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Java Articles
Page 416 of 450
What are JSP declarations? In how many ways we can write JSP declarations?
A declaration declares one or more variables or methods that you can use in Java code later in the JSP file. You must declare the variable or method before you use it in the JSP file.Following is the syntax for JSP Declarations −You can write the XML equivalent of the above syntax as follows − code fragment Following is an example for JSP Declarations −
Read MoreHow to declare an object of a class using JSP declarations?
A declaration declares one or more variables or methods that you can use in Java code later in the JSP file. You must declare the variable or method before you use it in the JSP file.Following is the syntax for JSP Declarations −You can write the XML equivalent of the above syntax as follows − code fragment Following is an example of Object declaration in JSP Declarations −
Read MoreHow to write a JDBC program to extract data from multiple databases?
To connect with a data base, you need toRegister the DriverSelect the required database register the Driver class of the particular database using the registerDriver() method of the DriverManager class or, the forName() method of the class named Class.DriverManager.registerDriver(new com.mysql.jdbc.Driver());Get connectionCreate a connection object by passing the URL of the database, username and password of a user in the database (in string format) as parameters to the getConnection() method of the DriverManager class.Connection mysqlCon = DriverManager.getConnection(mysqlUrl, "root", "password");And, to extract data you need to execute the select query as:ResultSet rs = stmt.executeQuery("Select * from Employee");To print the contents of the ...
Read MoreWhat are JSP comments?
JSP comment marks text or statements that the JSP container should ignore. A JSP comment is useful when you want to hide or "comment out", a part of your JSP page.Following is the syntax of the JSP comments −Following example shows the JSP Comments − A Comment Test A Test of Comments The above code will generate the following result −A Test of Comments
Read MoreHow to use action in JSP?
The getProperty action is used to retrieve the value of a given property and converts it to a string, and finally inserts it into the output.The getProperty action has only two attributes, both of which are required. The syntax of the getProperty action is as follows − ... Following table lists out the required attributes associated with the getProperty action −Sr.No.Attribute & Description1nameThe name of the Bean that has a property to be retrieved. The Bean must have been previously defined.2propertyThe property attribute is the name of the Bean property to be retrieved.ExampleLet us define a test bean that will ...
Read MoreHow many types of directive tags JSP supports?
A JSP directive affects the overall structure of the servlet class. It usually has the following form −Directives can have a number of attributes which you can list down as key-value pairs and separated by commas.The blanks between the @ symbol and the directive name, and between the last attribute and the closing %>, are optional.There are three types of directive tag −S.No.Directive & Description1Defines page-dependent attributes, such as scripting language, error page, and buffering requirements.2Includes a file during the translation phase.3Declares a tag library, containing custom actions, used in the page
Read MoreI need to understand how to use a bean and update its properties in JSP page. Please share an example.
The useBean action is quite versatile. It first searches for an existing object utilizing the id and scope variables. If an object is not found, it then tries to create the specified object.The simplest way to load a bean is as follows −Once a bean class is loaded, you can use jsp:setProperty and jsp:getProperty actions to modify and retrieve the bean properties.Following table lists out the attributes associated with the useBean action −S.No.Attribute & Description1classDesignates the full package name of the bean.2typeSpecifies the type of the variable that will refer to the object.3beanNameGives the name of the bean as specified ...
Read MoreWhat is the use of jsp text action element?
The action can be used to write the template text in JSP pages and documents. Following is the simple syntax for this action −Template dataThe body of the template cannot contain other elements; it can only contain text and EL expressions (Note − EL expressions are explained in a subsequent chapter). Note that in XML files, you cannot use expressions such as ${whatever > 0}, because the greater than signs are illegal. Instead, use the gt form, such as ${whatever gt 0} or an alternative is to embed the value in a CDATA section.]]>If you need to include a ...
Read MoreHow to write a for loop in a JSP page?
Following is the for loop example − FOR LOOP Example JSP Tutorial The above code will generate the following result −JSP Tutorial JSP Tutorial JSP Tutorial
Read MoreWhat is the use of Cookie or hidden fields in JSP?
CookiesA webserver can assign a unique session ID as a cookie to each web client and for subsequent requests from the client they can be recognized using the received cookie.This may not be an effective way as the browser at times does not support a cookie. It is not recommended to use this procedure to maintain the sessions.Hidden Form FieldsA web server can send a hidden HTML form field along with a unique session ID as follows −This entry means that, when the form is submitted, the specified name and value are automatically included in the GET or the POST ...
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