java实时监听日志写入kafka（转）

Posted 2020-06-21 ~风轻云淡~

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 &