log4j使用例子
目录结构:
D:\code\kongee\log4jtest>tree
卷 软件 的文件夹 PATH 列表
卷序列号为 000D-CD8E
D:.
├─.settings
├─bin
│ └─com
│ └─laolang
│ ├─cal
│ ├─hello
│ └─say
├─lib
├─log
└─src
└─com
└─laolang
├─cal
├─hello
└─say
D:\code\kongee\log4jtest>tree /f
卷 软件 的文件夹 PATH 列表
卷序列号为 000D-CD8E
D:.
│ .classpath
│ .project
│ build.properties
│ build.xml
│
├─.settings
│ org.eclipse.core.resources.prefs
│ org.eclipse.jdt.core.prefs
│
├─bin
│ │ log4j.properties
│ │
│ └─com
│ └─laolang
│ ├─cal
│ │ Cal.class
│ │
│ ├─hello
│ │ HelloWorld.class
│ │
│ └─say
│ Hello.class
│
├─lib
│ hamcrest-core-1.3.jar
│ junit-4.11.jar
│ log4j-1.2.17.jar
│
├─log
│ say.log
│ say.log.2015-11-08
│ say.log.2015-11-09
│ say.log.2015-11-10
│
└─src
│ log4j.properties
│
└─com
└─laolang
├─cal
│ Cal.java
│
├─hello
│ HelloWorld.java
│
└─say
Hello.java
D:\code\kongee\log4jtest> 代码：
com.laolang.cal.Cal
package com.laolang.cal;
import org.apache.log4j.Logger;
public class Cal {
public int add( int a, int b ){
logger.debug("加运算");
logger.info("加运算");
logger.warn("加运算");
logger.error("加运算");
logger.fatal("加运算");
return a + b;
}
public int minus( int a, int b ){
return a - b;
}
public int mult( int a, int b ){
return a * b;
}
public int divide( int a , int b ){
return a / b;
}
//创建logger
public static final Logger logger = Logger.getLogger(Cal.class);
} com.laolang.say.Hello
package com.laolang.say;
import org.apache.log4j.Logger;
public class Hello {
public void syaHello() {
System.out.println("Hello World");
logger.debug("hello");
logger.info("hello");
logger.warn("hello");
logger.error("hello");
logger.fatal("hello");
}
private static final Logger logger = Logger.getLogger(Hello.class);
// 不建议使用
// private static final Logger logger = Logger.getLogger("hello");
} com.laolang.hello.HelloWorld
package com.laolang.hello;
import com.laolang.cal.Cal;
import com.laolang.say.Hello;
public class HelloWorld {
public static void main(String[] args) {
String url = HelloWorld.class.getClassLoader().getResource("").getPath();
System.out.println("url:" + url);
if (-1 != url.lastIndexOf("build/classes/")) {
url = url.replace("build/classes/", "log");
}
if (-1 != url.lastIndexOf("bin/")) {
url = url.replace("bin/", "log");
}
System.out.println("url:" + url);
System.setProperty("log_dir", url);
Cal cal = new Cal();
cal.add(1, 3);
Hello hello = new Hello();
hello.syaHello();
}
} log4j.properties
log4j.appender.stout=org.apache.log4j.ConsoleAppender
log4j.appender.stout.layout=org.apache.log4j.PatternLayout
log4j.appender.stout.layout.ConversionPattern=[%p](%l)--->%m(%d)%n
log4j.rootLogger=DEBUG, stout
#log4j.appender.fout=org.apache.log4j.FileAppender
log4j.appender.fout=org.apache.log4j.DailyRollingFileAppender
log4j.appender.fout.datePattern='.'yyyy-MM-dd
#绝对路径名，不建议使用
#log4j.appender.fout.file=d:/hello.log
log4j.appender.fout.file=${log_dir}/say.log
log4j.appender.fout.layout=org.apache.log4j.PatternLayout
log4j.appender.fout.layout.ConversionPattern=[%p](%l)---->%m(%d)%n
# 通过名称访问，不建议使用
#log4j.logger.hello=DEBUG, fout
log4j.logger.com.laolang.say=DEBUG, fout ant
build.properties
Main-class=com.laolang.hello.HelloWorldbuild.xml
<?xml version="1.0" encoding="UTF-8"?>
<project>
<!--
fileset可以设定一组文件集来进行操作，dir指明文件集要进行选择的路径，
通过id可以指定这个文件的名称，在使用的时候进行直接的引入
include和exclude可以设定包含返回和排除范围**/*.*所有目录中的所有文件
-->
<fileset id="src.path" dir="src">
<include name="**/*.*" />
<!--<exclude name="**/*.java"/>-->
</fileset>
<!--使用属性定义相应的路径时，一定使用location而不要使用value-->
<property name="build.dir" location="build" />
<property name="build.classes" location="${build.dir}/classes" />
<property name="build.src" location="${build.dir}/src" />
<property name="src.dir" location="src" />
<property name="lib.dir" location="lib" />
<!--
打包、运行的相关信息
-->
<property file="build.properties">
</property>
<path id="compile-path">
<fileset dir="${lib.dir}" includes="*.jar">
</fileset>
</path>
<target name="init" description="创建必要的文件夹">
<mkdir dir="${build.dir}" />
<mkdir dir="${build.src}" />
<mkdir dir="${build.classes}" />
<echo message="初始化完成！" />
</target>
<target name="copySrc" depends="init" description="复制文件">
<copy todir="build/src">
<fileset refid="src.path">
</fileset>
</copy>
<echo message="复制文件完成！" />
</target>
<target name="compile" depends="copySrc" description="编译">
<javac destdir="build/classes" srcdir="src" includeantruntime="false" classpathref="compile-path" debug="true">
<!--给编译器指定编码，防止出现："警告： 编码 GBK 的不可映射字符"-->
<compilerarg line="-encoding UTF-8 " />
</javac>
<copy todir="${build.classes}">
<fileset dir="${src.dir}">
<include name="**/*.properties" />
</fileset>
</copy>
<echo message="编译完成！" />
</target>
<target name="execute" depends="compile" description="运行">
<echo>基于类路径的classname来完成执行</echo>
<java classname="${Main-class}" classpath="${build.classes}" fork="true" classpathref="compile-path">
</java>
</target>
<target name="clean" description="清理">
<delete dir="${build.dir}" />
</target>
</project> 运行结果：
D:\code\kongee\log4jtest>type log\say.log
[DEBUG](com.laolang.say.Hello.syaHello(Hello.java:10))---->hello(2015-11-08 21:34:50,932)
[INFO](com.laolang.say.Hello.syaHello(Hello.java:11))---->hello(2015-11-08 21:34:50,944)
[WARN](com.laolang.say.Hello.syaHello(Hello.java:12))---->hello(2015-11-08 21:34:50,945)
[ERROR](com.laolang.say.Hello.syaHello(Hello.java:13))---->hello(2015-11-08 21:34:50,946)
[FATAL](com.laolang.say.Hello.syaHello(Hello.java:14))---->hello(2015-11-08 21:34:50,947)
D:\code\kongee\log4jtest>ant execute
Buildfile: D:\code\kongee\log4jtest\build.xml
init:
[echo] 初始化完成！
copySrc:
[echo] 复制文件完成！
compile:
[echo] 编译完成！
execute:
[echo] 基于类路径的classname来完成执行
[java] url:/D:/code/kongee/log4jtest/build/classes/
[java] url:/D:/code/kongee/log4jtest/log
[java] [DEBUG](com.laolang.cal.Cal.add(Cal.java:8))--->加运算(2015-11-08 21:35:24,595)
[java] [INFO](com.laolang.cal.Cal.add(Cal.java:9))--->加运算(2015-11-08 21:35:24,603)
[java] [WARN](com.laolang.cal.Cal.add(Cal.java:10))--->加运算(2015-11-08 21:35:24,604)
[java] [ERROR](com.laolang.cal.Cal.add(Cal.java:11))--->加运算(2015-11-08 21:35:24,605)
[java] [FATAL](com.laolang.cal.Cal.add(Cal.java:12))--->加运算(2015-11-08 21:35:24,605)
[java] Hello World
[java] [DEBUG](com.laolang.say.Hello.syaHello(Hello.java:10))--->hello(2015-11-08 21:35:24,608)
[java] [INFO](com.laolang.say.Hello.syaHello(Hello.java:11))--->hello(2015-11-08 21:35:24,618)
[java] [WARN](com.laolang.say.Hello.syaHello(Hello.java:12))--->hello(2015-11-08 21:35:24,618)
[java] [ERROR](com.laolang.say.Hello.syaHello(Hello.java:13))--->hello(2015-11-08 21:35:24,619)
[java] [FATAL](com.laolang.say.Hello.syaHello(Hello.java:14))--->hello(2015-11-08 21:35:24,620)
BUILD SUCCESSFUL
Total time: 3 seconds
D:\code\kongee\log4jtest>type log\say.log
[DEBUG](com.laolang.say.Hello.syaHello(Hello.java:10))---->hello(2015-11-08 21:34:50,932)
[INFO](com.laolang.say.Hello.syaHello(Hello.java:11))---->hello(2015-11-08 21:34:50,944)
[WARN](com.laolang.say.Hello.syaHello(Hello.java:12))---->hello(2015-11-08 21:34:50,945)
[ERROR](com.laolang.say.Hello.syaHello(Hello.java:13))---->hello(2015-11-08 21:34:50,946)
[FATAL](com.laolang.say.Hello.syaHello(Hello.java:14))---->hello(2015-11-08 21:34:50,947)
[DEBUG](com.laolang.say.Hello.syaHello(Hello.java:10))---->hello(2015-11-08 21:35:24,608)
[INFO](com.laolang.say.Hello.syaHello(Hello.java:11))---->hello(2015-11-08 21:35:24,618)
[WARN](com.laolang.say.Hello.syaHello(Hello.java:12))---->hello(2015-11-08 21:35:24,618)
[ERROR](com.laolang.say.Hello.syaHello(Hello.java:13))---->hello(2015-11-08 21:35:24,619)
[FATAL](com.laolang.say.Hello.syaHello(Hello.java:14))---->hello(2015-11-08 21:35:24,620)
D:\code\kongee\log4jtest>
如果修改系统时间的话，会在log目录下有一个相对应的log文件，这里不再演示
记录：
使用log4j的步骤：
1、创建logger
public static final Logger logger = Logger.getLogger(ClassName.class);2、编写日志
logger.debug("hello");
logger.info("hello");
logger.warn("hello");
logger.error("hello");
logger.fatal("hello"); 3、编写配置文件
3.1创建apender
log4j.appender.fout=org.apache.log4j.DailyRollingFileAppender log4j.appender.fout.datePattern='.'yyyy-MM-dd3.2设置layout
log4j.appender.fout.file=${log_dir}/say.log
log4j.appender.fout.layout=org.apache.log4j.PatternLayout 3.3设置输出格式
log4j.appender.fout.layout.ConversionPattern=[%p](%l)---->%m(%d)%n4、设置日志输出级别
log4j.logger.com.laolang.say=DEBUG, fout