测试单个php文件获取的值,获取单个文件的MD5值
版本0
/**
* 获取单个文件的MD5值！
*
* @param file
* @return
*/
public static String getFileMD5(File file) {
if (!file.isFile()) {
return null;
}
MessageDigest digest = null;
FileInputStream in = null;
byte buffer[] = new byte[1024];
int len;
try {
digest = MessageDigest.getInstance("MD5");
in = new FileInputStream(file);
while ((len = in.read(buffer, 0, 1024)) != -1) {
digest.update(buffer, 0, len);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
return null;
}
BigInteger bigInt = new BigInteger(1, digest.digest());
return bigInt.toString(16).toUpperCase();
}
版本1(解决版本0的方法：当文件的md5值是0开头的时候会出问题，之前的方法会把开头的0去掉)
//解决上面方法：当文件的md5值是0开头的时候会出问题，之前的方法会把开头的0去掉
public static String getFileMD5(File file) {
if (!file.isFile()) {
return null;
}
MessageDigest digest = null;
FileInputStream in = null;
byte buffer[] = new byte[1024];
int len;
try {
digest = MessageDigest.getInstance("MD5");
in = new FileInputStream(file);
while ((len = in.read(buffer, 0, 1024)) != -1) {
digest.update(buffer, 0, len);
}
in.close();
} catch (Exception e) {
e.printStackTrace();
return null;
}
String fileMD5 = bytesToHexString(digest.digest());
if (null == fileMD5) {
return null;
}
fileMD5 = fileMD5.toUpperCase();
LogHelper.e("ATU", "文件MD5值：" + fileMD5);
return fileMD5;
}
public static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder("");
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}