Android获取文件MD5
通过 java.security 包下的MessageDigest工具，可以简单快捷的直接计算出文件的MD5值
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| fun getFileMd5(path: String?): String? {
if (path == null || path.isEmpty()) {
return ""
}
try {
val messagedigest = MessageDigest.getInstance("MD5")
val buf = ByteArray(4096)
var n: Int
val fis = FileInputStream(path)
while (fis.read(buf, 0, 4096).also { n = it } > 0) {
messagedigest.update(buf, 0, n)
}
fis.close()
return HexUtils.toHexString(messagedigest.digest())
} catch (e: Exception) {
e.printStackTrace()
}
return ""
}
|
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| private static char[] hexDigits = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
static String toHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder(2 * bytes.length);
for (int l = 0; l < bytes.length; l++) {
char c0 = hexDigits[(bytes[l] & 0xf0) >> 4];
char c1 = hexDigits[bytes[l] & 0xf];
sb.append(c0);
sb.append(c1);
}
return sb.toString();
}
|