Java-->在txt文件每一行前加行数和冒号

--> 这里是添加后复制到另一个文件，对同一文件的操作下次进行...

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;
 
/*
 * 将day19-笔记.txt中每一行前面加上行号和冒号
 */
public class Test {
    public static void main(String args[]) {
                // 因为考虑到每行数据，用BufferedReader 比较方便
                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，直接读取一行数据
                lineString = br.readLine();
                if (lineString == null) {
                    break;
                } else {
                    lineString = "第" + i + "行：" + lineString;
                    bw.write(lineString); // 写入一行数据
                    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);
            }
        }
    }
}