前言

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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。

`-- networkProj

|-- data

|-- networkProj.iml

|-- out

`-- src

实现方法

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 int

private 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

--------- Read little-endian data from bin file ---------

New output folder true

folder is G:\javaProj\networkProj\data

data20170215_180621.bin

output

G:\javaProj\networkProj\data\output\data20170215_180621.csv true

总结

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本文来源：http://rustfisher.github.io/2017/02/16/Java_note/Java_Read_Hex_write_csv/