During writing into text file splitting into a new file after Nth Rows in java?

Question

Suppose I have 105 records and I want write all records in text files where in each file there will be 10 records.

so total file will generate here 11.

Do you have some code? Just use a for-loop. For example `int maxCnt = 10; for(int i=0;i — killexe, Aug 07 '15 at 05:19
What have you tried so far? In which way was the result of your attempts different from the requirement? — Hulk, Aug 07 '15 at 05:28

score 0 · Answer 1 · edited Aug 07 '15 at 06:48

0

Try this

    int count = 0; String filename = "text1";
    for (int i = 0; i <= 105; i++) // loop to 105 times
    {
       count++;
       if(count <= 10) //write 10 records to the file
       {
            if(count == 1)
                filename = "text" + (i/10); 

            try(PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(filename, true)))) {
            out.println("the text");

            }catch (IOException e) {}
            if(count == 10)
                count = 0;
       }
    }

edited Aug 07 '15 at 06:48

Avijit Das

52
4

answered Aug 07 '15 at 05:30

Harshit

5,147
9
46
93

...but please don't hardcode the limits. In any "real" code (no matter whether production or homework), this should be in a method, the input (some kind of collection, probably a List) and the number of entries per file should be parameters (probably the filename-pattern too). – Hulk Aug 07 '15 at 05:38
@Harshit , in file writing position i am written below code but it's creates only one file. File file = new File(filename+".txt"); // creates the file file.createNewFile(); // creates a FileWriter Object FileWriter writer = new FileWriter(file); writer.write("avijit"); // Writes the content to the file writer.flush(); writer.close(); – Avijit Das Aug 07 '15 at 06:12
@Harshit, Now it's creating 11 file but in each file there is only one record. – Avijit Das Aug 07 '15 at 06:20
Actually I dont have java installed on the system, So cannot run it. So just guessing the output. Are you really appending the file or just overwriting the previous file ? – Harshit Aug 07 '15 at 06:25
@Harshit, Every time i am creating new file.and then write into this file. – Avijit Das Aug 07 '15 at 06:30

Astrogat · Answer 2 · 2015-08-07T07:38:01.597

public static void writeToMultipleFiles(int numberOfLines, String prefix, List<String> records){
    lineCounter = 1;
    counter = 1;
    String filename = prefix + counter; 
    for (String line : records){
        if(lineCounter = numberOfLines){
            lineCounter = 1;
            counter++;
            filename = prefix + counter;
        }
        try(PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(filename, true)))) {
            out.println(line);
            lineCounter++;
        }catch (IOException e) {}

    }
}

score 0 · Answer 3 · answered Feb 22 '22 at 04:33

public static void writeToMultipleFilesExp() {
        int lineNumber = 0;
        int rowLimit = 10;
        String timeStamp = new SimpleDateFormat("yyyy.MM.dd.HH.mm.ss").format(new Date());
        String filename = null;
        PrintWriter out = null;
        for (int i = 0; i <= 105; i++) {
            lineNumber++;
            try {
                if (lineNumber <= rowLimit) {
                    if (lineNumber == 1) {
                        filename = "C:\\temp\\sep\\file_" + timeStamp + "_" + + (i / rowLimit) + ".txt";
                        out = new PrintWriter(new BufferedWriter(new FileWriter(filename, true)));
                    } 
                    out.println("the text");                    
                }
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (lineNumber == rowLimit || i==105) { // i==105 is needed or else last page will not be rendered.
                    lineNumber = 0;
                    out.close();
                }               
            }           
        }
    }

During writing into text file splitting into a new file after Nth Rows in java?

3 Answers3