将一个大文件分割成若干个小文件，每个文件最多10万行

public class Main {

    public static void main(String[] args) {

        BufferedReader br = null;
        BufferedWriter bw = null;

        int count = 0;
        int index = 1;
        String temp = "";

        try {
            br = new BufferedReader(new FileReader(new File("F:\\result.txt")));
            while((temp = br.readLine()) != null){
                bw = new BufferedWriter(new FileWriter(new File("F:\\output"+(index++)+".txt")));
                while(count < 100000){
                    bw.append(temp);
                    bw.newLine();
                    count++;
                    temp = br.readLine();
                    if(temp == null){
                        break;
                    }
                }
                count = 0;
                bw.close();
            }
            br.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

假设result.txt有200多万行。