Lombok 之 Log

这是本系列最后一个annotation了，也是Lombok里面最好用的一个了，我们每天写项目都会有很多日志需要记录，很多人都写过这样的代码：

 private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LogExample.class);

 

Lombok的方便不是说说而已的，哪里有重复，哪里就有Lombok（YY的 :) ），Lombok封装了许多主流的Log库，提供了一系列关于Log 的annotation。下面就是所有的annotation会代表哪些特定的类 :

 

 @CommonsLog
 Creates private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog(LogExample.class);
 @Log
 Creates private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(LogExample.class.getName());
 @Log4j
 Creates private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(LogExample.class);
 @Log4j2
 Creates private static final org.apache.logging.log4j.Logger log = org.apache.logging.log4j.LogManager.getLogger(LogExample.class);
 @Slf4j
 Creates private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(LogExample.class);
 @XSlf4j
 Creates private static final org.slf4j.ext.XLogger log = org.slf4j.ext.XLoggerFactory.getXLogger(LogExample.class);

 

就用其中的几个举个例子吧：

 import lombok.extern.java.Log;
 import lombok.extern.slf4j.Slf4j;

 @Log
 public class LogExample {

   public static void main(String... args) {
     log.error("Something's wrong here");
   }
 }

 @Slf4j
 public class LogExampleOther {

   public static void main(String... args) {
     log.error("Something else is wrong here");
   }
 }

 @CommonsLog(topic="CounterLog")
 public class LogExampleCategory {

   public static void main(String... args) {
     log.error("Calling the 'CounterLog' with a message");
   }
 }

 

翻译一下，代码如下：

 public class LogExample {
   private static final java.util.logging.Logger log = java.util.logging.Logger.getLogger(LogExample.class.getName());

   public static void main(String... args) {
     log.error("Something's wrong here");
   }
 }

 public class LogExampleOther {
   private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(LogExampleOther.class);

   public static void main(String... args) {
     log.error("Something else is wrong here");
   }
 }

 public class LogExampleCategory {
   private static final org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory.getLog("CounterLog");

   public static void main(String... args) {
     log.error("Calling the 'CounterLog' with a message");
   }
 }

 

想必不用多说了，例子一看就懂了，唠叨一句就是annotation提供一个topic选项，可以定制化getLog方法的参数。 为什么没提供backlog呢？ 一直用backlog啊

转载自： http://zhuqiuxu.iteye.com/blog/2124589