Java-->在txt文件每一行前加行數和冒號

--> 這里是添加后復制到另一個文件，對同一文件的操作下次進行...

package com.dragon.java.addtotxt;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/*
 * 將day19-筆記.txt中每一行前面加上行號和冒號
 */
public class Test {
    public static void main(String args[]) {
                // 因為考慮到每行數據，用BufferedReader 比較方便
                BufferedReader br = null;
        BufferedWriter bw = null;
        try {
            br = new BufferedReader(new FileReader(
                    "D:/workspace/08-13/src/com/dragon/java/addtotxt/days.txt"));
            bw = new BufferedWriter(
                    new FileWriter(
                            "D:/workspace/08-13/src/com/dragon/java/addtotxt/days01.txt"));
                        String lineString = null;
            int i = 0;
            while (true) {
                i++;
                               // BufferedReader 的readline 方法，直接讀取一行數據
                lineString = br.readLine();
                if (lineString == null) {
                    break;
                } else {
                    lineString = "第" + i + "行：" + lineString;
                    bw.write(lineString); // 寫入一行數據
                    bw.newLine(); // 另起一行
                    System.out.println(lineString);
                }
            }
        } catch (Exception e) {
            System.out.println(e);
        } finally {
            try {
                bw.close();
                br.close();
            } catch (IOException e) {
                System.out.println(e);
            }
        }
    }
}