/usr/share/doc/libservlet3.1-java/api/javax/servlet/Servlet.html is in libservlet3.1-java-doc 8.0.32-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!-- NewPage -->
<html>
<head>
<!-- Generated by javadoc -->
<title>Servlet (Tomcat API Documentation)</title>
<link rel="stylesheet" type="text/css" href="../../stylesheet.css" title="Style">
<script type="text/javascript" src="../../script.js"></script>
</head>
<body>
<script type="text/javascript"><!--
try {
if (location.href.indexOf('is-external=true') == -1) {
parent.document.title="Servlet (Tomcat API Documentation)";
}
}
catch(err) {
}
//-->
var methods = {"i0":6,"i1":6,"i2":6,"i3":6,"i4":6};
var tabs = {65535:["t0","All Methods"],2:["t2","Instance Methods"],4:["t3","Abstract Methods"]};
var altColor = "altColor";
var rowColor = "rowColor";
var tableTab = "tableTab";
var activeTableTab = "activeTableTab";
</script>
<noscript>
<div>JavaScript is disabled on your browser.</div>
</noscript>
<!-- ========= START OF TOP NAVBAR ======= -->
<div class="topNav"><a name="navbar.top">
<!-- -->
</a>
<div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div>
<a name="navbar.top.firstrow">
<!-- -->
</a>
<ul class="navList" title="Navigation">
<li><a href="../../overview-summary.html">Overview</a></li>
<li><a href="package-summary.html">Package</a></li>
<li class="navBarCell1Rev">Class</li>
<li><a href="package-tree.html">Tree</a></li>
<li><a href="../../deprecated-list.html">Deprecated</a></li>
<li><a href="../../index-all.html">Index</a></li>
<li><a href="../../help-doc.html">Help</a></li>
</ul>
</div>
<div class="subNav">
<ul class="navList">
<li><a href="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><span class="typeNameLink">Prev Class</span></a></li>
<li><a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet"><span class="typeNameLink">Next Class</span></a></li>
</ul>
<ul class="navList">
<li><a href="../../index.html?javax/servlet/Servlet.html" target="_top">Frames</a></li>
<li><a href="Servlet.html" target="_top">No Frames</a></li>
</ul>
<ul class="navList" id="allclasses_navbar_top">
<li><a href="../../allclasses-noframe.html">All Classes</a></li>
</ul>
<div>
<script type="text/javascript"><!--
allClassesLink = document.getElementById("allclasses_navbar_top");
if(window==top) {
allClassesLink.style.display = "block";
}
else {
allClassesLink.style.display = "none";
}
//-->
</script>
</div>
<div>
<ul class="subNavList">
<li>Summary: </li>
<li>Nested | </li>
<li>Field | </li>
<li>Constr | </li>
<li><a href="#method.summary">Method</a></li>
</ul>
<ul class="subNavList">
<li>Detail: </li>
<li>Field | </li>
<li>Constr | </li>
<li><a href="#method.detail">Method</a></li>
</ul>
</div>
<a name="skip.navbar.top">
<!-- -->
</a></div>
<!-- ========= END OF TOP NAVBAR ========= -->
<!-- ======== START OF CLASS DATA ======== -->
<div class="header">
<div class="subTitle">javax.servlet</div>
<h2 title="Interface Servlet" class="title">Interface Servlet</h2>
</div>
<div class="contentContainer">
<div class="description">
<ul class="blockList">
<li class="blockList">
<dl>
<dt>All Known Subinterfaces:</dt>
<dd><a href="../../javax/servlet/jsp/HttpJspPage.html" title="interface in javax.servlet.jsp">HttpJspPage</a>, <a href="../../javax/servlet/jsp/JspPage.html" title="interface in javax.servlet.jsp">JspPage</a></dd>
</dl>
<dl>
<dt>All Known Implementing Classes:</dt>
<dd><a href="../../javax/servlet/GenericServlet.html" title="class in javax.servlet">GenericServlet</a>, <a href="../../javax/servlet/http/HttpServlet.html" title="class in javax.servlet.http">HttpServlet</a></dd>
</dl>
<hr>
<br>
<pre>public interface <span class="typeNameLabel">Servlet</span></pre>
<div class="block">Defines methods that all servlets must implement.
<p>
A servlet is a small Java program that runs within a Web server. Servlets
receive and respond to requests from Web clients, usually across HTTP, the
HyperText Transfer Protocol.
<p>
To implement this interface, you can write a generic servlet that extends
<code>javax.servlet.GenericServlet</code> or an HTTP servlet that extends
<code>javax.servlet.http.HttpServlet</code>.
<p>
This interface defines methods to initialize a servlet, to service requests,
and to remove a servlet from the server. These are known as life-cycle
methods and are called in the following sequence:
<ol>
<li>The servlet is constructed, then initialized with the <code>init</code>
method.
<li>Any calls from clients to the <code>service</code> method are handled.
<li>The servlet is taken out of service, then destroyed with the
<code>destroy</code> method, then garbage collected and finalized.
</ol>
<p>
In addition to the life-cycle methods, this interface provides the
<code>getServletConfig</code> method, which the servlet can use to get any
startup information, and the <code>getServletInfo</code> method, which allows
the servlet to return basic information about itself, such as author,
version, and copyright.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../javax/servlet/GenericServlet.html" title="class in javax.servlet"><code>GenericServlet</code></a>,
<a href="../../javax/servlet/http/HttpServlet.html" title="class in javax.servlet.http"><code>HttpServlet</code></a></dd>
</dl>
</li>
</ul>
</div>
<div class="summary">
<ul class="blockList">
<li class="blockList">
<!-- ========== METHOD SUMMARY =========== -->
<ul class="blockList">
<li class="blockList"><a name="method.summary">
<!-- -->
</a>
<h3>Method Summary</h3>
<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/servlet/Servlet.html#destroy--">destroy</a></span>()</code>
<div class="block">Called by the servlet container to indicate to a servlet that the servlet
is being taken out of service.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet">ServletConfig</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/servlet/Servlet.html#getServletConfig--">getServletConfig</a></span>()</code>
<div class="block">Returns a <a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet"><code>ServletConfig</code></a> object, which contains initialization and
startup parameters for this servlet.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/servlet/Servlet.html#getServletInfo--">getServletInfo</a></span>()</code>
<div class="block">Returns information about the servlet, such as author, version, and
copyright.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/servlet/Servlet.html#init-javax.servlet.ServletConfig-">init</a></span>(<a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet">ServletConfig</a> config)</code>
<div class="block">Called by the servlet container to indicate to a servlet that the servlet
is being placed into service.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../javax/servlet/Servlet.html#service-javax.servlet.ServletRequest-javax.servlet.ServletResponse-">service</a></span>(<a href="../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</a> req,
<a href="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</a> res)</code>
<div class="block">Called by the servlet container to allow the servlet to respond to a
request.</div>
</td>
</tr>
</table>
</li>
</ul>
</li>
</ul>
</div>
<div class="details">
<ul class="blockList">
<li class="blockList">
<!-- ============ METHOD DETAIL ========== -->
<ul class="blockList">
<li class="blockList"><a name="method.detail">
<!-- -->
</a>
<h3>Method Detail</h3>
<a name="init-javax.servlet.ServletConfig-">
<!-- -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>init</h4>
<pre>void init(<a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet">ServletConfig</a> config)
throws <a href="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></pre>
<div class="block">Called by the servlet container to indicate to a servlet that the servlet
is being placed into service.
<p>
The servlet container calls the <code>init</code> method exactly once
after instantiating the servlet. The <code>init</code> method must
complete successfully before the servlet can receive any requests.
<p>
The servlet container cannot place the servlet into service if the
<code>init</code> method
<ol>
<li>Throws a <code>ServletException</code>
<li>Does not return within a time period defined by the Web server
</ol></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>config</code> - a <code>ServletConfig</code> object containing the servlet's
configuration and initialization parameters</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code> - if an exception has occurred that interferes with the
servlet's normal operation</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../javax/servlet/UnavailableException.html" title="class in javax.servlet"><code>UnavailableException</code></a>,
<a href="../../javax/servlet/Servlet.html#getServletConfig--"><code>getServletConfig()</code></a></dd>
</dl>
</li>
</ul>
<a name="getServletConfig--">
<!-- -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>getServletConfig</h4>
<pre><a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet">ServletConfig</a> getServletConfig()</pre>
<div class="block">Returns a <a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet"><code>ServletConfig</code></a> object, which contains initialization and
startup parameters for this servlet. The <code>ServletConfig</code>
object returned is the one passed to the <code>init</code> method.
<p>
Implementations of this interface are responsible for storing the
<code>ServletConfig</code> object so that this method can return it. The
<a href="../../javax/servlet/GenericServlet.html" title="class in javax.servlet"><code>GenericServlet</code></a> class, which implements this interface, already
does this.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the <code>ServletConfig</code> object that initializes this
servlet</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../javax/servlet/Servlet.html#init-javax.servlet.ServletConfig-"><code>init(javax.servlet.ServletConfig)</code></a></dd>
</dl>
</li>
</ul>
<a name="service-javax.servlet.ServletRequest-javax.servlet.ServletResponse-">
<!-- -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>service</h4>
<pre>void service(<a href="../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</a> req,
<a href="../../javax/servlet/ServletResponse.html" title="interface in javax.servlet">ServletResponse</a> res)
throws <a href="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a>,
java.io.IOException</pre>
<div class="block">Called by the servlet container to allow the servlet to respond to a
request.
<p>
This method is only called after the servlet's <code>init()</code> method
has completed successfully.
<p>
The status code of the response always should be set for a servlet that
throws or sends an error.
<p>
Servlets typically run inside multithreaded servlet containers that can
handle multiple requests concurrently. Developers must be aware to
synchronize access to any shared resources such as files, network
connections, and as well as the servlet's class and instance variables.
More information on multithreaded programming in Java is available in <a
href
="http://java.sun.com/Series/Tutorial/java/threads/multithreaded.html">
the Java tutorial on multi-threaded programming</a>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>req</code> - the <code>ServletRequest</code> object that contains the
client's request</dd>
<dd><code>res</code> - the <code>ServletResponse</code> object that contains the
servlet's response</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code> - if an exception occurs that interferes with the servlet's
normal operation</dd>
<dd><code>java.io.IOException</code> - if an input or output exception occurs</dd>
</dl>
</li>
</ul>
<a name="getServletInfo--">
<!-- -->
</a>
<ul class="blockList">
<li class="blockList">
<h4>getServletInfo</h4>
<pre>java.lang.String getServletInfo()</pre>
<div class="block">Returns information about the servlet, such as author, version, and
copyright.
<p>
The string that this method returns should be plain text and not markup
of any kind (such as HTML, XML, etc.).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>String</code> containing servlet information</dd>
</dl>
</li>
</ul>
<a name="destroy--">
<!-- -->
</a>
<ul class="blockListLast">
<li class="blockList">
<h4>destroy</h4>
<pre>void destroy()</pre>
<div class="block">Called by the servlet container to indicate to a servlet that the servlet
is being taken out of service. This method is only called once all
threads within the servlet's <code>service</code> method have exited or
after a timeout period has passed. After the servlet container calls this
method, it will not call the <code>service</code> method again on this
servlet.
<p>
This method gives the servlet an opportunity to clean up any resources
that are being held (for example, memory, file handles, threads) and make
sure that any persistent state is synchronized with the servlet's current
state in memory.</div>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
<!-- ========= END OF CLASS DATA ========= -->
<!-- ======= START OF BOTTOM NAVBAR ====== -->
<div class="bottomNav"><a name="navbar.bottom">
<!-- -->
</a>
<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div>
<a name="navbar.bottom.firstrow">
<!-- -->
</a>
<ul class="navList" title="Navigation">
<li><a href="../../overview-summary.html">Overview</a></li>
<li><a href="package-summary.html">Package</a></li>
<li class="navBarCell1Rev">Class</li>
<li><a href="package-tree.html">Tree</a></li>
<li><a href="../../deprecated-list.html">Deprecated</a></li>
<li><a href="../../index-all.html">Index</a></li>
<li><a href="../../help-doc.html">Help</a></li>
</ul>
</div>
<div class="subNav">
<ul class="navList">
<li><a href="../../javax/servlet/RequestDispatcher.html" title="interface in javax.servlet"><span class="typeNameLink">Prev Class</span></a></li>
<li><a href="../../javax/servlet/ServletConfig.html" title="interface in javax.servlet"><span class="typeNameLink">Next Class</span></a></li>
</ul>
<ul class="navList">
<li><a href="../../index.html?javax/servlet/Servlet.html" target="_top">Frames</a></li>
<li><a href="Servlet.html" target="_top">No Frames</a></li>
</ul>
<ul class="navList" id="allclasses_navbar_bottom">
<li><a href="../../allclasses-noframe.html">All Classes</a></li>
</ul>
<div>
<script type="text/javascript"><!--
allClassesLink = document.getElementById("allclasses_navbar_bottom");
if(window==top) {
allClassesLink.style.display = "block";
}
else {
allClassesLink.style.display = "none";
}
//-->
</script>
</div>
<div>
<ul class="subNavList">
<li>Summary: </li>
<li>Nested | </li>
<li>Field | </li>
<li>Constr | </li>
<li><a href="#method.summary">Method</a></li>
</ul>
<ul class="subNavList">
<li>Detail: </li>
<li>Field | </li>
<li>Constr | </li>
<li><a href="#method.detail">Method</a></li>
</ul>
</div>
<a name="skip.navbar.bottom">
<!-- -->
</a></div>
<!-- ======== END OF BOTTOM NAVBAR ======= -->
<p class="legalCopy"><small>Copyright © 2000-2015 The Apache Software Foundation. All Rights Reserved.</small></p>
</body>
</html>
|