streams.html

java 的上传功能很强大的实施上述事实上说是

<a name="82" href="#82">82</a>  <em class="jxr_javadoccomment">     * @return Number of bytes, which have been copied.</em>
<a name="83" href="#83">83</a>  <em class="jxr_javadoccomment">     * @throws IOException An I/O error occurred.</em>
<a name="84" href="#84">84</a>  <em class="jxr_javadoccomment">     */</em>
<a name="85" href="#85">85</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">long</strong> copy(InputStream pIn,
<a name="86" href="#86">86</a>              OutputStream pOut, <strong class="jxr_keyword">boolean</strong> pClose,
<a name="87" href="#87">87</a>              byte[] pBuffer)
<a name="88" href="#88">88</a>      <strong class="jxr_keyword">throws</strong> IOException {
<a name="89" href="#89">89</a>          OutputStream out = pOut;
<a name="90" href="#90">90</a>          InputStream in = pIn;
<a name="91" href="#91">91</a>          <strong class="jxr_keyword">try</strong> {
<a name="92" href="#92">92</a>              <strong class="jxr_keyword">long</strong> total = 0;
<a name="93" href="#93">93</a>              <strong class="jxr_keyword">for</strong> (;;) {
<a name="94" href="#94">94</a>                  <strong class="jxr_keyword">int</strong> res = in.read(pBuffer);
<a name="95" href="#95">95</a>                  <strong class="jxr_keyword">if</strong> (res == -1) {
<a name="96" href="#96">96</a>                      <strong class="jxr_keyword">break</strong>;
<a name="97" href="#97">97</a>                  }
<a name="98" href="#98">98</a>                  <strong class="jxr_keyword">if</strong> (res &gt; 0) {
<a name="99" href="#99">99</a>                      total += res;
<a name="100" href="#100">100</a>                     <strong class="jxr_keyword">if</strong> (out != <strong class="jxr_keyword">null</strong>) {
<a name="101" href="#101">101</a>                         out.write(pBuffer, 0, res);
<a name="102" href="#102">102</a>                     }
<a name="103" href="#103">103</a>                 }
<a name="104" href="#104">104</a>             }
<a name="105" href="#105">105</a>             <strong class="jxr_keyword">if</strong> (out != <strong class="jxr_keyword">null</strong>) {
<a name="106" href="#106">106</a>                 <strong class="jxr_keyword">if</strong> (pClose) {
<a name="107" href="#107">107</a>                     out.close();
<a name="108" href="#108">108</a>                 } <strong class="jxr_keyword">else</strong> {
<a name="109" href="#109">109</a>                     out.flush();
<a name="110" href="#110">110</a>                 }
<a name="111" href="#111">111</a>                 out = <strong class="jxr_keyword">null</strong>;
<a name="112" href="#112">112</a>             }
<a name="113" href="#113">113</a>             in.close();
<a name="114" href="#114">114</a>             in = <strong class="jxr_keyword">null</strong>;
<a name="115" href="#115">115</a>             <strong class="jxr_keyword">return</strong> total;
<a name="116" href="#116">116</a>         } <strong class="jxr_keyword">finally</strong> {
<a name="117" href="#117">117</a>             <strong class="jxr_keyword">if</strong> (in != <strong class="jxr_keyword">null</strong>) {
<a name="118" href="#118">118</a>                 <strong class="jxr_keyword">try</strong> {
<a name="119" href="#119">119</a>                     in.close();
<a name="120" href="#120">120</a>                 } <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a name="121" href="#121">121</a>                     <em class="jxr_comment">/*<em class="jxr_comment"> Ignore me */</em></em>
<a name="122" href="#122">122</a>                 }
<a name="123" href="#123">123</a>             }
<a name="124" href="#124">124</a>             <strong class="jxr_keyword">if</strong> (pClose  &amp;&amp;  out != <strong class="jxr_keyword">null</strong>) {
<a name="125" href="#125">125</a>                 <strong class="jxr_keyword">try</strong> {
<a name="126" href="#126">126</a>                     out.close();
<a name="127" href="#127">127</a>                 } <strong class="jxr_keyword">catch</strong> (Throwable t) {
<a name="128" href="#128">128</a>                     <em class="jxr_comment">/*<em class="jxr_comment"> Ignore me */</em></em>
<a name="129" href="#129">129</a>                 }
<a name="130" href="#130">130</a>             }
<a name="131" href="#131">131</a>         }
<a name="132" href="#132">132</a>     }
<a name="133" href="#133">133</a> 
<a name="134" href="#134">134</a>     <em class="jxr_javadoccomment">/**</em>
<a name="135" href="#135">135</a> <em class="jxr_javadoccomment">     * This convenience method allows to read a</em>
<a name="136" href="#136">136</a> <em class="jxr_javadoccomment">     * {@link org.apache.commons.fileupload.FileItemStream}'s</em>
<a name="137" href="#137">137</a> <em class="jxr_javadoccomment">     * content into a string. The platform's default character encoding</em>
<a name="138" href="#138">138</a> <em class="jxr_javadoccomment">     * is used for converting bytes into characters.</em>
<a name="139" href="#139">139</a> <em class="jxr_javadoccomment">     * @param pStream The input stream to read.</em>
<a name="140" href="#140">140</a> <em class="jxr_javadoccomment">     * @see #asString(InputStream, String)</em>
<a name="141" href="#141">141</a> <em class="jxr_javadoccomment">     * @return The streams contents, as a string.</em>
<a name="142" href="#142">142</a> <em class="jxr_javadoccomment">     * @throws IOException An I/O error occurred.</em>
<a name="143" href="#143">143</a> <em class="jxr_javadoccomment">     */</em>
<a name="144" href="#144">144</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String asString(InputStream pStream) <strong class="jxr_keyword">throws</strong> IOException {
<a name="145" href="#145">145</a>         ByteArrayOutputStream baos = <strong class="jxr_keyword">new</strong> ByteArrayOutputStream();
<a name="146" href="#146">146</a>         copy(pStream, baos, <strong class="jxr_keyword">true</strong>);
<a name="147" href="#147">147</a>         <strong class="jxr_keyword">return</strong> baos.toString();
<a name="148" href="#148">148</a>     }
<a name="149" href="#149">149</a> 
<a name="150" href="#150">150</a>     <em class="jxr_javadoccomment">/**</em>
<a name="151" href="#151">151</a> <em class="jxr_javadoccomment">     * This convenience method allows to read a</em>
<a name="152" href="#152">152</a> <em class="jxr_javadoccomment">     * {@link org.apache.commons.fileupload.FileItemStream}'s</em>
<a name="153" href="#153">153</a> <em class="jxr_javadoccomment">     * content into a string, using the given character encoding.</em>
<a name="154" href="#154">154</a> <em class="jxr_javadoccomment">     * @param pStream The input stream to read.</em>
<a name="155" href="#155">155</a> <em class="jxr_javadoccomment">     * @param pEncoding The character encoding, typically "UTF-8".</em>
<a name="156" href="#156">156</a> <em class="jxr_javadoccomment">     * @see #asString(InputStream)</em>
<a name="157" href="#157">157</a> <em class="jxr_javadoccomment">     * @return The streams contents, as a string.</em>
<a name="158" href="#158">158</a> <em class="jxr_javadoccomment">     * @throws IOException An I/O error occurred.</em>
<a name="159" href="#159">159</a> <em class="jxr_javadoccomment">     */</em>
<a name="160" href="#160">160</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> String asString(InputStream pStream, String pEncoding)
<a name="161" href="#161">161</a>             <strong class="jxr_keyword">throws</strong> IOException {
<a name="162" href="#162">162</a>         ByteArrayOutputStream baos = <strong class="jxr_keyword">new</strong> ByteArrayOutputStream();
<a name="163" href="#163">163</a>         copy(pStream, baos, <strong class="jxr_keyword">true</strong>);
<a name="164" href="#164">164</a>         <strong class="jxr_keyword">return</strong> baos.toString(pEncoding);
<a name="165" href="#165">165</a>     }
<a name="166" href="#166">166</a> }
</pre>
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