前言
本文主要给大家介绍了关于Java读取二进制文件的相关内容，分享出来供大家参考学习，下面话不多说了，来一起看看详细的介绍吧。
读Hex写CSV
data目录下有little-endian bin文件，2个字节代表一个数字。
bin存储的数据格式可自己定义。相同的方法可以直接应用到Android中。
|
1
2
3
4
5
|
`-- networkProj |-- data |-- networkProj.iml |-- out `-- src |
实现方法
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
private static void convertFiles() { File folder = new File("data"); // data folder log("--------- Read little-endian data from bin file ---------"); if (!folder.exists()) { log("folder is not exist!"); return; } File outputFolder = new File(folder.getAbsolutePath() + File.separator + "output"); if (!outputFolder.exists()) { boolean newOutput = outputFolder.mkdir(); log("New output folder " + newOutput); } File[] files = folder.listFiles(); if (files != null) { log("folder is " + folder.getAbsolutePath()); for (File f : files) { log("\t" + f.getName()); } } else { log("Nothing in this folder"); return; } for (File currentFile : files) { if (!currentFile.isFile()) { return; } String fileName = currentFile.getName(); fileName = fileName.substring(0, fileName.length() - 4); // delete suffix File csvFile = new File(outputFolder.getAbsolutePath() + File.separator + fileName + ".csv"); if (csvFile.exists()) { boolean deRes = csvFile.delete(); log("Delete old csv: " + deRes); } byte[] readBytes = new byte[512]; try { boolean newCsv = csvFile.createNewFile(); log(csvFile.getAbsolutePath() + " " + newCsv); FileOutputStream csvFos = new FileOutputStream(csvFile); InputStream in = new FileInputStream(currentFile); while (in.read(readBytes) != -1) { int[] csvData = convertBytesToInts(readBytes); for (int d : csvData) { csvFos.write(String.valueOf(d).getBytes()); csvFos.write("\n".getBytes()); } } csvFos.flush(); csvFos.close(); } catch (Exception e) { e.printStackTrace(); } }}// little-endian; 2 bytes -> 1 intprivate static int[] convertBytesToInts(byte[] inputData) { int[] rawData = new int[inputData.length / 2]; int rawIndex = 0; for (int i = 0; i < inputData.length; i += 2) { int raw = (0xff & inputData[i + 1]) * 256 + (0xff & inputData[i]); if (raw >= 32768) { raw -= 65536; } rawData[rawIndex] = raw; rawIndex++; } return rawData;}private static void log(String l) { System.out.println(l);} |
控制台输出
|
1
2
3
4
5
6
|
--------- Read little-endian data from bin file ---------New output folder truefolder is G:\javaProj\networkProj\data data20170215_180621.bin outputG:\javaProj\networkProj\data\output\data20170215_180621.csv true |
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。
原文链接：http://rustfisher.github.io/2017/02/16/Java_note/Java_Read_Hex_write_csv/
