标签：tin tcl strong his 影响 arch priority creating rac
log4j.rootLogger=INFO, CONSOLE
Logger.getRootLogger().setLevel(org.apache.log4j.Level.DEBUG)
log4j.appender.CONSOLE.Threshold=DEBUG
((org.apache.log4j.ConsoleAppender)Logger.getRootLogger().getAppender("CONSOLE")).setThreshold(Priority.DEBUG)
注意Appender的转型,用AppenderSkeleton 更好
log4j.logger.org.simonme.log4j.thread=ERROR
Logger.getRootLogger().getLogger("org.simonme.log4j.thread").setLevel(org.apache.log4j.Level.DEBUG);
另：
Logger.getRootLogger().getCurrentCategories(); 能拿到所有logger对象
只是已经是过时api了
再另：
级别无论如何设置，不会超过其父级别
上面 1 2 3 就是按父子顺序的排列的。
再另另：
针对包名的日志级别配置 log4j.logger.org.simonme.log4j.thread=ERROR 是在什么地方处理了这个逻辑 使之生效的
请查看org.apache.log4j.Hierarchy.updateParents(Logger)方法
//System.out.println("UpdateParents called for " + name); // if name = "w.x.y.z", loop thourgh "w.x.y", "w.x" and "w", but not "w.x.y.z" for(int i = name.lastIndexOf(‘.‘, length-1); i >= 0; i = name.lastIndexOf(‘.‘, i-1)) { String substr = name.substring(0, i); //System.out.println("Updating parent : " + substr); CategoryKey key = new CategoryKey(substr); // simple constructor Object o = ht.get(key); // Create a provision node for a future parent. if(o == null) { //System.out.println("No parent "+substr+" found. Creating ProvisionNode."); ProvisionNode pn = new ProvisionNode(cat); ht.put(key, pn); } else if(o instanceof Category) { parentFound = true; cat.parent = (Category) o; //System.out.println("Linking " + cat.name + " -> " + ((Category) o).name); break; // no need to update the ancestors of the closest ancestor } else if(o instanceof ProvisionNode) { ((ProvisionNode) o).addElement(cat); } else { Exception e = new IllegalStateException("unexpected object type " + o.getClass() + " in ht."); e.printStackTrace(); } }
再另另另：
性能如何
org.apache.log4j.Category.getEffectiveLevel()
for(Category c = this; c != null; c=c.parent) { if(c.level != null) return c.level; }
是向父级别查找的办法，所以性能无大影响。
标签：tin tcl strong his 影响 arch priority creating rac
原文地址：http://www.cnblogs.com/simoncook/p/7138052.html
