source: trunk/Distribution/SW/FOP/build/site/servlets.html

Last change on this file was 2, checked in by jkacer, 18 years ago

Added all DocBook Framework stuff:

  • DocBook DTD
  • Transformation software FOP 0.20.5 and Saxon 6
  • XSL styles
  • Rexx scripts

Also added some WarpIN-related stuff for creation of WarpIN installation packages.
This state corresponds to version 1.0.0 from November 2005, just slightly modified to carry versioning information (Rexx scripts).
File size: 23.0 KB
Line 
1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2<html>
3<head>
4<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
5<title>Servlets</title>
6<link type="text/css" href="skin/page.css" rel="stylesheet">
7</head>
8<body text="#000000" bgcolor="#FFFFFF">
9<!--================= start Navigation Path ==================-->
10<table summary="navigation path" width="100%" border="0" cellpadding="0" cellspacing="0">
11<tr>
12<td nowrap="nowrap" valign="middle" bgcolor="#CFDCED" height="20"><img height="1" width="5" alt="" border="0" src="skin/images/spacer.gif"><!--===== breadcrumb trail (javascript-generated) ====--><font size="2" face="Arial, Helvetica, Sans-serif"><script src="skin/breadcrumbs.js" language="JavaScript" type="text/javascript"></script></font></td>
13</tr>
14<tr>
15<td bgcolor="#4C6C8F" height="2"><img height="2" width="2" alt="" border="0" src="skin/images/spacer.gif"></td>
16</tr>
17</table>
18<!--================= end Navigation Path ==================-->
19<!--================= start Banner ==================-->
20<table summary="header with logos" width="100%" border="0" cellpadding="0" cellspacing="0">
21<tr>
22<!--================= start Group Logo ==================-->
23<td bgcolor="#294563"><a href="http://xml.apache.org/"><img border="0" class="logoImage" alt="Apache XML" src="images/group-logo.gif"></a></td>
24<!--================= end Group Logo ==================-->
25<!--================= start Project Logo ==================--><td width="100%" align="center" bgcolor="#294563"><a href="http://xml.apache.org/fop/"><img border="0" class="logoImage" alt="FOP" src="images/logo.jpg"></a></td>
26<!--================= end Project Logo ==================-->
27<!--================= start Search ==================--><td valign="top" rowspan="2" bgcolor="#294563">
28<form target="_blank" action="http://www.google.com/search" method="get">
29<table summary="search" border="0" cellspacing="0" cellpadding="0" bgcolor="#4C6C8F">
30<tr>
31<td colspan="3"><img height="10" width="1" alt="" src="skin/images/spacer.gif"></td>
32</tr>
33<tr>
34<td><img height="1" width="1" alt="" src="skin/images/spacer.gif"></td><td nowrap="nowrap"><input value="xml.apache.org" name="sitesearch" type="hidden"><input size="15" name="q" id="query" type="text"><img height="1" width="5" alt="" src="skin/images/spacer.gif"><input name="Search" value="Search" type="submit">
35<br>
36<font face="Arial, Helvetica, Sans-serif" size="2" color="white">
37 the Apache XML site
38
39
40 </font></td><td><img height="1" width="1" alt="" src="skin/images/spacer.gif"></td>
41</tr>
42<tr>
43<td><img alt="" border="0" height="10" width="9" src="skin/images/search-left.gif"></td><td><img height="1" width="1" alt="" src="skin/images/spacer.gif"></td><td><img alt="" border="0" height="10" width="9" src="skin/images/search-right.gif"></td>
44</tr>
45</table>
46</form>
47</td>
48<!--================= start Search ==================--><td bgcolor="#294563"><img height="10" width="10" alt="" src="skin/images/spacer.gif"></td>
49</tr>
50<tr>
51<td valign="bottom" bgcolor="#294563" colspan="2">
52<!--================= start Tabs ==================-->
53<div class="tab">
54<table summary="tab bar" border="0" cellpadding="0" cellspacing="0">
55<tr>
56<td width="8"><img alt="" height="8" width="8" src="skin/images/spacer.gif"></td><td valign="bottom">
57<table summary="selected tab" style="height: 1.7em" border="0" cellpadding="0" cellspacing="0">
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59<td valign="top" width="5" bgcolor="#4C6C8F"><img height="5" width="5" alt="" src="skin/images/tabSel-left.gif"></td><td valign="middle" bgcolor="#4C6C8F"><font color="#ffffff" size="2" face="Arial, Helvetica, Sans-serif"><b><a href="index.html"><font color="#000000">Home</font></a></b></font></td><td valign="top" width="5" bgcolor="#4C6C8F"><img height="5" width="5" alt="" src="skin/images/tabSel-right.gif"></td>
60</tr>
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63<table summary="non selected tab" style="height: 1.6em" border="0" cellpadding="0" cellspacing="0">
64<tr>
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66</tr>
67</table>
68</td>
69</tr>
70</table>
71</div>
72<!--================= end Tabs ==================-->
73</td><td bgcolor="#294563"><img alt="" width="1" height="1" src="skin/images/spacer.gif"></td>
74</tr>
75<tr>
76<td bgcolor="#4C6C8F" colspan="4"><img width="1" height="10" alt="" src="skin/images/spacer.gif"></td>
77</tr>
78</table>
79<!--================= end Banner ==================-->
80<!--================= start Menu, NavBar, Content ==================-->
81<table summary="page content" bgcolor="#ffffff" width="100%" border="0" cellpadding="0" cellspacing="0">
82<tr>
83<td valign="top">
84<table summary="menu" border="0" cellspacing="0" cellpadding="0">
85<tr>
86<!--================= start left top NavBar ==================-->
87<td rowspan="3" valign="top">
88<table summary="blue line" border="0" cellpadding="0" cellspacing="0">
89<tr>
90<td bgcolor="#294563"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td>
91</tr>
92<tr>
93<td bgcolor="#CFDCED"><font color="#4C6C8F" size="4" face="Arial, Helvetica, Sans-serif">&nbsp;</font></td>
94</tr>
95<tr>
96<td bgcolor="#294563"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td>
97</tr>
98</table>
99</td>
100<!--================= end left top NavBar ==================--><td bgcolor="#294563"><img width="1" height="1" alt="" src="skin/images/spacer.gif"></td><td valign="bottom" bgcolor="#4C6C8F"><img width="10" height="10" alt="" src="skin/images/spacer.gif"></td><td nowrap="nowrap" valign="top" bgcolor="#4C6C8F">
101<!--================= start Menu items ==================-->
102<div class="menu">
103<ul>
104<li>
105<font color="#CFDCED">Home</font>
106<ul>
107
108<li>
109<a href="index.html">Introduction</a>
110</li>
111
112</ul>
113</li>
114<li>
115<font color="#CFDCED">Using FOP</font>
116<ul>
117
118<li>
119<a href="relnotes.html">Release Notes</a>
120</li>
121
122<li>
123<a href="download.html">Download</a>
124</li>
125
126<li>
127<a href="compiling.html">Build</a>
128</li>
129
130<li>
131<a href="configuration.html">Configure</a>
132</li>
133
134<li>
135<a href="running.html">Run</a>
136</li>
137
138<li>
139<a href="embedding.html">Embed</a>
140</li>
141
142<li>
143<span class="sel"><font color="#ffcc00">Servlets</font></span>
144</li>
145
146<li>
147<a href="anttask.html">Ant task</a>
148</li>
149
150</ul>
151</li>
152<li>
153<font color="#CFDCED">Features</font>
154<ul>
155
156<li>
157<a href="compliance.html">Compliance</a>
158</li>
159
160<li>
161<a href="output.html">Output Targets</a>
162</li>
163
164<li>
165<a href="pdfencryption.html">PDF encryption</a>
166</li>
167
168<li>
169<a href="graphics.html">Graphics</a>
170</li>
171
172<li>
173<a href="fonts.html">Fonts</a>
174</li>
175
176<li>
177<a href="hyphenation.html">Hyphenation</a>
178</li>
179
180<li>
181<a href="extensions.html">Extensions</a>
182</li>
183
184</ul>
185</li>
186<li>
187<font color="#CFDCED">Resources</font>
188<ul>
189
190<li>
191<a href="gethelp.html">Getting Help</a>
192</li>
193
194<li>
195<a href="faq.html">FAQs</a>
196</li>
197
198<li>
199<a href="fo.html">XSL-FO</a>
200</li>
201
202<li>
203<a href="examples.html">Examples</a>
204</li>
205
206<li>
207<a href="maillist.html">Mailing Lists</a>
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216</li>
217
218<li>
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220</li>
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225<font color="#CFDCED">Project</font>
226<ul>
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238</li>
239
240
241<li>
242<a href="team.html">Team</a>
243</li>
244
245</ul>
246</li>
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248</div>
249<!--================= end Menu items ==================-->
250</td><td valign="bottom" bgcolor="#4C6C8F"><img width="10" height="10" alt="" src="skin/images/spacer.gif"></td><td bgcolor="#294563"><img width="1" height="1" alt="" src="skin/images/spacer.gif"></td>
251</tr>
252<tr>
253<td valign="bottom" align="left" colspan="2" rowspan="2" bgcolor="#4C6C8F"><img height="10" width="10" border="0" alt="" src="skin/images/menu-left.gif"></td><td bgcolor="#4C6C8F"><img height="10" width="10" border="0" alt="" src="skin/images/spacer.gif"></td><td valign="bottom" align="right" colspan="2" rowspan="2" bgcolor="#4C6C8F"><img height="10" width="10" border="0" alt="" src="skin/images/menu-right.gif"></td>
254</tr>
255<tr>
256<td height="1" bgcolor="#294563"><img width="1" height="1" alt="" src="skin/images/spacer.gif"></td>
257</tr>
258</table>
259</td><td valign="top" width="100%">
260<table summary="content" width="100%" border="0" cellpadding="0" cellspacing="0">
261<!--================= start middle NavBar ==================-->
262<tr>
263<td colspan="4" bgcolor="#294563"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td>
264</tr>
265<tr>
266<td align="left" width="10" bgcolor="#CFDCED"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td><td align="left" width="50%" bgcolor="#CFDCED"><font color="#4C6C8F" size="3" face="Arial, Helvetica, Sans-serif">
267 &nbsp;
268
269 </font><img width="10" height="8" alt="" src="skin/images/spacer.gif"></td><td align="right" width="50%" bgcolor="#CFDCED"><font color="#4C6C8F" size="3" face="Arial, Helvetica, Sans-serif">
270 &nbsp;
271
272 </font><img width="10" height="8" alt="" src="skin/images/spacer.gif"></td><td width="10" bgcolor="#CFDCED"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td>
273</tr>
274<tr>
275<td colspan="4" bgcolor="#294563"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td>
276</tr>
277<!--================= end middle NavBar ==================-->
278<!--================= start Content==================-->
279<tr>
280<td align="left" width="10"><img width="10" height="1" alt="" src="skin/images/spacer.gif"></td><td align="left" width="100%">
281<div class="content">
282<table class="title" summary="">
283<tr>
284<td valign="middle">
285<h1>Servlets</h1>
286</td><td nowrap="nowrap" width="80" align="center"><a class="dida" href="servlets.pdf"><img alt="printer" src="skin/images/printer.gif" border="0"><br>
287 print-friendly<br>
288 PDF</a></td>
289</tr>
290</table>
291<h3>How to use FOP in a Servlet</h3>
292<ul class="minitoc">
293<li>
294<a href="#overview">Overview</a>
295</li>
296<li>
297<a href="#example-servlets">Example Servlets in the FOP distribution</a>
298</li>
299<li>
300<a href="#servlet">Create your own Servlet</a>
301<ul class="minitoc">
302<li>
303<a href="#minimal-servlet">A minimal Servlet</a>
304</li>
305<li>
306<a href="#xslt">Adding XSL tranformation (XSLT)</a>
307</li>
308<li>
309<a href="#cfg">Custom configuration</a>
310</li>
311<li>
312<a href="#performance">Improving performance</a>
313</li>
314</ul>
315</li>
316<li>
317<a href="#ie">Notes on Microsoft Internet Explorer</a>
318</li>
319<li>
320<a href="#servlet-engine">Servlet Engines</a>
321<ul class="minitoc">
322<li>
323<a href="#tomcat">Tomcat</a>
324</li>
325<li>
326<a href="#websphere">WebSphere 3.5</a>
327</li>
328</ul>
329</li>
330<li>
331<a href="#complex-usecases">Handling complex use cases</a>
332</li>
333</ul>
334
335<a name="N101C1"></a><a name="overview"></a>
336<h3>Overview</h3>
337<div style="margin-left: 0 ; border: 2px">
338<p>
339 This page discusses topic all around using FOP in a servlet environment.
340 </p>
341</div>
342
343<a name="N101CB"></a><a name="example-servlets"></a>
344<h3>Example Servlets in the FOP distribution</h3>
345<div style="margin-left: 0 ; border: 2px">
346<p>
347 In the directory {fop-dir}/examples/servlet, you'll find a working example
348 of a FOP-enabled servlet.
349 </p>
350<p>
351 You can build the servlet easily by using the supplied Ant script. After building
352 the servlet, drop fop.war into the webapps directory of Tomcat. Then, you can use
353 URLs like the following to generate PDF files:
354 </p>
355<ul>
356
357<li>http://localhost:8080/fop/fop?fo=/home/path/to/fofile.fo</li>
358
359<li>http://localhost:8080/fop/fop?xml=/home/path/to/xmlfile.xml&amp;xsl=/home/path/to/xslfile.xsl</li>
360
361</ul>
362<p></p>
363<p>The source code for the servlet can be found under {fop-dir}/examples/servlet/src/FopServlet.java.</p>
364</div>
365
366<a name="N101E6"></a><a name="servlet"></a>
367<h3>Create your own Servlet</h3>
368<div style="margin-left: 0 ; border: 2px">
369<div class="frame note">
370<div class="label">Note</div>
371<div class="content">
372 This section assumes you are familiar with <a href="embedding.html">embedding FOP</a>.
373 </div>
374</div>
375<a name="N101F3"></a><a name="minimal-servlet"></a>
376<h4>A minimal Servlet</h4>
377<div style="margin-left: 0 ; border: 2px">
378<p>
379 Here is a minimal code snippet to demonstrate the basics:
380 </p>
381<pre class="code">public void doGet(HttpServletRequest request,
382 HttpServletResponse response) throws ServletException {
383 try {
384 response.setContentType("application/pdf");
385 Driver driver = new Driver(new InputSource("foo.fo"),
386 response.getOutputStream());
387 driver.setRenderer(Driver.RENDER_PDF);
388 driver.run();
389 } catch (Exception ex) {
390 throw new ServletException(ex);
391 }
392}</pre>
393<div class="frame note">
394<div class="label">Note</div>
395<div class="content">
396 There are numerous problems with the code snippet above.
397 Its purpose is only to demonstrate the basic concepts.
398 See below for details.
399 </div>
400</div>
401</div>
402<a name="N10204"></a><a name="xslt"></a>
403<h4>Adding XSL tranformation (XSLT)</h4>
404<div style="margin-left: 0 ; border: 2px">
405<p>
406 A common requirement is the to transform an XML source to
407 XSLFO using an XSL transformation. It is recommended to use
408 JAXP for this task. The following snippet shows the basic
409 code:
410 </p>
411<pre class="code">
412protected Logger log;
413protected TransformerFactory transformerFactory;
414
415public void init() throws ServletException {
416 this.log = new ConsoleLogger(ConsoleLogger.LEVEL_WARN);
417 this.transformerFactory = TransformerFactory.newInstance();
418}
419
420[..]
421
422 //Setup FOP
423 Driver driver = new Driver();
424 driver.setLogger(this.log);
425 driver.setRenderer(Driver.RENDER_PDF);
426
427 //Setup a buffer to obtain the content length
428 ByteArrayOutputStream out = new ByteArrayOutputStream();
429 driver.setOutputStream(out);
430
431 //Setup Transformer
432 Source xsltSrc = new StreamSource(new File("foo-xml2fo.xsl"));
433 Transformer transformer = this.transformerFactory.newTransformer(xsltSrc);
434
435 //Make sure the XSL transformation's result is piped through to FOP
436 Result res = new SAXResult(driver.getContentHandler());
437
438 //Setup input
439 Source src = new StreamSource(new File("foo.xml"));
440
441 //Start the transformation and rendering process
442 transformer.transform(src, res);
443
444 //Prepare response
445 response.setContentType("application/pdf");
446 response.setContentLength(out.size());
447
448 //Send content to Browser
449 response.getOutputStream().write(out.toByteArray());
450 response.getOutputStream().flush();</pre>
451<div class="frame note">
452<div class="label">Note</div>
453<div class="content">
454 Buffering the generated PDF in a ByteArrayOutputStream is done to avoid potential
455 problems with the Acrobat Reader Plug-in in IEx.
456 </div>
457</div>
458<p>
459 The <span class="codefrag">Source</span> instance used above is simply an
460 example. If you have to read the XML from a string, supply
461 a <span class="codefrag">new StreamSource(new
462 StringReader(xmlstring))</span>. Constructing and reparsing
463 an XML string is generally less desirable than using a
464 SAXSource if you generate your XML. You can alternatively
465 supply a DOMSource as well. You may also use dynamically
466 generated XSL if you like.
467 </p>
468<p>
469 Because you have an explicit <span class="codefrag">Transformer</span> object, you can also use it to
470 explicitly set parameters for the transformation run.
471 </p>
472</div>
473<a name="N10224"></a><a name="cfg"></a>
474<h4>Custom configuration</h4>
475<div style="margin-left: 0 ; border: 2px">
476<p>
477 If you need to supply a special configuration do this in the <span class="codefrag">init()</span>
478 method so it will only be done once and to avoid multithreading problems.
479 </p>
480<pre class="code">public void init() throws ServletException {
481 [..]
482 new Options(new File("userconfig.xml"));
483 //or
484 Configuration.put("baseDir", "/my/base/dir");
485}</pre>
486</div>
487<a name="N10235"></a><a name="performance"></a>
488<h4>Improving performance</h4>
489<div style="margin-left: 0 ; border: 2px">
490<p>
491 There are several options to consider:
492 </p>
493<ul>
494
495<li>
496 Instead of java.io.ByteArrayOutputStream consider using the ByteArrayOutputStream
497 implementation from the Jakarta Commons IO project which allocates less memory.
498 </li>
499
500<li>
501 In certain cases it can help to write the generated PDF to a temporary file so
502 you can quickly reuse the file. This is especially useful, if Internet Explorer
503 calls the servlet multiple times with the same request or if you often generate
504 equal PDFs.
505 </li>
506
507</ul>
508<p>
509 Of course, the
510 <a href="embedding.html#performance">performance hints from the Embedding page</a>
511 apply here, too.
512 </p>
513</div>
514</div>
515
516<a name="N10250"></a><a name="ie"></a>
517<h3>Notes on Microsoft Internet Explorer</h3>
518<div style="margin-left: 0 ; border: 2px">
519<p>
520 Some versions of Internet Explorer will not automatically show the PDF or call the servlet multiple times.
521 These are well-known limitations of Internet Explorer and are not a problem of the servlet.
522 However, Internet Explorer can still be used to download the PDF so that it can be viewed later.
523 Here are some suggestions in this context:
524 </p>
525<ul>
526
527<li>
528 Use an URL ending in <span class="codefrag">.pdf</span>, like
529 <span class="codefrag">http://myserver/servlet/stuff.pdf</span>. Yes, the servlet can
530 be configured to handle this. If the URL has to contain parameters,
531 try to have <strong>both</strong> the base URL as well as the last parameter end in
532 <span class="codefrag">.pdf</span>, if necessary append a dummy parameter, like
533 <span class="codefrag">http://myserver/servlet/stuff.pdf?par1=a&amp;par2=b&amp;d=.pdf</span>. The
534 effect may depend on IEx version.
535 </li>
536
537<li>
538 Give IEx the opportunity to cache. In particular, ensure the
539 server does not set any headers causing IEx not to cache the
540 content. This may be a real problem if the document is sent
541 over HTTPS, because most IEx installations will by default
542 <em>not</em> cache any content retrieved over HTTPS.
543 Setting the <span class="codefrag">Expires</span> header entry may help in
544 this case:<br>
545<span class="codefrag">response.setDateHeader("Expires",
546 System.currentTimeMillis() + cacheExpiringDuration *
547 1000);</span>
548<br> Consult your server manual and the
549 relevant RFCs for further details on HTTP headers and
550 caching.
551 </li>
552
553<li>
554 Cache in the server. It may help to include a parameter in
555 the URL which has a timestamp as the value min order to
556 decide whether a request is repeated. IEx is reported to
557 retrieve a document up to three times, but never more often.
558 </li>
559
560</ul>
561</div>
562
563<a name="N10281"></a><a name="servlet-engine"></a>
564<h3>Servlet Engines</h3>
565<div style="margin-left: 0 ; border: 2px">
566<p>
567 When using a servlet engine, there are potential CLASSPATH issues, and potential conflicts
568 with existing XML/XSLT libraries. Servlet containers also often use their own classloaders
569 for loading webapps, which can cause bugs and security problems.
570 </p>
571<a name="N1028A"></a><a name="tomcat"></a>
572<h4>Tomcat</h4>
573<div style="margin-left: 0 ; border: 2px">
574<p>
575 Check Tomcat's documentation for detailed instructions about installing FOP and Cocoon.
576 There are known bugs that must be addressed, particularly for Tomcat 4.0.3.
577 </p>
578</div>
579<a name="N10294"></a><a name="websphere"></a>
580<h4>WebSphere 3.5</h4>
581<div style="margin-left: 0 ; border: 2px">
582<p>
583 Put a copy of a working parser in some directory where WebSphere can access it.
584 For example, if /usr/webapps/yourapp/servlets is the CLASSPATH for your servlets,
585 copy the Xerces jar into it (any other directory would also be fine).
586 Do not add the jar to the servlet CLASSPATH, but add it to the CLASSPATH of the
587 application server which contains your web application.
588 In the WebSphere administration console, click on the "environment" button in the
589 "general" tab. In the "variable name" box, enter "CLASSPATH".
590 In the "value" box, enter the correct path to the parser jar file
591 (/usr/webapps/yourapp/servlets/Xerces.jar in our example here).
592 Press "OK", then apply the change and restart the application server.
593 </p>
594</div>
595</div>
596
597<a name="N1029F"></a><a name="complex-usecases"></a>
598<h3>Handling complex use cases</h3>
599<div style="margin-left: 0 ; border: 2px">
600<p>
601 Sometimes the requirements for a servlet get quite sophisticated: SQL data sources,
602 multiple XSL transformations, merging of several datasources etc. In such a case
603 consider using <a target="_blank" href="http://cocoon.apache.org">Apache Cocoon</a> instead
604 of a custom servlet to accomplish your goal.
605 </p>
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