java MD5加密

参考文章：http://warren.iteye.com/blog/107386

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package tools;

import java.security.MessageDigest;

import org.junit.Test;

import sun.misc.BASE64Encoder;

public class MD5 {

	@Test
	public void TestMD5()
	{
		System.out.println("MD5加密结果:"+getMD5("123456"));
		System.out.println("MD5加密结果:"+getMD5ByBase64("123456"));

		System.out.println("MD5加密结果:"+getMD5("qq2014"));
		System.out.println("MD5加密结果:"+getMD5("baidu2014"));
		System.out.println("MD5加密结果:"+getMD5("md5123456"));
		System.out.println("MD5加密结果:"+getMD5("北京天安门"));
	}

	/**
	 * MD5加密
	 * @param message 要进行MD5加密的字符串
	 * @return 加密结果为32位字符串
	 */
	public static String getMD5(String message) {
		MessageDigest messageDigest = null;
		StringBuffer md5StrBuff = new StringBuffer();
		try {
			messageDigest = MessageDigest.getInstance("MD5");
			messageDigest.reset();
			messageDigest.update(message.getBytes("UTF-8"));

			byte[] byteArray = messageDigest.digest();
			for (int i = 0; i < byteArray.length; i++) 
			{
				if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
					md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
				else
					md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
			}
		} catch (Exception e) {
			throw new RuntimeException();
		}
		return md5StrBuff.toString().toUpperCase();//字母大写
	}

	/**
	 * MD5加密,加密结果采用Base64进行编码
	 * @param message 要进行MD5加密的字符串
	 * @return
	 */
	public static String getMD5ByBase64(String message) {
		MessageDigest md= null;
		try {
			md= MessageDigest.getInstance("MD5");
			byte md5[]=md.digest(message.getBytes());
			BASE64Encoder base64=new BASE64Encoder();
			return base64.encode(md5);
		} catch (Exception e) {
			throw new RuntimeException();
		}
	}

}

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