What is a servlet request?
What is a servlet request?
A ServletRequest object provides data including parameter name and values, attributes, and an input stream. Interfaces that extend ServletRequest can provide additional protocol-specific data (for example, HTTP data is provided by HttpServletRequest .
How would you retrieve a parameter from the servlet request?
Reading Form Data using Servlet getParameter() − You call request. getParameter() method to get the value of a form parameter. getParameterValues() − Call this method if the parameter appears more than once and returns multiple values, for example checkbox.
Which method returns the name of the scheme used to make request?
javax.servlet Interface ServletRequest
| Method Summary | |
|---|---|
| String | getScheme() Returns the name of the scheme used to make this request, for example, http , https , or ftp . |
| String | getServerName() Returns the host name of the server to which the request was sent. |
Which methods of the servlet request object can access the request attributes?
We can set and get the value of attributes associated with the request by using the methods of ServletRequest object….Methods of ServletRequest to set, get and remove request attributes.
| Method | Description |
|---|---|
| void removeAttribute(String name) | This method sets the request attributes. |
Why do we use servlets?
A servlet is a Java programming language class that is used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers.
Is a servlet a server?
Review of Servlet Technology A servlet is a Java program that runs in a Web server, as opposed to an applet that runs in a client browser. Typically, the servlet takes an HTTP request from a browser, generates dynamic content (such as by querying a database), and provides an HTTP response back to the browser.
How do I get all request parameters?
Get all Request Parameters in Servlet
- Create a handleRequest method so you can use it both in doGet and doPost methods.
- Use HttpServletRequest. getParameterNames to get an Enumeration of parameter names.
- Use HttpServletRequest. getParameterValues(paramName) to get the parameters values.
What is the difference between HttpServletRequest and ServletRequest?
ServletRequest provides basic setter and getter methods for requesting a Servlet, but it doesn’t specify how to communicate. HttpServletRequest extends the Interface with getters for HTTP-communication (which is of course the most common way for communicating since Servlets mostly generate HTML).
What is request parameter in servlet?
Request parameters are extra information sent with the request. For HTTP servlets, parameters are contained in the query string or posted form data. You should only use this method when you are sure the parameter has only one value. If the parameter might have more than one value, use getParameterValues(java.
What is servlets explain any two methods of Request object?
This method is used to include the response of resource(for which the request passed servlet, JSP page, HTML file) in the current servlet response. The parameter request(HttpServletRequest type) and response(HttpServletResponse type) are the same objects as were passed to the calling servlet’s service method.
