MD5Util 工具类

package util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {

private static String encodingCharset = "UTF-8";

/**
* md5加密
*
* @param aValue
* @return
*/
public static String digest(String aValue) {
aValue = aValue.trim();
byte value[];
try {
value = aValue.getBytes(encodingCharset);
} catch (UnsupportedEncodingException e) {
value = aValue.getBytes();
}
MessageDigest md = null;
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
return null;
}
return toHex(md.digest(value));

}

public static String toHex(byte input[]) {
if (input == null)
return null;
StringBuffer output = new StringBuffer(input.length * 2);
for (int i = 0; i < input.length; i++) {
int current = input[i] & 0xff;
if (current < 16)
output.append("0");
output.append(Integer.toString(current, 16));
}

return output.toString();
}

}