如何将 .txt 文件转换为 .xls 文件 read/write？

Question

所以在我的项目中，我曾经使用 read/write 数据 from/to .txt 文件，但我意识到如果我从 excel 中这样做会更好文件。我就是这样做的。

        for (File benchmarkLoop : listOfFiles) {
        String line = null;
        BufferedReader in = null;
        try {
                in = new BufferedReader(new FileReader("benchmarks\" + benchmarkLoop.getName()));  
            } catch (FileNotFoundException fnfe) {
                fnfe.printStackTrace();
            }
            Writer writer = null;
            File file = new File("results", benchmarkLoop.getName());
            writer = new BufferedWriter(new FileWriter(file));}

现在我必须改变这个，我对jxl不太熟悉。

        while (initializingIterations > 0) {
                line = in.readLine();
                writer.write(0 + System.getProperty("line.separator"));          
                markov.update(  new Integer((int) (Math.round(Float.parseFloat(line)/interval))));   
                initializingIterations--;     
            }

        while ((line = in.readLine()) != null )

Answer 1

试试这个，

Lists.partition(pv1Column, 3);

参考：Lists.Partition()

Answer 2

使用 Java 8 没有任何额外的库：

private static <T> List<List<T>> partitionList(List<T> list, int size) {
    return IntStream.range(0, (list.size() + (size - 1)) / size)
            .mapToObj(x -> list.subList(x * size, Math.min((x + 1) * size, list.size())))
            .collect(Collectors.toList());
}

Answer 3

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class SplitList {
    public static void main(String[] args){
        List<Integer> list = IntStream.rangeClosed(0, 10).boxed().collect(Collectors.toList());
        int[] count = new int[1];
        List<List<Integer>> sublists = list.stream()
                .collect(Collectors.groupingBy(e -> (list.size() - count[0]++)/6))
                .values()
                .stream()
                .collect(Collectors.toList());
        sublists.stream().forEach(System.out::println);
    }
}


>> The results on cli:
[6, 7, 8, 9, 10]
[0, 1, 2, 3, 4, 5]

如何将 .txt 文件转换为 .xls 文件 read/write？

How do I convert from .txt to .xls file read/write?

java

jxl