fileitem.html

java 的上传功能很强大的实施上述事实上说是

<a name="110" href="#110">110</a>     <strong class="jxr_keyword">long</strong> getSize();
<a name="111" href="#111">111</a> 
<a name="112" href="#112">112</a> 
<a name="113" href="#113">113</a>     <em class="jxr_javadoccomment">/**</em>
<a name="114" href="#114">114</a> <em class="jxr_javadoccomment">     * Returns the contents of the file item as an array of bytes.</em>
<a name="115" href="#115">115</a> <em class="jxr_javadoccomment">     *</em>
<a name="116" href="#116">116</a> <em class="jxr_javadoccomment">     * @return The contents of the file item as an array of bytes.</em>
<a name="117" href="#117">117</a> <em class="jxr_javadoccomment">     */</em>
<a name="118" href="#118">118</a>     byte[] get();
<a name="119" href="#119">119</a> 
<a name="120" href="#120">120</a> 
<a name="121" href="#121">121</a>     <em class="jxr_javadoccomment">/**</em>
<a name="122" href="#122">122</a> <em class="jxr_javadoccomment">     * Returns the contents of the file item as a String, using the specified</em>
<a name="123" href="#123">123</a> <em class="jxr_javadoccomment">     * encoding.  This method uses {@link #get()} to retrieve the</em>
<a name="124" href="#124">124</a> <em class="jxr_javadoccomment">     * contents of the item.</em>
<a name="125" href="#125">125</a> <em class="jxr_javadoccomment">     *</em>
<a name="126" href="#126">126</a> <em class="jxr_javadoccomment">     * @param encoding The character encoding to use.</em>
<a name="127" href="#127">127</a> <em class="jxr_javadoccomment">     *</em>
<a name="128" href="#128">128</a> <em class="jxr_javadoccomment">     * @return The contents of the item, as a string.</em>
<a name="129" href="#129">129</a> <em class="jxr_javadoccomment">     *</em>
<a name="130" href="#130">130</a> <em class="jxr_javadoccomment">     * @throws UnsupportedEncodingException if the requested character</em>
<a name="131" href="#131">131</a> <em class="jxr_javadoccomment">     *                                      encoding is not available.</em>
<a name="132" href="#132">132</a> <em class="jxr_javadoccomment">     */</em>
<a name="133" href="#133">133</a>     String getString(String encoding) <strong class="jxr_keyword">throws</strong> UnsupportedEncodingException;
<a name="134" href="#134">134</a> 
<a name="135" href="#135">135</a> 
<a name="136" href="#136">136</a>     <em class="jxr_javadoccomment">/**</em>
<a name="137" href="#137">137</a> <em class="jxr_javadoccomment">     * Returns the contents of the file item as a String, using the default</em>
<a name="138" href="#138">138</a> <em class="jxr_javadoccomment">     * character encoding.  This method uses {@link #get()} to retrieve the</em>
<a name="139" href="#139">139</a> <em class="jxr_javadoccomment">     * contents of the item.</em>
<a name="140" href="#140">140</a> <em class="jxr_javadoccomment">     *</em>
<a name="141" href="#141">141</a> <em class="jxr_javadoccomment">     * @return The contents of the item, as a string.</em>
<a name="142" href="#142">142</a> <em class="jxr_javadoccomment">     */</em>
<a name="143" href="#143">143</a>     String getString();
<a name="144" href="#144">144</a> 
<a name="145" href="#145">145</a> 
<a name="146" href="#146">146</a>     <em class="jxr_javadoccomment">/**</em>
<a name="147" href="#147">147</a> <em class="jxr_javadoccomment">     * A convenience method to write an uploaded item to disk. The client code</em>
<a name="148" href="#148">148</a> <em class="jxr_javadoccomment">     * is not concerned with whether or not the item is stored in memory, or on</em>
<a name="149" href="#149">149</a> <em class="jxr_javadoccomment">     * disk in a temporary location. They just want to write the uploaded item</em>
<a name="150" href="#150">150</a> <em class="jxr_javadoccomment">     * to a file.</em>
<a name="151" href="#151">151</a> <em class="jxr_javadoccomment">     * &lt;p&gt;</em>
<a name="152" href="#152">152</a> <em class="jxr_javadoccomment">     * This method is not guaranteed to succeed if called more than once for</em>
<a name="153" href="#153">153</a> <em class="jxr_javadoccomment">     * the same item. This allows a particular implementation to use, for</em>
<a name="154" href="#154">154</a> <em class="jxr_javadoccomment">     * example, file renaming, where possible, rather than copying all of the</em>
<a name="155" href="#155">155</a> <em class="jxr_javadoccomment">     * underlying data, thus gaining a significant performance benefit.</em>
<a name="156" href="#156">156</a> <em class="jxr_javadoccomment">     *</em>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * @param file The &lt;code&gt;File&lt;/code&gt; into which the uploaded item should</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment">     *             be stored.</em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment">     *</em>
<a name="160" href="#160">160</a> <em class="jxr_javadoccomment">     * @throws Exception if an error occurs.</em>
<a name="161" href="#161">161</a> <em class="jxr_javadoccomment">     */</em>
<a name="162" href="#162">162</a>     <strong class="jxr_keyword">void</strong> write(File file) <strong class="jxr_keyword">throws</strong> Exception;
<a name="163" href="#163">163</a> 
<a name="164" href="#164">164</a> 
<a name="165" href="#165">165</a>     <em class="jxr_javadoccomment">/**</em>
<a name="166" href="#166">166</a> <em class="jxr_javadoccomment">     * Deletes the underlying storage for a file item, including deleting any</em>
<a name="167" href="#167">167</a> <em class="jxr_javadoccomment">     * associated temporary disk file. Although this storage will be deleted</em>
<a name="168" href="#168">168</a> <em class="jxr_javadoccomment">     * automatically when the &lt;code&gt;FileItem&lt;/code&gt; instance is garbage</em>
<a name="169" href="#169">169</a> <em class="jxr_javadoccomment">     * collected, this method can be used to ensure that this is done at an</em>
<a name="170" href="#170">170</a> <em class="jxr_javadoccomment">     * earlier time, thus preserving system resources.</em>
<a name="171" href="#171">171</a> <em class="jxr_javadoccomment">     */</em>
<a name="172" href="#172">172</a>     <strong class="jxr_keyword">void</strong> delete();
<a name="173" href="#173">173</a> 
<a name="174" href="#174">174</a> 
<a name="175" href="#175">175</a>     <em class="jxr_javadoccomment">/**</em>
<a name="176" href="#176">176</a> <em class="jxr_javadoccomment">     * Returns the name of the field in the multipart form corresponding to</em>
<a name="177" href="#177">177</a> <em class="jxr_javadoccomment">     * this file item.</em>
<a name="178" href="#178">178</a> <em class="jxr_javadoccomment">     *</em>
<a name="179" href="#179">179</a> <em class="jxr_javadoccomment">     * @return The name of the form field.</em>
<a name="180" href="#180">180</a> <em class="jxr_javadoccomment">     */</em>
<a name="181" href="#181">181</a>     String getFieldName();
<a name="182" href="#182">182</a> 
<a name="183" href="#183">183</a> 
<a name="184" href="#184">184</a>     <em class="jxr_javadoccomment">/**</em>
<a name="185" href="#185">185</a> <em class="jxr_javadoccomment">     * Sets the field name used to reference this file item.</em>
<a name="186" href="#186">186</a> <em class="jxr_javadoccomment">     *</em>
<a name="187" href="#187">187</a> <em class="jxr_javadoccomment">     * @param name The name of the form field.</em>
<a name="188" href="#188">188</a> <em class="jxr_javadoccomment">     */</em>
<a name="189" href="#189">189</a>     <strong class="jxr_keyword">void</strong> setFieldName(String name);
<a name="190" href="#190">190</a> 
<a name="191" href="#191">191</a> 
<a name="192" href="#192">192</a>     <em class="jxr_javadoccomment">/**</em>
<a name="193" href="#193">193</a> <em class="jxr_javadoccomment">     * Determines whether or not a &lt;code&gt;FileItem&lt;/code&gt; instance represents</em>
<a name="194" href="#194">194</a> <em class="jxr_javadoccomment">     * a simple form field.</em>
<a name="195" href="#195">195</a> <em class="jxr_javadoccomment">     *</em>
<a name="196" href="#196">196</a> <em class="jxr_javadoccomment">     * @return &lt;code&gt;true&lt;/code&gt; if the instance represents a simple form</em>
<a name="197" href="#197">197</a> <em class="jxr_javadoccomment">     *         field; &lt;code&gt;false&lt;/code&gt; if it represents an uploaded file.</em>
<a name="198" href="#198">198</a> <em class="jxr_javadoccomment">     */</em>
<a name="199" href="#199">199</a>     <strong class="jxr_keyword">boolean</strong> isFormField();
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a> 
<a name="202" href="#202">202</a>     <em class="jxr_javadoccomment">/**</em>
<a name="203" href="#203">203</a> <em class="jxr_javadoccomment">     * Specifies whether or not a &lt;code&gt;FileItem&lt;/code&gt; instance represents</em>
<a name="204" href="#204">204</a> <em class="jxr_javadoccomment">     * a simple form field.</em>
<a name="205" href="#205">205</a> <em class="jxr_javadoccomment">     *</em>
<a name="206" href="#206">206</a> <em class="jxr_javadoccomment">     * @param state &lt;code&gt;true&lt;/code&gt; if the instance represents a simple form</em>
<a name="207" href="#207">207</a> <em class="jxr_javadoccomment">     *              field; &lt;code&gt;false&lt;/code&gt; if it represents an uploaded file.</em>
<a name="208" href="#208">208</a> <em class="jxr_javadoccomment">     */</em>
<a name="209" href="#209">209</a>     <strong class="jxr_keyword">void</strong> setFormField(<strong class="jxr_keyword">boolean</strong> state);
<a name="210" href="#210">210</a> 
<a name="211" href="#211">211</a> 
<a name="212" href="#212">212</a>     <em class="jxr_javadoccomment">/**</em>
<a name="213" href="#213">213</a> <em class="jxr_javadoccomment">     * Returns an {@link java.io.OutputStream OutputStream} that can</em>
<a name="214" href="#214">214</a> <em class="jxr_javadoccomment">     * be used for storing the contents of the file.</em>
<a name="215" href="#215">215</a> <em class="jxr_javadoccomment">     *</em>
<a name="216" href="#216">216</a> <em class="jxr_javadoccomment">     * @return An {@link java.io.OutputStream OutputStream} that can be used</em>
<a name="217" href="#217">217</a> <em class="jxr_javadoccomment">     *         for storing the contensts of the file.</em>
<a name="218" href="#218">218</a> <em class="jxr_javadoccomment">     *</em>
<a name="219" href="#219">219</a> <em class="jxr_javadoccomment">     * @throws IOException if an error occurs.</em>
<a name="220" href="#220">220</a> <em class="jxr_javadoccomment">     */</em>
<a name="221" href="#221">221</a>     OutputStream getOutputStream() <strong class="jxr_keyword">throws</strong> IOException;
<a name="222" href="#222">222</a> 
<a name="223" href="#223">223</a> }
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