actioncommon.BaseAction.SaveSession(BaseAction.java:45)
        at com.vcfilm.wechat.actioncommon.BaseAction.SetMember(BaseAction.java:191)
        at com.vcfilm.wechat.member.MemberAction.logincheck(MemberAction.java:364)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)

中文需要 URLEncoder.encode.  utf-8 

可参这篇文章 http://blog.csdn.net/newyear1988/article/details/7817066

加了之后发现还是有问题，写cookie的时候用des加密了，发现取cookie，getVal()之后用解密的时候异常，于是在捕获异常代码块直接返回了getVal()得到的值。

    /**
     * 从cookie中取值
     * */
    public String getCookieVal(HttpServletRequest request, String key){
        Cookie[] cookies= request.getCookies();
        if(null != cookies && cookies.length > 0){
            for(Cookie c:cookies){
                if(c.getName().equalsIgnoreCase(key)){
                    if(null != c){
                        try{
                            return URLDecoder.decode(c.getValue(), "utf-8");
                        }catch(Exception e){
                            e.printStackTrace();
                            return c.getValue();
                        }
                    }
                }
            }
        }
        return "";
    }
    
    /**
     * 保存值到cookie
     * */
    public void setCookie(String key, String val, int maxAge){
        try{
            val = URLEncoder.encode(val, "utf-8");
        }catch(Exception e){
            e.printStackTrace();
        }
        Cookie cookie = new Cookie(key, val);
        if(maxAge > 0){
            cookie.setMaxAge(maxAge);
        }
        cookie.setPath("/");
        ServletActionContext.getResponse().addCookie(cookie);
    }