What is difference between getAttribute and getParameter?

getParameter() returns http request parameters. Those passed from the client to the server. getAttribute() is for server-side usage only – you fill the request with attributes that you can use within the same request. For example – you set an attribute in a servlet, and read it from a JSP.

What is getParameter in JSP?

getParameter() – Passing data from client to JSP The request. getParameter() is being used here to retrieve form data from client side. jsp page gets called, it being mentioned in the action tag. 3) This JSP page fetches the data using getParameter() method and displays the same to the user.

What is the return type of request getAttribute () method?

getAttribute. Returns the value of the named attribute as an Object , or null if no attribute of the given name exists. The servlet container may set attributes to make available custom information about a request. For example, for requests made using HTTPS, the attribute javax.

What is the difference between parameters and attributes?

Attribute vs Parameter An attribute is a variable of any type that is declared directly in a class. A parameter is a variable defined by the function that receives a value when it is called. An attribute is used with classes and objects. A parameter is used with a function or a method.

How can I get getAttribute in JSP?

getAttribute() – Passing data from Server to JSP

1. First create data at the server side and pass it to a JSP.
2. Next, the JSP will retrieve the sent data using getAttribute().
3. Finally, the JSP will display the data retrieved, in a tabular form.

What is the difference between @RequestParam and @ModelAttribute?

@RequestParam is best for reading a small number of params. @ModelAttribute is used when you have a form with a large number of fields. @ModelAttribute gives you additional features such as data binding, validation and form prepopulation.

What is the difference between JSP and servlets?

Servlets are faster as compared to JSP, as they have a short response time. JSP is slower than Servlets, as the first step in the JSP lifecycle is the conversion of JSP to Java code and then the compilation of the code. JSP are HTML-based codes. Servlets are harder to code, as here, the HTML codes are written in Java.

How are servlet parameters read?

The ServletRequest interface includes methods that allow you to read the names and values of parameters that are included in a client request. The ServletRequest interface includes methods that allow you to read the names and values of parameters that are included in a client request.

How do I get PageContext?

A PageContext instance is obtained by a JSP implementation class by calling the JspFactory. getPageContext() method, and is released by calling JspFactory. releasePageContext(). An example of how PageContext, JspFactory, and other classes can be used within a JSP Page Implementation object is given elsewhere.