Question

这是来自Log4J2's site的XML配置示例：

我尝试了一些不同的JSON版本，所有这些版本都因NullPointException或类似内容而失败。

例如，以下配置失败：

      "PatternLayout": {
        "MarkerPatternSelector": {
          "defaultPattern": [%-5level] %c{1.} %msg%n",
          "PatternMatch": {
            "key": "FLOW",
            "pattern": "[%-5level] %c{1.} ====== %C{1.}.%M:%L %msg ======%n"
          }
        }
      }

此XML配置的正确JSON等效项是什么？

Answer 1

问题是由于我正在使用的Log4J2版本（2.3）。 2.6.2支持此功能。更确切地说，这是2.6.2中的工厂方法：

@PluginFactory
public static PatternLayout createLayout(
        @PluginAttribute(value = "pattern", defaultString = DEFAULT_CONVERSION_PATTERN) final String pattern,
        @PluginElement("PatternSelector") final PatternSelector patternSelector,
        @PluginConfiguration final Configuration config,
        @PluginElement("Replace") final RegexReplacement replace,
        // LOG4J2-783 use platform default by default, so do not specify defaultString for charset
        @PluginAttribute(value = "charset") final Charset charset,
        @PluginAttribute(value = "alwaysWriteExceptions", defaultBoolean = true) final boolean alwaysWriteExceptions,
        @PluginAttribute(value = "noConsoleNoAnsi", defaultBoolean = false) final boolean noConsoleNoAnsi,
        @PluginAttribute("header") final String headerPattern,
        @PluginAttribute("footer") final String footerPattern) {
    return newBuilder()
        .withPattern(pattern)
        .withPatternSelector(patternSelector)
        .withConfiguration(config)
        .withRegexReplacement(replace)
        .withCharset(charset)
        .withAlwaysWriteExceptions(alwaysWriteExceptions)
        .withNoConsoleNoAnsi(noConsoleNoAnsi)
        .withHeader(headerPattern)
        .withFooter(footerPattern)
        .build();
}

以下是它在2.3中的样子：

@PluginFactory
public static PatternLayout createLayout(
        @PluginAttribute(value = "pattern", defaultString = DEFAULT_CONVERSION_PATTERN) final String pattern,
        @PluginConfiguration final Configuration config,
        @PluginElement("Replace") final RegexReplacement replace,
        @PluginAttribute(value = "charset", defaultString = "UTF-8") final Charset charset,
        @PluginAttribute(value = "alwaysWriteExceptions", defaultBoolean = true) final boolean alwaysWriteExceptions,
        @PluginAttribute(value = "noConsoleNoAnsi", defaultBoolean = false) final boolean noConsoleNoAnsi,
        @PluginAttribute("header") final String header,
        @PluginAttribute("footer") final String footer) {
    return newBuilder()
        .withPattern(pattern)
        .withConfiguration(config)
        .withRegexReplacement(replace)
        .withCharset(charset)
        .withAlwaysWriteExceptions(alwaysWriteExceptions)
        .withNoConsoleNoAnsi(noConsoleNoAnsi)
        .withHeader(header)
        .withFooter(footer)
        .build();
}

API文档网站的网址（https://logging.apache.org/log4j/2.x）让我觉得所有2.x版本都兼容。

与此Log4J2配置相当的JSON是什么？

1 个答案: