Log4jUtils.java 文件源码

public static void init(List<String> locationPatterns) throws Exception {
  if (inited) {
    return;
  }

  synchronized (LOCK) {
    if (inited) {
      return;
    }

    PropertiesLoader loader = new PropertiesLoader(locationPatterns);
    Properties properties = loader.load();
    if (properties.isEmpty()) {
      throw new Exception("can not find resource " + locationPatterns);
    }

    PropertyConfigurator.configure(properties);
    inited = true;

    // 如果最高优先级的文件是在磁盘上，且有写权限，则将merge的结果输出到该目录，方便维护时观察生效的参数
    outputFile(loader.getFoundResList(), properties);
  }
}