org.nlpcn.commons.lang.util.MD5 Maven / Gradle / Ivy

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package org.nlpcn.commons.lang.util;

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

public class MD5 {
	/**
	 * MD5加密类
	 * @param str 要加密的字符串
	 * @return    加密后的字符串
	 */
	public static String code(String str){
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(str.getBytes());
			byte[]byteDigest = md.digest();
			int i;
			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < byteDigest.length; offset++) {
				i = byteDigest[offset];
				if (i < 0)
					i += 256;
				if (i < 16)
					buf.append("0");
				buf.append(Integer.toHexString(i));
			}
			//32位加密
			return buf.toString();
			// 16位的加密
			//return buf.toString().substring(8, 24); 
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
			return null;
		}
		
	}
}