如果使用spring插件创建一个spring template project,它会默认带log4j,只要改下log4j的配置就可以使用了，如果自己创建的project,就要加载下log4f的包了，使用步骤如下
1.pom.xml加入log4j的依赖包
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<!-- Logging -->
<
dependency
>
<
groupId
>org.slf4j</
groupId
>
<
artifactId
>slf4j-api</
artifactId
>
<
version
>1.6.6</
version
>
</
dependency
>
<
dependency
>
<
groupId
>org.slf4j</
groupId
>
<
artifactId
>jcl-over-slf4j</
artifactId
>
<
version
>1.6.6</
version
>
<
scope
>runtime</
scope
>
</
dependency
>
<
dependency
>
<
groupId
>org.slf4j</
groupId
>
<
artifactId
>slf4j-log4j12</
artifactId
>
<
version
>1.6.6</
version
>
<
scope
>runtime</
scope
>
</
dependency
>
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2.在src/main/resources下创建log4j.xml
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<?
xml
version
=
"1.0"
encoding
=
"UTF-8"
?>
<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd">
<
log4j:configuration
xmlns:log4j
=
"http://jakarta.apache.org/log4j/"
>
<!-- [控制台STDOUT] -->
<
appender
name
=
"console"
class
=
"org.apache.log4j.ConsoleAppender"
>
<
param
name
=
"encoding"
value
=
"GBK"
/>
<
param
name
=
"target"
value
=
"System.out"
/>
<
layout
class
=
"org.apache.log4j.PatternLayout"
>
<
param
name
=
"ConversionPattern"
value
=
"%-5p %c{2} - %m%n"
/>
</
layout
>
</
appender
>
<!-- [公共Appender] -->
<
appender
name
=
"DEFAULT-APPENDER"
class
=
"org.apache.log4j.DailyRollingFileAppender"
>
<
param
name
=
"File"
value
=
"${webapp.root}/logs/common-default.log"
/>
<
param
name
=
"Append"
value
=
"true"
/>
<
param
name
=
"encoding"
value
=
"GBK"
/>
<
param
name
=
"DatePattern"
value
=
"'.'yyyy-MM-dd'.log'"
/>
<
layout
class
=
"org.apache.log4j.PatternLayout"
>
<
param
name
=
"ConversionPattern"
value
=
"%d %-5p %c{2} - %m%n"
/>
</
layout
>
</
appender
>
<!-- [错误日志APPENDER] -->
<
appender
name
=
"ERROR-APPENDER"
class
=
"org.apache.log4j.DailyRollingFileAppender"
>
<
param
name
=
"File"
value
=
"${webapp.root}/logs/common-error.log"
/>
<
param
name
=
"Append"
value
=
"true"
/>
<
param
name
=
"encoding"
value
=
"GBK"
/>
<
param
name
=
"threshold"
value
=
"error"
/>
<
param
name
=
"DatePattern"
value
=
"'.'yyyy-MM-dd'.log'"
/>
<
layout
class
=
"org.apache.log4j.PatternLayout"
>
<
param
name
=
"ConversionPattern"
value
=
"%d %-5p %c{2} - %m%n"
/>
</
layout
>
</
appender
>
<!-- [组件日志APPENDER] -->
<
appender
name
=
"COMPONENT-APPENDER"
class
=
"org.apache.log4j.DailyRollingFileAppender"
>
<
param
name
=
"File"
value
=
"${webapp.root}/logs/logistics-component.log"
/>
<
param
name
=
"Append"
value
=
"true"
/>
<
param
name
=
"encoding"
value
=
"GBK"
/>
<
param
name
=
"DatePattern"
value
=
"'.'yyyy-MM-dd'.log'"
/>
<
layout
class
=
"org.apache.log4j.PatternLayout"
>
<
param
name
=
"ConversionPattern"
value
=
"%d %-5p %c{2} - %m%n"
/>
</
layout
>
</
appender
>
<!-- [组件日志] -->
<
logger
name
=
"LOGISTICS-COMPONENT"
>
<
level
value
=
"${loggingLevel}"
/>
<
appender-ref
ref
=
"COMPONENT-APPENDER"
/>
<
appender-ref
ref
=
"ERROR-APPENDER"
/>
</
logger
>
<!-- Root Logger -->
<
root
>
<
level
value
=
"${rootLevel}"
></
level
>
<
appender-ref
ref
=
"DEFAULT-APPENDER"
/>
<
appender-ref
ref
=
"ERROR-APPENDER"
/>
</
root
>
</
log4j:configuration
>
|
og4j.xml中定义了4个appender,就是log输出的位置，一个是控制台，三个是文件，但有一个文件common-error.log是专用于收集特殊错误的文件，可以定义多个分别为不同的场景使用,log4j的相关定义如下：
（1）. 输出方式appender一般有5种：
org.apache.log4j.RollingFileAppender(滚动文件，自动记录最新日志)
org.apache.log4j.ConsoleAppender (控制台)
org.apache.log4j.FileAppender (文件)
org.apache.log4j.DailyRollingFileAppender (每天产生一个日志文件)
org.apache.log4j.WriterAppender (将日志信息以流格式发送到任意指定的地方)
（2）. 日记记录的优先级priority，优先级由高到低分为
OFF ,FATAL ,ERROR ,WARN ,INFO ,DEBUG ,ALL。
Log4j建议只使用FATAL ,ERROR ,WARN ,INFO ,DEBUG这五个级别。
（3）. 格式说明layout中的参数都以%开始，后面不同的参数代表不同的格式化信息（参数按字母表顺序列出）：
%c 输出所属类的全名，可在修改为 %d{Num} ,Num类名输出的维（如："org.apache.elathen.ClassName",%C{2}将输出elathen.ClassName）
%d 输出日志时间其格式为 %d{yyyy-MM-dd HH:mm:ss,SSS}，可指定格式 如 %d{HH:mm:ss}
%l 输出日志事件发生位置，包括类目名、发生线程，在代码中的行数
%n 换行符
%m 输出代码指定信息，如info(“message”),输出message
%p 输出优先级，即 FATAL ,ERROR 等
%r 输出从启动到显示该log信息所耗费的毫秒数
%t 输出产生该日志事件的线程名
3. web.xml中配置log4j
<!-- 配置加载log4j.xml文件路径 -->
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:config/log4j.xml</param-value>
</context-param>
<!-- 配置log4j.xml变量 -->
<context-param>
<param-name>rootLevel</param-name>
<param-value>DEBUG</param-value>
</context-param>
<context-param>
<param-name>loggingLevel</param-name>
<param-value>INFO</param-value>
</context-param>
<!-- 配置log4j.xml监听器 -->
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
4. 类使用log4j
（1）包引入
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
（2）日志常量定义
/** 组件日志 */
private static final Logger logger = LoggerFactory .getLogger(LoggerNames.LOGISTICS_COMPONENT);
（3）日志打印
logger.info("日志打印");
slf4j+Log4J
1.先在spring排除commons-logging.再引入4个包:桥接包jcl-over-slf4j,SLF4J API包slf4j-api,绑定到Log4J的包slf4j-log4j12,Log4J实现包log4j12.
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5
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8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
<
dependency
>
<
groupId
>org.slf4j</
groupId
>
<
artifactId
>jcl-over-slf4j</
artifactId
>
<
version
>1.7.7</
version
>
</
dependency
>
<
dependency
>
<
groupId
>org.slf4j</
groupId
>
<
artifactId
>slf4j-log4j12</
artifactId
>
<
version
>1.7.7</
version
>
</
dependency
>
<
dependency
>
<
groupId
>org.springframework</
groupId
>
<
artifactId
>spring-context</
artifactId
>
<
version
>${spring.version}</
version
>
<
exclusions
>
<
exclusion
>
<
groupId
>commons-logging</
groupId
>
<
artifactId
>commons-logging</
artifactId
>
</
exclusion
>
</
exclusions
>
</
dependency
>
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2.log4j配置
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log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{2}:%L - %m%n
log4j.logger.org.springframework.beans.factory=DEBUG
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3.代码用法:
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import
org.slf4j.Logger;
import
org.slf4j.LoggerFactory;
public
class
UserService {
final
Logger logger = LoggerFactory.getLogger(UserService.
class
);
public
boolean
save(){
logger.error(
"虽然{}喜欢我,但是我喜欢{}"
,
"A"
,
"B"
);
return
true
;
}
}
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