multipartstream.html

java 的上传功能很强大的实施上述事实上说是

<a name="375" href="#375">375</a> <em class="jxr_javadoccomment">     * @deprecated Use {@link #MultipartStream(InputStream, byte[],</em>
<a name="376" href="#376">376</a> <em class="jxr_javadoccomment">     *  MultipartStream.ProgressNotifier)}.</em>
<a name="377" href="#377">377</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[], int,</em>
<a name="378" href="#378">378</a> <em class="jxr_javadoccomment">     *  MultipartStream.ProgressNotifier)</em>
<a name="379" href="#379">379</a> <em class="jxr_javadoccomment">     */</em>
<a name="380" href="#380">380</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input,
<a name="381" href="#381">381</a>             byte[] boundary) {
<a name="382" href="#382">382</a>         <strong class="jxr_keyword">this</strong>(input, boundary, DEFAULT_BUFSIZE, <strong class="jxr_keyword">null</strong>);
<a name="383" href="#383">383</a>     }
<a name="384" href="#384">384</a> 
<a name="385" href="#385">385</a>     <em class="jxr_comment">// --------------------------------------------------------- Public methods</em>
<a name="386" href="#386">386</a> 
<a name="387" href="#387">387</a> 
<a name="388" href="#388">388</a>     <em class="jxr_javadoccomment">/**</em>
<a name="389" href="#389">389</a> <em class="jxr_javadoccomment">     * Retrieves the character encoding used when reading the headers of an</em>
<a name="390" href="#390">390</a> <em class="jxr_javadoccomment">     * individual part. When not specified, or &lt;code&gt;null&lt;/code&gt;, the platform</em>
<a name="391" href="#391">391</a> <em class="jxr_javadoccomment">     * default encoding is used.</em>
<a name="392" href="#392">392</a> 
<a name="393" href="#393">393</a> <em class="jxr_javadoccomment">     *</em>
<a name="394" href="#394">394</a> <em class="jxr_javadoccomment">     * @return The encoding used to read part headers.</em>
<a name="395" href="#395">395</a> <em class="jxr_javadoccomment">     */</em>
<a name="396" href="#396">396</a>     <strong class="jxr_keyword">public</strong> String getHeaderEncoding() {
<a name="397" href="#397">397</a>         <strong class="jxr_keyword">return</strong> headerEncoding;
<a name="398" href="#398">398</a>     }
<a name="399" href="#399">399</a> 
<a name="400" href="#400">400</a> 
<a name="401" href="#401">401</a>     <em class="jxr_javadoccomment">/**</em>
<a name="402" href="#402">402</a> <em class="jxr_javadoccomment">     * Specifies the character encoding to be used when reading the headers of</em>
<a name="403" href="#403">403</a> <em class="jxr_javadoccomment">     * individual parts. When not specified, or &lt;code&gt;null&lt;/code&gt;, the platform</em>
<a name="404" href="#404">404</a> <em class="jxr_javadoccomment">     * default encoding is used.</em>
<a name="405" href="#405">405</a> <em class="jxr_javadoccomment">     *</em>
<a name="406" href="#406">406</a> <em class="jxr_javadoccomment">     * @param encoding The encoding used to read part headers.</em>
<a name="407" href="#407">407</a> <em class="jxr_javadoccomment">     */</em>
<a name="408" href="#408">408</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setHeaderEncoding(String encoding) {
<a name="409" href="#409">409</a>         headerEncoding = encoding;
<a name="410" href="#410">410</a>     }
<a name="411" href="#411">411</a> 
<a name="412" href="#412">412</a> 
<a name="413" href="#413">413</a>     <em class="jxr_javadoccomment">/**</em>
<a name="414" href="#414">414</a> <em class="jxr_javadoccomment">     * Reads a byte from the &lt;code&gt;buffer&lt;/code&gt;, and refills it as</em>
<a name="415" href="#415">415</a> <em class="jxr_javadoccomment">     * necessary.</em>
<a name="416" href="#416">416</a> <em class="jxr_javadoccomment">     *</em>
<a name="417" href="#417">417</a> <em class="jxr_javadoccomment">     * @return The next byte from the input stream.</em>
<a name="418" href="#418">418</a> <em class="jxr_javadoccomment">     *</em>
<a name="419" href="#419">419</a> <em class="jxr_javadoccomment">     * @throws IOException if there is no more data available.</em>
<a name="420" href="#420">420</a> <em class="jxr_javadoccomment">     */</em>
<a name="421" href="#421">421</a>     <strong class="jxr_keyword">public</strong> byte readByte() <strong class="jxr_keyword">throws</strong> IOException {
<a name="422" href="#422">422</a>         <em class="jxr_comment">// Buffer depleted ?</em>
<a name="423" href="#423">423</a>         <strong class="jxr_keyword">if</strong> (head == tail) {
<a name="424" href="#424">424</a>             head = 0;
<a name="425" href="#425">425</a>             <em class="jxr_comment">// Refill.</em>
<a name="426" href="#426">426</a>             tail = input.read(buffer, head, bufSize);
<a name="427" href="#427">427</a>             <strong class="jxr_keyword">if</strong> (tail == -1) {
<a name="428" href="#428">428</a>                 <em class="jxr_comment">// No more data available.</em>
<a name="429" href="#429">429</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IOException(<span class="jxr_string">"No more data is available"</span>);
<a name="430" href="#430">430</a>             }
<a name="431" href="#431">431</a>             <strong class="jxr_keyword">if</strong> (notifier != <strong class="jxr_keyword">null</strong>) {
<a name="432" href="#432">432</a>                 notifier.noteBytesRead(tail);
<a name="433" href="#433">433</a>             }
<a name="434" href="#434">434</a>         }
<a name="435" href="#435">435</a>         <strong class="jxr_keyword">return</strong> buffer[head++];
<a name="436" href="#436">436</a>     }
<a name="437" href="#437">437</a> 
<a name="438" href="#438">438</a> 
<a name="439" href="#439">439</a>     <em class="jxr_javadoccomment">/**</em>
<a name="440" href="#440">440</a> <em class="jxr_javadoccomment">     * Skips a &lt;code&gt;boundary&lt;/code&gt; token, and checks whether more</em>
<a name="441" href="#441">441</a> <em class="jxr_javadoccomment">     * &lt;code&gt;encapsulations&lt;/code&gt; are contained in the stream.</em>
<a name="442" href="#442">442</a> <em class="jxr_javadoccomment">     *</em>
<a name="443" href="#443">443</a> <em class="jxr_javadoccomment">     * @return &lt;code&gt;true&lt;/code&gt; if there are more encapsulations in</em>
<a name="444" href="#444">444</a> <em class="jxr_javadoccomment">     *         this stream; &lt;code&gt;false&lt;/code&gt; otherwise.</em>
<a name="445" href="#445">445</a> <em class="jxr_javadoccomment">     *</em>
<a name="446" href="#446">446</a> <em class="jxr_javadoccomment">     * @throws MalformedStreamException if the stream ends unexpecetedly or</em>
<a name="447" href="#447">447</a> <em class="jxr_javadoccomment">     *                                  fails to follow required syntax.</em>
<a name="448" href="#448">448</a> <em class="jxr_javadoccomment">     */</em>
<a name="449" href="#449">449</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">boolean</strong> readBoundary()
<a name="450" href="#450">450</a>             <strong class="jxr_keyword">throws</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a> {
<a name="451" href="#451">451</a>         byte[] marker = <strong class="jxr_keyword">new</strong> byte[2];
<a name="452" href="#452">452</a>         <strong class="jxr_keyword">boolean</strong> nextChunk = false;
<a name="453" href="#453">453</a> 
<a name="454" href="#454">454</a>         head += boundaryLength;
<a name="455" href="#455">455</a>         <strong class="jxr_keyword">try</strong> {
<a name="456" href="#456">456</a>             marker[0] = readByte();
<a name="457" href="#457">457</a>             <strong class="jxr_keyword">if</strong> (marker[0] == LF) {
<a name="458" href="#458">458</a>                 <em class="jxr_comment">// Work around IE5 Mac bug with input type=image.</em>
<a name="459" href="#459">459</a>                 <em class="jxr_comment">// Because the boundary delimiter, not including the trailing</em>
<a name="460" href="#460">460</a>                 <em class="jxr_comment">// CRLF, must not appear within any file (RFC 2046, section</em>
<a name="461" href="#461">461</a>                 <em class="jxr_comment">// 5.1.1), we know the missing CR is due to a buggy browser</em>
<a name="462" href="#462">462</a>                 <em class="jxr_comment">// rather than a file containing something similar to a</em>
<a name="463" href="#463">463</a>                 <em class="jxr_comment">// boundary.</em>
<a name="464" href="#464">464</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">true</strong>;
<a name="465" href="#465">465</a>             }
<a name="466" href="#466">466</a> 
<a name="467" href="#467">467</a>             marker[1] = readByte();
<a name="468" href="#468">468</a>             <strong class="jxr_keyword">if</strong> (arrayequals(marker, STREAM_TERMINATOR, 2)) {
<a name="469" href="#469">469</a>                 nextChunk = false;
<a name="470" href="#470">470</a>             } <strong class="jxr_keyword">else</strong> <strong class="jxr_keyword">if</strong> (arrayequals(marker, FIELD_SEPARATOR, 2)) {
<a name="471" href="#471">471</a>                 nextChunk = <strong class="jxr_keyword">true</strong>;
<a name="472" href="#472">472</a>             } <strong class="jxr_keyword">else</strong> {
<a name="473" href="#473">473</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(
<a name="474" href="#474">474</a>                 <span class="jxr_string">"Unexpected characters follow a boundary"</span>);
<a name="475" href="#475">475</a>             }
<a name="476" href="#476">476</a>         } <strong class="jxr_keyword">catch</strong> (IOException e) {
<a name="477" href="#477">477</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MalformedStreamException</a>(<span class="jxr_string">"Stream ended unexpectedly"</span>);
<a name="478" href="#478">478</a>         }
<a name="479" href="#479">479</a>         <strong class="jxr_keyword">return</strong> nextChunk;
<a name="480" href="#480">480</a>     }
<a name="481" href="#481">481</a> 
<a name="482" href="#482">482</a> 
<a name="483" href="#483">483</a>     <em class="jxr_javadoccomment">/**</em>
<a name="484" href="#484">484</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Changes the boundary token used for partitioning the stream.</em>
<a name="485" href="#485">485</a> <em class="jxr_javadoccomment">     *</em>
<a name="486" href="#486">486</a> <em class="jxr_javadoccomment">     * &lt;p&gt;This method allows single pass processing of nested multipart</em>
<a name="487" href="#487">487</a> <em class="jxr_javadoccomment">     * streams.</em>
<a name="488" href="#488">488</a> <em class="jxr_javadoccomment">     *</em>
<a name="489" href="#489">489</a> <em class="jxr_javadoccomment">     * &lt;p&gt;The boundary token of the nested stream is &lt;code&gt;required&lt;/code&gt;</em>
<a name="490" href="#490">490</a> <em class="jxr_javadoccomment">     * to be of the same length as the boundary token in parent stream.</em>
<a name="491" href="#491">491</a> <em class="jxr_javadoccomment">     *</em>
<a name="492" href="#492">492</a> <em class="jxr_javadoccomment">     * &lt;p&gt;Restoring the parent stream boundary token after processing of a</em>
<a name="493" href="#493">493</a> <em class="jxr_javadoccomment">     * nested stream is left to the application.</em>
<a name="494" href="#494">494</a> <em class="jxr_javadoccomment">     *</em>
<a name="495" href="#495">495</a> <em class="jxr_javadoccomment">     * @param boundary The boundary to be used for parsing of the nested</em>
<a name="496" href="#496">496</a> <em class="jxr_javadoccomment">     *                 stream.</em>
<a name="497" href="#497">497</a> <em class="jxr_javadoccomment">     *</em>
<a name="498" href="#498">498</a> <em class="jxr_javadoccomment">     * @throws IllegalBoundaryException if the &lt;code&gt;boundary&lt;/code&gt;</em>
<a name="499" href="#499">499</a> <em class="jxr_javadoccomment">     *                                  has a different length than the one</em>
<a name="500" href="#500">500</a> <em class="jxr_javadoccomment">     *                                  being currently parsed.</em>
<a name="501" href="#501">501</a> <em class="jxr_javadoccomment">     */</em>
<a name="502" href="#502">502</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> setBoundary(byte[] boundary)