log4j1 修改FileAppender解决当天的文件没有日期后缀

直接上代码：

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
package org.apache.log4j;
 
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InterruptedIOException;
import java.io.Writer;
 
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.helpers.QuietWriter;
import org.apache.log4j.spi.ErrorCode;
 
import reyo.sdk.utils.DateTimeUtils;
import reyo.sdk.utils.StringUtils;
 
// Contibutors: Jens Uwe Pipka <jens.pipka@gmx.de>
//              Ben Sandee
 
/**
 *  FileAppender appends log events to a file.
 *
 *  <p>Support for <code>java.io.Writer</code> and console appending
 *  has been deprecated and then removed. See the replacement
 *  solutions: {@link WriterAppender} and {@link ConsoleAppender}.
 *
 * @author Ceki Gülcü
 * */
public class FileAppender extends WriterAppender {
 
    /** Controls file truncatation. The default value for this variable
     * is <code>true</code>, meaning that by default a
     * <code>FileAppender</code> will append to an existing file and not
     * truncate it.
     *
     * <p>This option is meaningful only if the FileAppender opens the
     * file.
     */
    protected boolean fileAppend = true;
 
    /**
     The name of the log file. */
    protected String fileName = null;
 
    /**
     Do we do bufferedIO? */
    protected boolean bufferedIO = false;
 
    /**
     * Determines the size of IO buffer be. Default is 8K.
     */
    protected int bufferSize = 8 * 1024;
 
    /**
     The default constructor does not do anything.
    */
    public FileAppender() {
    }
 
    /**
    Instantiate a <code>FileAppender</code> and open the file
    designated by <code>filename</code>. The opened filename will
    become the output destination for this appender.
     
    <p>If the <code>append</code> parameter is true, the file will be
    appended to. Otherwise, the file designated by
    <code>filename</code> will be truncated before being opened.
     
    <p>If the <code>bufferedIO</code> parameter is <code>true</code>,
    then buffered IO will be used to write to the output file.
     
    */
    public FileAppender(Layout layout, String filename, boolean append, boolean bufferedIO, int bufferSize)
            throws IOException {
        this.layout = layout;
        this.setFile(filename, append, bufferedIO, bufferSize);
    }
 
    /**
    Instantiate a FileAppender and open the file designated by
    <code>filename</code>. The opened filename will become the output
    destination for this appender.
     
    <p>If the <code>append</code> parameter is true, the file will be
    appended to. Otherwise, the file designated by
    <code>filename</code> will be truncated before being opened.
    */
    public FileAppender(Layout layout, String filename, boolean append) throws IOException {
        this.layout = layout;
        this.setFile(filename, append, false, bufferSize);
    }
 
    /**
     Instantiate a FileAppender and open the file designated by
    <code>filename</code>. The opened filename will become the output
    destination for this appender.
     
    <p>The file will be appended to.  */
    public FileAppender(Layout layout, String filename) throws IOException {
        this(layout, filename, true);
    }
 
    /**
     The <b>File</b> property takes a string value which should be the
     name of the file to append to.
     
     <p><font color="#DD0044"><b>Note that the special values
     "System.out" or "System.err" are no longer honored.</b></font>
     
     <p>Note: Actual opening of the file is made when {@link
     #activateOptions} is called, not when the options are set.  */
    public void setFile(String file) {
        // Trim spaces from both ends. The users probably does not want
        // trailing spaces in file names.
        String val = file.trim();
        fileName = val;
    }
 
    /**
      Returns the value of the <b>Append</b> option.
     */
    public boolean getAppend() {
        return fileAppend;
    }
 
    /** Returns the value of the <b>File</b> option. */
    public String getFile() {
        return fileName;
    }
 
    /**
     If the value of <b>File</b> is not <code>null</code>, then {@link
     #setFile} is called with the values of <b>File</b>  and
     <b>Append</b> properties.
     
     @since 0.8.1 */
    @Override
    public void activateOptions() {
 
        String filetype = fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length());
        if (StringUtils.isEmpty(filetype)) {
            fileName = fileName + DateTimeUtils.getCurrentDate() + ".log";
        }
 
        if (fileName != null) {
            try {
                setFile(fileName, fileAppend, bufferedIO, bufferSize);
            } catch (java.io.IOException e) {
                errorHandler.error("setFile(" + fileName + "," + fileAppend + ") call failed.", e,
                        ErrorCode.FILE_OPEN_FAILURE);
            }
        } else {
            //LogLog.error("File option not set for appender ["+name+"].");
            LogLog.warn("File option not set for appender [" + name + "].");
            LogLog.warn("Are you using FileAppender instead of ConsoleAppender?");
        }
    }
 
    /**
     Closes the previously opened file.
     */
    protected void closeFile() {
        if (this.qw != null) {
            try {
                this.qw.close();
            } catch (java.io.IOException e) {
                if (e instanceof InterruptedIOException) {
                    Thread.currentThread().interrupt();
                }
                // Exceptionally, it does not make sense to delegate to an
                // ErrorHandler. Since a closed appender is basically dead.
                LogLog.error("Could not close " + qw, e);
            }
        }
    }
 
    /**
     Get the value of the <b>BufferedIO</b> option.
     
     <p>BufferedIO will significatnly increase performance on heavily
     loaded systems.
     
    */
    public boolean getBufferedIO() {
        return this.bufferedIO;
    }
 
    /**
     Get the size of the IO buffer.
    */
    public int getBufferSize() {
        return this.bufferSize;
    }
 
    /**
     The <b>Append</b> option takes a boolean value. It is set to
     <code>true</code> by default. If true, then <code>File</code>
     will be opened in append mode by {@link #setFile setFile} (see
     above). Otherwise, {@link #setFile setFile} will open
     <code>File</code> in truncate mode.
     
     <p>Note: Actual opening of the file is made when {@link
     #activateOptions} is called, not when the options are set.
     */
    public void setAppend(boolean flag) {
        fileAppend = flag;
    }
 
    /**
     The <b>BufferedIO</b> option takes a boolean value. It is set to
     <code>false</code> by default. If true, then <code>File</code>
     will be opened and the resulting {@link java.io.Writer} wrapped
     around a {@link BufferedWriter}.
     
     BufferedIO will significatnly increase performance on heavily
     loaded systems.
     
    */
    public void setBufferedIO(boolean bufferedIO) {
        this.bufferedIO = bufferedIO;
        if (bufferedIO) {
            immediateFlush = false;
        }
    }
 
    /**
     Set the size of the IO buffer.
    */
    public void setBufferSize(int bufferSize) {
        this.bufferSize = bufferSize;
    }
 
    /**
    <p>Sets and <i>opens</i> the file where the log output will
    go. The specified file must be writable.
     
    <p>If there was already an opened file, then the previous file
    is closed first.
     
    <p><b>Do not use this method directly. To configure a FileAppender
    or one of its subclasses, set its properties one by one and then
    call activateOptions.</b>
     
    @param fileName The path to the log file.
    @param append   If true will append to fileName. Otherwise will
        truncate fileName.  */
    public synchronized void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize)
            throws IOException {
        LogLog.debug("setFile called: " + fileName + ", " + append);
 
        // It does not make sense to have immediate flush and bufferedIO.
        if (bufferedIO) {
            setImmediateFlush(false);
        }
 
        reset();
        FileOutputStream ostream = null;
        try {
            //
            //   attempt to create file
            //
            ostream = new FileOutputStream(fileName, append);
        } catch (FileNotFoundException ex) {
            //
            //   if parent directory does not exist then
            //      attempt to create it and try to create file
            //      see bug 9150
            //
            String parentName = new File(fileName).getParent();
            if (parentName != null) {
                File parentDir = new File(parentName);
                if (!parentDir.exists() && parentDir.mkdirs()) {
                    ostream = new FileOutputStream(fileName, append);
                } else {
                    throw ex;
                }
            } else {
                throw ex;
            }
        }
        Writer fw = createWriter(ostream);
        if (bufferedIO) {
            fw = new BufferedWriter(fw, bufferSize);
        }
        this.setQWForFiles(fw);
        this.fileName = fileName;
        this.fileAppend = append;
        this.bufferedIO = bufferedIO;
        this.bufferSize = bufferSize;
        writeHeader();
        LogLog.debug("setFile ended");
    }
 
    /**
     Sets the quiet writer being used.
     
     This method is overriden by {@link RollingFileAppender}.
     */
    protected void setQWForFiles(Writer writer) {
        this.qw = new QuietWriter(writer, errorHandler);
    }
 
    /**
     Close any previously opened file and call the parent's
     <code>reset</code>.  */
    @Override
    protected void reset() {
        closeFile();
        this.fileName = null;
        super.reset();
    }
}