spring整合日志框架log4j

log4j：是apche提供的一个非常优秀日志管理框架，提供了各种的日志输出和存储技术的方式，对于使用这是需要简单的调用即可，
spring整合log4j

导入maven依赖：

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xingxue</groupId>
    <artifactId>SpringAOP</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>SpringAOP Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aspects</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>4.3.8.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>SpringAOP</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven 
                defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.7.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.20.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

配置log4j的配置文件，其他框架都是xml做配置文件，log4
j可以是用properties作为配置文件

在代码根目录下面新建log4j.properties, 注意名字不能乱写。

# +======================================================================+#
log4j.rootLogger=${log4j.log.level},${log4j.log.target}
log4j.addivity.org.apache=true
# +======================================================================+#
# | [target] - Console
# +----------------------------------------------------------------------+#
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=${log4j.log.level}
log4j.appender.CONSOLE.Encoding=${log4j.log.encoding}
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=${log4j.log.layout}
log4j.appender.CONSOLE.layout.ConversionPattern=${log4j.log.layout.pattern}
# +======================================================================+#
# | [target] - FILE
# +----------------------------------------------------------------------+#
log4j.appender.FILE=org.apache.log4j.RollingFileAppender
log4j.appender.FILE.Threshold=${log4j.log.level}
log4j.appender.FILE.Encoding=${log4j.log.encoding}
log4j.appender.FILE.File=${log4j.log.dir}/runtime.log
log4j.appender.FILE.Append=true
log4j.appender.FILE.MaxFileSize=2048KB
log4j.appender.FILE.MaxBackupIndex=10
log4j.appender.FILE.layout=${log4j.log.layout}
log4j.appender.FILE.layout.ConversionPattern=${log4j.log.layout.pattern}

# +======================================================================+#
# | log4j config
# +----------------------------------------------------------------------+#
log4j.log.dir=logs/
#log4j.log.level=ALL,TRACE,DEBUG,INFO,WARN,ERROR,FATAL,OFF
log4j.log.level=DEBUG
#log4j.log.target=CONSOLE,FILE,DATABASE,EMAIL,SOCKET
log4j.log.target=CONSOLE,FILE
log4j.log.encoding=UTF-8
log4j.log.layout=org.apache.log4j.PatternLayout
log4j.log.layout.pattern=[%d %r] [%-5p] [%t] [%l] [%m]%n
# +======================================================================+#

被整合了。我们在使用spring的时候就又很多的日志信息。
log4j日志详解：

#日志输出的地址： 可以任意配置， logs/存储在当前项目中   e:/logs
log4j.log.dir=logs/ 
#日志的等级：  
#log4j.log.level=ALL,TRACE,DEBUG,INFO,WARN,ERROR,FATAL,OFF
log4j.log.level=DEBUG
#log4j.log.target=CONSOLE,FILE,DATABASE,EMAIL,SOCKET
log4j.log.target=CONSOLE,FILE
log4j.log.encoding=UTF-8
log4j.log.layout=org.apache.log4j.PatternLayout
log4j.log.layout.pattern=[%d %r] [%-5p] [%t] [%l] [%m]%n

日志等等级：指的是我们定义日志的级别， DEBUG是最详细的， INFO表示提示信息， WARN：表示警告信息， ERROR：记录错误信息，这里这几个等级知识一个对应关系，在我们使用的时候，可以根据日志的重要级别，采用不同的级别记录，这样我们的日志就可以分类管理，
比如info值打印正常的信息
debug打印调试的信息
warn打印异常信息等，用户可以自行根据级别定义。 log4j只是负责开发这几类接口给我们使用。

使用log4j 记录日志信息。

import org.apache.commons.logging.Log;
import org.apache.commons.logging.impl.Log4JLogger;
import org.springframework.stereotype.Service;
import org.apache.log4j.Logger;

import com.xingxue.log.MyLog;

@Service("userService")
public class UserService {

private Logger logger = Logger.getLogger(UserService.class);
public void showInfo(int i) {
//开启事务   打印日志
System.out.println("22222222222222");
//提交回滚事务， 打印日志
try {
int num = 9/0;

} catch (Exception e) {
logger.info("取钱出现异常：传进参数["+i+"]" + e.getMessage());
}
logger.info("取钱正常！");

}
}

spring整合日志框架log4j

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