maven项目打印log

maven项目打印log

1.在maven的配置文件pom.xml文件进入log4j的jar包

</dependency>         <dependency>     <groupId>log4j</groupId>     <artifactId>log4j</artifactId>     <version>1.2.17</version> </dependency>

2.在maven项目的src/test/java目录下新建log4j.properties文件，内容如下：

### \u8BBE\u7F6E### log4j.rootLogger = debug,stdout,D,E ### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ### log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n ### \u8F93\u51FADEBUG \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ### log4j.appender.D = org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File = E://logs/log.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG  log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n ### \u8F93\u51FAERROR \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=E://logs/error.log ### log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log  log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR  log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

3.在maven项目的src/test/java目录中的xxxTest.java类中输出log日志：内容如下

  @Test   public void f() {  System.out.println("天气不错test");  // 记录debug级别的信息            logger.debug("This is debug message.");            // 记录error级别的信息            logger.error("This is error message.");       } 

4.执行maven项目测试类结束后查看log文件的目录log4j.appender.E.File =E://logs/error.log ，并打开log查看日志详情

log结果：2017-04-04 17:15:24  [ pool-1-thread-1:1 ] - [ ERROR ]  This is error message.