base64.html

IText PDF开发工具说明文档,使用很方便。

   GZIP: gzip-compresses object before encoding it.
   DONT_BREAK_LINES: don't break lines at 76 characters
     <i>Note: Technically, this makes your encoding non-compliant.</i>
 </pre>
 <p>
 Example: <code>encodeBytes( myData, Base64.GZIP )</code> or
 <p>
 Example: <code>encodeBytes( myData, Base64.GZIP | Base64.DONT_BREAK_LINES )</code>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - The data to convert<DD><CODE>off</CODE> - Offset in array where conversion should begin<DD><CODE>len</CODE> - Length of data to convert<DD><CODE>options</CODE> - Specified options
                alphabet type is pulled from this (standard, url-safe, ordered)<DT><B>Since:</B></DT>
  <DD>2.0</DD>
<DT><B>See Also:</B><DD><A HREF="../../../../../com/lowagie/text/pdf/codec/Base64.html#GZIP"><CODE>GZIP</CODE></A>, 
<A HREF="../../../../../com/lowagie/text/pdf/codec/Base64.html#DONT_BREAK_LINES"><CODE>DONT_BREAK_LINES</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="decode4to3(byte[], int, byte[], int, int)"><!-- --></A><H3>
decode4to3</H3>
<PRE>
private static int <B>decode4to3</B>(byte[]&nbsp;source,
                              int&nbsp;srcOffset,
                              byte[]&nbsp;destination,
                              int&nbsp;destOffset,
                              int&nbsp;options)</PRE>
<DL>
<DD>Decodes four bytes from array <var>source</var>
 and writes the resulting bytes (up to three of them)
 to <var>destination</var>.
 The source and destination arrays can be manipulated
 anywhere along their length by specifying
 <var>srcOffset</var> and <var>destOffset</var>.
 This method does not check to make sure your arrays
 are large enough to accomodate <var>srcOffset</var> + 4 for
 the <var>source</var> array or <var>destOffset</var> + 3 for
 the <var>destination</var> array.
 This method returns the actual number of bytes that
 were converted from the Base64 encoding.
 <p>This is the lowest level of the decoding methods with
 all possible parameters.</p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - the array to convert<DD><CODE>srcOffset</CODE> - the index where conversion begins<DD><CODE>destination</CODE> - the array to hold the conversion<DD><CODE>destOffset</CODE> - the index where output will be put<DD><CODE>options</CODE> - alphabet type is pulled from this (standard, url-safe, ordered)
<DT><B>Returns:</B><DD>the number of decoded bytes converted<DT><B>Since:</B></DT>
  <DD>1.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decode(byte[], int, int, int)"><!-- --></A><H3>
decode</H3>
<PRE>
public static byte[] <B>decode</B>(byte[]&nbsp;source,
                            int&nbsp;off,
                            int&nbsp;len,
                            int&nbsp;options)</PRE>
<DL>
<DD>Very low-level access to decoding ASCII characters in
 the form of a byte array. Does not support automatically
 gunzipping or any other "fancy" features.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>source</CODE> - The Base64 encoded data<DD><CODE>off</CODE> - The offset of where to begin decoding<DD><CODE>len</CODE> - The length of characters to decode
<DT><B>Returns:</B><DD>decoded data<DT><B>Since:</B></DT>
  <DD>1.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decode(java.lang.String)"><!-- --></A><H3>
decode</H3>
<PRE>
public static byte[] <B>decode</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;s)</PRE>
<DL>
<DD>Decodes data from Base64 notation, automatically
 detecting gzip-compressed data and decompressing it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the string to decode
<DT><B>Returns:</B><DD>the decoded data<DT><B>Since:</B></DT>
  <DD>1.4</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decode(java.lang.String, int)"><!-- --></A><H3>
decode</H3>
<PRE>
public static byte[] <B>decode</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;s,
                            int&nbsp;options)</PRE>
<DL>
<DD>Decodes data from Base64 notation, automatically
 detecting gzip-compressed data and decompressing it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the string to decode<DD><CODE>options</CODE> - encode options such as URL_SAFE
<DT><B>Returns:</B><DD>the decoded data<DT><B>Since:</B></DT>
  <DD>1.4</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decodeToObject(java.lang.String)"><!-- --></A><H3>
decodeToObject</H3>
<PRE>
public static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A> <B>decodeToObject</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;encodedObject)</PRE>
<DL>
<DD>Attempts to decode Base64 data and deserialize a Java
 Object within. Returns <tt>null</tt> if there was an error.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>encodedObject</CODE> - The Base64 data to decode
<DT><B>Returns:</B><DD>The decoded and deserialized object<DT><B>Since:</B></DT>
  <DD>1.5</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="encodeToFile(byte[], java.lang.String)"><!-- --></A><H3>
encodeToFile</H3>
<PRE>
public static boolean <B>encodeToFile</B>(byte[]&nbsp;dataToEncode,
                                   <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;filename)</PRE>
<DL>
<DD>Convenience method for encoding data to a file.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataToEncode</CODE> - byte array of data to encode in base64 form<DD><CODE>filename</CODE> - Filename for saving encoded data
<DT><B>Returns:</B><DD><tt>true</tt> if successful, <tt>false</tt> otherwise<DT><B>Since:</B></DT>
  <DD>2.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decodeToFile(java.lang.String, java.lang.String)"><!-- --></A><H3>
decodeToFile</H3>
<PRE>
public static boolean <B>decodeToFile</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;dataToDecode,
                                   <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;filename)</PRE>
<DL>
<DD>Convenience method for decoding data to a file.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataToDecode</CODE> - Base64-encoded data as a string<DD><CODE>filename</CODE> - Filename for saving decoded data
<DT><B>Returns:</B><DD><tt>true</tt> if successful, <tt>false</tt> otherwise<DT><B>Since:</B></DT>
  <DD>2.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decodeFromFile(java.lang.String)"><!-- --></A><H3>
decodeFromFile</H3>
<PRE>
public static byte[] <B>decodeFromFile</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;filename)</PRE>
<DL>
<DD>Convenience method for reading a base64-encoded
 file and decoding it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filename</CODE> - Filename for reading encoded data
<DT><B>Returns:</B><DD>decoded byte array or null if unsuccessful<DT><B>Since:</B></DT>
  <DD>2.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="encodeFromFile(java.lang.String)"><!-- --></A><H3>
encodeFromFile</H3>
<PRE>
public static <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>encodeFromFile</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;filename)</PRE>
<DL>
<DD>Convenience method for reading a binary file
 and base64-encoding it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filename</CODE> - Filename for reading binary data
<DT><B>Returns:</B><DD>base64-encoded string or null if unsuccessful<DT><B>Since:</B></DT>
  <DD>2.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="encodeFileToFile(java.lang.String, java.lang.String)"><!-- --></A><H3>
encodeFileToFile</H3>
<PRE>
public static void <B>encodeFileToFile</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;infile,
                                    <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;outfile)</PRE>
<DL>
<DD>Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>infile</CODE> - Input file<DD><CODE>outfile</CODE> - Output file<DT><B>Since:</B></DT>
  <DD>2.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="decodeFileToFile(java.lang.String, java.lang.String)"><!-- --></A><H3>
decodeFileToFile</H3>
<PRE>
public static void <B>decodeFileToFile</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;infile,
                                    <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;outfile)</PRE>
<DL>
<DD>Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>infile</CODE> - Input file<DD><CODE>outfile</CODE> - Output file<DT><B>Since:</B></DT>
  <DD>2.2</DD>
</DL>
</DD>
</DL>
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