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<li>Summary: </li>
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<div class="subTitle">javax.servlet.http</div>
<h2 title="Interface HttpServletRequest" class="title">Interface HttpServletRequest</h2>
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<dt>All Superinterfaces:</dt>
<dd><a href="../../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</a></dd>
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<dd><a href="../../../javax/servlet/http/HttpServletRequestWrapper.html" title="class in javax.servlet.http">HttpServletRequestWrapper</a></dd>
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<pre>public interface <span class="strong">HttpServletRequest</span>
extends <a href="../../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</a></pre>
<div class="block">Extends the <a href="../../../javax/servlet/ServletRequest.html" title="interface in javax.servlet"><code>ServletRequest</code></a> interface to provide request
information for HTTP servlets.
<p>
The servlet container creates an <code>HttpServletRequest</code> object and
passes it as an argument to the servlet's service methods
(<code>doGet</code>, <code>doPost</code>, etc).</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#BASIC_AUTH">BASIC_AUTH</a></strong></code>
<div class="block">String identifier for Basic authentication.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#CLIENT_CERT_AUTH">CLIENT_CERT_AUTH</a></strong></code>
<div class="block">String identifier for Client Certificate authentication.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#DIGEST_AUTH">DIGEST_AUTH</a></strong></code>
<div class="block">String identifier for Digest authentication.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#FORM_AUTH">FORM_AUTH</a></strong></code>
<div class="block">String identifier for Form authentication.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#authenticate(javax.servlet.http.HttpServletResponse)">authenticate</a></strong>(<a href="../../../javax/servlet/http/HttpServletResponse.html" title="interface in javax.servlet.http">HttpServletResponse</a> response)</code>
<div class="block">Triggers the same authentication process as would be triggered if the
request is for a resource that is protected by a security constraint.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getAuthType()">getAuthType</a></strong>()</code>
<div class="block">Returns the name of the authentication scheme used to protect the
servlet.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getContextPath()">getContextPath</a></strong>()</code>
<div class="block">Returns the portion of the request URI that indicates the context of the
request.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../javax/servlet/http/Cookie.html" title="class in javax.servlet.http">Cookie</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getCookies()">getCookies</a></strong>()</code>
<div class="block">Returns an array containing all of the <code>Cookie</code> objects the
client sent with this request.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getDateHeader(java.lang.String)">getDateHeader</a></strong>(java.lang.String name)</code>
<div class="block">Returns the value of the specified request header as a <code>long</code>
value that represents a <code>Date</code> object.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getHeader(java.lang.String)">getHeader</a></strong>(java.lang.String name)</code>
<div class="block">Returns the value of the specified request header as a
<code>String</code>.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.util.Enumeration<java.lang.String></code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getHeaderNames()">getHeaderNames</a></strong>()</code>
<div class="block">Returns an enumeration of all the header names this request contains.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Enumeration<java.lang.String></code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getHeaders(java.lang.String)">getHeaders</a></strong>(java.lang.String name)</code>
<div class="block">Returns all the values of the specified request header as an
<code>Enumeration</code> of <code>String</code> objects.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getIntHeader(java.lang.String)">getIntHeader</a></strong>(java.lang.String name)</code>
<div class="block">Returns the value of the specified request header as an <code>int</code>.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getMethod()">getMethod</a></strong>()</code>
<div class="block">Returns the name of the HTTP method with which this request was made, for
example, GET, POST, or PUT.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../javax/servlet/http/Part.html" title="interface in javax.servlet.http">Part</a></code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getPart(java.lang.String)">getPart</a></strong>(java.lang.String name)</code>
<div class="block">Gets the named Part or null if the Part does not exist.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.util.Collection<<a href="../../../javax/servlet/http/Part.html" title="interface in javax.servlet.http">Part</a>></code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getParts()">getParts</a></strong>()</code>
<div class="block">Return a collection of all uploaded Parts.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getPathInfo()">getPathInfo</a></strong>()</code>
<div class="block">Returns any extra path information associated with the URL the client
sent when it made this request.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getPathTranslated()">getPathTranslated</a></strong>()</code>
<div class="block">Returns any extra path information after the servlet name but before the
query string, and translates it to a real path.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getQueryString()">getQueryString</a></strong>()</code>
<div class="block">Returns the query string that is contained in the request URL after the
path.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getRemoteUser()">getRemoteUser</a></strong>()</code>
<div class="block">Returns the login of the user making this request, if the user has been
authenticated, or <code>null</code> if the user has not been
authenticated.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getRequestedSessionId()">getRequestedSessionId</a></strong>()</code>
<div class="block">Returns the session ID specified by the client.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getRequestURI()">getRequestURI</a></strong>()</code>
<div class="block">Returns the part of this request's URL from the protocol name up to the
query string in the first line of the HTTP request.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.lang.StringBuffer</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getRequestURL()">getRequestURL</a></strong>()</code>
<div class="block">Reconstructs the URL the client used to make the request.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getServletPath()">getServletPath</a></strong>()</code>
<div class="block">Returns the part of this request's URL that calls the servlet.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../javax/servlet/http/HttpSession.html" title="interface in javax.servlet.http">HttpSession</a></code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getSession()">getSession</a></strong>()</code>
<div class="block">Returns the current session associated with this request, or if the
request does not have a session, creates one.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../javax/servlet/http/HttpSession.html" title="interface in javax.servlet.http">HttpSession</a></code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getSession(boolean)">getSession</a></strong>(boolean create)</code>
<div class="block">Returns the current <code>HttpSession</code> associated with this request
or, if there is no current session and <code>create</code> is true,
returns a new session.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>java.security.Principal</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#getUserPrincipal()">getUserPrincipal</a></strong>()</code>
<div class="block">Returns a <code>java.security.Principal</code> object containing the name
of the current authenticated user.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdFromCookie()">isRequestedSessionIdFromCookie</a></strong>()</code>
<div class="block">Checks whether the requested session ID came in as a cookie.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdFromUrl()">isRequestedSessionIdFromUrl</a></strong>()</code>
<div class="block"><strong>Deprecated.</strong>
<div class="block"><i>As of Version 2.1 of the Java Servlet API, use
<a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdFromURL()"><code>isRequestedSessionIdFromURL()</code></a> instead.</i></div>
</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdFromURL()">isRequestedSessionIdFromURL</a></strong>()</code>
<div class="block">Checks whether the requested session ID came in as part of the request
URL.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdValid()">isRequestedSessionIdValid</a></strong>()</code>
<div class="block">Checks whether the requested session ID is still valid.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#isUserInRole(java.lang.String)">isUserInRole</a></strong>(java.lang.String role)</code>
<div class="block">Returns a boolean indicating whether the authenticated user is included
in the specified logical "role".</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#login(java.lang.String,%20java.lang.String)">login</a></strong>(java.lang.String username,
java.lang.String password)</code>
<div class="block">Authenticate the provided user name and password and then associated the
authenticated user with the request.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../javax/servlet/http/HttpServletRequest.html#logout()">logout</a></strong>()</code>
<div class="block">Removes any authenticated user from the request.</div>
</td>
</tr>
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</a>
<h3>Methods inherited from interface javax.servlet.<a href="../../../javax/servlet/ServletRequest.html" title="interface in javax.servlet">ServletRequest</a></h3>
<code><a href="../../../javax/servlet/ServletRequest.html#getAsyncContext()">getAsyncContext</a>, <a href="../../../javax/servlet/ServletRequest.html#getAttribute(java.lang.String)">getAttribute</a>, <a href="../../../javax/servlet/ServletRequest.html#getAttributeNames()">getAttributeNames</a>, <a href="../../../javax/servlet/ServletRequest.html#getCharacterEncoding()">getCharacterEncoding</a>, <a href="../../../javax/servlet/ServletRequest.html#getContentLength()">getContentLength</a>, <a href="../../../javax/servlet/ServletRequest.html#getContentType()">getContentType</a>, <a href="../../../javax/servlet/ServletRequest.html#getDispatcherType()">getDispatcherType</a>, <a href="../../../javax/servlet/ServletRequest.html#getInputStream()">getInputStream</a>, <a href="../../../javax/servlet/ServletRequest.html#getLocalAddr()">getLocalAddr</a>, <a href="../../../javax/servlet/ServletRequest.html#getLocale()">getLocale</a>, <a href="../../../javax/servlet/ServletRequest.html#getLocales()">getLocales</a>, <a href="../../../javax/servlet/ServletRequest.html#getLocalName()">getLocalName</a>, <a href="../../../javax/servlet/ServletRequest.html#getLocalPort()">getLocalPort</a>, <a href="../../../javax/servlet/ServletRequest.html#getParameter(java.lang.String)">getParameter</a>, <a href="../../../javax/servlet/ServletRequest.html#getParameterMap()">getParameterMap</a>, <a href="../../../javax/servlet/ServletRequest.html#getParameterNames()">getParameterNames</a>, <a href="../../../javax/servlet/ServletRequest.html#getParameterValues(java.lang.String)">getParameterValues</a>, <a href="../../../javax/servlet/ServletRequest.html#getProtocol()">getProtocol</a>, <a href="../../../javax/servlet/ServletRequest.html#getReader()">getReader</a>, <a href="../../../javax/servlet/ServletRequest.html#getRealPath(java.lang.String)">getRealPath</a>, <a href="../../../javax/servlet/ServletRequest.html#getRemoteAddr()">getRemoteAddr</a>, <a href="../../../javax/servlet/ServletRequest.html#getRemoteHost()">getRemoteHost</a>, <a href="../../../javax/servlet/ServletRequest.html#getRemotePort()">getRemotePort</a>, <a href="../../../javax/servlet/ServletRequest.html#getRequestDispatcher(java.lang.String)">getRequestDispatcher</a>, <a href="../../../javax/servlet/ServletRequest.html#getScheme()">getScheme</a>, <a href="../../../javax/servlet/ServletRequest.html#getServerName()">getServerName</a>, <a href="../../../javax/servlet/ServletRequest.html#getServerPort()">getServerPort</a>, <a href="../../../javax/servlet/ServletRequest.html#getServletContext()">getServletContext</a>, <a href="../../../javax/servlet/ServletRequest.html#isAsyncStarted()">isAsyncStarted</a>, <a href="../../../javax/servlet/ServletRequest.html#isAsyncSupported()">isAsyncSupported</a>, <a href="../../../javax/servlet/ServletRequest.html#isSecure()">isSecure</a>, <a href="../../../javax/servlet/ServletRequest.html#removeAttribute(java.lang.String)">removeAttribute</a>, <a href="../../../javax/servlet/ServletRequest.html#setAttribute(java.lang.String,%20java.lang.Object)">setAttribute</a>, <a href="../../../javax/servlet/ServletRequest.html#setCharacterEncoding(java.lang.String)">setCharacterEncoding</a>, <a href="../../../javax/servlet/ServletRequest.html#startAsync()">startAsync</a>, <a href="../../../javax/servlet/ServletRequest.html#startAsync(javax.servlet.ServletRequest,%20javax.servlet.ServletResponse)">startAsync</a></code></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
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<h3>Field Detail</h3>
<a name="BASIC_AUTH">
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<h4>BASIC_AUTH</h4>
<pre>static final java.lang.String BASIC_AUTH</pre>
<div class="block">String identifier for Basic authentication. Value "BASIC"</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#javax.servlet.http.HttpServletRequest.BASIC_AUTH">Constant Field Values</a></dd></dl>
</li>
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<a name="FORM_AUTH">
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<h4>FORM_AUTH</h4>
<pre>static final java.lang.String FORM_AUTH</pre>
<div class="block">String identifier for Form authentication. Value "FORM"</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#javax.servlet.http.HttpServletRequest.FORM_AUTH">Constant Field Values</a></dd></dl>
</li>
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<a name="CLIENT_CERT_AUTH">
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<h4>CLIENT_CERT_AUTH</h4>
<pre>static final java.lang.String CLIENT_CERT_AUTH</pre>
<div class="block">String identifier for Client Certificate authentication. Value
"CLIENT_CERT"</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#javax.servlet.http.HttpServletRequest.CLIENT_CERT_AUTH">Constant Field Values</a></dd></dl>
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<pre>static final java.lang.String DIGEST_AUTH</pre>
<div class="block">String identifier for Digest authentication. Value "DIGEST"</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../constant-values.html#javax.servlet.http.HttpServletRequest.DIGEST_AUTH">Constant Field Values</a></dd></dl>
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<h3>Method Detail</h3>
<a name="getAuthType()">
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<h4>getAuthType</h4>
<pre>java.lang.String getAuthType()</pre>
<div class="block">Returns the name of the authentication scheme used to protect the
servlet. All servlet containers support basic, form and client
certificate authentication, and may additionally support digest
authentication. If the servlet is not authenticated <code>null</code> is
returned.
<p>
Same as the value of the CGI variable AUTH_TYPE.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>one of the static members BASIC_AUTH, FORM_AUTH, CLIENT_CERT_AUTH,
DIGEST_AUTH (suitable for == comparison) or the
container-specific string indicating the authentication scheme,
or <code>null</code> if the request was not authenticated.</dd></dl>
</li>
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<a name="getCookies()">
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<h4>getCookies</h4>
<pre><a href="../../../javax/servlet/http/Cookie.html" title="class in javax.servlet.http">Cookie</a>[] getCookies()</pre>
<div class="block">Returns an array containing all of the <code>Cookie</code> objects the
client sent with this request. This method returns <code>null</code> if
no cookies were sent.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an array of all the <code>Cookies</code> included with this
request, or <code>null</code> if the request has no cookies</dd></dl>
</li>
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<a name="getDateHeader(java.lang.String)">
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<h4>getDateHeader</h4>
<pre>long getDateHeader(java.lang.String name)</pre>
<div class="block">Returns the value of the specified request header as a <code>long</code>
value that represents a <code>Date</code> object. Use this method with
headers that contain dates, such as <code>If-Modified-Since</code>.
<p>
The date is returned as the number of milliseconds since January 1, 1970
GMT. The header name is case insensitive.
<p>
If the request did not have a header of the specified name, this method
returns -1. If the header can't be converted to a date, the method throws
an <code>IllegalArgumentException</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - a <code>String</code> specifying the name of the header</dd>
<dt><span class="strong">Returns:</span></dt><dd>a <code>long</code> value representing the date specified in the
header expressed as the number of milliseconds since January 1,
1970 GMT, or -1 if the named header was not included with the
request</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - If the header value can't be converted to a date</dd></dl>
</li>
</ul>
<a name="getHeader(java.lang.String)">
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<h4>getHeader</h4>
<pre>java.lang.String getHeader(java.lang.String name)</pre>
<div class="block">Returns the value of the specified request header as a
<code>String</code>. If the request did not include a header of the
specified name, this method returns <code>null</code>. If there are
multiple headers with the same name, this method returns the first head
in the request. The header name is case insensitive. You can use this
method with any request header.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - a <code>String</code> specifying the header name</dd>
<dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the value of the requested
header, or <code>null</code> if the request does not have a
header of that name</dd></dl>
</li>
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<h4>getHeaders</h4>
<pre>java.util.Enumeration<java.lang.String> getHeaders(java.lang.String name)</pre>
<div class="block">Returns all the values of the specified request header as an
<code>Enumeration</code> of <code>String</code> objects.
<p>
Some headers, such as <code>Accept-Language</code> can be sent by clients
as several headers each with a different value rather than sending the
header as a comma separated list.
<p>
If the request did not include any headers of the specified name, this
method returns an empty <code>Enumeration</code>. The header name is case
insensitive. You can use this method with any request header.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - a <code>String</code> specifying the header name</dd>
<dt><span class="strong">Returns:</span></dt><dd>an <code>Enumeration</code> containing the values of the requested
header. If the request does not have any headers of that name
return an empty enumeration. If the container does not allow
access to header information, return null</dd></dl>
</li>
</ul>
<a name="getHeaderNames()">
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<pre>java.util.Enumeration<java.lang.String> getHeaderNames()</pre>
<div class="block">Returns an enumeration of all the header names this request contains. If
the request has no headers, this method returns an empty enumeration.
<p>
Some servlet containers do not allow servlets to access headers using
this method, in which case this method returns <code>null</code></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an enumeration of all the header names sent with this request; if
the request has no headers, an empty enumeration; if the servlet
container does not allow servlets to use this method,
<code>null</code></dd></dl>
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<pre>int getIntHeader(java.lang.String name)</pre>
<div class="block">Returns the value of the specified request header as an <code>int</code>.
If the request does not have a header of the specified name, this method
returns -1. If the header cannot be converted to an integer, this method
throws a <code>NumberFormatException</code>.
<p>
The header name is case insensitive.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - a <code>String</code> specifying the name of a request header</dd>
<dt><span class="strong">Returns:</span></dt><dd>an integer expressing the value of the request header or -1 if the
request doesn't have a header of this name</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.lang.NumberFormatException</code> - If the header value can't be converted to an
<code>int</code></dd></dl>
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<pre>java.lang.String getMethod()</pre>
<div class="block">Returns the name of the HTTP method with which this request was made, for
example, GET, POST, or PUT. Same as the value of the CGI variable
REQUEST_METHOD.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying the name of the method with
which this request was made</dd></dl>
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<pre>java.lang.String getPathInfo()</pre>
<div class="block">Returns any extra path information associated with the URL the client
sent when it made this request. The extra path information follows the
servlet path but precedes the query string and will start with a "/"
character.
<p>
This method returns <code>null</code> if there was no extra path
information.
<p>
Same as the value of the CGI variable PATH_INFO.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code>, decoded by the web container, specifying
extra path information that comes after the servlet path but
before the query string in the request URL; or <code>null</code>
if the URL does not have any extra path information</dd></dl>
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<pre>java.lang.String getPathTranslated()</pre>
<div class="block">Returns any extra path information after the servlet name but before the
query string, and translates it to a real path. Same as the value of the
CGI variable PATH_TRANSLATED.
<p>
If the URL does not have any extra path information, this method returns
<code>null</code> or the servlet container cannot translate the virtual
path to a real path for any reason (such as when the web application is
executed from an archive). The web container does not decode this string.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying the real path, or
<code>null</code> if the URL does not have any extra path
information</dd></dl>
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<pre>java.lang.String getContextPath()</pre>
<div class="block">Returns the portion of the request URI that indicates the context of the
request. The context path always comes first in a request URI. The path
starts with a "/" character but does not end with a "/" character. For
servlets in the default (root) context, this method returns "". The
container does not decode this string.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying the portion of the request URI
that indicates the context of the request</dd></dl>
</li>
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<a name="getQueryString()">
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<h4>getQueryString</h4>
<pre>java.lang.String getQueryString()</pre>
<div class="block">Returns the query string that is contained in the request URL after the
path. This method returns <code>null</code> if the URL does not have a
query string. Same as the value of the CGI variable QUERY_STRING.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the query string or
<code>null</code> if the URL contains no query string. The value
is not decoded by the container.</dd></dl>
</li>
</ul>
<a name="getRemoteUser()">
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<h4>getRemoteUser</h4>
<pre>java.lang.String getRemoteUser()</pre>
<div class="block">Returns the login of the user making this request, if the user has been
authenticated, or <code>null</code> if the user has not been
authenticated. Whether the user name is sent with each subsequent request
depends on the browser and type of authentication. Same as the value of
the CGI variable REMOTE_USER.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying the login of the user making
this request, or <code>null</code> if the user login is not known</dd></dl>
</li>
</ul>
<a name="isUserInRole(java.lang.String)">
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<h4>isUserInRole</h4>
<pre>boolean isUserInRole(java.lang.String role)</pre>
<div class="block">Returns a boolean indicating whether the authenticated user is included
in the specified logical "role". Roles and role membership can be defined
using deployment descriptors. If the user has not been authenticated, the
method returns <code>false</code>.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>role</code> - a <code>String</code> specifying the name of the role</dd>
<dt><span class="strong">Returns:</span></dt><dd>a <code>boolean</code> indicating whether the user making this
request belongs to a given role; <code>false</code> if the user
has not been authenticated</dd></dl>
</li>
</ul>
<a name="getUserPrincipal()">
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<h4>getUserPrincipal</h4>
<pre>java.security.Principal getUserPrincipal()</pre>
<div class="block">Returns a <code>java.security.Principal</code> object containing the name
of the current authenticated user. If the user has not been
authenticated, the method returns <code>null</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>java.security.Principal</code> containing the name of the
user making this request; <code>null</code> if the user has not
been authenticated</dd></dl>
</li>
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<a name="getRequestedSessionId()">
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<h4>getRequestedSessionId</h4>
<pre>java.lang.String getRequestedSessionId()</pre>
<div class="block">Returns the session ID specified by the client. This may not be the same
as the ID of the current valid session for this request. If the client
did not specify a session ID, this method returns <code>null</code>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> specifying the session ID, or
<code>null</code> if the request did not specify a session ID</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdValid()"><code>isRequestedSessionIdValid()</code></a></dd></dl>
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<a name="getRequestURI()">
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<pre>java.lang.String getRequestURI()</pre>
<div class="block">Returns the part of this request's URL from the protocol name up to the
query string in the first line of the HTTP request. The web container
does not decode this String. For example:
<table summary="Examples of Returned Values">
<tr align=left>
<th>First line of HTTP request</th>
<th>Returned Value</th>
<tr>
<td>POST /some/path.html HTTP/1.1
<td>
<td>/some/path.html
<tr>
<td>GET http://foo.bar/a.html HTTP/1.0
<td>
<td>/a.html
<tr>
<td>HEAD /xyz?a=b HTTP/1.1
<td>
<td>/xyz
</table>
<p>
To reconstruct an URL with a scheme and host, use
<a href="../../../javax/servlet/http/HttpServletRequest.html#getRequestURL()"><code>getRequestURL()</code></a>.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the part of the URL from the
protocol name up to the query string</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#getRequestURL()"><code>getRequestURL()</code></a></dd></dl>
</li>
</ul>
<a name="getRequestURL()">
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<h4>getRequestURL</h4>
<pre>java.lang.StringBuffer getRequestURL()</pre>
<div class="block">Reconstructs the URL the client used to make the request. The returned
URL contains a protocol, server name, port number, and server path, but
it does not include query string parameters.
<p>
Because this method returns a <code>StringBuffer</code>, not a string,
you can modify the URL easily, for example, to append query parameters.
<p>
This method is useful for creating redirect messages and for reporting
errors.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>StringBuffer</code> object containing the reconstructed
URL</dd></dl>
</li>
</ul>
<a name="getServletPath()">
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<h4>getServletPath</h4>
<pre>java.lang.String getServletPath()</pre>
<div class="block">Returns the part of this request's URL that calls the servlet. This path
starts with a "/" character and includes either the servlet name or a
path to the servlet, but does not include any extra path information or a
query string. Same as the value of the CGI variable SCRIPT_NAME.
<p>
This method will return an empty string ("") if the servlet used to
process this request was matched using the "/*" pattern.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a <code>String</code> containing the name or path of the servlet
being called, as specified in the request URL, decoded, or an
empty string if the servlet used to process the request is
matched using the "/*" pattern.</dd></dl>
</li>
</ul>
<a name="getSession(boolean)">
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<h4>getSession</h4>
<pre><a href="../../../javax/servlet/http/HttpSession.html" title="interface in javax.servlet.http">HttpSession</a> getSession(boolean create)</pre>
<div class="block">Returns the current <code>HttpSession</code> associated with this request
or, if there is no current session and <code>create</code> is true,
returns a new session.
<p>
If <code>create</code> is <code>false</code> and the request has no valid
<code>HttpSession</code>, this method returns <code>null</code>.
<p>
To make sure the session is properly maintained, you must call this
method before the response is committed. If the container is using
cookies to maintain session integrity and is asked to create a new
session when the response is committed, an IllegalStateException is
thrown.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>create</code> - <code>true</code> to create a new session for this request if
necessary; <code>false</code> to return <code>null</code> if
there's no current session</dd>
<dt><span class="strong">Returns:</span></dt><dd>the <code>HttpSession</code> associated with this request or
<code>null</code> if <code>create</code> is <code>false</code>
and the request has no valid session</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#getSession()"><code>getSession()</code></a></dd></dl>
</li>
</ul>
<a name="getSession()">
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<h4>getSession</h4>
<pre><a href="../../../javax/servlet/http/HttpSession.html" title="interface in javax.servlet.http">HttpSession</a> getSession()</pre>
<div class="block">Returns the current session associated with this request, or if the
request does not have a session, creates one.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>the <code>HttpSession</code> associated with this request</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#getSession(boolean)"><code>getSession(boolean)</code></a></dd></dl>
</li>
</ul>
<a name="isRequestedSessionIdValid()">
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<h4>isRequestedSessionIdValid</h4>
<pre>boolean isRequestedSessionIdValid()</pre>
<div class="block">Checks whether the requested session ID is still valid.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if this request has an id for a valid session
in the current session context; <code>false</code> otherwise</dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#getRequestedSessionId()"><code>getRequestedSessionId()</code></a>,
<a href="../../../javax/servlet/http/HttpServletRequest.html#getSession(boolean)"><code>getSession(boolean)</code></a></dd></dl>
</li>
</ul>
<a name="isRequestedSessionIdFromCookie()">
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<h4>isRequestedSessionIdFromCookie</h4>
<pre>boolean isRequestedSessionIdFromCookie()</pre>
<div class="block">Checks whether the requested session ID came in as a cookie.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the session ID came in as a cookie;
otherwise, <code>false</code></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#getSession(boolean)"><code>getSession(boolean)</code></a></dd></dl>
</li>
</ul>
<a name="isRequestedSessionIdFromURL()">
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<h4>isRequestedSessionIdFromURL</h4>
<pre>boolean isRequestedSessionIdFromURL()</pre>
<div class="block">Checks whether the requested session ID came in as part of the request
URL.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the session ID came in as part of a URL;
otherwise, <code>false</code></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../javax/servlet/http/HttpServletRequest.html#getSession(boolean)"><code>getSession(boolean)</code></a></dd></dl>
</li>
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<h4>isRequestedSessionIdFromUrl</h4>
<pre>boolean isRequestedSessionIdFromUrl()</pre>
<div class="block"><span class="strong">Deprecated.</span> <i>As of Version 2.1 of the Java Servlet API, use
<a href="../../../javax/servlet/http/HttpServletRequest.html#isRequestedSessionIdFromURL()"><code>isRequestedSessionIdFromURL()</code></a> instead.</i></div>
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<a name="authenticate(javax.servlet.http.HttpServletResponse)">
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<h4>authenticate</h4>
<pre>boolean authenticate(<a href="../../../javax/servlet/http/HttpServletResponse.html" title="interface in javax.servlet.http">HttpServletResponse</a> response)
throws java.io.IOException,
<a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></pre>
<div class="block">Triggers the same authentication process as would be triggered if the
request is for a resource that is protected by a security constraint.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>response</code> - The response to use to return any authentication
challenge</dd>
<dt><span class="strong">Returns:</span></dt><dd><code>true</code> if the user is successfully authenticated and
<code>false</code> if not</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd>
<dd><code><a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code></dd><dt><span class="strong">Since:</span></dt>
<dd>Servlet 3.0</dd></dl>
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<a name="login(java.lang.String, java.lang.String)">
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<h4>login</h4>
<pre>void login(java.lang.String username,
java.lang.String password)
throws <a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></pre>
<div class="block">Authenticate the provided user name and password and then associated the
authenticated user with the request.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>username</code> - The user name to authenticate</dd><dd><code>password</code> - The password to use to authenticate the user</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code> - If any of <a href="../../../javax/servlet/http/HttpServletRequest.html#getRemoteUser()"><code>getRemoteUser()</code></a>,
<a href="../../../javax/servlet/http/HttpServletRequest.html#getUserPrincipal()"><code>getUserPrincipal()</code></a> or <a href="../../../javax/servlet/http/HttpServletRequest.html#getAuthType()"><code>getAuthType()</code></a> are
non-null, if the configured authenticator does not support
user name and password authentication or if the
authentication fails</dd><dt><span class="strong">Since:</span></dt>
<dd>Servlet 3.0</dd></dl>
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<h4>logout</h4>
<pre>void logout()
throws <a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></pre>
<div class="block">Removes any authenticated user from the request.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code> - If the logout fails</dd><dt><span class="strong">Since:</span></dt>
<dd>Servlet 3.0</dd></dl>
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<h4>getParts</h4>
<pre>java.util.Collection<<a href="../../../javax/servlet/http/Part.html" title="interface in javax.servlet.http">Part</a>> getParts()
throws java.io.IOException,
java.lang.IllegalStateException,
<a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></pre>
<div class="block">Return a collection of all uploaded Parts.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>A collection of all uploaded Parts.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if an I/O error occurs</dd>
<dd><code>java.lang.IllegalStateException</code> - if size limits are exceeded</dd>
<dd><code><a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code> - if the request is not multipart/form-data</dd><dt><span class="strong">Since:</span></dt>
<dd>Servlet 3.0</dd></dl>
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<h4>getPart</h4>
<pre><a href="../../../javax/servlet/http/Part.html" title="interface in javax.servlet.http">Part</a> getPart(java.lang.String name)
throws java.io.IOException,
java.lang.IllegalStateException,
<a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></pre>
<div class="block">Gets the named Part or null if the Part does not exist. Triggers upload
of all Parts.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - </dd>
<dt><span class="strong">Returns:</span></dt><dd>The named Part or null if the Part does not exist</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if an I/O error occurs</dd>
<dd><code>java.lang.IllegalStateException</code> - if size limits are exceeded</dd>
<dd><code><a href="../../../javax/servlet/ServletException.html" title="class in javax.servlet">ServletException</a></code> - if the request is not multipart/form-data</dd><dt><span class="strong">Since:</span></dt>
<dd>Servlet 3.0</dd></dl>
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