发布于 2016-05-30 00:25:34 | 203 次阅读 | 评论: 0 | 来源: 网友投递
Apache Log4j log记录软件
Log4j是Apache的一个开放源代码项目，通过使用Log4j，我们可以控制日志信息输送的目的地是控制台、文件、GUI组件，甚至是套接口服务器、NT的事件记录器、UNIX Syslog守护进程等；我们也可以控制每一条日志的输出格式；通过定义每一条日志信息的级别，我们能够更加细致地控制日志的生成过程。最令人感兴趣的就是，这些可以通过一个配置文件来灵活地进行配置，而不需要修改应用的代码。
Log4j 2.6 发布了，本次发布的一些新特性：
o LOG4J2-1270: (GC) Added support for garbage-free logging in steady state.
This includes Async Loggers and logging synchronously to the console and to a file,
but does not include the AsyncAppender. This release makes the GelfLayout and
the main patterns in the PatternLayout garbage-free.
o LOG4J2-1297: (GC) Added manual page on garbage-free logging.
o LOG4J2-1373: (GC) Update Logger wrapper Generator tool to generate methods for the new
Logger methods.
o LOG4J2-1326: (GC) Added methods to the Logger interface for logging CharSequence messages.
o LOG4J2-1344: (GC) FileAppender, RollingFileAppender and MemoryMappedFileAppender are now
also garbage-free by default.
o LOG4J2-1278: (GC) Added unrolled varargs methods to Logger API, added Unbox utility to
avoid auto-boxing when logging primitive values.
o LOG4J2-1271: (GC) Add MessageFactory that avoid allocation by reusing a cached ParameterizedMessage
instance.
o LOG4J2-1293: (GC) Add interface StringBuilderFormattable to enable converting Messages
and parameters to text without allocating temporary objects.
ParameterizedMessage, ObjectMessage, SimpleMessage and ThreadDumpMessage now implement
StringBuilderFormattable.
o LOG4J2-1274: (GC) Add encode(LogEvent, ByteBufferDestination) method to Layout API to enable
converting LogEvents to bytes without creating temporary objects.
o LOG4J2-1362: Added a YAML layout. Thanks to Gary Gregory.
o LOG4J2-1179: Documented benchmark results comparing Log4j 2 performance to other logging
libraries.
o LOG4J2-1011: Document dependencies for layouts.
o LOG4J2-621: Pattern to drop first N package parts. Thanks to Lee Theobald, Kamal Mettananda,
Gary Gregory.
o LOG4J2-494: Support merging configurations to for a composite configuration. Thanks to
Philipp Knobel.
o LOG4J2-1357: Option to not log stack traces for logged Throwables in GelfLayout.
o LOG4J2-1348: Add an AutoCloseable ThreadContext class: CloseableThreadContext. Thanks to
Greg Thomas, Gary Gregory.
o LOG4J2-1299: Add pattern converter for thread id and priority in PatternLayout.
o LOG4J2-124: Add shutdown methods to LogManager.
o LOG4J2-1221: Added async logger Timeout wait strategy and made this the default wait strategy
for async loggers.
This prevents a rare deadlock that may occur on Solaris. Thanks to Michael Barker.
o LOG4J2-1080: Added option to discard events below a certain log level if the async logger
ring buffer
or async appender queue is full.
o LOG4J2-1237: Make PatternLayout header and footer accept a pattern. Thanks to Mike Calmus,
Gary Gregory.
o LOG4J2-1244: Make header and footer values customizable in JSONLayout. Thanks to Anshu
Garg, Remko Popma, Gary Gregory.
o LOG4J2-1245: Make CSV Layout header and footers accept patterns.
o LOG4J2-1192: Dynamic Subject for SMTP Appender. Thanks to Jörg Bretschneider, Gary Gregory.
o LOG4J2-1277: FormattedMessage, MessageFormatMessage and StringFormattedMessage should support
passing in a Locale to ensure appropriate formatting. Thanks to Gary Gregory, Ludovic Hochet.
o LOG4J2-1303: Add documentation links to runtime dependencies in each component intro page.
o LOG4J2-1252: JeroMqAppender should support layouts.
o LOG4J2-1217: PatternLayout option to limit length of text. Thanks to Thies Wellpott.
o LOG4J2-1133: Add JNDI lookup documentation.
o LOG4J2-1169: PatternLayout: Possible variable substitution in equals substitution parameter.
Thanks to Gerald Kritzinger.
完整改进记录，可以在这里查看。