java 文件按行读写

 1 import java.io.BufferedReader;

 2 import java.io.BufferedWriter;

 3 import java.io.File;

 4 import java.io.FileReader;

 5 import java.io.FileWriter;

 6 import java.io.IOException;

 7

 8 public class Demo001 {

 9

10     public static void writeFile(String strSrc, String dest) {

11         FileWriter writer = null;

12         FileReader reader = null;

13         BufferedReader br = null;

14         BufferedWriter bw = null;

15

16         try {

17             File file = new File(dest);

18             if (!file.exists()) {

19                 file.createNewFile();

20             }

21

22             // 这里的true，是以追加的方式写

23             writer = new FileWriter(dest, true);

24

25             reader = new FileReader(strSrc);

26

27             String str = null;

28

29             br = new BufferedReader(reader);

30

31             bw = new BufferedWriter(writer);

32

33             while ((str = br.readLine()) != null) {

34                 StringBuffer sb = new StringBuffer("");

35

36                 sb.append(str + "\n");

37                 bw.write(sb.toString());

38             }

39

40             br.close();

41             reader.close();

42

43             bw.close();

44             writer.close();

45

46         } catch (IOException e) {

47             e.printStackTrace();

48         }

49     }

50

51     public static void main(String[] args) {

52         Demo001.writeFile("D:/hw31a.txt", "D:/hw31c.txt");

53         Demo001.writeFile("D:/hw31b.txt", "D:/hw31c.txt");

54     }

55 }

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