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StringUtils.java
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StringUtils.java
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/**
* Copyright (c) 2014 OGN, All Rights Reserved.
*/
package org.ogn.commons.utils;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class defines a set of utility methods operating on strings and commonly used in the project
*/
public class StringUtils {
private static final Logger LOG = LoggerFactory.getLogger(StringUtils.class);
private StringUtils() {
}
public static String hex2ascii(String hex) {
final StringBuilder output = new StringBuilder();
for (int i = 0; i < hex.length(); i += 2) {
final String str = hex.substring(i, i + 2);
output.append((char) Integer.parseInt(str, 16));
}
return output.toString();
}
public static String asciiToHex(String asciiValue) {
final char[] chars = asciiValue.toCharArray();
final StringBuilder hex = new StringBuilder();
for (int i = 0; i < chars.length; i++) {
hex.append(Integer.toHexString(chars[i]));
}
return hex.toString();
}
public static String md5(String s) {
try {
final MessageDigest m = MessageDigest.getInstance("MD5");
m.update(s.getBytes(), 0, s.length());
final BigInteger i = new BigInteger(1, m.digest());
return String.format("%1$032x", i);
} catch (final NoSuchAlgorithmException e) {
LOG.error("call to md5() failed", e);
}
return null;
}
}