Java 7 introduced the Method Handles with the java.lang.invoke.MethodHandle and java.lang.invoke.MethodHandles classes. The Well-Grounded Java Developer (which I have previously reviewed) covers ...

This logger is based on JUL to allow fast JSON traces to be written to disk. It is not lockless or nanosecond precise, but is fast and simple to use and configure. A Snapshot taker is provided in ...

大致流程：应用app =》日志记录器Logger =》日志处理器Handler =》完成日志输出。其中，Logger与Handler过程中，还穿插着日志过滤器Filter =》日志格式化组件Formatter =》日志输出级别Level等组件。 在resources下创建log4j.xml或者log4j.properties，如果都存在，则以xml为准。