log4j向log4j2的升级

升级之后程序里的日志记录代码不需要更改，实验证明log4j2比log4j效率更高

1、引入官方log4j2 相关资源，maven依赖如下

2、resource目录下增加log4j2.xml文件

3、自定义的layout类，可以根据自己需要改写

package com.bbk.watch.store.common.log4j;

importjava.io.PrintWriter;

importjava.io.StringWriter;

importjava.io.Writer;

import java.nio.charset.Charset;

import java.util.Date;

import org.apache.commons.lang.exception.ExceptionUtils;

import org.apache.logging.log4j.core.LogEvent;

import org.apache.logging.log4j.core.config.plugins.Plugin;

import org.apache.logging.log4j.core.config.plugins.PluginAttribute;

import org.apache.logging.log4j.core.config.plugins.PluginFactory;

import org.apache.logging.log4j.core.layout.AbstractStringLayout;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONObject;

import com.bbk.watch.store.common.ElkLog;

import com.bbk.watch.store.common.ResponseUtils;

import com.bbk.watch.store.common.ResultBeanFactory;

@Plugin(name = "SampleLayout", category = "Core", elementType = "layout", printObject = true)

public class SampleLayout extends AbstractStringLayout {

/**

*

*/

private static final long serialVersionUID = 1L;

protected SampleLayout(boolean locationInfo, boolean properties, boolean complete,

Charset charset) {

super(charset);

}

@PluginFactory

public static SampleLayout createLayout(@PluginAttribute("locationInfo") boolean locationInfo,

@PluginAttribute("properties") boolean properties,

@PluginAttribute("complete") boolean complete,

@PluginAttribute(value = "charset", defaultString = "UTF-8") Charset charset) {

return new SampleLayout(locationInfo, properties, complete, charset);

}

@Override

public String toSerializable(LogEvent loggingEvent) {

if (loggingEvent.getMessage().getParameters() == null || loggingEvent.getMessage().getParameters().length == 0) {

return String.format("[%s] [%s] %s", "elk",

ResponseUtils.formatDate(new Date()), "不能解析的日志类型" + "\n");

}

StringBuilder exceptionBuiler = new StringBuilder();

Object object = loggingEvent.getMessage().getParameters()[0];

// if

// (DaLog.class.isAssignableFrom(loggingEvent.getMessage().getClass()))

// {

// return StringUtils.EMPTY;

// }

JSONObject logstashEvent = new JSONObject();

if (loggingEvent.getThrown() != null) {

final Throwable throwableInformation = loggingEvent.getThrown();

try {

Writer w = new StringWriter();

throwableInformation.printStackTrace(new PrintWriter(w));

exceptionBuiler.append(w.toString());

} catch (Exception e) {

}

} else if ("ERROR".equals(loggingEvent.getLevel().toString())) {

if (object instanceof Exception) {

Exception exception = (Exception) object;

String stackTrace = ExceptionUtils.getFullStackTrace(exception);

exceptionBuiler.append(stackTrace);

}

}

if (loggingEvent.isIncludeLocation()) {

StackTraceElement stackTraceElement = loggingEvent.getSource();

logstashEvent.put("exceptionName",

String.format("%s %s %s", stackTraceElement.getClassName(), stackTraceElement.getMethodName(), stackTraceElement.getLineNumber()));

}

logstashEvent.put("exceptionLevel", loggingEvent.getLevel().toString());

if (String.class.isAssignableFrom(object.getClass())) {

exceptionBuiler.append(object);

} else if (ElkLog.class.isAssignableFrom(object.getClass())) {

ElkLog elkLog = (ElkLog) object;

exceptionBuiler.append(elkLog.getException());

logstashEvent.put("code", elkLog.getCode());

logstashEvent.put("desc", elkLog.getDesc());

} else if (Exception.class.isAssignableFrom(object.getClass())) {

Exception exception = (Exception) object;

exceptionBuiler.append(ExceptionUtils.getFullStackTrace(exception));

logstashEvent.put("code", ResultBeanFactory.FAIL_CODE);

} else {

}

logstashEvent.put("exception", exceptionBuiler.toString());

return String.format("[%s] [%s] %s", "elk",

ResponseUtils.formatDate(new Date()), JSON.toJSONString(logstashEvent) + "\n");

}

}

4、去掉web.xml  log4j1.x相关配置，这里tomcat启动日志不会输出到文件，如果需要可以参考官网http://logging.apache.org/log4j/2.x/manual/webapp.html，没对这一部分进行研究。