/**

     * 把异常的栈轨迹以String形式返回,而不是直接打印到console

     * @author King

     * @time 2015-04-29

     * @return

     */

    public static String getLongInfo(Throwable e){

        StringWriter sw = new StringWriter();

        PrintWriter pw = new PrintWriter(sw, true);

        e.printStackTrace(pw);

        pw.flush();

        sw.flush();

        return sw.toString();

    }