replayinputstream.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="114" href="#114">114</a>     }
<a name="115" href="#115">115</a> 
<a name="116" href="#116">116</a>     <strong>public</strong> <strong>long</strong> setToResponseBodyStart() {
<a name="117" href="#117">117</a>         <strong>this</strong>.position = responseBodyStart;
<a name="118" href="#118">118</a>         <strong>return</strong> <strong>this</strong>.position;
<a name="119" href="#119">119</a>     }
<a name="120" href="#120">120</a> 
<a name="121" href="#121">121</a>     <em class="comment">/*<em class="comment"> (non-Javadoc)</em></em>
<a name="122" href="#122">122</a> <em class="comment">     * @see java.io.InputStream#read()</em>
<a name="123" href="#123">123</a> <em class="comment">     */</em>
<a name="124" href="#124">124</a>     <strong>public</strong> <strong>int</strong> read() throws IOException {
<a name="125" href="#125">125</a>         <strong>if</strong> (position == size) {
<a name="126" href="#126">126</a>             <strong>return</strong> -1; <em class="comment">// EOF</em>
<a name="127" href="#127">127</a>         }
<a name="128" href="#128">128</a>         <strong>if</strong> (position &lt; buffer.length) {
<a name="129" href="#129">129</a>             <em class="comment">// Convert to unsigned int.</em>
<a name="130" href="#130">130</a>             <strong>int</strong> c = buffer[(<strong>int</strong>) position] &amp; 0xFF;
<a name="131" href="#131">131</a>             position++;
<a name="132" href="#132">132</a>             <strong>return</strong> c;
<a name="133" href="#133">133</a>         }
<a name="134" href="#134">134</a>         <strong>int</strong> c = diskStream.read();
<a name="135" href="#135">135</a>         <strong>if</strong> (c >= 0) {
<a name="136" href="#136">136</a>             position++;
<a name="137" href="#137">137</a>         }
<a name="138" href="#138">138</a>         <strong>return</strong> c;
<a name="139" href="#139">139</a>     }
<a name="140" href="#140">140</a> 
<a name="141" href="#141">141</a>     <em class="comment">/*</em>
<a name="142" href="#142">142</a> <em class="comment">     * (non-Javadoc)</em>
<a name="143" href="#143">143</a> <em class="comment">     * </em>
<a name="144" href="#144">144</a> <em class="comment">     * @see java.io.InputStream#read(byte[], int, int)</em>
<a name="145" href="#145">145</a> <em class="comment">     */</em>
<a name="146" href="#146">146</a>     <strong>public</strong> <strong>int</strong> read(byte[] b, <strong>int</strong> off, <strong>int</strong> len) throws IOException {
<a name="147" href="#147">147</a>         <strong>if</strong> (position == size) {
<a name="148" href="#148">148</a>             <strong>return</strong> -1; <em class="comment">// EOF</em>
<a name="149" href="#149">149</a>         }
<a name="150" href="#150">150</a>         <strong>if</strong> (position &lt; buffer.length) {
<a name="151" href="#151">151</a>             <strong>int</strong> toCopy = (<strong>int</strong>)Math.min(size - position,
<a name="152" href="#152">152</a>                 Math.min(len, buffer.length - position));
<a name="153" href="#153">153</a>             System.arraycopy(buffer, (<strong>int</strong>)position, b, off, toCopy);
<a name="154" href="#154">154</a>             <strong>if</strong> (toCopy > 0) {
<a name="155" href="#155">155</a>                 position += toCopy;
<a name="156" href="#156">156</a>             }
<a name="157" href="#157">157</a>             <strong>return</strong> toCopy;
<a name="158" href="#158">158</a>         }
<a name="159" href="#159">159</a>         <em class="comment">// into disk zone</em>
<a name="160" href="#160">160</a>         <strong>int</strong> read = diskStream.read(b,off,len);
<a name="161" href="#161">161</a>         <strong>if</strong>(read>0) {
<a name="162" href="#162">162</a>             position += read;
<a name="163" href="#163">163</a>         }
<a name="164" href="#164">164</a>         <strong>return</strong> read;
<a name="165" href="#165">165</a>     }
<a name="166" href="#166">166</a> 
<a name="167" href="#167">167</a>     <strong>public</strong> <strong>void</strong> readFullyTo(OutputStream os) throws IOException {
<a name="168" href="#168">168</a>         byte[] buf = <strong>new</strong> byte[4096];
<a name="169" href="#169">169</a>         <strong>int</strong> c = read(buf);
<a name="170" href="#170">170</a>         <strong>while</strong> (c != -1) {
<a name="171" href="#171">171</a>             os.write(buf,0,c);
<a name="172" href="#172">172</a>             c = read(buf);
<a name="173" href="#173">173</a>         }
<a name="174" href="#174">174</a>     }
<a name="175" href="#175">175</a> 
<a name="176" href="#176">176</a>     <em class="comment">/*<em class="comment"> (non-Javadoc)</em></em>
<a name="177" href="#177">177</a> <em class="comment">     * @see java.io.InputStream#close()</em>
<a name="178" href="#178">178</a> <em class="comment">     */</em>
<a name="179" href="#179">179</a>     <strong>public</strong> <strong>void</strong> close() throws IOException {
<a name="180" href="#180">180</a>         <strong>super</strong>.close();
<a name="181" href="#181">181</a>         <strong>if</strong>(diskStream != <strong>null</strong>) {
<a name="182" href="#182">182</a>             diskStream.close();
<a name="183" href="#183">183</a>         }
<a name="184" href="#184">184</a>     }
<a name="185" href="#185">185</a> 
<a name="186" href="#186">186</a>     <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> mark(<strong>int</strong> limit) {
<a name="187" href="#187">187</a>         <strong>this</strong>.readlimit = limit;
<a name="188" href="#188">188</a>         <strong>this</strong>.markpos = <strong>this</strong>.position;
<a name="189" href="#189">189</a>     }
<a name="190" href="#190">190</a> 
<a name="191" href="#191">191</a>     <strong>public</strong> <strong>boolean</strong> markSupported() {
<a name="192" href="#192">192</a>         <strong>return</strong> <strong>true</strong>;
<a name="193" href="#193">193</a>     }
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>     <em class="comment">/*<em class="comment"> (non-Javadoc)</em></em>
<a name="196" href="#196">196</a> <em class="comment">     * @see java.io.InputStream#reset()</em>
<a name="197" href="#197">197</a> <em class="comment">     */</em>
<a name="198" href="#198">198</a>     <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> reset()
<a name="199" href="#199">199</a>         throws IOException
<a name="200" href="#200">200</a>     {
<a name="201" href="#201">201</a>         <strong>if</strong> (<strong>this</strong>.markpos == -1)
<a name="202" href="#202">202</a>         {
<a name="203" href="#203">203</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Mark has not been called (markpos == -1)."</span>);
<a name="204" href="#204">204</a>         }
<a name="205" href="#205">205</a> 
<a name="206" href="#206">206</a>         <em class="comment">// Adhere to the InputStream.reset contract -- only reset if we're</em>
<a name="207" href="#207">207</a>         <em class="comment">// w/i readlimit.</em>
<a name="208" href="#208">208</a>         <strong>if</strong> ((<strong>this</strong>.markpos - <strong>this</strong>.position) &lt; <strong>this</strong>.readlimit)
<a name="209" href="#209">209</a>         {
<a name="210" href="#210">210</a>             <strong>this</strong>.position = markpos;
<a name="211" href="#211">211</a>         }
<a name="212" href="#212">212</a>     }
<a name="213" href="#213">213</a> 
<a name="214" href="#214">214</a>     <em>/**<em>*</em></em>
<a name="215" href="#215">215</a> <em>     * Total size of stream content.</em>
<a name="216" href="#216">216</a> <em>     * @return Returns the size.</em>
<a name="217" href="#217">217</a> <em>     */</em>
<a name="218" href="#218">218</a>     <strong>public</strong> <strong>long</strong> getSize()
<a name="219" href="#219">219</a>     {
<a name="220" href="#220">220</a>         <strong>return</strong> size;
<a name="221" href="#221">221</a>     }
<a name="222" href="#222">222</a> 
<a name="223" href="#223">223</a>     <em>/**<em>*</em></em>
<a name="224" href="#224">224</a> <em>     * @return Amount THEORETICALLY remaining (TODO: Its not theoretical</em>
<a name="225" href="#225">225</a> <em>     * seemingly.  The class implemetentation depends on it being exact).</em>
<a name="226" href="#226">226</a> <em>     */</em>
<a name="227" href="#227">227</a>     <strong>public</strong> <strong>long</strong> remaining() {
<a name="228" href="#228">228</a>         <strong>return</strong> size - position;
<a name="229" href="#229">229</a>     }
<a name="230" href="#230">230</a> }
</pre>
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