前言
本文主要給大家介紹了關于Java讀取二進制文件的相關內容，分享出來供大家參考學習，下面話不多說了，來一起看看詳細的介紹吧。
讀Hex寫CSV
data目錄下有little-endian bin文件，2個字節代表一個數字。
bin存儲的數據格式可自己定義。相同的方法可以直接應用到Android中。
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`-- networkProj |-- data |-- networkProj.iml |-- out `-- src |
實現方法
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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);} |
控制臺輸出
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--------- 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 |
總結
以上就是這篇文章的全部內容了，希望本文的內容對大家的學習或者工作能帶來一定的幫助，如果有疑問大家可以留言交流，謝謝大家對服務器之家的支持。
原文鏈接：http://rustfisher.github.io/2017/02/16/Java_note/Java_Read_Hex_write_csv/
