44.Android MD5Util

44.Android MD5Util

public class MD5Util {

public static String getMD5String(String key) {
char hexDigits[] = {'0', '1', '2', '3', '4',
'5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'};
try {
byte[] input = key.getBytes();
// MD5算法的 MessageDigest 对象
MessageDigest md5Digest = MessageDigest.getInstance("MD5");
// 转换
md5Digest.update(input);
// 密文
byte[] md5byte = md5Digest.digest();
// string 转 十六进制
int j = md5byte.length;
char md5char[] = new char[j * 2];
int k = 0;
for (byte b : md5byte) {
md5char[k++] = hexDigits[b >>> 4 & 0xf];
md5char[k++] = hexDigits[b & 0xf];
}
return new String(md5char);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

private static String bytesToHexString(byte[] bytes) {
StringBuilder sb = new StringBuilder();
for (byte aByte : bytes) {
String hex = Integer.toHexString(255 & aByte);
if (hex.length() == 1) {
sb.append('0');
}
sb.append(hex);
}
return sb.toString();
}

}