??1 ? import ?java.io.File;
??2 ? import ?java.io.IOException;
??3 ? import ?java.text.SimpleDateFormat;
??4 ? import ?java.util.ArrayList;
??5 ? import ?java.util.Calendar;
??6 ? import ?java.util.Date;
??7 ? import ?java.util.List;
??8 ?
??9 ? import ?org.apache.log4j.FileAppender;
?10 ? import ?org.apache.log4j.Layout;
?11 ? import ?org.apache.log4j.helpers.LogLog;
?12 ? import ?org.apache.log4j.spi.LoggingEvent;
?13 ?
?14 ?
?15 ? /**
?16 ? *?this?is?an?extend?class?of?appender,?which?is?suitable?for?the?specified
?17 ? *?datePattern--"yyyy-MM-dd"?and?the?maxBackupIdex?is?not?configurable.
?18 ? *?
?19 ? */
?20 ? public ? class ?DayRollingFileAppender? extends ?FileAppender?{
?21 ?
?22 ? /** ?datepattern?was?fixed?as?yyyy-MM-dd? */
?23 ? private ? final ?String?datePattern? = ? " '.'yyyy-MM-dd " ;
?24 ?
?25 ? /** ?the?default?max?count?of?log?files? */
?26 ? private ? int ?maxBackupIndex? = ? 10 ;
?27 ?
?28 ? /** ?file?name?+?date?of?last?time? */
?29 ? private ?String?scheduledFilename;
?30 ?
?31 ? /**
?32 ? ?????????*?The?next?time?we?estimate?a?rollover?should?occur.
?33 ? ????????? */
?34 ? private ? long ?nextCheck? = ?System.currentTimeMillis()? - ? 1 ;
?35 ?
?36 ? Date?now? = ? new ?Date();
?37 ?
?38 ? SimpleDateFormat?sdf;
?39 ?
?40 ? /**
?41 ? ?????????*?The?default?constructor?does?nothing.
?42 ? ????????? */
?43 ? public ?DayRollingFileAppender()?{
?44 ? }
?45 ?
?46 ? public ?DayRollingFileAppender(Layout?layout,?String?filename,
?47 ? int ?maxBackupIndex)? throws ?IOException?{
?48 ? super (layout,?filename,? true );
?49 ? this .maxBackupIndex? = ?maxBackupIndex;
?50 ? activateOptions();
?51 ? }
?52 ?
?53 ? /**
?54 ? ?????????*?used?for?inital?the?appender
?55 ? ????????? */
?56 ? public ? void ?activateOptions()?{
?57 ? super .activateOptions();
?58 ? if ?(fileName? != ? null )?{? // ?perf.log
?59 ? now.setTime(System.currentTimeMillis());
?60 ? sdf? = ? new ?SimpleDateFormat(datePattern);
?61 ? File?file? = ? new ?File(fileName);
?62 ? // ?include?the?latest?time?as?the?file?name
?63 ? scheduledFilename? = ?fileName
?64 ? + ?sdf.format( new ?Date(file.lastModified()));
?65 ? }? else ?{
?66 ? LogLog.error( " File?is?not?set?for?appender?[ " ? + ?name? + ? " ]. " );
?67 ? }
?68 ? if ?(maxBackupIndex? <= ? 0 )?{
?69 ? LogLog
?70 ? .error( " maxBackupIndex?reset?to?default?value[2],orignal?value?is: "
?71 ? + ?maxBackupIndex);
?72 ? maxBackupIndex? = ? 10 ;
?73 ? }
?74 ? }
?75 ?
?76 ? /**
?77 ? ?????????*?to?update,?if?necessary,?rename?the?file?including?the?current?date?and
?78 ? ?????????*?according?to?the?maxBackupIndex,?delete?the?expired?file.
?79 ? ?????????*?
?80 ? ????????? */
?81 ? void ?rollOver()? throws ?IOException?{
?82 ?
?83 ? String?datedFilename? = ?fileName? + ?sdf.format(now);
?84 ? // ?there?is?no?need?to?update?the?file?if?the?current?date?is?the?same
?85 ? // ?as?last?time
?86 ? if ?(scheduledFilename.equals(datedFilename))?{
?87 ? return ;
?88 ? }
?89 ?
?90 ? // ?close?current?file,?and?rename?it?to?datedFilename
?91 ? this .closeFile();
?92 ?
?93 ? File?target? = ? new ?File(scheduledFilename);
?94 ? if ?(target.exists())?{
?95 ? target.delete();
?96 ? }
?97 ?
?98 ? File?file? = ? new ?File(fileName);
?99 ? boolean ?result? = ?file.renameTo(target);
100 ? if ?(result)?{
101 ? LogLog.debug(fileName? + ? " ?->? " ? + ?scheduledFilename);
102 ? }? else ?{
103 ? LogLog.error( " Failed?to?rename?[ " ? + ?fileName? + ? " ]?to?[ "
104 ? + ?scheduledFilename? + ? " ]. " );
105 ? }
106 ?
107 ? // ?delete?the?expired?log?files?according?to?the?maxBackupIndex
108 ? if ?(maxBackupIndex? > ? 0 )?{
109 ? File?folder? = ? new ?File(file.getParent());
110 ? List < String > ?maxBackupIndexDates? = ?getMaxBackupIndexDates();
111 ? // ?go?through?the?folder?and?delete?the?files?which?are?not?in?the
112 ? // ?permitted?dates.
113 ? for ?(File?ff?:?folder.listFiles())?{
114 ? if ?(ff.getName().startsWith(file.getName())
115 ? && ? ! ff.getName().equals(file.getName()))?{
116 ? // ?get?the?date?string?from?the?file?name
117 ? String?markedDate? = ?ff.getName().substring(
118 ? file.getName().length());
119 ? if ?( ! maxBackupIndexDates.contains(markedDate))?{
120 ? result? = ?ff.delete();
121 ? }
122 ? if ?(result)?{
123 ? LogLog.debug(ff.getName()? + ? " ?->deleted? " );
124 ? }? else ?{
125 ? LogLog
126 ? .error( " Failed?to?deleted?old?DayRollingFileAppender?file?: "
127 ? + ?ff.getName());
128 ? }
129 ? }
130 ? }
131 ? }
132 ?
133 ? try ?{
134 ? // ?This?will?also?close?the?file.?This?is?OK?since?multiple
135 ? // ?close?operations?are?safe.
136 ? this .setFile(fileName,? false ,? this .bufferedIO,? this .bufferSize);
137 ? }? catch ?(IOException?e)?{
138 ? errorHandler.error( " setFile( " ? + ?fileName? + ? " ,?false)?call?failed. " );
139 ? }
140 ?
141 ? // ?update?the?date?of?the?file
142 ? scheduledFilename? = ?datedFilename;
143 ? }
144 ?
145 ? /**
146 ? ?????????*?Actual?writing?occurs?here.
147 ? ?????????*? */
148 ? protected ? void ?subAppend(LoggingEvent?event)?{
149 ? long ?n? = ?System.currentTimeMillis();
150 ?
151 ? // ?roll?over?when?a?new?day?comes,?the?first?time?will?roll?over
152 ? if ?(n? >= ?nextCheck)?{
153 ? now.setTime(n);
154 ? nextCheck? = ?getNextDayCheckPoint(now);
155 ? try ?{
156 ? rollOver();
157 ? }? catch ?(IOException?ioe)?{
158 ? LogLog.error( " rollOver()?failed. " ,?ioe);
159 ? }
160 ? }
161 ? super .subAppend(event);
162 ? }
163 ?
164 ? /**
165 ? ?????????*?get?the?exchange?point?of?next?day
166 ? ?????????*?
167 ? ?????????*? @param ?now
168 ? ?????????*? @return
169 ? ????????? */
170 ? long ?getNextDayCheckPoint(Date?now)?{
171 ? Calendar?calendar? = ?Calendar.getInstance();
172 ? calendar.setTime(now);
173 ? calendar.set(Calendar.HOUR_OF_DAY,? 0 );
174 ? calendar.set(Calendar.MINUTE,? 0 );
175 ? calendar.set(Calendar.SECOND,? 0 );
176 ? calendar.set(Calendar.MILLISECOND,? 0 );
177 ? calendar.add(Calendar.DATE,? 1 );
178 ? return ?calendar.getTimeInMillis();
179 ? }
180 ?
181 ? /** ?
182 ? ???*?get?the?scope?of?the?log?file?date?according?to?the?count?of?log?files?which?need?to?be?backup
183 ? ???*?
184 ? ???*? @return ?list<'fileName+yyyy-MM-dd'>?
185 ? ??? */
186 ? List < String > ?getMaxBackupIndexDates()?{
187 ? List < String > ?result? = ? new ?ArrayList < String > ();
188 ? if ?(maxBackupIndex? > ? 0 )?{
189 ? for ?( int ?i? = ? 1 ;?i? <= ?maxBackupIndex;?i ++ )?{
190 ? Calendar?calendar? = ?Calendar.getInstance();
191 ? calendar.setTime(now);
192 ? calendar.set(Calendar.HOUR_OF_DAY,? 0 );
193 ? calendar.set(Calendar.MINUTE,? 0 );
194 ? calendar.set(Calendar.SECOND,? 0 );
195 ? calendar.set(Calendar.MILLISECOND,? 0 );
196 ? calendar.add(Calendar.DATE,? - i);
197 ? result.add(sdf.format(calendar.getTime()));
198 ? }
199 ? }
200 ? return ?result;
201 ? }
202 ?
203 ? public ? int ?getMaxBackupIndex()?{
204 ? return ?maxBackupIndex;
205 ? }
206 ?
207 ? public ? void ?setMaxBackupIndex( int ?maxBackupIndex)?{
208 ? this .maxBackupIndex? = ?maxBackupIndex;
209 ? }
210 ?
211 ? public ?String?getDatePattern()?{
212 ? return ?datePattern;
213 ? }
214 ?
215 ? // ?public?static?void?main(String[]?args)?{
216 ? // ?DOMConfigurator.configure(xxx.xml);
217 ? // ?Logger?log?=?Logger.getLogger("A.log");
218 ? // ?log.info("test");
219 ? // ?}
220 ? }