Java获取字符串16进制hash值

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {
private static MD5Util mInstance = null;

public static MD5Util getInstance() {
	if (mInstance == null) {
	mInstance = new MD5Util();
	}
	return mInstance;
}

/**
* 获取字符串16进制hash值
* @param input
* @return
*/
public String toHashHexStr(String input) {
	if (input == null || input.equals("")) {
	return null;
	}
	try {
	MessageDigest messageDigest = MessageDigest.getInstance("MD5");
	// 输入的字符串转换成字节数组
	byte[] inputByteArray = input.getBytes();
	// inputByteArray是输入字符串转换得到的字节数组
	messageDigest.update(inputByteArray);
	// 转换并返回结果，也是字节数组，包含16个元素
	byte[] resultByteArray = messageDigest.digest();
	// 字符数组转换成字符串返回
	return byteArrayToHex(resultByteArray);
	} catch (NoSuchAlgorithmException e) {
	e.printStackTrace();
	return null;
	}
}

private String byteArrayToHex(byte[] resultByteArray) {
	String hs = "";
	String stmp = "";
	for (int n = 0; n < resultByteArray.length; n++) {
	stmp = (java.lang.Integer.toHexString(resultByteArray[n] & 0XFF));
	if (stmp.length() == 1)
	hs = hs + "0" + stmp;
	else
	hs = hs + stmp;
	}
	return hs.toUpperCase();
}
}

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