Java中文件与字节数组转换

2024-10-10 07:11:16

注:来源于JavaEye

文件转化为字节数组:

http://www.javaeye.com/topic/304980

/**
* 文件转化为字节数组
*
* @param file
* @return
*/
public static byte[] getBytesFromFile(File file) {
byte[] ret = null;
try {
if (file == null) {
// log.error("helper:the file is null!");
return null;
}
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream out = new ByteArrayOutputStream(4096);
byte[] b = new byte[4096];
int n;
while ((n = in.read(b)) != -1) {
out.write(b, 0, n);
}
in.close();
out.close();
ret = out.toByteArray();
} catch (IOException e) {
// log.error("helper:get bytes from file process error!");
e.printStackTrace();
}
return ret;
}

字节数组转化为文件

http://www.javaeye.com/topic/304982

/**
* 把字节数组保存为一个文件
*
* @param b
* @param outputFile
* @return
*/
public static File getFileFromBytes(byte[] b, String outputFile) {
File ret = null;
BufferedOutputStream stream = null;
try {
ret = new File(outputFile);
FileOutputStream fstream = new FileOutputStream(ret);
stream = new BufferedOutputStream(fstream);
stream.write(b);
} catch (Exception e) {
// log.error("helper:get file from byte process error!");
e.printStackTrace();
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// log.error("helper:get file from byte process error!");
e.printStackTrace();
}
}
}
return ret;
}

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