httpparser.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="117" href="#117">117</a>                         offset++;
<a name="118" href="#118">118</a>                     }
<a name="119" href="#119">119</a>                 }
<a name="120" href="#120">120</a>             }
<a name="121" href="#121">121</a>         }
<a name="122" href="#122">122</a>         <strong>return</strong> EncodingUtil.getString(rawdata, 0, len - offset, charset);
<a name="123" href="#123">123</a>     }
<a name="124" href="#124">124</a> 
<a name="125" href="#125">125</a>     <em>/**<em>*</em></em>
<a name="126" href="#126">126</a> <em>     * Read up to &lt;tt>"\n"&lt;/tt> from an (unchunked) input stream.</em>
<a name="127" href="#127">127</a> <em>     * If the stream ends before the line terminator is found,</em>
<a name="128" href="#128">128</a> <em>     * the last part of the string will still be returned.</em>
<a name="129" href="#129">129</a> <em>     * If no input data available, &lt;code>null&lt;/code> is returned</em>
<a name="130" href="#130">130</a> <em>     *</em>
<a name="131" href="#131">131</a> <em>     * @param inputStream the stream to read from</em>
<a name="132" href="#132">132</a> <em>     *</em>
<a name="133" href="#133">133</a> <em>     * @throws IOException if an I/O problem occurs</em>
<a name="134" href="#134">134</a> <em>     * @return a line from the stream</em>
<a name="135" href="#135">135</a> <em>     * </em>
<a name="136" href="#136">136</a> <em>     * @deprecated use #readLine(InputStream, String)</em>
<a name="137" href="#137">137</a> <em>     */</em>
<a name="138" href="#138">138</a> 
<a name="139" href="#139">139</a>     <strong>public</strong> <strong>static</strong> String readLine(InputStream inputStream) throws IOException {
<a name="140" href="#140">140</a>         LOG.trace(<span class="string">"enter HttpParser.readLine(InputStream)"</span>);
<a name="141" href="#141">141</a>         <strong>return</strong> readLine(inputStream, <span class="string">"US-ASCII"</span>);
<a name="142" href="#142">142</a>     }
<a name="143" href="#143">143</a>     
<a name="144" href="#144">144</a>     <em>/**<em>*</em></em>
<a name="145" href="#145">145</a> <em>     * Parses headers from the given stream.  Headers with the same name are not</em>
<a name="146" href="#146">146</a> <em>     * combined.</em>
<a name="147" href="#147">147</a> <em>     * </em>
<a name="148" href="#148">148</a> <em>     * @param is the stream to read headers from</em>
<a name="149" href="#149">149</a> <em>     * @param charset the charset to use for reading the data</em>
<a name="150" href="#150">150</a> <em>     * </em>
<a name="151" href="#151">151</a> <em>     * @return an array of headers in the order in which they were parsed</em>
<a name="152" href="#152">152</a> <em>     * </em>
<a name="153" href="#153">153</a> <em>     * @throws IOException if an IO error occurs while reading from the stream</em>
<a name="154" href="#154">154</a> <em>     * @throws HttpException if there is an error parsing a header value</em>
<a name="155" href="#155">155</a> <em>     * </em>
<a name="156" href="#156">156</a> <em>     * @since 3.0</em>
<a name="157" href="#157">157</a> <em>     */</em>
<a name="158" href="#158">158</a>     <strong>public</strong> <strong>static</strong> Header[] parseHeaders(InputStream is, String charset) throws IOException, HttpException {
<a name="159" href="#159">159</a>         LOG.trace(<span class="string">"enter HeaderParser.parseHeaders(InputStream, String)"</span>);
<a name="160" href="#160">160</a> 
<a name="161" href="#161">161</a>         ArrayList headers = <strong>new</strong> ArrayList();
<a name="162" href="#162">162</a>         String name = <strong>null</strong>;
<a name="163" href="#163">163</a>         StringBuffer value = <strong>null</strong>;
<a name="164" href="#164">164</a>         <strong>for</strong> (; ;) {
<a name="165" href="#165">165</a>             String line = HttpParser.readLine(is, charset);
<a name="166" href="#166">166</a>             <strong>if</strong> ((line == <strong>null</strong>) || (line.trim().length() &lt; 1)) {
<a name="167" href="#167">167</a>                 <strong>break</strong>;
<a name="168" href="#168">168</a>             }
<a name="169" href="#169">169</a> 
<a name="170" href="#170">170</a>             <em class="comment">// Parse the header name and value</em>
<a name="171" href="#171">171</a>             <em class="comment">// Check for folded headers first</em>
<a name="172" href="#172">172</a>             <em class="comment">// Detect LWS-char see HTTP/1.0 or HTTP/1.1 Section 2.2</em>
<a name="173" href="#173">173</a>             <em class="comment">// discussion on folded headers</em>
<a name="174" href="#174">174</a>             <strong>if</strong> ((line.charAt(0) == ' ') || (line.charAt(0) == '\t')) {
<a name="175" href="#175">175</a>                 <em class="comment">// we have continuation folded header</em>
<a name="176" href="#176">176</a>                 <em class="comment">// so append value</em>
<a name="177" href="#177">177</a>                 <strong>if</strong> (value != <strong>null</strong>) {
<a name="178" href="#178">178</a>                     value.append(' ');
<a name="179" href="#179">179</a>                     value.append(line.trim());
<a name="180" href="#180">180</a>                 }
<a name="181" href="#181">181</a>             } <strong>else</strong> {
<a name="182" href="#182">182</a>                 <em class="comment">// make sure we save the previous name,value pair if present</em>
<a name="183" href="#183">183</a>                 <strong>if</strong> (name != <strong>null</strong>) {
<a name="184" href="#184">184</a>                     headers.add(<strong>new</strong> Header(name, value.toString()));
<a name="185" href="#185">185</a>                 }
<a name="186" href="#186">186</a> 
<a name="187" href="#187">187</a>                 <em class="comment">// Otherwise we should have normal HTTP header line</em>
<a name="188" href="#188">188</a>                 <em class="comment">// Parse the header name and value</em>
<a name="189" href="#189">189</a>                 <strong>int</strong> colon = line.indexOf(<span class="string">":"</span>);
<a name="190" href="#190">190</a>                 
<a name="191" href="#191">191</a>                 <em class="comment">// START HERITRIX Change</em>
<a name="192" href="#192">192</a>                 <em class="comment">// Don't throw an exception if can't parse.  We want to keep</em>
<a name="193" href="#193">193</a>                 <em class="comment">// going even though header is bad. Rather, create</em>
<a name="194" href="#194">194</a>                 <em class="comment">// pseudo-header.</em>
<a name="195" href="#195">195</a>                 <strong>if</strong> (colon &lt; 0) {
<a name="196" href="#196">196</a>                     <em class="comment">// throw new ProtocolException("Unable to parse header: " +</em>
<a name="197" href="#197">197</a>                     <em class="comment">//      line);</em>
<a name="198" href="#198">198</a>                     name = <span class="string">"HttpClient-Bad-Header-Line-Failed-Parse"</span>;
<a name="199" href="#199">199</a>                     value = <strong>new</strong> StringBuffer(line);
<a name="200" href="#200">200</a> 
<a name="201" href="#201">201</a>                 } <strong>else</strong> {
<a name="202" href="#202">202</a>                     name = line.substring(0, colon).trim();
<a name="203" href="#203">203</a>                     value = <strong>new</strong> StringBuffer(line.substring(colon + 1).trim());
<a name="204" href="#204">204</a>                 }
<a name="205" href="#205">205</a>                 <em class="comment">// END HERITRIX change.</em>
<a name="206" href="#206">206</a>                 
<a name="207" href="#207">207</a>             }
<a name="208" href="#208">208</a> 
<a name="209" href="#209">209</a>         }
<a name="210" href="#210">210</a> 
<a name="211" href="#211">211</a>         <em class="comment">// make sure we save the last name,value pair if present</em>
<a name="212" href="#212">212</a>         <strong>if</strong> (name != <strong>null</strong>) {
<a name="213" href="#213">213</a>             headers.add(<strong>new</strong> Header(name, value.toString()));
<a name="214" href="#214">214</a>         }
<a name="215" href="#215">215</a>         
<a name="216" href="#216">216</a>         <strong>return</strong> (Header[]) headers.toArray(<strong>new</strong> Header[headers.size()]);    
<a name="217" href="#217">217</a>     }
<a name="218" href="#218">218</a> 
<a name="219" href="#219">219</a>     <em>/**<em>*</em></em>
<a name="220" href="#220">220</a> <em>     * Parses headers from the given stream.  Headers with the same name are not</em>
<a name="221" href="#221">221</a> <em>     * combined.</em>
<a name="222" href="#222">222</a> <em>     * </em>
<a name="223" href="#223">223</a> <em>     * @param is the stream to read headers from</em>
<a name="224" href="#224">224</a> <em>     * </em>
<a name="225" href="#225">225</a> <em>     * @return an array of headers in the order in which they were parsed</em>
<a name="226" href="#226">226</a> <em>     * </em>
<a name="227" href="#227">227</a> <em>     * @throws IOException if an IO error occurs while reading from the stream</em>
<a name="228" href="#228">228</a> <em>     * @throws HttpException if there is an error parsing a header value</em>
<a name="229" href="#229">229</a> <em>     * </em>
<a name="230" href="#230">230</a> <em>     * @deprecated use #parseHeaders(InputStream, String)</em>
<a name="231" href="#231">231</a> <em>     */</em>
<a name="232" href="#232">232</a>     <strong>public</strong> <strong>static</strong> Header[] parseHeaders(InputStream is) throws IOException, HttpException {
<a name="233" href="#233">233</a>         LOG.trace(<span class="string">"enter HeaderParser.parseHeaders(InputStream, String)"</span>);
<a name="234" href="#234">234</a>         <strong>return</strong> parseHeaders(is, <span class="string">"US-ASCII"</span>);
<a name="235" href="#235">235</a>     }
<a name="236" href="#236">236</a> }
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