What is getParameterMap?
getParameter(String name) Returns the value of a request parameter as a String , or null if the parameter does not exist. Map. getParameterMap() Returns a java.
Which methods are used to extract all name and value pairs from an HTTP request?
It has public Map getHeaderFields() method which you can use to get all the fields.
What is the return type of getParameterNames () method?
getParameterNames. Returns an Enumeration of String objects containing the names of the parameters contained in this request. If the request has no parameters, the method returns an empty Enumeration .
Which of the following methods are included in the ServletConfig interface?
Methods of ServletConfig interface public String getInitParameter(String name):Returns the parameter value for the specified parameter name. public Enumeration getInitParameterNames():Returns an enumeration of all the initialization parameter names. public String getServletName():Returns the name of the servlet.
How do you get the fully qualified name of the client that sent the request in Servlet?
String getRemoteHost() Returns the fully qualified name of the client that sent the request.
How is HttpServletRequest created?
In a typical Servlet container implementation if an HTTP request comes in, an HttpServletRequest is created right when the HTTP input data of the request is parsed by the Servlet container.
Which method is used to retrieve the values from HttpServletRequest?
The HttpServletRequest interface provides the getCookies method to obtain an array of cookies that are present in the request. This method returns null if no cookies were sent. The cookies are data sent from the client to the server on every request that the client makes.
What is the difference between servlets and applets?
A servlet is a Java programming language class used to extend the capabilities of a server. Applets are executed on client side. Servlets are executed on server side. Applets are used to provide interactive features to web applications that cannot be provided by HTML alone like capture mouse input etc.
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).
How many ServletConfig objects are created for a web application?
There is only one ServletContext object per web application.
How to get parameter map of post data in https?
HTTPServletRequest req, has a method getParameterMap () but, the values return a String [] instead of String, for post data as name=Marry&lastName=John&Age=20.
What is the use of GetParameter() method in ongetparametermap?
Previous methods [ getParameter (), getParameterNames () ] will be used if there is a chance of getting single value for particular parameter name, something for example check the output screen, there we can give only one value ( Sivateja) in Name field right? OngetParameterMap.java
How to get the parameter name of a request in Java?
If you are expecting pre determined parameters then you can use getParameter (java.lang.String name) method. Otherwise, approaches given above can be used, but with some differences, in HTTP-request someone can send one or more parameters with the same name.