com.bjwg.back.util.EncodeUtils.java Source code

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Here is the source code for com.bjwg.back.util.EncodeUtils.java

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package com.bjwg.back.util;

/**
 * Copyright (c) 2005-2011 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 
 * $Id: EncodeUtils.java 1595 2011-05-11 16:41:16Z calvinxiu $
 */
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

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

/**
 * 
 * @author calvin
 */
public abstract class EncodeUtils {
    private static final String ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

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

    public static String encodeHex(byte[] input) {
        return Hex.encodeHexString(input);
    }

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

    public static String encodeBase64(byte[] input) {
        return Base64.encodeBase64String(input);
    }

    public static String encodeUrlSafeBase64(byte[] input) {
        return Base64.encodeBase64URLSafeString(input);
    }

    public static byte[] decodeBase64(String input) {
        return Base64.decodeBase64(input);
    }

    public static String encodeBase62(long num) {
        return alphabetEncode(num, 62);
    }

    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) {
        AssertUtils.hasText(str);

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

        return result;
    }

    public static String urlEncode(String part) {
        try {
            return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {
            return "";
        }
    }

    public static String urlDecode(String part) {

        try {
            return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
        } catch (UnsupportedEncodingException e) {
            return "";
        }
    }

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

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

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

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