?log4j日志

?https://blog.csdn.net/sunny_na/article/details/55212029

更详细的log4j配置：https://www.cnblogs.com/aaron-shu/p/7812757.html

 ### 设置###
log4j.rootLogger = debug,stdout,D,E

### 输出信息到控制抬 ###
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

### 输出DEBUG 级别以上的日志到=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

### 输出ERROR 级别以上的日志到=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

import org.apache.log4j.Logger;
/**
 *@author 0
 */
public class Test {
	private static Logger logger = Logger.getLogger(Test.class);  
 
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        // System.out.println("This is println message.");  
 
        // 记录debug级别的信息  
        logger.debug("This is debug message.");  
        // 记录info级别的信息  
        logger.info("This is info message.");  
        // 记录error级别的信息  
        logger.error("This is error message.");  
    }  
 
}