解决重载logf4j2配置文件问题

1 问题：重载logf4j2配置文件

 

2 解决方案

2.1 官方文档：How do I reconfigure log4j2 in code with a specific configuration file?

https://logging.apache.org/log4j/2.x/faq.html#config_from_code

// import org.apache.logging.log4j.core.LoggerContext;
可以配置本地文件
LoggerContext context = (org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false);
File file = new File("path/to/a/different/log4j2.xml");

// this will force a reconfiguration
context.setConfigLocation(file.toURI());

 

2.2 使用ConfigurationFactory 创建

//ConfigurationFactory的实现类 ：XmlConfigurationFactory，YamlConfigurationFactory，
InputStream = null；
in = new FileInputStream(new File("path/to/a/different/log4j2.xml"));
ConfigurationSource source = new ConfigurationSource(inputStream);
Configuration configuration = new XmlConfigurationFactory().getConfiguration(context, source);
context.setConfiguration(configuration);

2.3 使用Nacos解决

    @NacosConfigListener(dataId = "log4j2.yml")
    public void onMessage(String config) throws UnsupportedEncodingException {
        System.out.println(config);

        LoggerContext context = (org.apache.logging.log4j.core.LoggerContext) LogManager.getContext(false);

        InputStream inputStream = new ByteArrayInputStream(config.getBytes("UTF-8"));

        try {
            ConfigurationSource source = new ConfigurationSource(inputStream);
            Configuration configuration = new YamlConfigurationFactory().getConfiguration(context, source);
            context.setConfiguration(configuration);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }