package com.turtle.log;

import com.turtle.utils.ExceptionOutputStreamUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.text.SimpleDateFormat;
import java.util.Date;

public class LogTest {

    private final static Logger logger = LoggerFactory.getLogger(LogTest.class);

    public static void main(String[] args) {
        logger.info("programer processing......");
        try{
            // 会产生除以0的异常信息
            System.out.println(1/0);
        }catch (Exception e){
            // 将异常信息打印到日志文件中去
            String exception = ExceptionOutputStreamUtil.getTrace(e);
            // 输出日志文件
            logger.error("Programer error:"+ exception+"\t"+"【"+new SimpleDateFormat("yyyy-MM-dd/HH.mm.ss").format(new Date())+"】");
        }
        logger.debug("start Debug detail......");
    }
}

package com.turtle.log1;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LogTest {

    private final  static Logger logger = LoggerFactory.getLogger(LogTest.class);

    public static void main(String [] args){

        logger.info("com.turtle.log1.LogTest的Info级别日志");
        logger.debug("com.turtle.log1.LogTest的Debug级别日志");

    }
}

package com.turtle.log2;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LogTest {

    private final  static Logger logger = LoggerFactory.getLogger(LogTest.class);

    public static void main(String [] args){

        logger.info("com.turtle.log2.LogTest的Info级别日志");
        logger.debug("com.turtle.log2.LogTest的Debug级别日志");

    }
}

package com.turtle.utils;

import java.io.PrintWriter;
import java.io.StringWriter;

public class ExceptionOutputStreamUtil {

    /**
     * 将传入的具体错误信息转换为输出流进行输出
     * @param t
     * @return
     */
    public static String getTrace(Throwable t) {
        StringWriter stringWriter= new StringWriter();
        PrintWriter writer= new PrintWriter(stringWriter);
        t.printStackTrace(writer);
        writer.close();
        StringBuffer buffer= stringWriter.getBuffer();
        return buffer.toString();
    }
}

### set log levels ###
log4j.rootLogger = DEBUG,stdout,D,E

# 配置日志信息输出目的地
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
# Target是输出目的地的目标
log4j.appender.stdout.Target = System.out
# 指定日志消息的输出最低层次
log4j.appender.stdout.Threshold = INFO
# 定义名为stdout的输出端的layout类型
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
# 如果使用pattern布局就要指定的打印信息的具体格式ConversionPattern
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss} %l%m%n


# 名字为D的对应日志处理
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
# File是输出目的地的文件名
log4j.appender.D.File = LOG//app_debug.log
#false:默认值是true,即将消息增加到指定文件中，false指将消息覆盖指定的文件内容
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG
log4j.appender.D.layout = org.apache.log4j.TTCCLayout

# 名字为E的对应日志处理
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File = LOG//app_error.log
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n



log4j.logger.com.turtle.log1 = DEBUG,A1
log4j.logger.com.turtle.log2 = ERROR,A2

log4j.appender.A1 = org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.File = LOG//A1_app_debug.log
log4j.appender.A1.Append = true
log4j.appender.A1.Threshold = DEBUG
log4j.appender.A1.layout = org.apache.log4j.TTCCLayout

log4j.appender.A2 = org.apache.log4j.DailyRollingFileAppender
log4j.appender.A2.File = LOG//A2_app_error.log
log4j.appender.A2.Append = true
log4j.appender.A2.Threshold = ERROR
log4j.appender.A2.layout = org.apache.log4j.TTCCLayout

<?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.turtle</groupId>
  <artifactId>log</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>log</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>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.25</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
    </dependency>

  </dependencies>

</project>