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===============日志信息实时生产类=================
package com.nginxlog; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.Writer; import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; /** <p>title: 日志服务器</p> <p>Description: 模拟日志服务器</p> <p>CopyRight: CopyRight (c) 2010</p> <p>Company: 99bill.com</p> <p>Create date: 2010-6-18</P> @author Tank Zhang<[email protected]> @version v0.1 2010-6-18 */ // =============== 日志产生类 ==================== /* 执行LogSvr类,LogSvr类会启动一个线程,每5秒钟向mock.log日志文件写一次数据, 然后再执行LogView类,LogView每隔1秒钟读一次,如果数据有变化则输出变化的部分. */ public class LogSvr { private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); /** 将信息记录到日志文件 @param logFile 日志文件 @param mesInfo 信息 @throws IOException */ public void logMsg(File logFile, String mesInfo) throws IOException { if (logFile == null) { throw new IllegalStateException("logFile can not be null!"); } Writer txtWriter = new FileWriter(logFile, true); txtWriter.write(dateFormat.format(new Date()) + "\t" + mesInfo + "\n"); txtWriter.flush(); } public static void main(String[] args) throws Exception { final LogSvr logSvr = new LogSvr(); final File tmpLogFile = new File("mock.log"); if (!tmpLogFile.exists()) { tmpLogFile.createNewFile(); } //启动一个线程每5秒钟向日志文件写一次数据 ScheduledExecutorService exec = Executors.newScheduledThreadPool(1); exec.scheduleWithFixedDelay(new Runnable() { public void run() { try { logSvr.logMsg(tmpLogFile, "xxxxxxxxxxxxx"); } catch (IOException e) { throw new RuntimeException(e); } } }, 0, 5, TimeUnit.SECONDS); } }
===============日志信息实时监控读取类=================
package com.nginxlog; import java.io.File; import java.io.IOException; import java.io.RandomAccessFile; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; public class LogView { private long lastTimeFileSize = 0; //上次文件大小 /** * 实时输出日志信息 * @param logFile 日志文件 * @throws IOException */ public void realtimeShowLog(File logFile) throws IOException { /* window 跑 main方法: 读取和写出文件的路径都是默认项目根目录中的文件,那么只需要定义出文件名而无需写出具体路径, 即可使用 new File("文件名") 读取和写出项目根目录中的文件。 window、linux 跑 tomcat: 读取和写出文件的路径 需要写出 具体的文件和及其绝对路径,即 new File("/绝对路径/文件名"); */ //指定文件可读可写 final RandomAccessFile randomFile = new RandomAccessFile(logFile,"rw"); //启动一个线程每1秒钟读取新增的日志信息 ScheduledExecutorService exec = Executors.newScheduledThreadPool(1); exec.scheduleWithFixedDelay(new Runnable(){ public void run() { try { //将文件记录指针定位到pos位置,一开始从0的位置开始读取 randomFile.seek(lastTimeFileSize); String tmp = ""; while( (tmp = randomFile.readLine())!= null) { System.out.println(new String(tmp.getBytes("ISO8859-1"))); } lastTimeFileSize = randomFile.length(); } catch (IOException e) { throw new RuntimeException(e); } } }, 0, 1, TimeUnit.SECONDS); } public static void main(String[] args) throws Exception { LogView view = new LogView(); final File tmpLogFile = new File("mock.log"); view.realtimeShowLog(tmpLogFile); } }