logback 和 MDC

如何解决logback 和 MDC

有没有办法将来自 MDC 的属性记录为整数？我的 logback.xml 中有这种模式，

<pattern>
    {
    "level": "%level","maz": {
    "tenant": "%mdc{tenant}","login": "%mdc{login}","process": "backend"
    },"http": {
    "host": "%mdc{host}","provider": "%mdc{provider}","method": "%mdc{method}","request": "%mdc{request}","query": "%mdc{query}","size_o": "%mdc{size}","status": "%mdc{status}","duration_ms": "%mdc{duration}"
    },"message": "%message"
    }
</pattern>

并且我想将持续时间打印为整数而不是字符串，如果没有，有没有办法在 logback.xml 中读取 java 变量？或者是否有任何建议将此变量记录为整数？

解决方法

mdc 可以使用带有符号的默认值：- .default 值支持表达式，如 %mdc{duration:-${defaultCostTime}}

<property name="defaultCostTime" value="1"/>

<pattern>
    {
    "level": "%level","maz": {
    "tenant": "%mdc{tenant}","login": "%mdc{login}","process": "backend"
    },"http": {
    "host": "%mdc{host}","provider": "%mdc{provider}","method": "%mdc{method}","request": "%mdc{request}","query": "%mdc{query}","size_o": "%mdc{size}","status": "%mdc{status}","duration_ms": %mdc{duration:-${defaultCostTime}}
    },"message": "%message"
    }
</pattern>