java 堆栈信息
场景：java log 错误 堆栈信息打印
java log 异常 堆栈信息打印
java log 异常 堆栈信息打印
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
logger.error("downalod exception:"+e.getMessage()+"\t"+errors.toString());