package com.boying.util;
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import org.springframework.util.DigestUtils;
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import java.math.BigInteger;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* MD5加密工具类
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*/
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public class MD5Util {
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public static String getMD5String(String str) {
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try {
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// 生成一个MD5加密计算摘要
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MessageDigest md = MessageDigest.getInstance("MD5");
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// 计算md5函数
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md.update(str.getBytes());
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// digest()最后确定返回md5 hash值，返回值为8位字符串。因为md5 hash值是16位的hex值，实际上就是8位的字符
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// BigInteger函数则将8位的字符串转换成16位hex值，用字符串来表示；得到字符串形式的hash值
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//一个byte是八位二进制，也就是2位十六进制字符（2的8次方等于16的2次方）
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return new BigInteger(1, md.digest()).toString(16);
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} catch (Exception e) {
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e.printStackTrace();
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return null;
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}
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}
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private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
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"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
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public static String byteArrayToHexString(byte[] b) {
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StringBuffer resultSb = new StringBuffer();
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for (int i = 0; i < b.length; i++) {
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resultSb.append(byteToHexString(b[i]));
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}
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return resultSb.toString();
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}
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private static String byteToHexString(byte b) {
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int n = b;
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if (n < 0)
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n = 256 + n;
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int d1 = n / 16;
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int d2 = n % 16;
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return hexDigits[d1] + hexDigits[d2];
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}
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/**
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* 加密
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*
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* @param origin
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* 原始字符串
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* @return 32位字符串
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*/
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public static String encode(String origin) {
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String resultString = null;
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try {
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resultString = new String(origin);
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MessageDigest md = MessageDigest.getInstance("MD5");
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resultString = byteArrayToHexString(md.digest(resultString
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.getBytes()));
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} catch (Exception ex) {
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System.out.println(ex);
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}
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return resultString;
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}
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/**
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*
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* @param origin
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* @param charsetname
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* @return
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*/
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public static String encode(String origin, String charsetname) {
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String resultString = null;
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try {
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resultString = new String(origin);
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MessageDigest md = MessageDigest.getInstance("MD5");
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if (charsetname == null || "".equals(charsetname))
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resultString = byteArrayToHexString(md.digest(resultString
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.getBytes()));
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else
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resultString = byteArrayToHexString(md.digest(resultString
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.getBytes(charsetname)));
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} catch (Exception exception) {
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}
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return resultString;
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}
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/**
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* 发短信加密使用
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*
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* @param source
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* @return
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*/
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public static String encrypt(String source) {
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if (source == null) {
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source = "";
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}
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String result = "";
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try {
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result = encrypt(source, "MD5");
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} catch (NoSuchAlgorithmException ex) {
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// this should never happen
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throw new RuntimeException(ex);
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}
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return result;
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}
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private static String encrypt(String source, String algorithm)
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throws NoSuchAlgorithmException {
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byte[] resByteArray = encrypt(source.getBytes(), algorithm);
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return toHexString(resByteArray);
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}
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private static byte[] encrypt(byte[] source, String algorithm)
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throws NoSuchAlgorithmException {
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MessageDigest md = MessageDigest.getInstance(algorithm);
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md.reset();
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md.update(source);
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return md.digest();
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}
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private static String toHexString(byte[] res) {
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StringBuffer sb = new StringBuffer(res.length << 1);
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for (int i = 0; i < res.length; i++) {
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String digit = Integer.toHexString(0xFF & res[i]);
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if (digit.length() == 1) {
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digit = '0' + digit;
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}
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sb.append(digit);
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}
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return sb.toString().toLowerCase();
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}
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public static void main(String[] args) {
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String s ="amt=1.00¬ifyUrl=http://test/payNotify&payKey=3ed6f127559e4f2f80e5e1cb0231b76b&payerName=tom&payerNum=54c51b276a9a47329b295662122968e1&payerTypeCode=130000451000011&paySecret=492f497a17cc41d19a757ae9d5809238";
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System.out.println(encode(s));
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String s2="amt=1.00¬ifyUrl=http://test/payNotify&payKey=3ed6f127559e4f2f80e5e1cb0231b76b&paySecret=492f497a17cc41d19a757ae9d5809238&payerName=峰峰&payerNum=3aa0f6499acb45f686b6442229d23b31&payerTypeCode=130000451000012";
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System.out.println(DigestUtils.md5DigestAsHex(s.toString().getBytes()));
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}
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}
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