TestMain.java

package com.subsidy.util;

import java.security.MessageDigest;
import java.util.Random;

public class TestMain {

    public static void main(String[] args) {
        String password = "123456";
        String saltCode = getRandomCharAndNumr(5);
        String encryptString = encrypt("91ebn" + password);
        System.out.println(encryptString);
    }

    public static String encrypt(String string) {

        String encryptedString = string;
        char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
        try {
            byte[] btInput = string.getBytes();
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char[] str = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            encryptedString = new String(str);
            return encryptedString;
        } catch (Exception e) {
            e.printStackTrace();
            return encryptedString;
        }
    }

    /**
     * 获取随机字母数字组合
     *
     * @param length
     *            字符串长度
     * @return
     */
    public static String getRandomCharAndNumr(Integer length) {
        String str = "";
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            boolean b = random.nextBoolean();
            if (b) { // 字符串
                // int choice = random.nextBoolean() ? 65 : 97; 取得65大写字母还是97小写字母
                str += (char) (97 + random.nextInt(26));// 取得大写字母
            } else { // 数字
                str += String.valueOf(random.nextInt(10));
            }
        }
        return str;
    }
}