在idea下使用java将Log4j日志实时写入Kafka（Kafka实时日志写入）
本篇文章主要介绍在windows下使用idea新建web项目将Log4j日志实时写入Kafka。
简要步骤：
①、新建web项目
②、启动zookeeper
③、启动Kafka
④、创建topic
⑤、启动 Kafka 消费者，运行项目，观察Kafka 消费者的控制台
详细步骤：
一、新建web项目
代码如下：
package com.demo;
import org.apache.kafka.clients.CommonClientConfigs;
import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.clients.producer.Producer;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.clients.producer.ProducerRecord;
import org.apache.kafka.clients.producer.RecordMetadata;
import org.apache.kafka.common.config.ConfigException;
import org.apache.kafka.common.config.SslConfigs;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;
import java.util.Date;
import java.util.Properties;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
/**
* A log4j appender that produces log messages to Kafka
*/
public class KafkaLog4jAppender extends AppenderSkeleton {
private static final String BOOTSTRAP_SERVERS_CONFIG = ProducerConfig.BOOTSTRAP_SERVERS_CONFIG;
private static final String COMPRESSION_TYPE_CONFIG = ProducerConfig.COMPRESSION_TYPE_CONFIG;
private static final String ACKS_CONFIG = ProducerConfig.ACKS_CONFIG;
private static final String RETRIES_CONFIG = ProducerConfig.RETRIES_CONFIG;
private static final String KEY_SERIALIZER_CLASS_CONFIG = ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG;
private static final String VALUE_SERIALIZER_CLASS_CONFIG = ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG;
private static final String SECURITY_PROTOCOL = CommonClientConfigs.SECURITY_PROTOCOL_CONFIG;
private static final String SSL_TRUSTSTORE_LOCATION = SslConfigs.SSL_TRUSTSTORE_LOCATION_CONFIG;
private static final String SSL_TRUSTSTORE_PASSWORD = SslConfigs.SSL_TRUSTSTORE_PASSWORD_CONFIG;
private static final String SSL_KEYSTORE_TYPE = SslConfigs.SSL_KEYSTORE_TYPE_CONFIG;
private static final String SSL_KEYSTORE_LOCATION = SslConfigs.SSL_KEYSTORE_LOCATION_CONFIG;
private static final String SSL_KEYSTORE_PASSWORD = SslConfigs.SSL_KEYSTORE_PASSWORD_CONFIG;
private String brokerList = null;
private String topic = null;
private String compressionType = null;
private String securityProtocol = null;
private String sslTruststoreLocation = null;
private String sslTruststorePassword = null;
private String sslKeystoreType = null;
private String sslKeystoreLocation = null;
private String sslKeystorePassword = null;
private int retries = 0;
private int requiredNumAcks = Integer.MAX_VALUE;
private boolean syncSend = false;
private Producer producer = null;
public Producer getProducer() {
return producer;
}
public String getBrokerList() {
return brokerList;
}
public void setBrokerList(String brokerList) {
this.brokerList = brokerList;
}
public int getRequiredNumAcks() {
return requiredNumAcks;
}
public void setRequiredNumAcks(int requiredNumAcks) {
this.requiredNumAcks = requiredNumAcks;
}
public int getRetries() {
return retries;
}
public void setRetries(int retries) {
this.retries = retries;
}
public String getCompressionType() {
return compressionType;
}
public void setCompressionType(String compressionType) {
this.compressionType = compressionType;
}
public String getTopic() {
return topic;
}
public void setTopic(String topic) {
this.topic = topic;
}
public boolean getSyncSend() {
return syncSend;
}
public void setSyncSend(boolean syncSend) {
this.syncSend = syncSend;
}
public String getSslTruststorePassword() {
return sslTruststorePassword;
}
public String getSslTruststoreLocation() {
return sslTruststoreLocation;
}
public String getSecurityProtocol() {
return securityProtocol;
}
public void setSecurityProtocol(String securityProtocol) {
this.securityProtocol = securityProtocol;
}
public void setSslTruststoreLocation(String sslTruststoreLocation) {
this.sslTruststoreLocation = sslTruststoreLocation;
}
public void setSslTruststorePassword(String sslTruststorePassword) {
this.sslTruststorePassword = sslTruststorePassword;
}
public void setSslKeystorePassword(String sslKeystorePassword) {
this.sslKeystorePassword = sslKeystorePassword;
}
public void setSslKeystoreType(String sslKeystoreType) {
this.sslKeystoreType = sslKeystoreType;
}
public void setSslKeystoreLocation(String sslKeystoreLocation) {
this.sslKeystoreLocation = sslKeystoreLocation;
}
public String getSslKeystoreLocation() {
return sslKeystoreLocation;
}
public String getSslKeystoreType() {
return sslKeystoreType;
}
public String getSslKeystorePassword() {
return sslKeystorePassword;
}
@Override
public void activateOptions() {
// check for config parameter validity
Properties props = new Properties();
if (brokerList != null)
props.put(BOOTSTRAP_SERVERS_CONFIG, brokerList);
if (props.isEmpty())
throw new ConfigException("The bootstrap servers property should be specified");
if (topic == null)
throw new ConfigException("Topic must be specified by the Kafka log4j appender");
if (compressionType != null)
props.put(COMPRESSION_TYPE_CONFIG, compressionType);
if (requiredNumAcks != Integer.MAX_VALUE)
props.put(ACKS_CONFIG, Integer.toString(requiredNumAcks));
if (retries > 0)
props.put(RETRIES_CONFIG, retries);
if (securityProtocol != null && sslTruststoreLocation != null &&
sslTruststorePassword != null) {
props.put(SECURITY_PROTOCOL, securityProtocol);
props.put(SSL_TRUSTSTORE_LOCATION, sslTruststoreLocation);
props.put(SSL_TRUSTSTORE_PASSWORD, sslTruststorePassword);
if (sslKeystoreType != null && sslKeystoreLocation != null &&
sslKeystorePassword != null) {
props.put(SSL_KEYSTORE_TYPE, sslKeystoreType);
props.put(SSL_KEYSTORE_LOCATION, sslKeystoreLocation);
props.put(SSL_KEYSTORE_PASSWORD, sslKeystorePassword);
}
}
props.put(KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.ByteArraySerializer");
props.put(VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.ByteArraySerializer");
this.producer = getKafkaProducer(props);
LogLog.debug("Kafka producer connected to " + brokerList);
LogLog.debug("Logging for topic: " + topic);
}
protected Producer getKafkaProducer(Properties props) {
return new KafkaProducer(props);
}
@Override
protected void append(LoggingEvent event) {
String message = subAppend(event);
LogLog.debug("[" + new Date(event.getTimeStamp()) + "]" + message);
Future response = producer.send(new ProducerRecord(topic, message.getBytes()));
if (syncSend) {
try {
response.get();
} catch (InterruptedException ex) {
throw new RuntimeException(ex);
} catch (ExecutionException ex) {
throw new RuntimeException(ex);
}
}
}
private String subAppend(LoggingEvent event) {
return (this.layout == null) ? event.getRenderedMessage() : this.layout.format(event);
}
public void close() {
if (!this.closed) {
this.closed = true;
producer.close();
}
}
public boolean requiresLayout() {
return true;
}
} package com.demo;
import org.apache.log4j.Logger;
/**
* 模拟日志产生
* Created by zhoujh on 2018/8/9.
*/
public class KafkaLog4jApp {
private static Logger logger = Logger.getLogger(KafkaLog4jApp.class.getName());
public static void main(String[] args) throws Exception {
int index = 0;
while(true) {
Thread.sleep(1000);
logger.info("value is: " + index++);
}
}
}
log4j.properties
log4j.rootLogger=INFO,stdout,kafka
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.target = System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c] [%p] - %m%n
log4j.appender.kafka = com.demo.KafkaLog4jAppender
log4j.appender.kafka.topic = log4jtest
log4j.appender.kafka.brokerList=node1:9092
log4j.appender.kafka.layout=org.apache.log4j.PatternLayout
log4j.appender.kafka.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} [%t] [%c] [%p] - %m%n
完整pom.cml
4.0.0
com.demo
log-kafka-flume
1.0-SNAPSHOT
org.apache.kafka
kafka_2.11
0.11.0.0
log4j
log4j
1.2.16
org.slf4j
slf4j-log4j12
1.7.21
test
二、启动zookeeper
zkServer.sh start
三、启动Kafka
进入kafka bin目录
bin/kafka-server-start.sh config/server.properties
四、创建topic
./kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic log4jtest
./kafka-topics.sh --create --zookeeper localhost:2181 --replication-factor 1 --partitions 1 --topic log4jtest
五、启动 Kafka 消费者，运行项目，观察Kafka 消费者的控制台
./kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic log4jtest控制台打印
[hadoop@node1 bin]$ ./kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic log4jtest
2018-08-09 17:35:13,271 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 0
2018-08-09 17:35:14,406 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 1
2018-08-09 17:35:15,406 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 2
2018-08-09 17:35:16,406 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 3
2018-08-09 17:35:17,406 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 4
2018-08-09 17:35:18,407 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 5
2018-08-09 17:35:19,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 6
2018-08-09 17:35:20,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 7
2018-08-09 17:35:21,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 8
2018-08-09 17:35:22,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 9
2018-08-09 17:35:23,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 10
2018-08-09 17:35:24,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 11
2018-08-09 17:35:25,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 12
2018-08-09 17:35:26,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 13
2018-08-09 17:35:27,497 [main] [com.demo.KafkaLog4jApp] [INFO] - value is: 14程序截图：
