Conversion between Java file, object, and byte []

1. import Java. io. bufferedoutputstream; 2. import Java. io. bytearrayinputstream; 3. import Java. io. bytearrayoutputstream; 4. import Java. io. file; 5. import Java. io. fileinputstream; 6. import Java. io. fileoutputstream; 7. import Java. io. ioexception; 8. import Java. io. objectinputstream; 9. import Java. io. objectoutputstream; 10. import Java. io. serializable; 11. 12. public class byte_file_object {13. 14. /** 15. * convert the file to a byte array 16. * @ edittime 11:45:28. */18. public static byte [] getbytesfromfile (file F) {19. if (F = NULL) {20. return NULL; 21 .} 22. try {23. fileinputstream stream = new fileinputstream (f); 24. bytearrayoutputstream out = new bytearrayoutputstream (1000); 25. byte [] B = new byte [1000]; 26. int N; 27. while (n = stream. read (B ))! =-1) {28. out. write (B, 0, n); 29 .} 30. stream. close (); 31. out. close (); 32. return out. tobytearray (); 33 .} catch (ioexception e) {34 .} 35. return NULL; 36 .} 37. 38. /** 39. * Save the byte array as a file 40. * @ edittime 11:45:56. */42. public static file getfilefrombytes (byte [] B, string outputfile) {43. bufferedoutputstream stream = NULL; 44. file file = NULL; 45. try {46. file = new file (Outputfile); 47. fileoutputstream fstream = new fileoutputstream (File); 48. stream = new bufferedoutputstream (fstream); 49. stream. write (B); 50 .} catch (exception e) {51. e. printstacktrace (); 52 .} finally {53. if (stream! = NULL) {54. try {55. stream. close (); 56 .} catch (ioexception E1) {57. e1.printstacktrace (); 58 .} 59 .} 60 .} 61. return file; 62 .} 63. 64. /** 65. * Get object 66 from byte array. * @ edittime 11:46:34 a.m. 67. */68. public static object getobjectfrombytes (byte [] objbytes) throws exception {69. if (objbytes = NULL | objbytes. length = 0) {70. return NULL; 71 .} 72. bytearrayinputstream Bi = new bytearrayinputstream (objbytes); 73. objectinputstream OI = new objectinputstream (BI); 74. return Oi. readobject (); 75 .} 76. 77. /** 78. * Get a byte array from the object 79. * @ edittime 11:46:56 80. */81. public static byte [] getbytesfromobject (serializable OBJ) throws exception {82. if (OBJ = NULL) {83. return NULL; 84 .} 85. bytearrayoutputstream BO = new bytearrayoutputstream (); 86. objectoutputstream oo = new objectoutputstream (BO); 87. oo. writeobject (OBJ); 88. return Bo. tobytearray (); 89 .} 90 .}