技術標籤：javalog4j

1 配置 log4j.properties配置檔案，路徑和配置如下：

### 設定###
log4j.rootLogger = debug,stdout,D,I,W,E

### 輸出資訊到控制抬 ###
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

### 輸出DEBUG 級別的日誌 ###
#log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D = com.jack.utils.MyAppender
log4j.appender.D.File = ./logs/debug.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.append=false
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

### 輸出WARN 級別的日誌 ###
#log4j.appender.I = org.apache.log4j.DailyRollingFileAppender
log4j.appender.I = com.jack.utils.MyAppender
log4j.appender.I.File =./logs/info.log
log4j.appender.I.Append = true
log4j.appender.I.Threshold = INFO
log4j.appender.I.append=false
log4j.appender.I.layout = org.apache.log4j.PatternLayout
log4j.appender.I.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 輸出WARN 級別的日誌 ###
#log4j.appender.W = org.apache.log4j.DailyRollingFileAppender
log4j.appender.W = com.jack.utils.MyAppender
log4j.appender.W.File =./logs/warn.log
log4j.appender.W.Append = true
log4j.appender.W.Threshold = WARN
log4j.appender.W.append=false
log4j.appender.W.layout = org.apache.log4j.PatternLayout
log4j.appender.W.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### 輸出ERROR 級別的日誌
#log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E = com.jack.utils.MyAppender
log4j.appender.E.File =./logs/error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.append=false
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
 

2 測試程式碼,如下：

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

public class App {

    private final static Logger logger = LoggerFactory.getLogger(App.class);

    public static void main(String[] args) {
        logger.debug("log debug ... ");
        logger.info("log info ... ");
        logger.warn("log warn ... ");
        logger.error("log error ... ");
    }

}
 

3 實際效果，如下：

4 關鍵配置

log4j.appender.D = com.jack.utils.MyAppender
log4j.appender.I = com.jack.utils.MyAppender
log4j.appender.W = com.jack.utils.MyAppender
log4j.appender.E = com.jack.utils.MyAppender

5 重寫了原生的 org.apache.log4j.DailyRollingFileAppender

重寫後的程式碼如下：

import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.Priority;

/**
 * @desc:
 * @since Apr 17, 2013
 * @author chaisson
 *
 * <p>
 */
public class MyAppender extends DailyRollingFileAppender {

    @Override
    public boolean isAsSevereAsThreshold(Priority priority) {
        //只判斷是否相等，而不判斷優先順序
        return this.getThreshold().equals(priority);
    }
}