package com.changhong.epc.zuul.filter;
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import java.io.UnsupportedEncodingException;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/*
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* MD5 算法
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*/
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public class MD5 {
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static final Log log = LogFactory.getLog(MD5.class);
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// 全局数组
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private static final String[] strDigits = { "0", "1", "2", "3", "4", "5",
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"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
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private MD5(){
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}
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// 返回形式为数字跟字符串
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private static String byteToArrayString(byte bByte) {
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int iRet = bByte;
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if (iRet < 0) {
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iRet += 256;
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}
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int iD1 = iRet / 16;
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int iD2 = iRet % 16;
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return strDigits[iD1] + strDigits[iD2];
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}
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@SuppressWarnings("unused")
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private static String byteToNum(byte bByte) {
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int iRet = bByte;
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if (iRet < 0) {
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iRet += 256;
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}
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return String.valueOf(iRet);
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}
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// 转换字节数组为16进制字串
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private static String byteToString(byte[] bByte) {
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StringBuilder sBuffer = new StringBuilder();
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for (int i = 0; i < bByte.length; i++) {
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sBuffer.append(byteToArrayString(bByte[i]));
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}
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return sBuffer.toString();
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}
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public static String toMD5(String strObj) {
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log.debug(String.format("MD5加密前,参数为'%s'", strObj));
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String resultString = null;
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try {
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MessageDigest md = MessageDigest.getInstance("MD5");
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resultString = byteToString(md.digest(strObj.getBytes("UTF-8")));
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log.debug(String.format("MD5加密后,参数为'%s'", resultString));
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} catch (Exception e) {
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log.error(e.getMessage(), e);
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}
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return resultString;
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}
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}
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