What are the ways for servlet collaboration?
– The collaboration can be done by redirecting a servlet from another or loading the servlets from the ServletContext access methods. – This can also be achieved by the methods forward() and include() of RequestDispatcher or by sendRedirect() method. Servlets are java classes which run on a web server.
What are the two ways used for servlet collaboration?
It provides the following two methods: public void forward(ServletRequest request, ServletResponse response)throws ServletException, java. io.
How many types of servlets are there?
Execution of Servlets involves six basic steps: The clients send the request to the webserver. The web server receives the request….Servlets API’s:
| Component | Type | Package |
|---|---|---|
| ServletResponse | Interface | javax.servlet.* |
| GenericServlet | Class | javax.servlet.* |
| HttpServlet | Class | javax.servlet.http.* |
What is request dispatcher in Servlet?
Interface RequestDispatcher Defines an object that receives requests from the client and sends them to any resource (such as a servlet, HTML file, or JSP file) on the server. This interface is intended to wrap servlets, but a servlet container can create RequestDispatcher objects to wrap any type of resource.
How do you call one servlet from another?
You can call this servlet programmatically from another servlet in one of two ways. To include another servlet’s output, use the include() method from the RequestDispatcher interface. This method calls a servlet by its URI and waits for it to return before continuing to process the interaction.
What are two main types of servlets?
There are two main servlet types, generic and HTTP:
- Generic servlets. Extend javax. servlet. GenericServlet. Are protocol independent.
- HTTP servlets. Extend javax. servlet. HttpServlet. Have built-in HTTP protocol support and are more useful in a Sun Java System Web Server environment.
What is type of servlet?
There is a possibility of developing ‘n’ types of servlets, like httpservlet, ftpservlet, smtpservlet etc. for all these protocol specific servlet classes GenericServlet is the common super class containing common properties and logics. So, GenericServlet is not a separate type of servlet.
What are the two methods of request dispatcher?
The RequestDispatcher interface provides two methods. They are: public void forward(ServletRequest request,ServletResponse response)throws ServletException,java. io.
What are the servlet methods?
Methods of Servlet interface
| Method | Description |
|---|---|
| public void destroy() | is invoked only once and indicates that servlet is being destroyed. |
| public ServletConfig getServletConfig() | returns the object of ServletConfig. |
| public String getServletInfo() | returns information about servlet such as writer, copyright, version etc. |
Can we call servlet from JSP?
Invoking a JSP Page from a Servlet. You can invoke a JSP page from a servlet through functionality of the standard javax. servlet. RequestDispatcher interface.
Are there any’n’types of servlets?
There is a possibility of developing ‘n’ types of servlets, like httpservlet, ftpservlet, smtpservlet etc. for all these protocol specific servlet classes GenericServlet is the common super class containing common properties and logics. So, GenericServlet is not a separate type of servlet.
How to achieve servlet collaboration in JavaScript?
To achieve servlet collaboration, it uses the following method: This method is used redirect response to another resource, which may be a servlet, jsp or an html file. The argument accepted by it, is a URL which can be both, absolute and relative. It works on the client side and uses the browser’s URL bar to make a request.
How to use servlet to display an image?
Example to display image using Servlet. In this example, we are using FileInputStream class to read image and ServletOutputStream class for writing this image content as a response. To make the performance faster, we have used BufferedInputStream and BufferedOutputStream class. You need to use the content type image/jpeg. In this example,…
How are servlets used in a web application?
The full functionality of the Java class libraries is available to a servlet. It can communicate with applets, databases, or other software via the sockets and RMI mechanisms that you have seen already. The following diagram shows the position of Servlets in a Web Application.