Md5加密算法

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在开发中遇到的实现Md5加密算法传入你想加密的数据调用该工具进行md5加密

代码如下：

package pro_util;import java.io.UnsupportedEncodingException;import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;/** * Created by 小林哥 on 2016/10/13. * md5加密工具 */public class Md5 {    /**     * Used building output as Hex     */    private static final char[] DIGITS = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',            'F' };    /**     * 对字符串进行MD5加密     *     * @param text     *     *     * @return 密文     */    public static String md5(String text, String charset) {        MessageDigest msgDigest = null;        try {            msgDigest = MessageDigest.getInstance("MD5");        } catch (NoSuchAlgorithmException e) {            throw new IllegalStateException("System doesn't support MD5 algorithm.");        }        try {            msgDigest.update(text.getBytes(charset));        } catch (UnsupportedEncodingException e) {            throw new IllegalStateException("System doesn't support your  EncodingException.");        }        byte[] bytes = msgDigest.digest();//    String md5Str = new String(encodeHex(bytes));        BigInteger bi = new BigInteger(1,bytes);        return bi.toString(16);    }    public static char[] encodeHex(byte[] data) {        int l = data.length;        char[] out = new char[l << 1];        // two characters form the hex value.        for (int i = 0, j = 0; i < l; i++) {            out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];            out[j++] = DIGITS[0x0F & data[i]];        }        return out;    }    public static void main(String[] args) {        // System.out.println(md5(md5("123456","utf-8"),"utf-8"));    }}

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