SignerHelper.java

package com.feetao.web.utils;

import java.security.MessageDigest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SignerHelper {

	private static Logger logger = LoggerFactory.getLogger(SignerHelper.class);

	private static char md5String[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
	
	public static String MD5(String in) {
		try {
			byte[] btInput = in.getBytes();
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			mdInst.update(btInput);
			byte[] md = mdInst.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = md5String[byte0 >>> 4 & 0xf];
				str[k++] = md5String[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			logger.error(e.getMessage() , e);
		}
		return "";
	}
}