Java使用FileOutputStream寫入文件

From: http://beginnersbook.com/2014/01/how-to-write-to-a-file-in-java-using-fileoutputstream/

 

1. /* 使用FileOutputStream寫入文件，FileOutputStream的write() 方法只接受byte[] 類型
2. 的參數，所以需要將string通過getBytes()方法轉換為字節數組。
3. 1、首先判斷文件是否存在，不存在就新建一個
4. 2、寫入文件是以覆蓋方式
5. 3、文件不存在會自動創建，存在則會被重寫
6. */
7.  
8. import java.io.*;
9.  
10. public class Exercise {
11.  
12. public static void main(String args[]) {
13. FileOutputStream fos = null;
14. File file;
15. String mycontent = "This is my Data which needs to be written into the file.";
16. try {
17. // specify the file path
18. file = new File("/home/zjz/Desktop/myFile.txt");
19. fos = new FileOutputStream(file);
20. /* This logic will check whether the file exists or not.
21. if the file is not found at the specified location it would create
22. a new file
23. */
24. // if (!file.exists()) {
25. // file.createNewFile();
26. // }
27. /* String content cannot be directly written into a file.
28. It needs to be converted into bytes
29. */
30. byte[] bytesArray = mycontent.getBytes();
31. fos.write(bytesArray);
32. fos.flush();
33. System. out.println("File Written Successfully");
34. } catch (FileNotFoundException e) {
35. e.printStackTrace();
36. } catch (IOException e) {
37. e.printStackTrace();
38. } finally {
39. try {
40. if (fos != null) {
41. fos.close();
42. }
43. } catch (IOException ioe) {
44. System. out.println("Error in closing the Stream");
45. }
46. }
47. }
48.  
49. }