Objects of implicits

Objects of  implicits:

The objects are formed by web container and available in JSP Pages.

Objects in Implicits

JSP out implicit object :

PrintWriter out=response.getWriter();

JSP request implicit object

The JSP ask for is a verifiable protest of sort HttpServletRequest i.e. made for each jsp ask for by the web compartment. It can be utilized to get ask for data, for example, parameter, header data, remote address, server name, server port, content sort, character encoding and so on. It can likewise be utilized to set, get and expel traits from the jsp ask for scope.

Example:

index.html

<form action=”welcome.jsp”>

<input type=”text” name=”uname”>

<input type=”submit” value=”go”><br/>

</form>

welcome.jsp

<%

String name=request.getParameter(“uname”);

out.print(“welcome “+name);

%>

 JSP response implicit object:

In JSP, reaction is an understood question of sort HttpServletResponse. The occurrence of HttpServletResponse is made by the web compartment for each jsp ask.

It can be utilized to include or control reaction, for example, divert reaction to another asset, send blunder and so on.

Example:

 index.html

<form action=”welcome.jsp”>

<input type=”text” name=”uname”>

<input type=”submit” value=”go”><br/>

</form>

welcome.jsp

<%

response.sendRedirect(“http://www.google.com”);

%>

 JSP config implicit object :

In JSP, config is a verifiable protest of sort ServletConfig. This protest can be utilized to get instatement parameter for a specific JSP page. The config protest is made by the web holder for each jsp page. By and large, it is utilized to get instatement parameter from the web.xml record.

Example:

index.html:

<form action=”welcome”>

<input type=”text” name=”uname”>

<input type=”submit” value=”go”><br/>

</form>

 web.xml file:

<web-app>

<servlet>

<servlet-name>sonoojaiswal</servlet-name>

<jsp-file>/welcome.jsp</jsp-file>

<init-param>

<param-name>dname</param-name>

<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>sonoojaiswal</servlet-name>

<url-pattern>/welcome</url-pattern>

</servlet-mapping>

</web-app>

welcome.jsp:

<%

out.print(“Welcome “+request.getParameter(“uname”));

String driver=config.getInitParameter(“dname”);

out.print(“driver name is=”+driver);

%>

 JSP application:

In JSP, application is an understood question of sort ServletContext. The occurrence of ServletContext is made just once by the web holder when application or venture is sent on the server.

This protest can be utilized to get instatement parameter from configuaration record (web.xml). It can likewise be utilized to get, set or expel trait from the application scope. This instatement parameter can be utilized by all jsp pages.

index.html :

<form action=”welcome”>

<input type=”text” name=”uname”>

<input type=”submit” value=”go”><br/>

</form>

 

web.xml file :

<web-app>

<servlet>

<servlet-name>sonoojaiswal</servlet-name>

<jsp-file>/welcome.jsp</jsp-file>

</servlet>

<servlet-mapping>

<servlet-name>sonoojaiswal</servlet-name>

<url-pattern>/welcome</url-pattern>

</servlet-mapping>

<context-param>

<param-name>dname</param-name>

<param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>

</context-param>

</web-app>

welcome.jsp:

<%

out.print(“Welcome “+request.getParameter(“uname”));

 

String driver=application.getInitParameter(“dname”);

out.print(“driver name is=”+driver);

%>

session implicit object :

The implicit object is a type of HttpSession,the set,get and session implicit object used by the developer.

 PageContext :
  • page
  • request
  • session
  • application

exception:

In JSP, special case is an understood protest of sort java.lang.Throwable class. This protest can be utilized to print the special case. Yet, it must be utilized as a part of blunder pages.It is ideal to learn it after page order.

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