原文链接：http://www.sjsjw.com/kf_cloud/article/020376ABA013802.asp
目的
实时监听某目录下的日志文件，如有新文件切换到新文件，并同步写入kafka，同时记录日志文件的行位置，以应对进程异常退出，能从上次的文件位置开始读取（考虑到效率，这里是每100条记一次，可调整)
源码:
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.LineNumberReader;
import java.io.PrintWriter;
import java.io.RandomAccessFile;
import java.net.NoRouteToHostException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Properties;
import java.util.Random;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import kafka.javaapi.producer.Producer;
import kafka.producer.KeyedMessage;
import kafka.producer.ProducerConfig;
/*
* 自己在源服务器写生产者往kafka插入数据，注意文件"producer.properties放在linux下该jar文件同一目录
* 监听某个目录下的文件数据然后写入kafka
* nohup java -jar portallog_producer.jar portallog /var/apache/logs portallog.position >/home/sre/portalhandler/handler.log 2>&1 &
*
*
*/
public class PortalLogTail_Line {
private Producer<String,String> inner;
java.util.Random ran = new Random();
public PortalLogTail_Line() throws FileNotFoundException, IOException {
Properties properties = new Properties();
// properties.load(ClassLoader.getSystemResourceAsStream("producer.properties"));
properties.load(new FileInputStream("producer.properties"));
ProducerConfig config = new ProducerConfig(properties);
inner = new Producer<String, String>(config);
}
public void send(String topicName,String message) {
if(topicName == null || message == null){
return;
}
// KeyedMessage<String, String> km = new KeyedMessage<String, String>(topicName,message);
//随机作为key,hash分散到各个分区
KeyedMessage<String, String> km = new KeyedMessage<String, String>(topicName,String.valueOf(ran.nextInt(9)),message);
// KeyedMessage<String, String> km = new KeyedMessage<String, String>(topicName,message,message);
inner.send(km);
}
public void send(String topicName,Collection<String> messages) {
if(topicName == null || messages == null){
return;
}
if(messages.isEmpty()){
return;
}
List<KeyedMessage<String, String>> kms = new ArrayList<KeyedMessage<String, String>>();
for(String entry : messages){
KeyedMessage<String, String> km = new KeyedMessage<String, String>(topicName,entry);
kms.add(km);
}
inner.send(kms);
}
public void close(){
inner.close();
}
public String getNewFile(File file)
{
File[] fs=file.listFiles();
long maxtime=0;
String newfilename="";
for (int i=0;i<fs.length;i++)
{
if (fs[i].lastModified()>maxtime && fs[i].getName().contains("access"))
{
maxtime=fs[i].lastModified();
newfilename=fs[i].getAbsolutePath();
}
}
return newfilename;
}
//写入文件名及行号
public void writePosition(String path,int rn,String positionpath)
{
try {
BufferedWriter out = new BufferedWriter(new FileWriter(positionpath));
out.write(path+","+rn);
out.close();
} catch (IOException e) {
}
}
LineNumberReader randomFile=null;
String newfile=null;
String thisfile=null;
String prefile=null;
int ln=0;
int beginln=0;
public void realtimeShowLog(final File file,final String topicname, final String positionpath) throws IOException{
//启动一个线程每1秒钟读取新增的日志信息
new Thread(new Runnable(){
public void run() {
thisfile=getNewFile(file);
prefile=thisfile;
//访问position文件，如果记录了文件路径，及行号，则定位，否则使用最新的文件
try {
BufferedReader br=new BufferedReader(new FileReader(positionpath));
String line=br.readLine();
if (line!=null &&line.contains(","))
{
thisfile=line.split(",")[0];
prefile=thisfile;
beginln=Integer.parseInt(line.split(",")[1]);
}
} catch (FileNotFoundException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
//指定文件可读可写
try {
randomFile = new LineNumberReader(new FileReader(thisfile));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
while (true)
{
try {
Thread.sleep(100);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
try {
//获得变化部分的
// randomFile.seek(lastTimeFileSize);
String tmp = "";
while( (tmp = randomFile.readLine())!= null) {
int currln=randomFile.getLineNumber();
//beginln默认为0
if (currln>beginln)
send(topicname,new String(tmp.getBytes("utf8")));
ln++;
//每发生一条写一次影响效率,连续发100次后再记录位置
if (ln>100)
{
writePosition(thisfile,currln,positionpath);
ln=0;
}
}
thisfile=getNewFile(file);
if(!thisfile.equals(prefile))
{
randomFile.close();
randomFile = new LineNumberReader(new FileReader(thisfile));
prefile=thisfile;
beginln=0;
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}}).start();
}
/**
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Exception {
PortalLogTail_Line producer = new PortalLogTail_Line();
if (args.length!=3)
{
System.out.println("usage:topicname pathname positionpath");
System.exit(1);
}
String topicname=args[0];
String pathname=args[1];
String positionpath=args[2];
final File tmpLogFile = new File(pathname);
producer.realtimeShowLog(tmpLogFile,topicname,positionpath);
}
}
producer.properties文件放在同级目录下
metadata.broker.list=xxx:10909,xxx:10909
# name of the partitioner class for partitioning events; default partition spreads data randomly
#partitioner.class=
# specifies whether the messages are sent asynchronously (async) or synchronously (sync)
producer.type=sync
#producer.type=async
# specify the compression codec for all data generated: none , gzip, snappy.
# the old config values work as well: 0, 1, 2 for none, gzip, snappy, respectivally
compression.codec=none
#compression.codec=gzip
# message encoder
serializer.class=kafka.serializer.StringEncoder
测试
最后执行:
nohup java -jar portallog_producer.jar portallog /var/apache/logs portallog.position >/home/sre/portalhandler/handler.log 2>&1 &分类: Java,Kafka