关于log4j日志扩展

关于log4j日志扩展

目录log4j日志扩展---PatternLayout这是log4j官网上的配置下载官方文件发现有这样两个类给大家举个例子故完整的代码扩展log4j---自定义日志文件创建log4j配置如下

log4j日志扩展---PatternLayout

目前扩展log4j的日志一般使用扩展adaper的方法，这里使用一种扩展PatternLayout方法。

log4j.rootLogger=debug, 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=%5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender

log4j.appender.R.File=example.log

log4j.appender.R.MaxFileSize=100KB

# Keep one backup file

log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout

log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

这是log4j官网上的配置

请注意：

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.R.layout=org.apache.log4j.PatternLayout

注意到其实这是两个类

那么org.apache.log4j.ConsoleAppender可以自定义,思考是否可以自定义log4j.appender.R.layout=org.apache.log4j.PatternLayout

下载官方文件发现有这样两个类

/*

* 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://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 examples;

import org.apache.log4j.*;

import org.apache.log4j.helpers.PatternParser;

/**

Example showing how to extend PatternLayout to recognize additional

conversion characters.

In this case MyPatternLayout recognizes %# conversion pattern. It

outputs the value of an internal counter which is also incremented

at each call.

See source code

for more details.

@see MyPatternParser

@see org.apache.log4j.PatternLayout

@author Anders Kristensen

*/

public class MyPatternLayout extends PatternLayout {

public

MyPatternLayout() {

this(DEFAULT_CONVERSION_PATTERN);

}

public

MyPatternLayout(String pattern) {

super(pattern);

}

public

PatternParser createPatternParser(String pattern) {

return new MyPatternParser(

pattern == null ? DEFAULT_CONVERSION_PATTERN : pattern);

}

public

static void main(String[] args) {

Layout layout = new MyPatternLayout("[counter=%.10#] - %m%n");

Logger logger = Logger.getLogger("some.cat");

logger.addAppender(new ConsoleAppender(layout, ConsoleAppender.SYSTEM_OUT));

logger.debug("Hello, log");

logger.info("Hello again...");

}

}

/*

* 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://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 examples;

import org.apache.log4j.helpers.FormattingInfo;

import org.apache.log4j.helpers.PatternConverter;

import org.apache.log4j.helpers.PatternParser;

import org.apache.log4j.spi.LoggingEvent;

/**

Example showing how to extend PatternParser to recognize additional

conversion characters. The examples shows that minimum and maximum

width and alignment settings apply for "extension" conversion

characters just as they do for PatternLayout recognized characters.

In this case MyPatternParser recognizes %# and outputs the value

of an internal counter which is also incremented at each call.

See source code

for more details.

@see org.apache.log4j.examples.MyPatternLayout

@see org.apache.log4j.helpers.PatternParser

@see org.apache.log4j.PatternLayout

@author Anders Kristensen

*/

public class MyPatternParser extends PatternParser {

int counter = 0;

public

MyPatternParser(String pattern) {

super(pattern);

}

public

void finalizeConverter(char c) {

if (c == '#') {

addConverter(new UserDirPatternConverter(formattingInfo));

currentLiteral.setLength(0);

} else {

super.finalizeConverter(c);

}

}

private class UserDirPatternConverter extends PatternConverter {

UserDirPatternConverter(FormattingInfo formattingInfo) {

super(formattingInfo);

}

public

String convert(LoggingEvent event) {

return String.valueOf(++counter);

}

}

}

直接粘过去找个类测试一下发现是可以使用的,显示打印日志的行数

发现MyPatternLayout基本调用的是父类的方法

继续扒

public

void finalizeConverter(char c) {

if (c == '#') {

addConverter(new UserDirPatternConverter(formattingInfo));

currentLiteral.setLength(0);

} else {

super.finalizeConverter(c);

}

}

注意看这段代码

发现字符为"#"的时候,创建了UserDirPatternConverter

推荐大家去看PatternParser这里面有答案

给大家举个例子

%#{MMMM}

使用extractOption()可以获得MMMM

有了MMMM是不是就可以处理很多问题.

想一下,比如我们要在日志里面打印公司的编号 orgId

那么首先配置

log4j.appender.R.layout.ConversionPattern= %#{orgId} %p %t %c - %m%n

这样的话

if (c == '#') {

String exs = super.extractOption(); //获取orgId

addConverter(new ExrPatternConverter(formattingInfo, exs));

currentLiteral.setLength(0);

} else {

super.finalizeConverter(c);

}

考虑orgId的赋值问题

使用ThreadLocal

故完整的代码

package com.yogapay.core;

import java.util.HashMap;

import java.util.Map;

import org.apache.log4j.helpers.FormattingInfo;

import org.apache.log4j.helpers.PatternConverter;

import org.apache.log4j.helpers.PatternParser;

import org.apache.log4j.spi.LoggingEvent;

public class ExPatternParser extends PatternParser {

static final ThreadLocal

@Override

protected HashMap initialValue() {

return new HashMap();

}

};

public static void setCurrentValue(String key, Object value) {

Map map = TH_LOCAL.get();

map.put(key, value);

}

public ExPatternParser(String pattern) {

super(pattern);

}

public void finalizeConverter(char c) {

if (c == '#') {

String exs = super.extractOption();

addConverter(new ExrPatternConverter(formattingInfo, exs));

currentLiteral.setLength(0);

} else {

super.finalizeConverter(c);

}

}

private class ExrPatternConverter extends PatternConverter {

private String cfg;

ExrPatternConverter(FormattingInfo formattingInfo, String cfg) {

super(formattingInfo);

this.cfg = cfg;

}

public String convert(LoggingEvent event) {

Map valueMap = TH_LOCAL.get();

if (valueMap != null) {

Object value = valueMap.get(cfg);

if (value != null) {

return String.valueOf(value);

}

}

return "";

}

}

}

package com.yogapay.core;

import org.apache.log4j.*;

import org.apache.log4j.helpers.PatternParser;

public class ExPatternLayout extends PatternLayout {

public ExPatternLayout() {

this(DEFAULT_CONVERSION_PATTERN);

}

public EIyWYjrxPatternLayout(String pattern) {

super(pattern);

}

@Override

public PatternParser createPatternParser(String pattern) {

return new ExPatternParser(pattern == null ? DEFAULT_CONVERSION_PATTERN : pattern);

}

}

### set log levels ###

log4j.rootLogger = info,stdout

### 输出到控制台 ###

log4j.appender.stdout = org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target = System.out

log4j.appender.stdout.layout = com.yogapay.core.ExPatternLayout

log4j.appender.stdout.layout.ConversionPattern = lgcNo:%#{orgId} %d{yyyy-MM-dd HH:mm:ss} [%t] %p [%c] - %m%n

到此扩展就完成呢！

扩展log4j---自定义日志文件创建

之前使用过logstash，发现它的文件写入功能比log4j更加完善

logstash允许动态创建文件夹，我只使用了按照日期创建日志文件

如果配置日志路径如下

/home/log/log/%{yyyy}/%{MM}/%{dd}-log.log

那么就会创建路径为/home/log/log/2018/06/12-log.log的文件

log4j有个DailyRollingFileAppender，支持按一定时间规则写入日志，但是创建规则是在原有的日志文件之后加上时间后缀，这样所有日志文件都在一个文件夹，非常不友好

因此，我自定义了appender，允许创建文件夹的方式存储日志文件，每天凌晨写入新的日志文件

内容如下

import org.apache.log4j.spi.LoggingEvent;

import java.io.File;

import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

* @author 墨盒

*/

public class EveryDayRollingFileAppender extends FileAppender {

private SimpleDateFormat format;

private String fileName;

private Level level;

private static final String SEPERTOR = "-";

private String regex = "\\{([^\\{\\}]+)\\}";//

private long next;

private Date now;

public Level getLevel() {

return level;

}

public void setLevel(Level level) {

this.level = level;

}

public EveryDayRollingFileAppender() {

now = new Date();

level = Level.WARN;

}

public String getFileName() {

return fileName;

}

public void setFileName(String fileName) {

this.fileName = fileName;

}

//TODO 18-6-16 该方法被调用了两次

@Override

public void activateOptions() {

Pattern pattern = Pattern.compile(regex);

Matcher matcher = pattern.matcher(fileName);

StringBuilder builder = new StringBuilder();

while (matcher.find()) {

String temp = matcher.group(1);

builder.append(temp).append(SEPERTOR);

}

if (builder.length() != 0) {

format = new SimpleDateFormat(builder.deleteCharAt(builder.length() - 1).toString());

changeFile();

setNextTime();日志采集小工具

} else {

format = null;

try {

setFile(fileName, getAppend(), getBufferedIO(), getBufferSize());

} catch (IOException e) {

e.printStackTrace();

}

}

}

private void changeFile() {

if (format != null) {

try {

setFile(createFile(), getAppend(), getBufferedIO(), getBufferSize());

} catch (IOException e) {

e.printStackTrace();

}

}

}

protected void setNextTime() {

Calendar c = Calendar.getInstance();

c.setTime(now);

c.add(Calendar.DAY_OF_YEAR, 1);

c.set(Calendar.MINUTE, 0);

c.set(Calendar.HOUR, 0);

c.set(Calendar.SECOND, 0);

c.set(Calendar.MILLISECOND, 0);

next = c.getTimeInMillis();

System.out.println(new Date(next));

}

@Override

protIyWYjrected void subAppend(LoggingEvent event) {

if (event.getLevel().syslogEquivalent <= level.syslogEquivalent) {

long n = System.currentTimeMillis();

if (n >= next) {

now.setTime(n);

changeFile();

setNextTime();

}

super.subAppend(event);

}

}

public String createFile() {

String file = format.format(now);

String s[] = file.split(SEPERTOR);

String temp = fileName;

for (int i = 0; i < s.length; i++) {

temp = temp.replaceFirst(regex, s[i]);

}

File f = new File(temp);

if (!f.gehttp://tParentFile().exists())

f.getParentFile().mkdirs();

else if (f.exists())

f.delete();

return f.getAbsolutePath();

}

}

log4j配置如下

log4j.appender.logfile=org.apache.log4j.EveryDayRollingFileAppender

# 需要写入的日志级别

log4j.appender.logfile.level=INFO

# 日志路径

log4j.appender.logfile.fileName=/home/inkbox/log/log/{yyyy}/{MM}/{dd}_logSocket.log

log4j.appender.logfile.layout=org.apache.log4j.PatternLayout

log4j.appender.logfile.layout.ConversionPattern=%m%n

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