How to append the log file

Question

1.00/5 (1 vote)

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I want to append the log file on each time of execution.
How to do this using fallowing code...

What I have tried:

I'm writing log file using this code.....

Java

static String fileTempPath= System.getProperty("java.io.tmpdir");
	static Date ch=new java.sql.Date(System.currentTimeMillis());
	static File tempFile=new File(fileTempPath+"PurgeLog"+ch  +  ".log");
		static PrintWriter out;
    public static void main(String[] args)                             
    {
				out=new PrintWriter(tempFile);
				out.println("main started:")
			 out.println("heloooo:")
out.close();
			 
    }
	}

Posted 10-Apr-17 0:11am

Member 13012003

Updated 10-Apr-17 0:58am

CPallini

v3

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Jochen Arndt · Accepted Answer · 2017-04-10T00:39:00

Solution 1

Use the FileWriter (Java Platform SE 7 )[^] class and the constructor that accepts an append parameter:

Java

FileWriter out = new FileWriter(fileTempPath+"PurgeLog"+ch + ".log", true);
out.write("main started:\n");
out.write("heloooo:\n");
out.close();

Posted 10-Apr-17 0:39am

Jochen Arndt

Comments

CPallini 10-Apr-17 6:57am

5.

Member 13012003 12-Apr-17 0:19am

It is working fine...but how to prepend??? i.e latest execution logs should come first..

Jochen Arndt 12-Apr-17 2:55am

That is rather uncommon and is not so simple as appending.
A possible solution:
- Create a new temporaray file
- Write data to that file
- Open log file, read content (e.g. line by line) and write to the temp file
- Close temporary file
- Delete log file
- Rename temporary file to log file