com.njmd.framework.utils.EncodeUtil.java Source code

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Here is the source code for com.njmd.framework.utils.EncodeUtil.java

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/**
 * Copyright (c) 2005-2012 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.njmd.framework.utils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.security.MessageDigest;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.commons.lang3.Validate;

/**
 * ??????.
 * 
 * 1.Commons-Codec hex/base64 ? 2.longbase62?
 * 3.Commons-Langxml/html escape 4.JDK??URLEncoder
 * 
 * @author calvin
 */
public class EncodeUtil {
    private static final String ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    private static final String DEFAULT_URL_ENCODING = "UTF-8";

    private EncodeUtil() {

    }

    /**
     * MD5?
     */
    public static String encodeMD5(String s) {
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
        try {
            byte[] strTemp = s.getBytes();
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte[] md = mdTemp.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];
            }
            return new String(str);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * Hex?, byte[]->String.
     */
    public static String encodeHex(byte[] input) {
        return Hex.encodeHexString(input);
    }

    /**
     * Hex?, String->byte[].
     */
    public static byte[] decodeHex(String input) {
        try {
            return Hex.decodeHex(input.toCharArray());
        } catch (DecoderException e) {
            throw new IllegalStateException("Hex Decoder exception", e);
        }
    }

    /**
     * Base64?, byte[]->String.
     */
    public static String encodeBase64(byte[] input) {
        return Base64.encodeBase64String(input);
    }

    /**
     * Base64?, URL(Base64URL?'+''/''-''_', ?RFC3548).
     */
    public static String encodeUrlSafeBase64(byte[] input) {
        return Base64.encodeBase64URLSafeString(input);
    }

    /**
     * Base64?, String->byte[].
     */
    public static byte[] decodeBase64(String input) {
        return Base64.decodeBase64(input);
    }

    /**
     * Base62(0_9A_Za_z)?, long->String.
     */
    public static String encodeBase62(long num) {
        return alphabetEncode(num, 62);
    }

    /**
     * Base62(0_9A_Za_z)?, String->long.
     */
    public static long decodeBase62(String str) {
        return alphabetDecode(str, 62);
    }

    private static String alphabetEncode(long num, int base) {
        num = Math.abs(num);
        StringBuilder sb = new StringBuilder();
        for (; num > 0; num /= base) {
            sb.append(ALPHABET.charAt((int) (num % base)));
        }

        return sb.toString();
    }

    private static long alphabetDecode(String str, int base) {
        Validate.notBlank(str);

        long result = 0;
        for (int i = 0; i < str.length(); i++) {
            result += ALPHABET.indexOf(str.charAt(i)) * Math.pow(base, i);
        }

        return result;
    }

    /**
     * Html ?.
     */
    public static String escapeHtml(String html) {
        return StringEscapeUtils.escapeHtml4(html);
    }

    /**
     * Html ?.
     */
    public static String unescapeHtml(String htmlEscaped) {
        return StringEscapeUtils.unescapeHtml4(htmlEscaped);
    }

    /**
     * Xml ?.
     */
    public static String escapeXml(String xml) {
        return StringEscapeUtils.escapeXml(xml);
    }

    /**
     * Xml ?.
     */
    public static String unescapeXml(String xmlEscaped) {
        return StringEscapeUtils.unescapeXml(xmlEscaped);
    }

    /**
     * Csv ?.
     */
    public static String escapeCsv(String csv) {
        return StringEscapeUtils.escapeCsv(csv);
    }

    /**
     * Csv ?.
     */
    public static String unescapeCsv(String csvEscaped) {
        return StringEscapeUtils.unescapeCsv(csvEscaped);
    }

    /**
     * URL ?, EncodeUTF-8.
     */
    public static String urlEncode(String part) throws UnsupportedEncodingException {
        return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
    }

    /**
     * URL ?, EncodeUTF-8.
     */
    public static String urlDecode(String part) throws UnsupportedEncodingException {
        return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
    }
}