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//读取cookie数组，之后迭代出各个cookie
    public void showCookies(HttpServletRequest request){
        Cookie[] cookies = request.getCookies();//根据请求数据，找到cookie数组
        if (null==cookies) {//如果没有cookie数组
            System.out.println("没有cookie");
        } else {
            for(Cookie cookie : cookies){
                System.out.println("cookieName:"+cookie.getName()+",cookieValue:"+ cookie.getValue());
            }
        }
    }
    //创建cookie，并将新cookie添加到“响应对象”response中。
    public void addCookie(HttpServletResponse response){
        Cookie cookie = new Cookie("name_test","value_test");//创建新cookie
        cookie.setMaxAge(5 * 60);// 设置存在时间为5分钟
        cookie.setPath("/");//设置作用域
        response.addCookie(cookie);//将cookie添加到response的cookie数组中返回给客户端
    }
    //修改cookie，可以根据某个cookie的name修改它（不只是name要与被修改cookie一致，path、domain必须也要与被修改cookie一致）
    public void editCookie(HttpServletRequest request,HttpServletResponse response){
        Cookie[] cookies = request.getCookies();
        if (null==cookies) {
            System.out.println("没有cookies");
        } else {
            for(Cookie cookie : cookies){
                //迭代时如果发现与指定cookieName相同的cookie，就修改相关数据
                if(cookie.getName().equals("name_test")){
                    cookie.setValue("new_value");//修改value
                    cookie.setPath("/");
                    cookie.setMaxAge(10 * 60);// 修改存活时间
                    response.addCookie(cookie);//将修改过的cookie存入response，替换掉旧的同名cookie
                    break;
                }
            }
        }
    }
    //删除cookie
    public void delCookie(HttpServletRequest request,HttpServletResponse response){
        Cookie[] cookies = request.getCookies();
        if (null==cookies) {
            System.out.println("没有cookie");
        } else {
            for(Cookie cookie : cookies){
                //如果找到同名cookie，就将value设置为null，将存活时间设置为0，再替换掉原cookie，这样就相当于删除了。
                if(cookie.getName().equals("name_test")){
                    cookie.setValue(null);
                    cookie.setMaxAge(0);
                    cookie.setPath("/");
                    response.addCookie(cookie);
                    break;
                }
            }
        }
    }