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package com.youtu.sign;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
public class MD5 {
public static String stringToMD5(String str) {
try {
byte[] strTemp = str.getBytes();
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
mdTemp.update(strTemp);
return toHexString(mdTemp.digest());
} catch (Exception e) {
return null;
}
}
public static String fileNameToMD5(String fileName) {
InputStream inputStream = null;
try {
inputStream = new FileInputStream(fileName);
return streamToMD5(inputStream);
} catch (Exception e) {
return null;
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static String streamToMD5(InputStream inputStream) {
try {
MessageDigest mdTemp = MessageDigest.getInstance("MD5");
byte[] buffer = new byte[1024];
int numRead = 0;
while ((numRead = inputStream.read(buffer)) > 0) {
mdTemp.update(buffer, 0, numRead);
}
return toHexString(mdTemp.digest());
} catch (Exception e) {
return null;
}
}
private static String toHexString(byte[] md) {
char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f' };
int j = md.length;
char str[] = new char[j * 2];
for (int i = 0; i < j; i++) {
byte byte0 = md[i];
str[2 * i] = hexDigits[byte0 >>> 4 & 0xf];
str[i * 2 + 1] = hexDigits[byte0 & 0xf];
}
return new String(str);
}
}