scriptaction.html

框架结构,适用一些初学者使用． 请先压缩再使用

<a name="165" href="#165">165</a>                 String ext = props.getProperty(ENGINE_BASE + type
<a name="166" href="#166">166</a>                          + <span class="string">".extensions"</span>, <span class="string">""</span>);
<a name="167" href="#167">167</a>                 String[] exts = split(ext, <span class="string">","</span>);
<a name="168" href="#168">168</a>                 <strong>if</strong> (LOG.isInfoEnabled()) {
<a name="169" href="#169">169</a>                     LOG.info(<span class="string">"Loading BSF engine name:"</span> + type + <span class="string">" class:"</span>
<a name="170" href="#170">170</a>                              + cls + <span class="string">" ext:"</span> + ext);
<a name="171" href="#171">171</a>                 }
<a name="172" href="#172">172</a>                 BSFManager.registerScriptingEngine(type, cls, exts);
<a name="173" href="#173">173</a>             }
<a name="174" href="#174">174</a>         }
<a name="175" href="#175">175</a>         filters = loadFilters(props);
<a name="176" href="#176">176</a>     }
<a name="177" href="#177">177</a> 
<a name="178" href="#178">178</a> 
<a name="179" href="#179">179</a>     <em>/**<em>*</em></em>
<a name="180" href="#180">180</a> <em>     *  Executes the script.</em>
<a name="181" href="#181">181</a> <em>     *</em>
<a name="182" href="#182">182</a> <em>     *@param  mapping        The action mapping</em>
<a name="183" href="#183">183</a> <em>     *@param  form           The action form</em>
<a name="184" href="#184">184</a> <em>     *@param  request        The request object</em>
<a name="185" href="#185">185</a> <em>     *@param  response       The response object</em>
<a name="186" href="#186">186</a> <em>     *@return                The action forward</em>
<a name="187" href="#187">187</a> <em>     *@exception  Exception  If something goes wrong</em>
<a name="188" href="#188">188</a> <em>     */</em>
<a name="189" href="#189">189</a>     <strong>public</strong> ActionForward execute(ActionMapping mapping,
<a name="190" href="#190">190</a>             ActionForm form,
<a name="191" href="#191">191</a>             HttpServletRequest request,
<a name="192" href="#192">192</a>             HttpServletResponse response)
<a name="193" href="#193">193</a>              throws Exception {
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>         BSFManager bsfManager = <strong>new</strong> BSFManager();
<a name="196" href="#196">196</a> 
<a name="197" href="#197">197</a>         String scriptName = <strong>null</strong>;
<a name="198" href="#198">198</a>         <strong>try</strong> {
<a name="199" href="#199">199</a>             scriptName = parseScriptName(mapping.getParameter(), bsfManager);
<a name="200" href="#200">200</a>         } <strong>catch</strong> (Exception ex) {
<a name="201" href="#201">201</a>             LOG.error(<span class="string">"Unable to parse "</span> + mapping.getParameter(), ex);
<a name="202" href="#202">202</a>             <strong>throw</strong> <strong>new</strong> Exception(<span class="string">"Unable to parse "</span> + mapping.getParameter());
<a name="203" href="#203">203</a>         }
<a name="204" href="#204">204</a>         <strong>if</strong> (scriptName == <strong>null</strong>) {
<a name="205" href="#205">205</a>             LOG.error(<span class="string">"No script specified in the parameter attribute"</span>);
<a name="206" href="#206">206</a>             <strong>throw</strong> <strong>new</strong> Exception(<span class="string">"No script specified"</span>);
<a name="207" href="#207">207</a>         }
<a name="208" href="#208">208</a> 
<a name="209" href="#209">209</a>         <strong>if</strong> (LOG.isDebugEnabled()) {
<a name="210" href="#210">210</a>             LOG.debug(<span class="string">"Executing script: "</span> + scriptName);
<a name="211" href="#211">211</a>         }
<a name="212" href="#212">212</a> 
<a name="213" href="#213">213</a>         HttpSession session = request.getSession();
<a name="214" href="#214">214</a>         ServletContext application = getServlet().getServletContext();
<a name="215" href="#215">215</a> 
<a name="216" href="#216">216</a>         Script script = loadScript(scriptName, application);
<a name="217" href="#217">217</a> 
<a name="218" href="#218">218</a>         bsfManager.declareBean(<span class="string">"request"</span>, request,
<a name="219" href="#219">219</a>                 HttpServletRequest.<strong>class</strong>);
<a name="220" href="#220">220</a> 
<a name="221" href="#221">221</a>         bsfManager.declareBean(<span class="string">"response"</span>, response,
<a name="222" href="#222">222</a>                 HttpServletResponse.<strong>class</strong>);
<a name="223" href="#223">223</a> 
<a name="224" href="#224">224</a>         <strong>if</strong> (session == <strong>null</strong>) {
<a name="225" href="#225">225</a>             LOG.debug(<span class="string">"HTTP session is null"</span>);
<a name="226" href="#226">226</a>         } <strong>else</strong> {
<a name="227" href="#227">227</a>             bsfManager.declareBean(<span class="string">"session"</span>, session, HttpSession.<strong>class</strong>);
<a name="228" href="#228">228</a>         }
<a name="229" href="#229">229</a> 
<a name="230" href="#230">230</a>         bsfManager.declareBean(<span class="string">"application"</span>, application,
<a name="231" href="#231">231</a>                 ServletContext.<strong>class</strong>);
<a name="232" href="#232">232</a> 
<a name="233" href="#233">233</a>         bsfManager.declareBean(<span class="string">"log"</span>, LOG, Log.<strong>class</strong>);
<a name="234" href="#234">234</a>         <a href="../../../../org/apache/struts/scripting/StrutsInfo.html">StrutsInfo</a> struts = <strong>new</strong> <a href="../../../../org/apache/struts/scripting/StrutsInfo.html">StrutsInfo</a>(<strong>this</strong>, mapping, form,
<a name="235" href="#235">235</a>                 getResources(request));
<a name="236" href="#236">236</a>         bsfManager.declareBean(<span class="string">"struts"</span>, struts, StrutsInfo.<strong>class</strong>);
<a name="237" href="#237">237</a> 
<a name="238" href="#238">238</a>         <strong>for</strong> (<strong>int</strong> x = 0; x &lt; filters.length; x++) {
<a name="239" href="#239">239</a>             filters[x].apply(bsfManager);
<a name="240" href="#240">240</a>         }
<a name="241" href="#241">241</a> 
<a name="242" href="#242">242</a>         bsfManager.exec(script.lang, script.file.getCanonicalPath(), 0, 0,
<a name="243" href="#243">243</a>                 script.string);
<a name="244" href="#244">244</a> 
<a name="245" href="#245">245</a>         ActionForward af = struts.getForward();
<a name="246" href="#246">246</a>         <strong>return</strong> af;
<a name="247" href="#247">247</a>     }
<a name="248" href="#248">248</a> 
<a name="249" href="#249">249</a> 
<a name="250" href="#250">250</a>     <em>/**<em>*</em></em>
<a name="251" href="#251">251</a> <em>     *  Parses the script name and puts any url parameters in the context.</em>
<a name="252" href="#252">252</a> <em>     *</em>
<a name="253" href="#253">253</a> <em>     *@param  url            The script url consisting of a path and optional</em>
<a name="254" href="#254">254</a> <em>     *      parameters</em>
<a name="255" href="#255">255</a> <em>     *@param  manager        The BSF manager to declare new parameters in</em>
<a name="256" href="#256">256</a> <em>     *@return                The name of the script to execute</em>
<a name="257" href="#257">257</a> <em>     *@exception  Exception  If something goes wrong</em>
<a name="258" href="#258">258</a> <em>     */</em>
<a name="259" href="#259">259</a>     <strong>protected</strong> String parseScriptName(String url, BSFManager manager)
<a name="260" href="#260">260</a>              throws Exception {
<a name="261" href="#261">261</a>         <strong>if</strong> (LOG.isDebugEnabled()) {
<a name="262" href="#262">262</a>             LOG.debug(<span class="string">"Parsing "</span> + url);
<a name="263" href="#263">263</a>         }
<a name="264" href="#264">264</a>         String name = <strong>null</strong>;
<a name="265" href="#265">265</a>         <strong>if</strong> (url != <strong>null</strong>) {
<a name="266" href="#266">266</a>             String[] parsed = split(url, <span class="string">"?"</span>);
<a name="267" href="#267">267</a>             name = parsed[0];
<a name="268" href="#268">268</a>             <strong>if</strong> (parsed.length == 2) {
<a name="269" href="#269">269</a>                 <strong>if</strong> (LOG.isDebugEnabled()) {
<a name="270" href="#270">270</a>                     LOG.debug(<span class="string">"Found a query string"</span>);
<a name="271" href="#271">271</a>                 }
<a name="272" href="#272">272</a>                 String[] args = split(parsed[1], <span class="string">"&amp;"</span>);
<a name="273" href="#273">273</a>                 <strong>for</strong> (<strong>int</strong> x = 0; x &lt; args.length; x++) {
<a name="274" href="#274">274</a>                     String[] param = split(args[x], <span class="string">"="</span>);
<a name="275" href="#275">275</a>                     Object o = manager.lookupBean(param[0]);
<a name="276" href="#276">276</a>                     <strong>if</strong> (o != <strong>null</strong>) {
<a name="277" href="#277">277</a>                         LOG.warn(<span class="string">"BSF variable "</span> + param[0]
<a name="278" href="#278">278</a>                                  + <span class="string">" already exists"</span>);
<a name="279" href="#279">279</a>                         param[0] = <span class="string">"_"</span> + param[0];
<a name="280" href="#280">280</a>                     }
<a name="281" href="#281">281</a>                     manager.declareBean(param[0], param[1], String.<strong>class</strong>);
<a name="282" href="#282">282</a>                     <strong>if</strong> (LOG.isDebugEnabled()) {
<a name="283" href="#283">283</a>                         LOG.debug(<span class="string">"Registering param "</span> + param[0]
<a name="284" href="#284">284</a>                                  + <span class="string">" with value "</span> + param[1]);
<a name="285" href="#285">285</a>                     }
<a name="286" href="#286">286</a>                 }
<a name="287" href="#287">287</a>             } <strong>else</strong> {
<a name="288" href="#288">288</a>                 <strong>if</strong> (LOG.isDebugEnabled()) {
<a name="289" href="#289">289</a>                     LOG.debug(<span class="string">"No query string:"</span> + parsed.length);
<a name="290" href="#290">290</a>                 }
<a name="291" href="#291">291</a>             }
<a name="292" href="#292">292</a>         }
<a name="293" href="#293">293</a>         <strong>return</strong> name;
<a name="294" href="#294">294</a>     }
<a name="295" href="#295">295</a> 
<a name="296" href="#296">296</a> 
<a name="297" href="#297">297</a>     <em>/**<em>*</em></em>
<a name="298" href="#298">298</a> <em>     *  Loads the script from cache if possible. Reloads if the script has been</em>
<a name="299" href="#299">299</a> <em>     *  recently modified.</em>
<a name="300" href="#300">300</a> <em>     *</em>
<a name="301" href="#301">301</a> <em>     *@param  name     The name of the script</em>
<a name="302" href="#302">302</a> <em>     *@param  context  The servlet context</em>
<a name="303" href="#303">303</a> <em>     *@return          The script object</em>
<a name="304" href="#304">304</a> <em>     */</em>
<a name="305" href="#305">305</a>     <strong>protected</strong> Script loadScript(String name, ServletContext context) {
<a name="306" href="#306">306</a> 
<a name="307" href="#307">307</a>         Script script = (Script) scripts.get(name);
<a name="308" href="#308">308</a>         <strong>if</strong> (script == <strong>null</strong>) {
<a name="309" href="#309">309</a>             script = <strong>new</strong> Script();
<a name="310" href="#310">310</a>             script.file = <strong>new</strong> File(context.getRealPath(name));
<a name="311" href="#311">311</a>             <strong>try</strong> {
<a name="312" href="#312">312</a>                 script.lang =
<a name="313" href="#313">313</a>                         BSFManager.getLangFromFilename(script.file.getName());
<a name="314" href="#314">314</a>             } <strong>catch</strong> (BSFException ex) {
<a name="315" href="#315">315</a>                 LOG.warn(ex, ex);
<a name="316" href="#316">316</a>             }
<a name="317" href="#317">317</a>         }
<a name="318" href="#318">318</a> 
<a name="319" href="#319">319</a>         <strong>boolean</strong> reloadScript = false;
<a name="320" href="#320">320</a>         <strong>long</strong> scriptLastModified = script.file.lastModified();
<a name="321" href="#321">321</a>         <strong>if</strong> (scriptLastMod<strong>if</strong>ied > script.timeLastLoaded) {
<a name="322" href="#322">322</a>             <strong>if</strong> (LOG.isDebugEnabled()) {
<a name="323" href="#323">323</a>                 LOG.debug(<span class="string">"Loading updated or new script: "</span>
<a name="324" href="#324">324</a>                         + script.file.getName());
<a name="325" href="#325">325</a>             }
<a name="326" href="#326">326</a>             reloadScript = <strong>true</strong>;
<a name="327" href="#327">327</a>         }
<a name="328" href="#328">328</a> 
<a name="329" href="#329">329</a>         <strong>if</strong> (reloadScript || script.string == <strong>null</strong>) {
<a name="330" href="#330">330</a>             <strong>synchronized</strong> (<strong>this</strong>) {
<a name="331" href="#331">331</a>                 script.timeLastLoaded = System.currentTimeMillis();
<a name="332" href="#332">332</a>                 FileReader reader = <strong>null</strong>;
<a name="333" href="#333">333</a>                 <strong>try</strong> {
<a name="334" href="#334">334</a>                     reader = <strong>new</strong> FileReader(script.file);
<a name="335" href="#335">335</a>                     script.string = IOUtils.getStringFromReader(reader);
<a name="336" href="#336">336</a>                 } <strong>catch</strong> (IOException ex) {
<a name="337" href="#337">337</a>                     LOG.error(<span class="string">"Unable to load script: "</span> + script.file, ex);