如何在日志文件中的某些日期之间打印字符串 [英] How to print out a string between certain dates from log file

问题描述

所以我有一个日志文件，我需要搜索某些字符串，打印出某些日期范围之间的行。

So I've got a log file that i need to search for certain strings and print out the lines that fall in between certain date ranges.

Ive得到第一部分做了，但是卡在第二部分。我将如何在一定的日期内打印出一个字符串。所以说我想在2012-09-01和2012-09-15之间打印所有字符串

Ive got the first part done but im stuck on the second. How would i print out a string within a certain date. so say i want to print all strings between 2012-09-01 and 2012-09-15

日志示例：

 2012-09-13 16:04:22 DEBUG SID:34523 BID:1329 RID:65d33 'Starting new session'
 2012-09-13 16:04:30 DEBUG SID:34523 BID:1329 RID:54f22 'Authenticating User'
 2012-09-13 16:05:30 DEBUG SID:42111 BID:319 RID:65a23 'Starting new session'
 2012-09-13 16:04:50 ERROR SID:34523 BID:1329 RID:54ff3 'Missing Authentication token'
 2012-09-13 16:05:31 DEBUG SID:42111 BID:319 RID:86472 'Authenticating User'
 2012-09-13 16:05:31 DEBUG SID:42111 BID:319 RID:7a323 'Deleting asset with ID 543234'
 2012-09-13 16:05:32 WARN SID:42111 BID:319 RID:7a323 'Invalid asset ID'

这是我的代码到目前为止：

This is my code so far:

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Date;
import java.util.Scanner;


public class ReadLogs {

   public static void main(String args[]) throws FileNotFoundException{
       String line, logString ="";
       Date startDate, endDate;

       ArrayList<String> logList = new ArrayList<>();

       Scanner logScanner = new Scanner(new        File("C:\\Users\\cmccarth\\Desktop\\logs.txt"));
       while (logScanner.hasNextLine()) {
            line = logScanner.nextLine();
            logList.add(line);                  
        }

       for (String z : logList) {
//          System.out.println(z);
        }


      // This function prints out all lines containing a specific string

       for( int i = 0; i <= logList.size() - 1; i++)
       {
           logString = logList.get(i);
           if(logString.contains("16:04:22")){
               System.out.println("String Contains" +logString);
           }

       }
   }     
}

推荐答案

执行以下步骤：

1）创建2个要搜索的日期范围的Date对象（get这些日期使用简单的日期格式）：

1) Create 2 Date objects with the date range you want to search in ( get these dates using Simple date format) :

 Date lowerRange; 
 Date upperRange;

2）现在循环遍历过滤的日志列表，并从您的日志文件中获取的字符串，然后得到日期作为令牌[0]。

2) Now loop through your filtered log list and okenize the string that you get from the log file and then get the date as tokens[0].

String[] tokens = logString.split(" ");
String dateStr = tokens[0];

// Convert this date to String using Simple Date Format
Date date = new SimpleDateFormat("yyyy-MM-dd", Locale.ENGLISH).parse(dateStr);

3）现在，您可以将此日期与您必须查看的2个日期进行比较范围。

3) Now you can compare this date with the 2 dates that you have to see if it falls in the range.

if(date > lowerRange && date < upperRange)
{
  // this is the date you wanted...process the log file entry
}

请参阅以下SO发布字符串到日期转换：字符串到期

Refer the following SO post for String to Date conversion : String-to-date

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