Log4j之LogFactor5简介

http://kin111.blog.51cto.com/738881/158612
Log4j中的LogFactor5是Log4j的Appender的一个实现。LogFactor5可以图形的形式表示log信息。并且可以对表示的Log信息进行筛选。适合于使用Log4j时查看log的调试。本文简单介绍LogFactor5的使用方法。
本文示例使用的Log4j版本为：apache-log4j-1.2.15

1。运行LogFactor5的简单方法：
在有log4j-1.2.15.jar文件的目录下从命令行执行：
java -classpath .;log4j-1.2.15.jar org.apache.log4j.lf5.StartLogFactor5即可

表示出一个GUI图形界面。如下图
点击查看原始大小图片

从File菜单选OPEN菜单，从文件选择对话框中选择\apache-log4j-1.2.15\examples\lf5\OpeningLogFiles\sample.log文件后，GUI图形界面内容变化，即可表示出log内容。如下图
点击查看原始大小图片

2。生成可以被LogFactor5GUI图形界面表示的Log方法。
这需要使用Class LF5Appender。这个Class位于org.apache.log4j.lf5包中。
有很多方法可以调用到LF5Appender。
最简单的一种方法如下：
使用DefaultLF5Configurator.configure();
示例代码：

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Java代码

* 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 examples.lf5.InitUsingDefaultConfigurator;

import org.apache.log4j.Logger;

import org.apache.log4j.NDC;

import org.apache.log4j.lf5.DefaultLF5Configurator;

import java.io.IOException;

/**

* This class is a simple example of how to configure the LogFactor5

* logging window using the DefaultLF5Configurator.

* The DefaultLF5Configurator uses a default configuration file stored

* in the log4j.jar in order to provide a default configuration for

* the LF5Appender.

* @author Brent Sprecher

// Contributed by ThoughtWorks Inc.

public class InitUsingDefaultConfigurator {

//--------------------------------------------------------------------------

// Constants:

//--------------------------------------------------------------------------

// Protected Variables:

//--------------------------------------------------------------------------

// Private Variables:

//--------------------------------------------------------------------------

private static Logger logger =

Logger.getLogger(InitUsingDefaultConfigurator.class);

//--------------------------------------------------------------------------

// Constructors:

//--------------------------------------------------------------------------

// Public Methods:

//--------------------------------------------------------------------------

public static void main(String[] args) throws IOException {

// Configure the LF5Appender using the DefaultLF5Configurator. This

// will add the LF5Appender to the root of the Category tree.

DefaultLF5Configurator.configure();

// Add an NDC to demonstrate how NDC information is output.

NDC.push("#23856");

// Log some information.

for (int i = 0; i < 10; i++) {

logger.debug("Hello, my name is Homer Simpson.");

logger.info("Mmmmmm .... Chocolate.");

logger.warn("Mmm...forbidden donut.");

}

// Clean up NDC

NDC.pop();

NDC.remove();

NDC.push("Another NDC");

// Log some information.

logger.fatal("Hello, my name is Bart Simpson.");

logger.error("Hi diddly ho good neighbour.");

// Clean up NDC

NDC.pop();

NDC.remove();

// Call methods on both classes.

InitUsingDefaultConfigurator.foo();

InnerInitUsingDefaultConfigurator.foo();

logger.info("Exiting InitUsingDefaultConfigurator.");

}

public static void foo() {

logger.debug("Entered foo in InitUsingDefaultConfigurator class");

NDC.push("#123456");

logger.debug("Hello, my name is Marge Simpson.");

logger.info("D'oh!! A deer! A female deer.");

// Clean up NDC

NDC.pop();

NDC.remove();

}

//--------------------------------------------------------------------------

// Protected Methods:

//--------------------------------------------------------------------------

// Private Methods:

//--------------------------------------------------------------------------

// Nested Top-Level Classes or Interfaces:

//--------------------------------------------------------------------------

public static class InnerInitUsingDefaultConfigurator {

static Logger logger =

Logger.getLogger(InnerInitUsingDefaultConfigurator.class.getName());

static void foo() throws IOException {

// Configure the LF5Appender again. You can call

// DefaultLF5Configurator.configure() as often as you want

// without unexpected behavior.

DefaultLF5Configurator.configure();

logger.info("Entered foo in InnerInitUsingDefaultConfigurator class.");

}

编译：
javac -classpath .;log4j-1.2.15.jar InitUsingDefaultConfigurator.java
得到InitUsingDefaultConfigurator$InnerInitUsingDefaultConfigurator.class
和InitUsingDefaultConfigurator.class

执行：
java -classpath .;log4j-1.2.15.jar examples.lf5.InitUsingDefaultConfigurator.InitUsingDefaultConfigurator

会启动LogFactor5的图形界面，并把输出Log的内容表示到界面中。如下图：
点击查看原始大小图片

3，LogFactor5的Log的格式
LogFactor5的Log的格式是固定的。如下示例
中括号的规定的标记。

[slf5s.start]26 Jul 2001 15:54:44,673[slf5s.DATE]
DEBUG[slf5s.PRIORITY]
[slf5s.NDC]
main[slf5s.THREAD]
examples.InitUsingMultipleAppenders.InitUsingMultipleAppenders[slf5s.CATEGORY]
examples.InitUsingMultipleAppenders.InitUsingMultipleAppenders.main(InitUsingMultipleAppenders.java:102)[slf5s.LOCATION]
Hello, my name is Homer Simpson.[slf5s.MESSAGE]

4，LogFactor5的package简介

org.apache.log4j.lf5      主要是appender,configurator,level,封装的log记录类,和启动类等等.
org.apache.log4j.lf5.util      主要是LogFactor5的实用类,读资源,处理流,swing的一些共通处理
org.apache.log4j.lf5.viewer      主要是gui的主窗口,各个dialog,表示log用的table,tablemodel等类
org.apache.log4j.lf5.viewer.categoryexplorer      主要是主窗口左边的category流览tree表示swing组件的支持的类
org.apache.log4j.lf5.viewer.configure 主要是处理最近打开文件历史,配置保存读取类

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