public class JspServlet
extends javax.servlet.GenericServlet
implements javax.servlet.Servlet, javax.servlet.jsp.HttpJspPage
Constructor and Description |
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JspServlet()
Public default constructor; required by spec.
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Modifier and Type | Method and Description |
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void |
_jspInit()
This method is also invoked when the JspPage is initialized.
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void |
_jspService(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)
This method corresponds to the body of the JSP page.
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void |
destroy()
Called by the servlet container to indicate to a servlet that the servlet is being taken out of service.
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protected String |
getDescription()
Returns a string representation of this object's attributes.
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javax.servlet.ServletConfig |
getServletConfig()
Returns a
ServletConfig object, which contains initialization and startup parameters for this servlet. |
javax.servlet.ServletContext |
getServletContext()
Returns a reference to the ServletContext in which this Servlet is running.
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String |
getServletInfo()
Returns information about the servlet, such as author, version, and copyright.
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protected SessionHelper |
getSessionHelper()
Get the SessionHelper.
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void |
init(javax.servlet.ServletConfig cfg)
Called by the servlet container to indicate to a servlet that the servlet is being placed into service.
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void |
jspDestroy()
This method is invoked when the JspPage is about to be destroyed.
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void |
jspInit()
This method is invoked when the JspPage is initialized.
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void |
service(javax.servlet.ServletRequest req, javax.servlet.ServletResponse res)
Called by the servlet container to allow the servlet to respond to a request.
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String |
toString()
Returns a string representation of the object.
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public final void init(javax.servlet.ServletConfig cfg) throws javax.servlet.ServletException
The servlet container calls the init
method exactly once after instantiating the servlet. The init
method must complete successfully before the servlet can receive any requests.
The servlet container cannot place the servlet into service if the init
method
ServletException
init
in interface javax.servlet.Servlet
init
in class javax.servlet.GenericServlet
cfg
- a ServletConfig
object containing the servlet's configuration and initialization parametersjavax.servlet.ServletException
- if an exception has occurred that interferes with the servlet's normal operationpublic final javax.servlet.ServletConfig getServletConfig()
ServletConfig
object, which contains initialization and startup parameters for this servlet. The ServletConfig
object returned is the one passed to the init
method.
Implementations of this interface are responsible for storing the ServletConfig
object so that this method can return it.
getServletConfig
in interface javax.servlet.Servlet
getServletConfig
in class javax.servlet.GenericServlet
ServletConfig
object that initializes this servletinit(javax.servlet.ServletConfig)
public final void service(javax.servlet.ServletRequest req, javax.servlet.ServletResponse res) throws javax.servlet.ServletException, IOException
This method is only called after the servlet's init()
method has completed successfully.
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 the Java tutorial on multi-threaded programming.
service
in interface javax.servlet.Servlet
service
in class javax.servlet.GenericServlet
req
- the ServletRequest
object that contains the client's requestres
- the ServletResponse
object that contains the servlet's responsejavax.servlet.ServletException
- if an exception occurs that interferes with the servlet's normal operationIOException
- if an input or output exception occurspublic String getServletInfo()
The string that this method returns should be plain text and not markup of any kind (such as HTML, XML, etc.).
getServletInfo
in interface javax.servlet.Servlet
getServletInfo
in class javax.servlet.GenericServlet
String
containing servlet informationpublic final void destroy()
service
method have exited or after a timeout period has passed. After the servlet container calls this method, it will not call the service
method again on this servlet.
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.
destroy
in interface javax.servlet.Servlet
destroy
in class javax.servlet.GenericServlet
public void jspInit()
getServletConfig()
will return the desired value.jspInit
in interface javax.servlet.jsp.JspPage
public void _jspInit()
getServletConfig()
will return the desired value. JBoss TagLibs will not be properly initialized if this method is not executed.public void jspDestroy()
jspDestroy
in interface javax.servlet.jsp.JspPage
public void _jspService(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res) throws javax.servlet.ServletException, IOException
_jspService
in interface javax.servlet.jsp.HttpJspPage
req
- the HttpServletRequest
object that contains the client's requestres
- the HttpServletResponse
object that contains the JSP's responsejavax.servlet.ServletException
IOException
public String toString()
protected String getDescription()
protected SessionHelper getSessionHelper()
public javax.servlet.ServletContext getServletContext()
getServletContext
in interface javax.servlet.ServletConfig
getServletContext
in class javax.servlet.GenericServlet