R add isError and isSuccess method

RuoYi

2022-09-12 f5bec709111dcf7a2d9900b19e8b8c5b1162c55c

 ruoyi-common/src/main/java/com/ruoyi/common/utils/ExceptionUtil.java

@@ -18,8 +18,7 @@
    {

        StringWriter sw = new StringWriter();

        e.printStackTrace(new PrintWriter(sw, true));

        String str = sw.toString();

        return str;

        return sw.toString();

    }



    public static String getRootErrorMessage(Exception e)