multipartstream.html

java 的上传功能很强大的实施上述事实上说是

<a name="247" href="#247">247</a> <em class="jxr_javadoccomment">     * &lt;br&gt;</em>
<a name="248" href="#248">248</a> <em class="jxr_javadoccomment">     * 0 &lt;= head &lt; bufSize</em>
<a name="249" href="#249">249</a> <em class="jxr_javadoccomment">     */</em>
<a name="250" href="#250">250</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> head;
<a name="251" href="#251">251</a> 
<a name="252" href="#252">252</a> 
<a name="253" href="#253">253</a>     <em class="jxr_javadoccomment">/**</em>
<a name="254" href="#254">254</a> <em class="jxr_javadoccomment">     * The index of last valid characer in the buffer + 1.</em>
<a name="255" href="#255">255</a> <em class="jxr_javadoccomment">     * &lt;br&gt;</em>
<a name="256" href="#256">256</a> <em class="jxr_javadoccomment">     * 0 &lt;= tail &lt;= bufSize</em>
<a name="257" href="#257">257</a> <em class="jxr_javadoccomment">     */</em>
<a name="258" href="#258">258</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> tail;
<a name="259" href="#259">259</a> 
<a name="260" href="#260">260</a> 
<a name="261" href="#261">261</a>     <em class="jxr_javadoccomment">/**</em>
<a name="262" href="#262">262</a> <em class="jxr_javadoccomment">     * The content encoding to use when reading headers.</em>
<a name="263" href="#263">263</a> <em class="jxr_javadoccomment">     */</em>
<a name="264" href="#264">264</a>     <strong class="jxr_keyword">private</strong> String headerEncoding;
<a name="265" href="#265">265</a> 
<a name="266" href="#266">266</a> 
<a name="267" href="#267">267</a>     <em class="jxr_javadoccomment">/**</em>
<a name="268" href="#268">268</a> <em class="jxr_javadoccomment">     * The progress notifier, if any, or null.</em>
<a name="269" href="#269">269</a> <em class="jxr_javadoccomment">     */</em>
<a name="270" href="#270">270</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> notifier;
<a name="271" href="#271">271</a> 
<a name="272" href="#272">272</a>     <em class="jxr_comment">// ----------------------------------------------------------- Constructors</em>
<a name="273" href="#273">273</a> 
<a name="274" href="#274">274</a>     <em class="jxr_javadoccomment">/**</em>
<a name="275" href="#275">275</a> <em class="jxr_javadoccomment">     * Creates a new instance.</em>
<a name="276" href="#276">276</a> <em class="jxr_javadoccomment">     * @deprecated Use {@link #MultipartStream(InputStream, byte[],</em>
<a name="277" href="#277">277</a> <em class="jxr_javadoccomment">     * org.apache.commons.fileupload.MultipartStream.ProgressNotifier)},</em>
<a name="278" href="#278">278</a> <em class="jxr_javadoccomment">     * or {@link #MultipartStream(InputStream, byte[], int,</em>
<a name="279" href="#279">279</a> <em class="jxr_javadoccomment">     * org.apache.commons.fileupload.MultipartStream.ProgressNotifier)}</em>
<a name="280" href="#280">280</a> <em class="jxr_javadoccomment">     */</em>
<a name="281" href="#281">281</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>() {
<a name="282" href="#282">282</a>         <strong class="jxr_keyword">this</strong>(<strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>, <strong class="jxr_keyword">null</strong>);
<a name="283" href="#283">283</a>     }
<a name="284" href="#284">284</a> 
<a name="285" href="#285">285</a>     <em class="jxr_javadoccomment">/**</em>
<a name="286" href="#286">286</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a custom size buffer</em>
<a name="287" href="#287">287</a> <em class="jxr_javadoccomment">     * and no progress notifier.</em>
<a name="288" href="#288">288</a> <em class="jxr_javadoccomment">     *</em>
<a name="289" href="#289">289</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Note that the buffer must be at least big enough to contain the</em>
<a name="290" href="#290">290</a> <em class="jxr_javadoccomment">     * boundary string, plus 4 characters for CR/LF and double dash, plus at</em>
<a name="291" href="#291">291</a> <em class="jxr_javadoccomment">     * least one byte of data.  Too small a buffer size setting will degrade</em>
<a name="292" href="#292">292</a> <em class="jxr_javadoccomment">     * performance.</em>
<a name="293" href="#293">293</a> <em class="jxr_javadoccomment">     *</em>
<a name="294" href="#294">294</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="295" href="#295">295</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="296" href="#296">296</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="297" href="#297">297</a> <em class="jxr_javadoccomment">     * @param bufSize  The size of the buffer to be used, in bytes.</em>
<a name="298" href="#298">298</a> <em class="jxr_javadoccomment">     *</em>
<a name="299" href="#299">299</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[],</em>
<a name="300" href="#300">300</a> <em class="jxr_javadoccomment">     *   MultipartStream.ProgressNotifier)</em>
<a name="301" href="#301">301</a> <em class="jxr_javadoccomment">     * @deprecated Use {@link #MultipartStream(InputStream, byte[], int,</em>
<a name="302" href="#302">302</a> <em class="jxr_javadoccomment">     *  org.apache.commons.fileupload.MultipartStream.ProgressNotifier)}.</em>
<a name="303" href="#303">303</a> <em class="jxr_javadoccomment">     */</em>
<a name="304" href="#304">304</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input, byte[] boundary, <strong class="jxr_keyword">int</strong> bufSize) {
<a name="305" href="#305">305</a>         <strong class="jxr_keyword">this</strong>(input, boundary, bufSize, <strong class="jxr_keyword">null</strong>);
<a name="306" href="#306">306</a>     }
<a name="307" href="#307">307</a> 
<a name="308" href="#308">308</a>     <em class="jxr_javadoccomment">/**</em>
<a name="309" href="#309">309</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a custom size buffer.</em>
<a name="310" href="#310">310</a> <em class="jxr_javadoccomment">     *</em>
<a name="311" href="#311">311</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Note that the buffer must be at least big enough to contain the</em>
<a name="312" href="#312">312</a> <em class="jxr_javadoccomment">     * boundary string, plus 4 characters for CR/LF and double dash, plus at</em>
<a name="313" href="#313">313</a> <em class="jxr_javadoccomment">     * least one byte of data.  Too small a buffer size setting will degrade</em>
<a name="314" href="#314">314</a> <em class="jxr_javadoccomment">     * performance.</em>
<a name="315" href="#315">315</a> <em class="jxr_javadoccomment">     *</em>
<a name="316" href="#316">316</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="317" href="#317">317</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="318" href="#318">318</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="319" href="#319">319</a> <em class="jxr_javadoccomment">     * @param bufSize  The size of the buffer to be used, in bytes.</em>
<a name="320" href="#320">320</a> <em class="jxr_javadoccomment">     * @param pNotifier The notifier, which is used for calling the</em>
<a name="321" href="#321">321</a> <em class="jxr_javadoccomment">     *                  progress listener, if any.</em>
<a name="322" href="#322">322</a> <em class="jxr_javadoccomment">     *</em>
<a name="323" href="#323">323</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[],</em>
<a name="324" href="#324">324</a> <em class="jxr_javadoccomment">     *     MultipartStream.ProgressNotifier)</em>
<a name="325" href="#325">325</a> <em class="jxr_javadoccomment">     */</em>
<a name="326" href="#326">326</a>     <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input,
<a name="327" href="#327">327</a>             byte[] boundary,
<a name="328" href="#328">328</a>             <strong class="jxr_keyword">int</strong> bufSize,
<a name="329" href="#329">329</a>             <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> pNotifier) {
<a name="330" href="#330">330</a>         <strong class="jxr_keyword">this</strong>.input = input;
<a name="331" href="#331">331</a>         <strong class="jxr_keyword">this</strong>.bufSize = bufSize;
<a name="332" href="#332">332</a>         <strong class="jxr_keyword">this</strong>.buffer = <strong class="jxr_keyword">new</strong> byte[bufSize];
<a name="333" href="#333">333</a>         <strong class="jxr_keyword">this</strong>.notifier = pNotifier;
<a name="334" href="#334">334</a> 
<a name="335" href="#335">335</a>         <em class="jxr_comment">// We prepend CR/LF to the boundary to chop trailng CR/LF from</em>
<a name="336" href="#336">336</a>         <em class="jxr_comment">// body-data tokens.</em>
<a name="337" href="#337">337</a>         <strong class="jxr_keyword">this</strong>.boundary = <strong class="jxr_keyword">new</strong> byte[boundary.length + BOUNDARY_PREFIX.length];
<a name="338" href="#338">338</a>         <strong class="jxr_keyword">this</strong>.boundaryLength = boundary.length + BOUNDARY_PREFIX.length;
<a name="339" href="#339">339</a>         <strong class="jxr_keyword">this</strong>.keepRegion = <strong class="jxr_keyword">this</strong>.boundary.length;
<a name="340" href="#340">340</a>         System.arraycopy(BOUNDARY_PREFIX, 0, <strong class="jxr_keyword">this</strong>.boundary, 0,
<a name="341" href="#341">341</a>                 BOUNDARY_PREFIX.length);
<a name="342" href="#342">342</a>         System.arraycopy(boundary, 0, <strong class="jxr_keyword">this</strong>.boundary, BOUNDARY_PREFIX.length,
<a name="343" href="#343">343</a>                 boundary.length);
<a name="344" href="#344">344</a> 
<a name="345" href="#345">345</a>         head = 0;
<a name="346" href="#346">346</a>         tail = 0;
<a name="347" href="#347">347</a>     }
<a name="348" href="#348">348</a> 
<a name="349" href="#349">349</a> 
<a name="350" href="#350">350</a>     <em class="jxr_javadoccomment">/**</em>
<a name="351" href="#351">351</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a default size buffer.</em>
<a name="352" href="#352">352</a> <em class="jxr_javadoccomment">     *</em>
<a name="353" href="#353">353</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="354" href="#354">354</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="355" href="#355">355</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="356" href="#356">356</a> <em class="jxr_javadoccomment">     * @param pNotifier An object for calling the progress listener, if any.</em>
<a name="357" href="#357">357</a> <em class="jxr_javadoccomment">     *</em>
<a name="358" href="#358">358</a> <em class="jxr_javadoccomment">     *</em>
<a name="359" href="#359">359</a> <em class="jxr_javadoccomment">     * @see #MultipartStream(InputStream, byte[], int,</em>
<a name="360" href="#360">360</a> <em class="jxr_javadoccomment">     *     MultipartStream.ProgressNotifier)</em>
<a name="361" href="#361">361</a> <em class="jxr_javadoccomment">     */</em>
<a name="362" href="#362">362</a>     <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">MultipartStream</a>(InputStream input,
<a name="363" href="#363">363</a>             byte[] boundary,
<a name="364" href="#364">364</a>             <a href="../../../../org/apache/commons/fileupload/MultipartStream.html">ProgressNotifier</a> pNotifier) {
<a name="365" href="#365">365</a>         <strong class="jxr_keyword">this</strong>(input, boundary, DEFAULT_BUFSIZE, pNotifier);
<a name="366" href="#366">366</a>     }
<a name="367" href="#367">367</a> 
<a name="368" href="#368">368</a>     <em class="jxr_javadoccomment">/**</em>
<a name="369" href="#369">369</a> <em class="jxr_javadoccomment">     * &lt;p&gt; Constructs a &lt;code&gt;MultipartStream&lt;/code&gt; with a default size buffer.</em>
<a name="370" href="#370">370</a> <em class="jxr_javadoccomment">     *</em>
<a name="371" href="#371">371</a> <em class="jxr_javadoccomment">     * @param input    The &lt;code&gt;InputStream&lt;/code&gt; to serve as a data source.</em>
<a name="372" href="#372">372</a> <em class="jxr_javadoccomment">     * @param boundary The token used for dividing the stream into</em>
<a name="373" href="#373">373</a> <em class="jxr_javadoccomment">     *                 &lt;code&gt;encapsulations&lt;/code&gt;.</em>
<a name="374" href="#374">374</a> <em class="jxr_javadoccomment">     *</em>