在项目开发中,记录错误日志方便调试、便于发现系统运行过程中的错误、便于后期分析,

在java中,记录日志有很多种方式,比如说log4j

log4j需要导入的包:

commons-loggin.jar

log4j.jar

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" alt="" />

修改配置文件

在log4j.properties写入

### 设置级别和目的地(这里多个目的地) ###
log4j.rootLogger = DEBUG,CONSOLE,zhangsanLog
### 这里的me是包,也就是在这个包记录日志时,是只记录debug及以上级别的日志
log4j.logger.me=DEBUG
### 输出到控制台 ###
log4j.appender.CONSOLE = org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Target = System.out
log4j.appender.CONSOLE.layout = org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n ### 输出到日志文件 ###
log4j.appender.zhangsanLog = org.apache.log4j.DailyRollingFileAppender
log4j.appender.zhangsanLog.File =G\:\\untitled\\debug.log
#log4j.appender.zhangsanLog.File =/var/alldata/zhenduan/debug.log
log4j.appender.zhangsanLog.Append = true
## 只输出DEBUG级别以上的日志
log4j.appender.zhangsanLog.Threshold = DEBUG
public class Test {
public static Logger logger = Logger.getLogger(Test.class); public static void main(String[] args) {
logger.trace("trace");
logger.debug("debug");
logger.info("info");
logger.warn("warn");
logger.error("error");
logger.fatal("fatal");
}
}

可以把日志输出到指定磁盘文件

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