JavaEE SSH框架整合(四) 日志处理Spring结合 log4j、slf4j [转]

1. 加入log4j和slf4j的jar包

2. web.xml：  

<context-param>
    <!--log4j配置地址 -->
    <param-name>log4jConfigLocation</param-name>
    <!-- <param-value>/WEB-INF/classes/log4j.properties</param-value> -->
    <param-value>classpath:log4j.properties</param-value>
</context-param>
<context-param>
    <!-- log4j 配置扫描刷新间隔 可以不用 -->
    <param-name>log4jRefreshInterval</param-name>
    <param-value>10000</param-value>
</context-param>
<!-- spring里的log4j配置监听器 -->
<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

3. src/log4j.properties：

### set log levels ###
log4j.rootLogger = debug,stdout,D,E

### 输出到控制台 ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.Threshold = INFO
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =  %d{ABSOLUTE} %5p %c{1}:%L - %m%n
log4j.appender.stdout.Encoding=UTF-8

### 输出到日志文件 ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = ${ssh}WEB-INF/logs/debug.log
log4j.appender.D.file.MaxFileSize=500KB
log4j.appender.D.Append = true
    ##输出DEBUG级别以上的日志
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
log4j.appender.D.Encoding=UTF-8

### 保存异常信息到单独文件 ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
    ## 异常日志文件名
log4j.appender.E.File = ${ssh}WEB-INF/logs/error.log
log4j.appender.E.file.MaxFileSize=500KB
log4j.appender.E.Append = true
    ## 只输出ERROR级别以上的日志!!!
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
log4j.appender.E.Encoding=UTF-8

  配置info级输出到控制台，debug和error 都输出到对应文件中。

4. 使用log对象

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.stone.action.DefaultAction;

public class LogUtil {
    //使用slf4j创建日志对象，好处时，以后更换为其它日志工具时，只要修改配置文件，不用修改代码
    private static Logger logger = LoggerFactory.getLogger(LogUtil.class);
    //使用log4j创建日志对象
//  private org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger(getClass());

    public static void error(String message) {
        logger.error(message);
    }
    public static void debug(String message) {
        logger.debug(message);
    }
    public static void info(String message) {
        logger.info(message);
//      org.apache.log4j.Logger.getLogger(LogUtil.class).info(message);
    }
}