æ ÒŽ®Log4Jçš„é…¾|®æ–‡ä»Óž¼Œä½¿ç”¨LOG4Jçš„DailyRollingFileAppender.java实现æ¯éš”一ŒD‰|—¶é—´è®°å½•ä¸€‹Æ¡æ—¥å¿—æ–‡ä»Óž¼Œä½†LOG4J在对原文件改åæ—¶åQŒæ€ÀL˜¯æ示log4j:ERROR Failed to rename的错误，½I¶å…¶åŽŸå› åQŒä¸»è¦æ˜¯˜q˜æœ‰˜q›ç¨‹åœ¨ä‹É用原æ¥çš„LOGæ–‡äšgåQŒè€Œé€šè¿‡åˆ†æžLOG4Jçš„æºç ，å‘现LOG4J是采用RENAMEçš„æ–¹å¼å¯¹åŽŸæ¥çš„LOGæ–‡äšg改åå†ç”Ÿæˆæ–°æ–‡äšgã€?br />
引è“vlog4j:ERROR Failed to renameçš„æ¡ä»?br />通常都是在酾|®æ–‡ä»‰™‡‡ç”¨Java代ç
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
或�nbsp;
log4j.appender.A1=org.apache.log4j.RollingFileAppender
的情况下é‡åˆ°"异常"æ示ã€?br />和异常相关的log4jæºä»£ç ?br />
File file = new File(fileName);
boolean result = file.renameTo(target);
if(result) {
LogLog.debug(fileName +" -> "+ scheduledFilename);
} else {
LogLog.error("Failed to rename ["+fileName+"] to ["+scheduledFilename+"].");
}
File¾cÈš„renameToæ–ÒŽ³•çš„作用是åQ?#8220;改å或者移动文件作用；在åŒä¸€ä¸ªç›®å½•ä¸‹renameTo是改å，在ä¸åŒç›®å½•ä¸‹æ˜¯ç§»åŠ?#8221;åQŒæ‰€ä»¥åœ¨å¯¹ä¸€ä¸ªè¢«å…¶ä»–¾U¿ç¨‹æ‰€é”定的文件进行改åæ—¶åQŒè‚¯å®šæ˜¯ä¼šæŠ¥é”™çš„ã€?br />boolean result = file.renameTo(target);
if(result) {
LogLog.debug(fileName +" -> "+ scheduledFilename);
} else {
LogLog.error("Failed to rename ["+fileName+"] to ["+scheduledFilename+"].");
}
解决办法
修改log4jçš„æºä»£ç , ž®?
boolean result = file.renameTo(target);
改äØ“boolean result = copy(file, target);
然åŽå†æ·»åŠ copy()æ–ÒŽ³•ã€?
/**
* Copies src file to dst file. If the dst file does not exist, it is
* created.8KB cache
*
* @param src
* @param dst
* @throws IOException
*/
boolean copy(File src, File dst) throws IOException {
try {
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst);
// Transfer bytes from in to out
byte[] buf = new byte[8192];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
return true;
} catch (FileNotFoundException e) {
LogLog.error("æºæ–‡ä»¶ä¸å˜åœ¨,æˆ–è€…ç›®æ ‡æ–‡ä»¶æ— æ³•è¢«è¯†åˆ«." );
return false;
} catch (IOException e) {
LogLog.error("æ–‡äšgè¯Õd†™é”™è¯¯.");
return false;
}
}
* Copies src file to dst file. If the dst file does not exist, it is
* created.8KB cache
*
* @param src
* @param dst
* @throws IOException
*/
boolean copy(File src, File dst) throws IOException {
try {
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst);
// Transfer bytes from in to out
byte[] buf = new byte[8192];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
return true;
} catch (FileNotFoundException e) {
LogLog.error("æºæ–‡ä»¶ä¸å˜åœ¨,æˆ–è€…ç›®æ ‡æ–‡ä»¶æ— æ³•è¢«è¯†åˆ«." );
return false;
} catch (IOException e) {
LogLog.error("æ–‡äšgè¯Õd†™é”™è¯¯.");
return false;
}
}
附äšgåQ?a href="/Files/DreamAngel/DailyRollingFileAppender.zip">DailyRollingFileAppender.zip
飞翔天ä‹É 2011-11-10 11:48 å‘表评论
]]>
log4j.propertiesçš„å˜æ”¾ä½¾|?/strong>
在ä‹Éç”?/span>eclipseæˆ?/span>myeclipseæ—Óž¼Œæ— è®ºä½ å†™çš?/span>java½E‹åºæ˜¯å¤„åœ?/span>src目录下的哪个包ä¸åQŒåªéœ€è¦å°†è®„¡½®å¥½çš„log4j.propertiesæ–‡äšg攑֜¨srcçš„æ ¹ç›®å½•å›_¯åQŒè¿™æ ·åœ¨˜qè¡Œ¾~–译时会自动生战q™ä¸ªæ–‡äšg的备份å˜å…¥åˆ°WEF-INF/classes目录下，æˆ?/span>bin目录下ã€?/span>
注：åƒä¸‡ä¸è¦æ”‘Öˆ°åŒ…内åQŒè¿™æ ·ä¼šå‡ºçŽ°é”™è¯¯æ示åQ?/span>
log4j:WARN No appenders could be found for logger (aa.Hello).
log4j:WARN Please initialize the log4j system properly.
å…¶ä¸Helloæ˜?/span>javaæ–‡äšgå，è€?/span>aa是文件所在的目录ã€?
log4jå¸¸ç”¨è¾“å‡ºæ ¼å¼
%c 列出loggeråå—½Iºé—´çš„å…¨¿UŽÍ¼Œå¦‚åŠ ä¸Š{<层数>}表示å‡ÞZ»Žæœ€å†…层½Ž—è“v的指定层数的åå—½Iºé—´
%X 按MDCåQˆMapped Diagnostic Context,¾U¿ç¨‹æ˜ 射表）输出日志。通常用于多个客户端连接åŒä¸€å°æœåŠ¡å™¨åQŒæ–¹ä¾¿æœåŠ¡å™¨åŒºåˆ†æ˜¯é‚£ä¸ªå®¢æˆïL«¯è®‰K—®ç•™ä¸‹æ¥çš„日志ã€?br />%p 日志信毾U§åˆ«
%d %d{<æ—¥æœŸæ ¼å¼>}:日志信æ¯äº§ç”Ÿæ—‰™—´,使用ISO8601å®šä¹‰çš„æ—¥æœŸæ ¼å¼?br />%C 日志信æ¯æ‰€åœ¨åœ°åQˆå…¨é™ç±»å）
%m 产生的日志具体信æ?br />%n 输出日志信æ¯æ¢è¡Œ
%F　昄¡¤ºè°ƒç”¨loggerçš„æºæ–‡äšgå?br />%l 输出日志事äšgçš„å‘生佾|®ï¼ŒåŒ…括¾cÈ›®åã€å‘生的¾U¿ç¨‹åQŒä»¥åŠåœ¨ä»£ç ä¸çš„行数
%L 昄¡¤ºè°ƒç”¨logger的代ç è¡Œ
%M 昄¡¤ºè°ƒç”¨logger的方法å
%r 昄¡¤ºä»Žç¨‹åºå¯åŠ¨æ—¶åˆ°è®°å½•è¯¥æ¡æ—¥å¿—时已绾l过的毫¿U’æ•°
%t 输出产生该日志事件的¾U¿ç¨‹å?br />%%　昄¡¤ºä¸€ä¸?nbsp;
飞翔天ä‹É 2009-02-27 11:16 å‘表评论
]]>