com.lakeside.core.utils.EncodeUtils.java Source code

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Here is the source code for com.lakeside.core.utils.EncodeUtils.java

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/**
 * Copyright (c) 2005-2009 springside.org.cn
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 
 */
package com.lakeside.core.utils;

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

import com.google.common.io.BaseEncoding;

/**
 * ?????.
 * 
 * ?Commons-Codec,Commons-Lang?JDK???.
 * 
 */
public class EncodeUtils {

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

    /**
     * Used to build output as Hex
     */
    private static final char[] DIGITS_LOWER = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c',
            'd', 'e', 'f' };

    /**
     * Used to build output as Hex
     */
    private static final char[] DIGITS_UPPER = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
            'D', 'E', 'F' };

    /**
     * Hex?.
     */
    public static String hexEncode(byte[] data) {
        return hexEncode(data, true);
    }

    /**
     * Hex?.
     */
    public static String hexEncode(byte[] data, boolean toLowerCase) {
        char[] toDigits = toLowerCase ? DIGITS_LOWER : DIGITS_UPPER;
        int l = data.length;
        char[] out = new char[l << 1];
        // two characters form the hex value.
        for (int i = 0, j = 0; i < l; i++) {
            out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
            out[j++] = toDigits[0x0F & data[i]];
        }
        return new String(out);
    }

    /**
     * Hex?.
     */
    public static byte[] hexDecode(String input) {
        char[] data = input.toCharArray();
        int len = data.length;

        if ((len & 0x01) != 0) {
            throw new RuntimeException("Odd number of characters.");
        }

        byte[] out = new byte[len >> 1];

        // two characters form the hex value.
        for (int i = 0, j = 0; j < len; i++) {
            int f = toDigit(data[j], j) << 4;
            j++;
            f = f | toDigit(data[j], j);
            j++;
            out[i] = (byte) (f & 0xFF);
        }

        return out;
    }

    protected static int toDigit(char ch, int index) {
        int digit = Character.digit(ch, 16);
        if (digit == -1) {
            throw new RuntimeException("Illegal hexadecimal character " + ch + " at index " + index);
        }
        return digit;
    }

    /**
     * Base64?.
     */
    public static String base64Encode(byte[] input) {
        return new String(BaseEncoding.base64().encode(input));
    }

    /**
     * Base64?, URL(Base64URL?+,/=, ?RFC3548).
     */
    public static String base64UrlSafeEncode(byte[] input) {
        return BaseEncoding.base64Url().encode(input);
    }

    /**
     * Base64?.
     */
    public static byte[] base64Decode(String input) {
        return BaseEncoding.base64().decode(input);
    }

    /**
     * URL ?, EncodeUTF-8. 
     */
    public static String urlEncode(String input) {
        return urlEncode(input, DEFAULT_URL_ENCODING);
    }

    /**
     * URL ?.
     */
    public static String urlEncode(String input, String encoding) {
        try {
            return URLEncoder.encode(input, encoding);
        } catch (UnsupportedEncodingException e) {
            throw new IllegalArgumentException("Unsupported Encoding Exception", e);
        }
    }

    /**
     * URL ?, EncodeUTF-8. 
     */
    public static String urlDecode(String input) {
        return urlDecode(input, DEFAULT_URL_ENCODING);
    }

    /**
     * URL ?.
     */
    public static String urlDecode(String input, String encoding) {
        try {
            return URLDecoder.decode(input, encoding);
        } catch (UnsupportedEncodingException e) {
            throw new IllegalArgumentException("Unsupported Encoding Exception", e);
        }
    }
}