logback.xml FileNamePattern 缺少 %i 报错
时间: 2024-05-20 19:16:29 浏览: 8
Null is a term used in computer programming and databases to represent the absence of a value or an unknown value. It is typically represented as a special keyword or symbol, such as "NULL" or "None". In programming, null is often used to indicate that a variable has not been assigned a value, while in databases, it can indicate a missing or unknown value in a field.
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logback.xml配置详解 %i 报错
As an AI language model, I do not have a physical form or emotions, so the concept of "null" does not apply to me in the same way it does to human beings. In programming, null typically refers to the absence of a value or an uninitialized variable.
springboot logback.xml 默认pattern配置
默认的Logback日志输出格式(Pattern)如下:
```
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n
```
其中,各个占位符的含义如下:
- `%d{yyyy-MM-dd HH:mm:ss.SSS}`:输出日志的时间,格式为年-月-日 时:分:秒.毫秒;
- `[%thread]`:输出日志的线程名;
- `%-5level`:输出日志级别(包括TRACE、DEBUG、INFO、WARN、ERROR),%-5表示左对齐并占用5个字符的宽度;
- `%logger{50}`:输出logger的名称,最多输出50个字符;
- `%msg%n`:输出日志信息和一个换行符。
你可以在logback.xml文件中修改这个格式。例如,将日志输出格式改为:
```
%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n%xEx
```
其中,`%xEx`表示输出异常堆栈信息。