<NME> Base64.java
<BEF> 

package com.egzosn.pay.common.util.sign.encrypt;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.IOException;

public final class Base64 {

    /**
     * Encodes hex octects into Base64
     *
     * @return Encoded Base64 array
     */
    public static String encode(byte[] binaryData) {
        return new String( new BASE64Encoder().encode(binaryData));
    }

    /**
     * @return Array containind decoded data.
     */
    public static byte[] decode(String encoded) {


        try {
            return  new BASE64Decoder().decodeBuffer(encoded);
        } catch (IOException e) {
            throw new RuntimeException(e.getMessage());
        }

    }

}

<MSG> 将jdk1.8的Base64移至项目

<DFF> @@ -1,14 +1,84 @@
-
+/*
+ * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
+ * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ *
+ */
 
 package com.egzosn.pay.common.util.sign.encrypt;
 
-import sun.misc.BASE64Decoder;
-import sun.misc.BASE64Encoder;
-
+import java.io.FilterOutputStream;
+import java.io.InputStream;
 import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Objects;
+
+/**
+ * This class consists exclusively of static methods for obtaining
+ * encoders and decoders for the Base64 encoding scheme. The
+ * implementation of this class supports the following types of Base64
+ * as specified in
+ * <a href="http://www.ietf.org/rfc/rfc4648.txt">RFC 4648</a> and
+ * <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>.
+ *
+ * <ul>
+ * <li><a name="basic"><b>Basic</b></a>
+ * <p> Uses "The Base64 Alphabet" as specified in Table 1 of
+ *     RFC 4648 and RFC 2045 for encoding and decoding operation.
+ *     The encoder does not add any line feed (line separator)
+ *     character. The decoder rejects data that contains characters
+ *     outside the base64 alphabet.</p></li>
+ *
+ * <li><a name="url"><b>URL and Filename safe</b></a>
+ * <p> Uses the "URL and Filename safe Base64 Alphabet" as specified
+ *     in Table 2 of RFC 4648 for encoding and decoding. The
+ *     encoder does not add any line feed (line separator) character.
+ *     The decoder rejects data that contains characters outside the
+ *     base64 alphabet.</p></li>
+ *
+ * <li><a name="mime"><b>MIME</b></a>
+ * <p> Uses the "The Base64 Alphabet" as specified in Table 1 of
+ *     RFC 2045 for encoding and decoding operation. The encoded output
+ *     must be represented in lines of no more than 76 characters each
+ *     and uses a carriage return {@code '\r'} followed immediately by
+ *     a linefeed {@code '\n'} as the line separator. No line separator
+ *     is added to the end of the encoded output. All line separators
+ *     or other characters not found in the base64 alphabet table are
+ *     ignored in decoding operation.</p></li>
+ * </ul>
+ *
+ * <p> Unless otherwise noted, passing a {@code null} argument to a
+ * method of this class will cause a {@link java.lang.NullPointerException
+ * NullPointerException} to be thrown.
+ *
+ * @author  Xueming Shen
+ * @since   1.8
+ */
 
-public final class Base64 {
+public class Base64 {
 
+    private Base64() {}
     /**
      * Encodes hex octects into Base64
      *
@@ -16,7 +86,7 @@ public final class Base64 {
      * @return Encoded Base64 array
      */
     public static String encode(byte[] binaryData) {
-        return new String( new BASE64Encoder().encode(binaryData));
+        return Base64.getEncoder().encodeToString(binaryData);
     }
 
     /**
@@ -26,14 +96,925 @@ public final class Base64 {
      * @return Array containind decoded data.
      */
     public static byte[] decode(String encoded) {
+        return Base64.getDecoder().decode(encoded);
+    }
+
 
+    /**
+     * Returns a {@link Encoder} that encodes using the
+     * <a href="#basic">Basic</a> type base64 encoding scheme.
+     *
+     * @return  A Base64 encoder.
+     */
+    public static Encoder getEncoder() {
+        return Encoder.RFC4648;
+    }
 
-        try {
-            return  new BASE64Decoder().decodeBuffer(encoded);
-        } catch (IOException e) {
-            throw new RuntimeException(e.getMessage());
+    /**
+     * Returns a {@link Encoder} that encodes using the
+     * <a href="#url">URL and Filename safe</a> type base64
+     * encoding scheme.
+     *
+     * @return  A Base64 encoder.
+     */
+    public static Encoder getUrlEncoder() {
+        return Encoder.RFC4648_URLSAFE;
+    }
+
+    /**
+     * Returns a {@link Encoder} that encodes using the
+     * <a href="#mime">MIME</a> type base64 encoding scheme.
+     *
+     * @return  A Base64 encoder.
+     */
+    public static Encoder getMimeEncoder() {
+        return Encoder.RFC2045;
+    }
+
+    /**
+     * Returns a {@link Encoder} that encodes using the
+     * <a href="#mime">MIME</a> type base64 encoding scheme
+     * with specified line length and line separators.
+     *
+     * @param   lineLength
+     *          the length of each output line (rounded down to nearest multiple
+     *          of 4). If {@code lineLength <= 0} the output will not be separated
+     *          in lines
+     * @param   lineSeparator
+     *          the line separator for each output line
+     *
+     * @return  A Base64 encoder.
+     *
+     * @throws  IllegalArgumentException if {@code lineSeparator} includes any
+     *          character of "The Base64 Alphabet" as specified in Table 1 of
+     *          RFC 2045.
+     */
+    public static Encoder getMimeEncoder(int lineLength, byte[] lineSeparator) {
+        Objects.requireNonNull(lineSeparator);
+        int[] base64 = Decoder.fromBase64;
+        for (byte b : lineSeparator) {
+            if (base64[b & 0xff] != -1)
+                throw new IllegalArgumentException(
+                        "Illegal base64 line separator character 0x" + Integer.toString(b, 16));
+        }
+        if (lineLength <= 0) {
+            return Encoder.RFC4648;
         }
+        return new Encoder(false, lineSeparator, lineLength >> 2 << 2, true);
+    }
 
+    /**
+     * Returns a {@link Decoder} that decodes using the
+     * <a href="#basic">Basic</a> type base64 encoding scheme.
+     *
+     * @return  A Base64 decoder.
+     */
+    public static Decoder getDecoder() {
+        return Decoder.RFC4648;
     }
 
+    /**
+     * Returns a {@link Decoder} that decodes using the
+     * <a href="#url">URL and Filename safe</a> type base64
+     * encoding scheme.
+     *
+     * @return  A Base64 decoder.
+     */
+    public static Decoder getUrlDecoder() {
+        return Decoder.RFC4648_URLSAFE;
+    }
+
+    /**
+     * Returns a {@link Decoder} that decodes using the
+     * <a href="#mime">MIME</a> type base64 decoding scheme.
+     *
+     * @return  A Base64 decoder.
+     */
+    public static Decoder getMimeDecoder() {
+        return Decoder.RFC2045;
+    }
+
+    /**
+     * This class implements an encoder for encoding byte data using
+     * the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
+     *
+     * <p> Instances of {@link Encoder} class are safe for use by
+     * multiple concurrent threads.
+     *
+     * <p> Unless otherwise noted, passing a {@code null} argument to
+     * a method of this class will cause a
+     * {@link java.lang.NullPointerException NullPointerException} to
+     * be thrown.
+     *
+     * @see     Decoder
+     * @since   1.8
+     */
+    public static class Encoder {
+
+        private final byte[] newline;
+        private final int linemax;
+        private final boolean isURL;
+        private final boolean doPadding;
+
+        private Encoder(boolean isURL, byte[] newline, int linemax, boolean doPadding) {
+            this.isURL = isURL;
+            this.newline = newline;
+            this.linemax = linemax;
+            this.doPadding = doPadding;
+        }
+
+        /**
+         * This array is a lookup table that translates 6-bit positive integer
+         * index values into their "Base64 Alphabet" equivalents as specified
+         * in "Table 1: The Base64 Alphabet" of RFC 2045 (and RFC 4648).
+         */
+        private static final char[] toBase64 = {
+                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+                'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+                'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
+        };
+
+        /**
+         * It's the lookup table for "URL and Filename safe Base64" as specified
+         * in Table 2 of the RFC 4648, with the '+' and '/' changed to '-' and
+         * '_'. This table is used when BASE64_URL is specified.
+         */
+        private static final char[] toBase64URL = {
+                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
+                'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
+                'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
+                '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
+        };
+
+        private static final int MIMELINEMAX = 76;
+        private static final byte[] CRLF = new byte[] {'\r', '\n'};
+
+        static final Encoder RFC4648 = new Encoder(false, null, -1, true);
+        static final Encoder RFC4648_URLSAFE = new Encoder(true, null, -1, true);
+        static final Encoder RFC2045 = new Encoder(false, CRLF, MIMELINEMAX, true);
+
+        private final int outLength(int srclen) {
+            int len = 0;
+            if (doPadding) {
+                len = 4 * ((srclen + 2) / 3);
+            } else {
+                int n = srclen % 3;
+                len = 4 * (srclen / 3) + (n == 0 ? 0 : n + 1);
+            }
+            if (linemax > 0)                                  // line separators
+                len += (len - 1) / linemax * newline.length;
+            return len;
+        }
+
+        /**
+         * Encodes all bytes from the specified byte array into a newly-allocated
+         * byte array using the {@link Base64} encoding scheme. The returned byte
+         * array is of the length of the resulting bytes.
+         *
+         * @param   src
+         *          the byte array to encode
+         * @return  A newly-allocated byte array containing the resulting
+         *          encoded bytes.
+         */
+        public byte[] encode(byte[] src) {
+            int len = outLength(src.length);          // dst array size
+            byte[] dst = new byte[len];
+            int ret = encode0(src, 0, src.length, dst);
+            if (ret != dst.length)
+                return Arrays.copyOf(dst, ret);
+            return dst;
+        }
+
+        /**
+         * Encodes all bytes from the specified byte array using the
+         * {@link Base64} encoding scheme, writing the resulting bytes to the
+         * given output byte array, starting at offset 0.
+         *
+         * <p> It is the responsibility of the invoker of this method to make
+         * sure the output byte array {@code dst} has enough space for encoding
+         * all bytes from the input byte array. No bytes will be written to the
+         * output byte array if the output byte array is not big enough.
+         *
+         * @param   src
+         *          the byte array to encode
+         * @param   dst
+         *          the output byte array
+         * @return  The number of bytes written to the output byte array
+         *
+         * @throws  IllegalArgumentException if {@code dst} does not have enough
+         *          space for encoding all input bytes.
+         */
+        public int encode(byte[] src, byte[] dst) {
+            int len = outLength(src.length);         // dst array size
+            if (dst.length < len)
+                throw new IllegalArgumentException(
+                        "Output byte array is too small for encoding all input bytes");
+            return encode0(src, 0, src.length, dst);
+        }
+
+        /**
+         * Encodes the specified byte array into a String using the {@link Base64}
+         * encoding scheme.
+         *
+         * <p> This method first encodes all input bytes into a base64 encoded
+         * byte array and then constructs a new String by using the encoded byte
+         * array and the {@link java.nio.charset.StandardCharsets#ISO_8859_1
+         * ISO-8859-1} charset.
+         *
+         * <p> In other words, an invocation of this method has exactly the same
+         * effect as invoking
+         * {@code new String(encode(src), StandardCharsets.ISO_8859_1)}.
+         *
+         * @param   src
+         *          the byte array to encode
+         * @return  A String containing the resulting Base64 encoded characters
+         */
+        @SuppressWarnings("deprecation")
+        public String encodeToString(byte[] src) {
+            byte[] encoded = encode(src);
+            return new String(encoded, 0, 0, encoded.length);
+        }
+
+        /**
+         * Encodes all remaining bytes from the specified byte buffer into
+         * a newly-allocated ByteBuffer using the {@link Base64} encoding
+         * scheme.
+         *
+         * Upon return, the source buffer's position will be updated to
+         * its limit; its limit will not have been changed. The returned
+         * output buffer's position will be zero and its limit will be the
+         * number of resulting encoded bytes.
+         *
+         * @param   buffer
+         *          the source ByteBuffer to encode
+         * @return  A newly-allocated byte buffer containing the encoded bytes.
+         */
+        public ByteBuffer encode(ByteBuffer buffer) {
+            int len = outLength(buffer.remaining());
+            byte[] dst = new byte[len];
+            int ret = 0;
+            if (buffer.hasArray()) {
+                ret = encode0(buffer.array(),
+                        buffer.arrayOffset() + buffer.position(),
+                        buffer.arrayOffset() + buffer.limit(),
+                        dst);
+                buffer.position(buffer.limit());
+            } else {
+                byte[] src = new byte[buffer.remaining()];
+                buffer.get(src);
+                ret = encode0(src, 0, src.length, dst);
+            }
+            if (ret != dst.length)
+                dst = Arrays.copyOf(dst, ret);
+            return ByteBuffer.wrap(dst);
+        }
+
+        /**
+         * Wraps an output stream for encoding byte data using the {@link Base64}
+         * encoding scheme.
+         *
+         * <p> It is recommended to promptly close the returned output stream after
+         * use, during which it will flush all possible leftover bytes to the underlying
+         * output stream. Closing the returned output stream will close the underlying
+         * output stream.
+         *
+         * @param   os
+         *          the output stream.
+         * @return  the output stream for encoding the byte data into the
+         *          specified Base64 encoded format
+         */
+        public OutputStream wrap(OutputStream os) {
+            Objects.requireNonNull(os);
+            return new EncOutputStream(os, isURL ? toBase64URL : toBase64,
+                    newline, linemax, doPadding);
+        }
+
+        /**
+         * Returns an encoder instance that encodes equivalently to this one,
+         * but without adding any padding character at the end of the encoded
+         * byte data.
+         *
+         * <p> The encoding scheme of this encoder instance is unaffected by
+         * this invocation. The returned encoder instance should be used for
+         * non-padding encoding operation.
+         *
+         * @return an equivalent encoder that encodes without adding any
+         *         padding character at the end
+         */
+        public Encoder withoutPadding() {
+            if (!doPadding)
+                return this;
+            return new Encoder(isURL, newline, linemax, false);
+        }
+
+        private int encode0(byte[] src, int off, int end, byte[] dst) {
+            char[] base64 = isURL ? toBase64URL : toBase64;
+            int sp = off;
+            int slen = (end - off) / 3 * 3;
+            int sl = off + slen;
+            if (linemax > 0 && slen  > linemax / 4 * 3)
+                slen = linemax / 4 * 3;
+            int dp = 0;
+            while (sp < sl) {
+                int sl0 = Math.min(sp + slen, sl);
+                for (int sp0 = sp, dp0 = dp ; sp0 < sl0; ) {
+                    int bits = (src[sp0++] & 0xff) << 16 |
+                            (src[sp0++] & 0xff) <<  8 |
+                            (src[sp0++] & 0xff);
+                    dst[dp0++] = (byte)base64[(bits >>> 18) & 0x3f];
+                    dst[dp0++] = (byte)base64[(bits >>> 12) & 0x3f];
+                    dst[dp0++] = (byte)base64[(bits >>> 6)  & 0x3f];
+                    dst[dp0++] = (byte)base64[bits & 0x3f];
+                }
+                int dlen = (sl0 - sp) / 3 * 4;
+                dp += dlen;
+                sp = sl0;
+                if (dlen == linemax && sp < end) {
+                    for (byte b : newline){
+                        dst[dp++] = b;
+                    }
+                }
+            }
+            if (sp < end) {               // 1 or 2 leftover bytes
+                int b0 = src[sp++] & 0xff;
+                dst[dp++] = (byte)base64[b0 >> 2];
+                if (sp == end) {
+                    dst[dp++] = (byte)base64[(b0 << 4) & 0x3f];
+                    if (doPadding) {
+                        dst[dp++] = '=';
+                        dst[dp++] = '=';
+                    }
+                } else {
+                    int b1 = src[sp++] & 0xff;
+                    dst[dp++] = (byte)base64[(b0 << 4) & 0x3f | (b1 >> 4)];
+                    dst[dp++] = (byte)base64[(b1 << 2) & 0x3f];
+                    if (doPadding) {
+                        dst[dp++] = '=';
+                    }
+                }
+            }
+            return dp;
+        }
+    }
+
+    /**
+     * This class implements a decoder for decoding byte data using the
+     * Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
+     *
+     * <p> The Base64 padding character {@code '='} is accepted and
+     * interpreted as the end of the encoded byte data, but is not
+     * required. So if the final unit of the encoded byte data only has
+     * two or three Base64 characters (without the corresponding padding
+     * character(s) padded), they are decoded as if followed by padding
+     * character(s). If there is a padding character present in the
+     * final unit, the correct number of padding character(s) must be
+     * present, otherwise {@code IllegalArgumentException} (
+     * {@code IOException} when reading from a Base64 stream) is thrown
+     * during decoding.
+     *
+     * <p> Instances of {@link Decoder} class are safe for use by
+     * multiple concurrent threads.
+     *
+     * <p> Unless otherwise noted, passing a {@code null} argument to
+     * a method of this class will cause a
+     * {@link java.lang.NullPointerException NullPointerException} to
+     * be thrown.
+     *
+     * @see     Encoder
+     * @since   1.8
+     */
+    public static class Decoder {
+
+        private final boolean isURL;
+        private final boolean isMIME;
+
+        private Decoder(boolean isURL, boolean isMIME) {
+            this.isURL = isURL;
+            this.isMIME = isMIME;
+        }
+
+        /**
+         * Lookup table for decoding unicode characters drawn from the
+         * "Base64 Alphabet" (as specified in Table 1 of RFC 2045) into
+         * their 6-bit positive integer equivalents.  Characters that
+         * are not in the Base64 alphabet but fall within the bounds of
+         * the array are encoded to -1.
+         *
+         */
+        private static final int[] fromBase64 = new int[256];
+        static {
+            Arrays.fill(fromBase64, -1);
+            for (int i = 0; i < Encoder.toBase64.length; i++)
+                fromBase64[Encoder.toBase64[i]] = i;
+            fromBase64['='] = -2;
+        }
+
+        /**
+         * Lookup table for decoding "URL and Filename safe Base64 Alphabet"
+         * as specified in Table2 of the RFC 4648.
+         */
+        private static final int[] fromBase64URL = new int[256];
+
+        static {
+            Arrays.fill(fromBase64URL, -1);
+            for (int i = 0; i < Encoder.toBase64URL.length; i++)
+                fromBase64URL[Encoder.toBase64URL[i]] = i;
+            fromBase64URL['='] = -2;
+        }
+
+        static final Decoder RFC4648         = new Decoder(false, false);
+        static final Decoder RFC4648_URLSAFE = new Decoder(true, false);
+        static final Decoder RFC2045         = new Decoder(false, true);
+
+        /**
+         * Decodes all bytes from the input byte array using the {@link Base64}
+         * encoding scheme, writing the results into a newly-allocated output
+         * byte array. The returned byte array is of the length of the resulting
+         * bytes.
+         *
+         * @param   src
+         *          the byte array to decode
+         *
+         * @return  A newly-allocated byte array containing the decoded bytes.
+         *
+         * @throws  IllegalArgumentException
+         *          if {@code src} is not in valid Base64 scheme
+         */
+        public byte[] decode(byte[] src) {
+            byte[] dst = new byte[outLength(src, 0, src.length)];
+            int ret = decode0(src, 0, src.length, dst);
+            if (ret != dst.length) {
+                dst = Arrays.copyOf(dst, ret);
+            }
+            return dst;
+        }
+
+        /**
+         * Decodes a Base64 encoded String into a newly-allocated byte array
+         * using the {@link Base64} encoding scheme.
+         *
+         * <p> An invocation of this method has exactly the same effect as invoking
+         * {@code decode(src.getBytes(StandardCharsets.ISO_8859_1))}
+         *
+         * @param   src
+         *          the string to decode
+         *
+         * @return  A newly-allocated byte array containing the decoded bytes.
+         *
+         * @throws  IllegalArgumentException
+         *          if {@code src} is not in valid Base64 scheme
+         */
+        public byte[] decode(String src) {
+            return decode(src.getBytes(StandardCharsets.ISO_8859_1));
+        }
+
+        /**
+         * Decodes all bytes from the input byte array using the {@link Base64}
+         * encoding scheme, writing the results into the given output byte array,
+         * starting at offset 0.
+         *
+         * <p> It is the responsibility of the invoker of this method to make
+         * sure the output byte array {@code dst} has enough space for decoding
+         * all bytes from the input byte array. No bytes will be be written to
+         * the output byte array if the output byte array is not big enough.
+         *
+         * <p> If the input byte array is not in valid Base64 encoding scheme
+         * then some bytes may have been written to the output byte array before
+         * IllegalargumentException is thrown.
+         *
+         * @param   src
+         *          the byte array to decode
+         * @param   dst
+         *          the output byte array
+         *
+         * @return  The number of bytes written to the output byte array
+         *
+         * @throws  IllegalArgumentException
+         *          if {@code src} is not in valid Base64 scheme, or {@code dst}
+         *          does not have enough space for decoding all input bytes.
+         */
+        public int decode(byte[] src, byte[] dst) {
+            int len = outLength(src, 0, src.length);
+            if (dst.length < len)
+                throw new IllegalArgumentException(
+                        "Output byte array is too small for decoding all input bytes");
+            return decode0(src, 0, src.length, dst);
+        }
+
+        /**
+         * Decodes all bytes from the input byte buffer using the {@link Base64}
+         * encoding scheme, writing the results into a newly-allocated ByteBuffer.
+         *
+         * <p> Upon return, the source buffer's position will be updated to
+         * its limit; its limit will not have been changed. The returned
+         * output buffer's position will be zero and its limit will be the
+         * number of resulting decoded bytes
+         *
+         * <p> {@code IllegalArgumentException} is thrown if the input buffer
+         * is not in valid Base64 encoding scheme. The position of the input
+         * buffer will not be advanced in this case.
+         *
+         * @param   buffer
+         *          the ByteBuffer to decode
+         *
+         * @return  A newly-allocated byte buffer containing the decoded bytes
+         *
+         * @throws  IllegalArgumentException
+         *          if {@code src} is not in valid Base64 scheme.
+         */
+        public ByteBuffer decode(ByteBuffer buffer) {
+            int pos0 = buffer.position();
+            try {
+                byte[] src;
+                int sp, sl;
+                if (buffer.hasArray()) {
+                    src = buffer.array();
+                    sp = buffer.arrayOffset() + buffer.position();
+                    sl = buffer.arrayOffset() + buffer.limit();
+                    buffer.position(buffer.limit());
+                } else {
+                    src = new byte[buffer.remaining()];
+                    buffer.get(src);
+                    sp = 0;
+                    sl = src.length;
+                }
+                byte[] dst = new byte[outLength(src, sp, sl)];
+                return ByteBuffer.wrap(dst, 0, decode0(src, sp, sl, dst));
+            } catch (IllegalArgumentException iae) {
+                buffer.position(pos0);
+                throw iae;
+            }
+        }
+
+        /**
+         * Returns an input stream for decoding {@link Base64} encoded byte stream.
+         *
+         * <p> The {@code read}  methods of the returned {@code InputStream} will
+         * throw {@code IOException} when reading bytes that cannot be decoded.
+         *
+         * <p> Closing the returned input stream will close the underlying
+         * input stream.
+         *
+         * @param   is
+         *          the input stream
+         *
+         * @return  the input stream for decoding the specified Base64 encoded
+         *          byte stream
+         */
+        public InputStream wrap(InputStream is) {
+            Objects.requireNonNull(is);
+            return new DecInputStream(is, isURL ? fromBase64URL : fromBase64, isMIME);
+        }
+
+        private int outLength(byte[] src, int sp, int sl) {
+            int[] base64 = isURL ? fromBase64URL : fromBase64;
+            int paddings = 0;
+            int len = sl - sp;
+            if (len == 0)
+                return 0;
+            if (len < 2) {
+                if (isMIME && base64[0] == -1)
+                    return 0;
+                throw new IllegalArgumentException(
+                        "Input byte[] should at least have 2 bytes for base64 bytes");
+            }
+            if (isMIME) {
+                // scan all bytes to fill out all non-alphabet. a performance
+                // trade-off of pre-scan or Arrays.copyOf
+                int n = 0;
+                while (sp < sl) {
+                    int b = src[sp++] & 0xff;
+                    if (b == '=') {
+                        len -= (sl - sp + 1);
+                        break;
+                    }
+                    if ((b = base64[b]) == -1)
+                        n++;
+                }
+                len -= n;
+            } else {
+                if (src[sl - 1] == '=') {
+                    paddings++;
+                    if (src[sl - 2] == '=')
+                        paddings++;
+                }
+            }
+            if (paddings == 0 && (len & 0x3) !=  0)
+                paddings = 4 - (len & 0x3);
+            return 3 * ((len + 3) / 4) - paddings;
+        }
+
+        private int decode0(byte[] src, int sp, int sl, byte[] dst) {
+            int[] base64 = isURL ? fromBase64URL : fromBase64;
+            int dp = 0;
+            int bits = 0;
+            int shiftto = 18;       // pos of first byte of 4-byte atom
+            while (sp < sl) {
+                int b = src[sp++] & 0xff;
+                if ((b = base64[b]) < 0) {
+                    if (b == -2) {         // padding byte '='
+                        // =     shiftto==18 unnecessary padding
+                        // x=    shiftto==12 a dangling single x
+                        // x     to be handled together with non-padding case
+                        // xx=   shiftto==6&&sp==sl missing last =
+                        // xx=y  shiftto==6 last is not =
+                        if (shiftto == 6 && (sp == sl || src[sp++] != '=') ||
+                                shiftto == 18) {
+                            throw new IllegalArgumentException(
+                                    "Input byte array has wrong 4-byte ending unit");
+                        }
+                        break;
+                    }
+                    if (isMIME)    // skip if for rfc2045
+                        continue;
+                    else
+                        throw new IllegalArgumentException(
+                                "Illegal base64 character " +
+                                        Integer.toString(src[sp - 1], 16));
+                }
+                bits |= (b << shiftto);
+                shiftto -= 6;
+                if (shiftto < 0) {
+                    dst[dp++] = (byte)(bits >> 16);
+                    dst[dp++] = (byte)(bits >>  8);
+                    dst[dp++] = (byte)(bits);
+                    shiftto = 18;
+                    bits = 0;
+                }
+            }
+            // reached end of byte array or hit padding '=' characters.
+            if (shiftto == 6) {
+                dst[dp++] = (byte)(bits >> 16);
+            } else if (shiftto == 0) {
+                dst[dp++] = (byte)(bits >> 16);
+                dst[dp++] = (byte)(bits >>  8);
+            } else if (shiftto == 12) {
+                // dangling single "x", incorrectly encoded.
+                throw new IllegalArgumentException(
+                        "Last unit does not have enough valid bits");
+            }
+            // anything left is invalid, if is not MIME.
+            // if MIME, ignore all non-base64 character
+            while (sp < sl) {
+                if (isMIME && base64[src[sp++]] < 0)
+                    continue;
+                throw new IllegalArgumentException(
+                        "Input byte array has incorrect ending byte at " + sp);
+            }
+            return dp;
+        }
+    }
+
+    /*
+     * An output stream for encoding bytes into the Base64.
+     */
+    private static class EncOutputStream extends FilterOutputStream {
+
+        private int leftover = 0;
+        private int b0, b1, b2;
+        private boolean closed = false;
+
+        private final char[] base64;    // byte->base64 mapping
+        private final byte[] newline;   // line separator, if needed
+        private final int linemax;
+        private final boolean doPadding;// whether or not to pad
+        private int linepos = 0;
+
+        EncOutputStream(OutputStream os, char[] base64,
+                        byte[] newline, int linemax, boolean doPadding) {
+            super(os);
+            this.base64 = base64;
+            this.newline = newline;
+            this.linemax = linemax;
+            this.doPadding = doPadding;
+        }
+
+        @Override
+        public void write(int b) throws IOException {
+            byte[] buf = new byte[1];
+            buf[0] = (byte)(b & 0xff);
+            write(buf, 0, 1);
+        }
+
+        private void checkNewline() throws IOException {
+            if (linepos == linemax) {
+                out.write(newline);
+                linepos = 0;
+            }
+        }
+
+        @Override
+        public void write(byte[] b, int off, int len) throws IOException {
+            if (closed)
+                throw new IOException("Stream is closed");
+            if (off < 0 || len < 0 || off + len > b.length)
+                throw new ArrayIndexOutOfBoundsException();
+            if (len == 0)
+                return;
+            if (leftover != 0) {
+                if (leftover == 1) {
+                    b1 = b[off++] & 0xff;
+                    len--;
+                    if (len == 0) {
+                        leftover++;
+                        return;
+                    }
+                }
+                b2 = b[off++] & 0xff;
+                len--;
+                checkNewline();
+                out.write(base64[b0 >> 2]);
+                out.write(base64[(b0 << 4) & 0x3f | (b1 >> 4)]);
+                out.write(base64[(b1 << 2) & 0x3f | (b2 >> 6)]);
+                out.write(base64[b2 & 0x3f]);
+                linepos += 4;
+            }
+            int nBits24 = len / 3;
+            leftover = len - (nBits24 * 3);
+            while (nBits24-- > 0) {
+                checkNewline();
+                int bits = (b[off++] & 0xff) << 16 |
+                        (b[off++] & 0xff) <<  8 |
+                        (b[off++] & 0xff);
+                out.write(base64[(bits >>> 18) & 0x3f]);
+                out.write(base64[(bits >>> 12) & 0x3f]);
+                out.write(base64[(bits >>> 6)  & 0x3f]);
+                out.write(base64[bits & 0x3f]);
+                linepos += 4;
+            }
+            if (leftover == 1) {
+                b0 = b[off++] & 0xff;
+            } else if (leftover == 2) {
+                b0 = b[off++] & 0xff;
+                b1 = b[off++] & 0xff;
+            }
+        }
+
+        @Override
+        public void close() throws IOException {
+            if (!closed) {
+                closed = true;
+                if (leftover == 1) {
+                    checkNewline();
+                    out.write(base64[b0 >> 2]);
+                    out.write(base64[(b0 << 4) & 0x3f]);
+                    if (doPadding) {
+                        out.write('=');
+                        out.write('=');
+                    }
+                } else if (leftover == 2) {
+                    checkNewline();
+                    out.write(base64[b0 >> 2]);
+                    out.write(base64[(b0 << 4) & 0x3f | (b1 >> 4)]);
+                    out.write(base64[(b1 << 2) & 0x3f]);
+                    if (doPadding) {
+                        out.write('=');
+                    }
+                }
+                leftover = 0;
+                out.close();
+            }
+        }
+    }
+
+    /*
+     * An input stream for decoding Base64 bytes
+     */
+    private static class DecInputStream extends InputStream {
+
+        private final InputStream is;
+        private final boolean isMIME;
+        private final int[] base64;      // base64 -> byte mapping
+        private int bits = 0;            // 24-bit buffer for decoding
+        private int nextin = 18;         // next available "off" in "bits" for input;
+        // -> 18, 12, 6, 0
+        private int nextout = -8;        // next available "off" in "bits" for output;
+        // -> 8, 0, -8 (no byte for output)
+        private boolean eof = false;
+        private boolean closed = false;
+
+        DecInputStream(InputStream is, int[] base64, boolean isMIME) {
+            this.is = is;
+            this.base64 = base64;
+            this.isMIME = isMIME;
+        }
+
+        private byte[] sbBuf = new byte[1];
+
+        @Override
+        public int read() throws IOException {
+            return read(sbBuf, 0, 1) == -1 ? -1 : sbBuf[0] & 0xff;
+        }
+
+        @Override
+        public int read(byte[] b, int off, int len) throws IOException {
+            if (closed)
+                throw new IOException("Stream is closed");
+            if (eof && nextout < 0)    // eof and no leftover
+                return -1;
+            if (off < 0 || len < 0 || len > b.length - off)
+                throw new IndexOutOfBoundsException();
+            int oldOff = off;
+            if (nextout >= 0) {       // leftover output byte(s) in bits buf
+                do {
+                    if (len == 0)
+                        return off - oldOff;
+                    b[off++] = (byte)(bits >> nextout);
+                    len--;
+                    nextout -= 8;
+                } while (nextout >= 0);
+                bits = 0;
+            }
+            while (len > 0) {
+                int v = is.read();
+                if (v == -1) {
+                    eof = true;
+                    if (nextin != 18) {
+                        if (nextin == 12)
+                            throw new IOException("Base64 stream has one un-decoded dangling byte.");
+                        // treat ending xx/xxx without padding character legal.
+                        // same logic as v == '=' below
+                        b[off++] = (byte)(bits >> (16));
+                        len--;
+                        if (nextin == 0) {           // only one padding byte
+                            if (len == 0) {          // no enough output space
+                                bits >>= 8;          // shift to lowest byte
+                                nextout = 0;
+                            } else {
+                                b[off++] = (byte) (bits >>  8);
+                            }
+                        }
+                    }
+                    if (off == oldOff)
+                        return -1;
+                    else
+                        return off - oldOff;
+                }
+                if (v == '=') {                  // padding byte(s)
+                    // =     shiftto==18 unnecessary padding
+                    // x=    shiftto==12 dangling x, invalid unit
+                    // xx=   shiftto==6 && missing last '='
+                    // xx=y  or last is not '='
+                    if (nextin == 18 || nextin == 12 ||
+                            nextin == 6 && is.read() != '=') {
+                        throw new IOException("Illegal base64 ending sequence:" + nextin);
+                    }
+                    b[off++] = (byte)(bits >> (16));
+                    len--;
+                    if (nextin == 0) {           // only one padding byte
+                        if (len == 0) {          // no enough output space
+                            bits >>= 8;          // shift to lowest byte
+                            nextout = 0;
+                        } else {
+                            b[off++] = (byte) (bits >>  8);
+                        }
+                    }
+                    eof = true;
+                    break;
+                }
+                if ((v = base64[v]) == -1) {
+                    if (isMIME)                 // skip if for rfc2045
+                        continue;
+                    else
+                        throw new IOException("Illegal base64 character " +
+                                Integer.toString(v, 16));
+                }
+                bits |= (v << nextin);
+                if (nextin == 0) {
+                    nextin = 18;    // clear for next
+                    nextout = 16;
+                    while (nextout >= 0) {
+                        b[off++] = (byte)(bits >> nextout);
+                        len--;
+                        nextout -= 8;
+                        if (len == 0 && nextout >= 0) {  // don't clean "bits"
+                            return off - oldOff;
+                        }
+                    }
+                    bits = 0;
+                } else {
+                    nextin -= 6;
+                }
+            }
+            return off - oldOff;
+        }
+
+        @Override
+        public int available() throws IOException {
+            if (closed)
+                throw new IOException("Stream is closed");
+            return is.available();   // TBD:
+        }
+
+        @Override
+        public void close() throws IOException {
+            if (!closed) {
+                closed = true;
+                is.close();
+            }
+        }
+    }
 }

将jdk1.8的Base64移至项目