058 kafka与log4j集成

1.首先在resources下面写log4j.properties

　　主要是因为kafka.producer.KafkaLog4jAppender类的存在。

 log4j.rootLogger=INFO,console,KAFKA

 ## appender KAFKA
 log4j.appender.KAFKA=kafka.producer.KafkaLog4jAppender
 ## topic must exitss
 log4j.appender.KAFKA.topic=beifeng
 log4j.appender.KAFKA.brokerList=linux-hadoop01.ibeifeng.com:9092,linux-hadoop01.ibeifeng.com:9093
 log4j.appender.KAFKA.compressionType=none
 log4j.appender.KAFKA.syncSend=false
 log4j.appender.KAFKA.layout=org.apache.log4j.PatternLayout
 log4j.appender.KAFKA.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L %% - %m

 ## appender console
 log4j.appender.console=org.apache.log4j.ConsoleAppender
 log4j.appender.console.layout=org.apache.log4j.PatternLayout
 log4j.appender.console.layout.ConversionPattern=%d (%t) [%p - %l] %m%n

2.测试类

 package com.jun.it;

 import org.apache.log4j.Logger;

 public class KafkaLoggerTest {
     public static final Logger logger = Logger.getLogger(KafkaLoggerTest.class);

     public static void main(String[] args) throws InterruptedException {
         for(int i=0;i<50;i++) {
             logger.debug("debug_" + i);
             logger.info("info_" + i);
             logger.warn("warn_" + i);
             logger.error("error_" + i);
             logger.fatal("fatal_" + i);
         }

         // 如果不sleep，会出现什么情况？怎么解决
         Thread.sleep(10000);
     }
 }

3.开启9092端口的消费者服务

　　bin/kafka-console-consumer.sh --topic beifeng --zookeeper linux-hadoop01.ibeifeng.com:2181/kafka

4.效果