java删除一个目录下面的所有文件_JAVA_编程开发_程序员俱乐部

如下程序：

1. import?java.io.File;??
2. ??
3. public?class?DeleteAll{??
4. ??
5. ?public?static?void?deleteAll(File?file){??
6. ???
7. ???if(file.isFile()?||?file.list().length?==0)??
8. ???{??
9. ???file.delete();???????
10. ???}else{??????
11. ?????File[]?files?=?file.listFiles();??
12. ?????for?(int?i?=?0;?i?<?files.length;?i++)?{??
13. ????deleteAll(files[i]);??
14. ????files[i].delete();??????
15. ???}??
16. ??
17. ????????
18. ???????if(file.exists())?????????//如果文件本身就是目录?，就要删除目录??
19. ???????file.delete();??
20. ???}??
21. ?}??
22. ??
23. ?public?static?void?main(String[]?args){???????
24. ?????File?f?=?new?File("f:"+File.separator+"test");??
25. ?????deleteAll(f);??
26. ?}??
27. }??

?

?

请不要轻易测试！ 我的单元测试如下：

1. package?com.jzm;??
2. ??
3. import?java.io.File;??
4. ??
5. import?junit.framework.Assert;??
6. ??
7. import?junit.framework.TestCase;??
8. ??
9. ??
10. public?class?DeleteAllTest?extends?TestCase{??
11. ??
12. ????public?void?testDeleteAll(){???//如果是一个文件??
13. ??????????
14. ????????File?file??=?null;??
15. ??????????
16. ????????try{??
17. ??????????
18. ????????file?=?new?File("f:\\test\\a.txt");??
19. ??????????
20. ????????file.createNewFile();??????????????
21. ??????????
22. ????????DeleteAll.deleteAll(file);??
23. ??????????
24. ????????}catch?(Exception?e)?{??
25. ????????????//?TODO:?handle?exception??
26. ????????}?????
27. ????????Assert.assertFalse(file.exists());????????
28. ????}??
29. ??????
30. ??????
31. ????public?void?testDeleteAll2(){?????????//如果是一个一级目录??
32. ??????????????
33. ????????????File?directory??=?null;??
34. ??????????????
35. ????????????try{??
36. ??????????????????????????
37. ????????????directory??=?new?File("f:"+?File.separator?+"dirT2");??
38. ???????????????
39. ????????????directory.mkdir();??
40. ??????????????
41. ????????????File?file1?=?new?File(directory,?"t1.txt");??
42. ??????????????
43. ????????????File?file2?=?new?File(directory,?"t2.txt");??
44. ??????????????
45. ????????????file1.createNewFile();??
46. ??????????????
47. ????????????file2.createNewFile();????????????
48. ??????????????
49. ????????????DeleteAll.deleteAll(directory);???????
50. ??????????????
51. ????????????}catch?(Exception?e)?{??
52. ??????????????????
53. ????????????????//?TODO:?handle?exception?????????????????
54. ????????????}?????????????????????
55. ????????????Assert.assertFalse(directory.exists());???????
56. ????????}??
57. ??????
58. ????public?void?testDeleteAll3(){??????????//如果是一个二级目录??
59. ??????????
60. ????????File?directory??=?null;??
61. ??????????
62. ????????try{??
63. ??????????????????????
64. ????????directory??=?new?File("f:"+?File.separator?+"dirT3");??
65. ???????????
66. ????????directory.mkdir();??
67. ??????????
68. ????????File??dir1??=?new?File(directory,"dir1");??
69. ????????dir1.mkdir();??
70. ??????????
71. ????????File??dir2??=?new?File(directory,"dir2");??
72. ????????dir2.mkdir();??
73. ??????????
74. ??????????
75. ????????File?file1?=?new?File(dir1,?"t1.txt");??
76. ??????????
77. ????????File?file2?=?new?File(dir2,?"t2.txt");??
78. ??????????
79. ????????file1.createNewFile();??
80. ??????????
81. ????????file2.createNewFile();????????????
82. ??????????
83. ????????DeleteAll.deleteAll(directory);???????
84. ??????????
85. ????????}catch?(Exception?e)?{??
86. ??????????????
87. ????????????//?TODO:?handle?exception?????????????????
88. ????????}?????????????
89. ????????Assert.assertFalse(directory.exists());???????
90. ????}??
91. ??
92. ??????
93. } ?