MD5

package com.nier.utils;

import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util2 {
	/**
	 * 使用md5的算法进行加密
	 */
	public static String md5(String plainText) throws UnsupportedEncodingException {
		byte[] secretBytes = null;
		try {
			//StandardCharsets.UTF_8 可以替换 "utf-8"
			secretBytes = MessageDigest.getInstance("md5").digest(
					plainText.getBytes("utf-8"));
		} catch (NoSuchAlgorithmException e) {
			throw new RuntimeException("没有md5这个算法！");
		}
		StringBuilder md5code = new StringBuilder(new BigInteger(1, secretBytes).toString(16));// 16进制数字
		// 如果生成数字未满32位，需要前面补0
		for (int i = 0; i < 32 - md5code.length(); i++) {
			md5code.insert(0, "0");
		}
		return md5code.toString();
	}

	public static void main(String[] args) throws UnsupportedEncodingException {
		for (int i = 0; i < 8; i++) {
			//36a95acd09fcaa4bcb645ccd82a87859
			System.out.println(md5("yunuotianming"));
		}

	}

}