如何在logback.xml中动态指定文件路径

问题描述

我是Logback的新手，我试图为Windows和Linux动态添加带有属性文件的文件路径.

I am new to Logback, I am trying to add file path dynamically, with a property file, for both windows and Linux.

这是我拥有的代码sinppet，如何将值获取到$ {MY_HOME}

Here is the code sinppet I have, how can I get the value to ${MY_HOME}

<appender name="SERVER_FILE" class="ch.qos.logback.core.FileAppender">
    <file>${MY_HOME}/server.log</file>
    <append>true</append>
    <encoder>
      <pattern>%d [%thread] %-5level %logger{35} - %msg%n</pattern>
    </encoder>
  </appender>

推荐答案

通常，这是系统属性，有一些与此相关的答案，但仅提供了一部分答案.这些是:

Typically this is a system property, there are some answers that touch on this but only provide one part of the answer. These are:

• Logback.xml配置
• logback如何设置目标文件夹日志文件

• Logback.xml configuration
• logback how to set destination folder for log files

但是配置上的手册显示该机制非常灵活

But the manual on configuration shows that the mechanism is quite flexible

总而言之，您可以使用许多选项来定义MY_HOME的值:

In summary you have a number of options for defining the value of MY_HOME:

在文件中

您可以使用以下命令在文件本身中定义值:

You are able to define the value in the file itself with:

<property name="MY_HOME" value="/home/myhome"/>

在系统属性中

您可以安排将其设置为系统属性，最有可能在启动JVM时使用.

You can arrange for it to be set as a system property, most likely when you start the JVM.

java -DMY_HOME="/home/myhome" ...

从系统上的属性文件中

您可以安排登录以读取属性文件:

You can arrange for logback to read a property file:

<property file="/opt/example/instance_1/properties/system.properties" />

从类路径

您可以使用类路径将属性文件写入资源目录或jar中，并将其作为资源读出.

You can write a properties file into a resources directory or into a jar and read it out as a resource, using the classpath.

<property resource="prod.properties" />

使用属性定义器

您可以使用属性定义器来安排调用您的代码.例如:

You can arrange to call into your code, by using a property definer. For example:

<define name="MY_HOME" class="biz.nowhere.HomePropertyDefiner">
   <application>app</application>
</define>

该类类似(例如)的地方:

Where that class is something like (as an example):

public class HomePropertyDefiner extends PropertyDefinerBase {

  private String application;

  @Override
  public String getPropertyValue() {
    return String.format("/opt/%s/%s", application, MyInstanceManager.instancePath());
  }

  public void setApplication(String application) {
      this.application = application;
  }

}

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