在java中读取日志文件

是否可以使用java读取日志文件（abc.log）？

我想从我的日志文件中获取特定的字符串。

假设这是我的日志文件的内容。 我只想要时间戳（例如：05:08:37）并将其打印到控制台。

2012-12-16 05:08:37,905 [Thread-1] INFO com.submit.SubmitService - Wait time 500 2012-12-16 05:08:38,444 [Thread-1] INFO com.submit.SubmitService - NO OF RECORDS TILL NOW 3755 TOTAL TIME -- << 539 2012-12-16 05:08:38,668 [Thread-1] INFO com.submit.SubmitService - Active Connection:: -69076 2012-12-16 05:08:38,670 [Thread-1] INFO com.submit.SubmitService - Active Connection:: -65764 

Answer 1

您可以将“日志文件”作为普通文件读取。

然后，您可以使用正则表达式来获取所需的字符串部分：

 try{ FileInputStream fstream = new FileInputStream("abc.log"); BufferedReader br = new BufferedReader(new InputStreamReader(fstream)); String strLine; /* read log line by line */ while ((strLine = br.readLine()) != null) { /* parse strLine to obtain what you want */ System.out.println (strLine); } fstream.close(); } catch (Exception e) { System.err.println("Error: " + e.getMessage()); } 

Answer 2

import java.io.File; import java.io.FileNotFoundException; importjava.util.Scanner; import java.sql。*;

公共课ReadingEntireFileWithoutLoop {

 public static void main(String[] args) throws FileNotFoundException { File file = new File("X:\\access.log"); Scanner sc = new Scanner(file); sc.useDelimiter(",|\r\n"); System.out.println(sc.next()); while(sc.hasNext()){ System.out.println(sc.next()); } // closing the scanner stream sc.close(); }