heritrixprotocolsocketfactory.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="97" href="#97">97</a>  <em>     * determined</em>
<a name="98" href="#98">98</a>  <em>     * @throws ConnectTimeoutException if socket cannot be connected within the</em>
<a name="99" href="#99">99</a>  <em>     *  given time limit</em>
<a name="100" href="#100">100</a> <em>     *</em>
<a name="101" href="#101">101</a> <em>     * @since 3.0</em>
<a name="102" href="#102">102</a> <em>     */</em>
<a name="103" href="#103">103</a>     <strong>public</strong> Socket createSocket(
<a name="104" href="#104">104</a>         <strong>final</strong> String host,
<a name="105" href="#105">105</a>         <strong>final</strong> <strong>int</strong> port,
<a name="106" href="#106">106</a>         <strong>final</strong> InetAddress localAddress,
<a name="107" href="#107">107</a>         <strong>final</strong> <strong>int</strong> localPort,
<a name="108" href="#108">108</a>         <strong>final</strong> HttpConnectionParams params)
<a name="109" href="#109">109</a>     throws IOException, UnknownHostException, ConnectTimeoutException {
<a name="110" href="#110">110</a>         <em class="comment">// Below code is from the DefaultSSLProtocolSocketFactory#createSocket</em>
<a name="111" href="#111">111</a>         <em class="comment">// method only it has workarounds to deal with pre-1.4 JVMs.  I've</em>
<a name="112" href="#112">112</a>         <em class="comment">// cut these out.</em>
<a name="113" href="#113">113</a>         <strong>if</strong> (params == <strong>null</strong>) {
<a name="114" href="#114">114</a>             <strong>throw</strong> <strong>new</strong> IllegalArgumentException(<span class="string">"Parameters may not be null"</span>);
<a name="115" href="#115">115</a>         }
<a name="116" href="#116">116</a>         Socket socket = <strong>null</strong>;
<a name="117" href="#117">117</a>         <strong>int</strong> timeout = params.getConnectionTimeout();
<a name="118" href="#118">118</a>         <strong>if</strong> (timeout == 0) {
<a name="119" href="#119">119</a>             socket = createSocket(host, port, localAddress, localPort);
<a name="120" href="#120">120</a>         } <strong>else</strong> {
<a name="121" href="#121">121</a>             socket = <strong>new</strong> Socket();
<a name="122" href="#122">122</a>             <a href="../../../../org/archive/crawler/datamodel/ServerCache.html">ServerCache</a> cache = (ServerCache)params.
<a name="123" href="#123">123</a>                 getParameter(FetchHTTP.SERVER_CACHE_KEY);
<a name="124" href="#124">124</a>             InetAddress hostAddress =
<a name="125" href="#125">125</a>             	(cache != <strong>null</strong>)? getHostAddress(cache, host): <strong>null</strong>;
<a name="126" href="#126">126</a>             InetSocketAddress address = (hostAddress != <strong>null</strong>)?
<a name="127" href="#127">127</a>                     <strong>new</strong> InetSocketAddress(hostAddress, port):
<a name="128" href="#128">128</a>                     <strong>new</strong> InetSocketAddress(host, port);
<a name="129" href="#129">129</a>             socket.bind(<strong>new</strong> InetSocketAddress(localAddress, localPort));
<a name="130" href="#130">130</a>             <strong>try</strong> {
<a name="131" href="#131">131</a>                 socket.connect(address, timeout);
<a name="132" href="#132">132</a>             } <strong>catch</strong> (SocketTimeoutException e) {
<a name="133" href="#133">133</a>                 <em class="comment">// Add timeout info. to the exception.</em>
<a name="134" href="#134">134</a>                 <strong>throw</strong> <strong>new</strong> SocketTimeoutException(e.getMessage() +
<a name="135" href="#135">135</a>                     <span class="string">": timeout set at "</span> + Integer.toString(timeout) + <span class="string">"ms."</span>);
<a name="136" href="#136">136</a>             }
<a name="137" href="#137">137</a>             assert socket.isConnected(): <span class="string">"Socket not connected "</span> + host;
<a name="138" href="#138">138</a>         }
<a name="139" href="#139">139</a>         <strong>return</strong> socket;
<a name="140" href="#140">140</a>     }
<a name="141" href="#141">141</a>     
<a name="142" href="#142">142</a>     <em>/**<em>*</em></em>
<a name="143" href="#143">143</a> <em>     * Get host address using first the heritrix cache of addresses, then,</em>
<a name="144" href="#144">144</a> <em>     * failing that, go to the dnsjava cache.</em>
<a name="145" href="#145">145</a> <em>     * </em>
<a name="146" href="#146">146</a> <em>     * Default access and static so can be used by other classes in this</em>
<a name="147" href="#147">147</a> <em>     * package.</em>
<a name="148" href="#148">148</a> <em>     *</em>
<a name="149" href="#149">149</a> <em>     * @param host Host whose address we're to fetch.</em>
<a name="150" href="#150">150</a> <em>     * @return an IP address for this host or null if one can't be found</em>
<a name="151" href="#151">151</a> <em>     * in caches.</em>
<a name="152" href="#152">152</a> <em>     * @exception IOException If we fail to get host IP from ServerCache.</em>
<a name="153" href="#153">153</a> <em>     */</em>
<a name="154" href="#154">154</a>     <strong>static</strong> InetAddress getHostAddress(<strong>final</strong> <a href="../../../../org/archive/crawler/datamodel/ServerCache.html">ServerCache</a> cache,
<a name="155" href="#155">155</a>             <strong>final</strong> String host) throws IOException {
<a name="156" href="#156">156</a>         InetAddress result = <strong>null</strong>;
<a name="157" href="#157">157</a>         <strong>if</strong> (cache != <strong>null</strong>) {
<a name="158" href="#158">158</a>         	CrawlHost ch = cache.getHostFor(host);
<a name="159" href="#159">159</a>             <strong>if</strong> (ch != <strong>null</strong>) {
<a name="160" href="#160">160</a>                 result = ch.getIP();
<a name="161" href="#161">161</a>             }
<a name="162" href="#162">162</a>         }
<a name="163" href="#163">163</a>         <strong>if</strong> (result ==  <strong>null</strong>) {
<a name="164" href="#164">164</a>             <strong>throw</strong> <strong>new</strong> IOException(<span class="string">"Failed to get host "</span> + host +
<a name="165" href="#165">165</a>                 <span class="string">" address from ServerCache"</span>);
<a name="166" href="#166">166</a>         }
<a name="167" href="#167">167</a>         <strong>return</strong> result;
<a name="168" href="#168">168</a>     }
<a name="169" href="#169">169</a> 
<a name="170" href="#170">170</a>     <em>/**<em>*</em></em>
<a name="171" href="#171">171</a> <em>     * @see ProtocolSocketFactory#createSocket(java.lang.String,int)</em>
<a name="172" href="#172">172</a> <em>     */</em>
<a name="173" href="#173">173</a>     <strong>public</strong> Socket createSocket(String host, <strong>int</strong> port)
<a name="174" href="#174">174</a>             throws IOException, UnknownHostException {
<a name="175" href="#175">175</a>         <strong>return</strong> <strong>new</strong> Socket(host, port);
<a name="176" href="#176">176</a>     }
<a name="177" href="#177">177</a> 
<a name="178" href="#178">178</a>     <em>/**<em>*</em></em>
<a name="179" href="#179">179</a> <em>     * All instances of DefaultProtocolSocketFactory are the same.</em>
<a name="180" href="#180">180</a> <em>     * @param obj Object to compare.</em>
<a name="181" href="#181">181</a> <em>     * @return True if equal</em>
<a name="182" href="#182">182</a> <em>     */</em>
<a name="183" href="#183">183</a>     <strong>public</strong> <strong>boolean</strong> equals(Object obj) {
<a name="184" href="#184">184</a>         <strong>return</strong> ((obj != <strong>null</strong>) &amp;&amp;
<a name="185" href="#185">185</a>             obj.getClass().equals(HeritrixProtocolSocketFactory.<strong>class</strong>));
<a name="186" href="#186">186</a>     }
<a name="187" href="#187">187</a> 
<a name="188" href="#188">188</a>     <em>/**<em>*</em></em>
<a name="189" href="#189">189</a> <em>     * All instances of DefaultProtocolSocketFactory have the same hash code.</em>
<a name="190" href="#190">190</a> <em>     * @return Hash code for this object.</em>
<a name="191" href="#191">191</a> <em>     */</em>
<a name="192" href="#192">192</a>     <strong>public</strong> <strong>int</strong> hashCode() {
<a name="193" href="#193">193</a>         <strong>return</strong> HeritrixProtocolSocketFactory.<strong>class</strong>.hashCode();
<a name="194" href="#194">194</a>     }
<a name="195" href="#195">195</a> }
</pre>
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