java 生成log4j_Java log4j配置每天生成一个日志文件 - 永恒ぃ☆心 的日志 - 网易博客...
一、配置屬性文件log4j.properties
log4j.rootLogger=INFO,stdout,R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} %5p [%t] (%F\:%L) - %m%n
log4j.appender.R=org.apache.log4j.DailyRollingFileAppender
log4j.appender.R.File=/home/log/system
log4j.appender.R.DatePattern ='.'yyyy-MM-dd'.log'
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%-d{yyyy-MM-dd HH\:mm\:ss} [%c]-[%p] [%t] (%F\:%L) ->%m %n
二、項目初始化log4j
PropertyConfigurator.configure(log4j);
.......
此步驟略。
三、修改log4j源代碼中DailyRollingFileAppender.java文件。
將log4j的源文件加入項目中。修改：
/**
* Rollover the current file to a new file.
*/
void rollOver() throws IOException {
/* Compute filename, but only if datePattern is specified */
if (datePattern == null) {
errorHandler.error("Missing DatePattern option in rollOver().");
return;
}
String datedFilename = fileName + sdf.format(now);
// It is too early to roll over because we are still within the
// bounds of the current interval. Rollover will occur once the
// next interval is reached.
if (scheduledFilename.equals(datedFilename)) {
return;
}
// close current file, and rename it to datedFilename
this.closeFile();
File target = new File(scheduledFilename);
if (target.exists()) {
target.delete();
}
File file = new File(fileName);
// boolean result = file.renameTo(target);??boolean result = copy(file, target);??if (result) {
LogLog.debug(fileName + " -> " + scheduledFilename);
} else {
LogLog.error("Failed to rename [" + fileName + "] to ["
+ scheduledFilename + "].");
}
try {
// This will also close the file. This is OK since multiple
// close operations are safe.
this.setFile(fileName, false, this.bufferedIO, this.bufferSize);
} catch (IOException e) {
errorHandler.error("setFile(" + fileName + ", false) call failed.");
}
scheduledFilename = datedFilename;
}
修改刪除黃色代碼，并添加藍色代碼。
并加入方法copy。
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("源文件不存在,或者目標文件無法被識別.");
return false;
} catch (IOException e) {
LogLog.error("文件讀寫錯誤.");
return false;
}
}
原因：
如果不修改DailyRollingFileAppender中的renameTo方法，發報錯：Log4j的log4j:ERROR Failed to rename錯誤。
總結
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