Java实现MD5加密

package util;

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

/**
 * MD5加密
 * 
 * @author baiyang
 * 
 */
public class MD5 {
	/**
	 * 加密字符串
	 * 
	 * @params 待加密字符串
	 * @return 加密后的结果
	 */
	public static String getMD5(String s) {
		StringBuilder buf = newStringBuilder("");
		MessageDigest md = null;
		try {
			md = MessageDigest.getInstance("MD5");
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		md.update(s.getBytes());
		byte b[] = md.digest();
		int i;
		for (int offset = 0; offset < b.length; offset++) {
			i = b[offset];
			if (i < 0) {
				i += 256;
			}
			if (i < 16) {
				buf.append("0");
			}
			buf.append(Integer.toHexString(i));
		}
		return buf.toString().toUpperCase();
	}
}