文件，byte[]，HexString 之间的转换

Java代码

1. import java.io.BufferedOutputStream;
2. import java.io.ByteArrayOutputStream;
3. import java.io.File;
4. import java.io.FileInputStream;
5. import java.io.FileNotFoundException;
6. import java.io.FileOutputStream;
7. import java.io.IOException;
9. /**
10. *
11. * 文件，byte[]，HexString 之间的转换
12. *
13. */
14. public class FileDataConvert {
16. public static void main(String[] args) {
17. String srcFilePath = "d:/testFrom.png";
18. String outFilePath = "d:/";
19. String outFileName = "testTo.png";
21. byte[] bytes = getBytesFromFile(srcFilePath);
22. String str = bytes2HexString(bytes);
23. System.out.println(str);
25. byte[] bytes2 = hexString2Bytes(str);
26. saveBytes2File(bytes2, outFilePath, outFileName);
27. }
29. /**
30. * 从文件中获取byte数组
31. */
32. public static byte[] getBytesFromFile(String filePath) {
33. byte[] buffer = null;
34. try {
35. File file = new File(filePath);
36. FileInputStream fis = new FileInputStream(file);
37. ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
38. byte[] b = new byte[1024];
39. int n;
40. while ((n = fis.read(b)) != -1) {
41. bos.write(b, 0, n);
42. }
43. fis.close();
44. bos.close();
45. buffer = bos.toByteArray();
46. } catch (FileNotFoundException e) {
47. e.printStackTrace();
48. } catch (IOException e) {
49. e.printStackTrace();
50. }
51. return buffer;
52. }
54. /**
55. * 根据byte数组生成文件
56. */
57. public static void saveBytes2File(byte[] bfile, String filePath, String fileName) {
58. BufferedOutputStream bos = null;
59. FileOutputStream fos = null;
60. File file = null;
61. try {
62. File dir = new File(filePath);
63. if (!dir.exists() && dir.isDirectory()) {
64. dir.mkdirs();
65. }
66. file = new File(filePath + "\\" + fileName);
67. fos = new FileOutputStream(file);
68. bos = new BufferedOutputStream(fos);
69. bos.write(bfile);
70. } catch (Exception e) {
71. e.printStackTrace();
72. } finally {
73. if (bos != null) {
74. try {
75. bos.close();
76. } catch (IOException e1) {
77. e1.printStackTrace();
78. }
79. }
80. if (fos != null) {
81. try {
82. fos.close();
83. } catch (IOException e1) {
84. e1.printStackTrace();
85. }
86. }
87. }
88. }
90. /**
91. * 从字节数组到十六进制字符串转换
92. */
93. public static String bytes2HexString(byte[] b) {
94. byte[] buff = new byte[2 * b.length];
95. for (int i = 0; i < b.length; i++) {
96. buff[2 * i] = hex[(b[i] >> 4) &0x0f];
97. buff[2 * i + 1] = hex[b[i] &0x0f];
98. }
99. return new String(buff);
100. }
102. /**
103. * 从十六进制字符串到字节数组转换
104. */
105. public static byte[] hexString2Bytes(String hexstr) {
106. byte[] b = new byte[hexstr.length() / 2];
107. int j = 0;
108. for (int i = 0; i < b.length; i++) {
109. char c0 = hexstr.charAt(j++);
110. char c1 = hexstr.charAt(j++);
111. b[i] = (byte) ((parse(c0) << 4) | parse(c1));
112. }
113. return b;
114. }