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<Root level="INFO"> <!-- 开发环境使用Console Appender，生产环境使用File Appender --> <springProfile name="dev"> <AppenderRef ref="Console"/> </springProfile> <SpringProfile name="!dev"> <AppenderRef ref="File"/> </SpringProfile></Root>

private void constructHierarchy(final Node node, final Element element) { processAttributes(node, element); final StringBuilder buffer = new StringBuilder(); final NodeList list = element.getChildNodes(); final List<Node> children = node.getChildren(); for (int i = 0; i < list.getLength(); i++) { final org.w3c.dom.Node w3cNode = list.item(i); if (w3cNode instanceof Element) { final Element child = (Element) w3cNode; final String name = getType(child); final PluginType<?> type = pluginManager.getPluginType(name); final Node childNode = new Node(node, name, type); constructHierarchy(childNode, child); if (type == null) { final String value = childNode.getValue(); if (!childNode.hasChildren() && value != null) { node.getAttributes().put(name, value); } else { status.add(new Status(name, element, ErrorType.CLASS_NOT_FOUND)); } } else { children.add(childNode); } } else if (w3cNode instanceof Text) { final Text data = (Text) w3cNode; buffer.append(data.getData()); } }
 final String text = buffer.toString().trim(); if (text.length() > 0 || (!node.hasChildren() && !node.isRoot())) { node.setValue(text); } }

private Element rootElement;

class SpringBootJoranConfigurator extends JoranConfigurator {
 private LoggingInitializationContext initializationContext;
 SpringBootJoranConfigurator(LoggingInitializationContext initializationContext) { this.initializationContext = initializationContext; }
 @Override public void addInstanceRules(RuleStore rs) { super.addInstanceRules(rs); Environment environment = this.initializationContext.getEnvironment(); rs.addRule(new ElementSelector("configuration/springProperty"), new SpringPropertyAction(environment)); rs.addRule(new ElementSelector("*/springProfile"), new SpringProfileAction(environment)); rs.addRule(new ElementSelector("*/springProfile/*"), new NOPAction()); }}

@Overridepublic void addInstanceRules(RuleStore rs) { super.addInstanceRules(rs); Environment environment = this.initializationContext.getEnvironment(); rs.addRule(new ElementSelector("configuration/springProperty"), new SpringPropertyAction(environment)); //就是这么简单…… rs.addRule(new ElementSelector("*/springProfile"), new SpringProfileAction(environment)); rs.addRule(new ElementSelector("*/springProfile/*"), new NOPAction());}

private final LoggingInitializationContext initializationContext;
private final Environment environment;

public SpringBootXmlConfiguration(final LoggingInitializationContext initializationContext, final LoggerContext loggerContext, final ConfigurationSource configSource) { super(loggerContext, configSource); this.initializationContext = initializationContext; this.environment = initializationContext.getEnvironment(); ...}

private void constructHierarchy(final Node node, final Element element, boolean profileNode) { //SpringProfile节点不需要处理属性 if (!profileNode) { processAttributes(node, element); } final StringBuilder buffer = new StringBuilder(); final NodeList list = element.getChildNodes(); final List<Node> children = node.getChildren(); for (int i = 0; i < list.getLength(); i++) { final org.w3c.dom.Node w3cNode = list.item(i); if (w3cNode instanceof Element) { final Element child = (Element) w3cNode;
 final String name = getType(child); //如果是<SpringProfile>标签，就跳过plugin的查找和解析 // Enhance log4j2.xml configuration if (SPRING_PROFILE_TAG_NAME.equalsIgnoreCase(name)) { //如果定义的Profile匹配当前激活的Profiles，就递归解析子节点，否则就跳过当前节点（和子节点） if (acceptsProfiles(child.getAttribute("name"))) { constructHierarchy(node, child, true); } // Break <SpringProfile> node continue; } //查找节点对应插件，解析节点，添加到node，构建rootElement树 //...... }}//判断profile是否符合规则，从Spring Boot - Logback里复制的……private boolean acceptsProfiles(String profile) { if (this.environment == null) { return false; } String[] profileNames = StringUtils.trimArrayElements(StringUtils.commaDelimitedListToStringArray(profile)); if (profileNames.length == 0) { return false; } return this.environment.acceptsProfiles(Profiles.of(profileNames));}

//org.springframework.boot.logging.log4j2.Log4J2LoggingSystem......LoggerContext ctx = getLoggerContext();URL url = ResourceUtils.getURL(location);ConfigurationSource source = getConfigurationSource(url);Configuration configuration;if (url.toString().endsWith("xml") && initializationContext != null) { //XML文件并且initializationContext不为空时，就使用增强的SpringBootXmlConfiguration进行解析 configuration = new SpringBootXmlConfiguration(initializationContext, ctx, source);}else { configuration = ConfigurationFactory.getInstance().getConfiguration(ctx, source);}......

void profileActive();void multipleNamesFirstProfileActive();void multipleNamesSecondProfileActive();void profileNotActive();void profileExpressionMatchFirst();void profileExpressionMatchSecond();void profileExpressionNoMatch();void profileNestedActiveActive();void profileNestedActiveNotActive();......