How To Use Input Type File In Jsf Program
PurposeThis tutorial covers how to use the file upload componentintroduced in JavaServer Faces 2.2 (JSF 2.2). It alsodemonstrates validation with the file upload component.Time to CompleteApproximately 45 minutesIntroductionThe JSF 2.2 specification features a file upload component, h:inputFile,which is based on Java Servlet 3.0 multipart support. The fileupload component can have converters and validators. In this section, you create a Java EE 7 web application in theNetBeans IDE. Select File New Project.In the New Project dialog box, perform the following steps:a. Select Java Web from Categories.b. Select Web Application from Projects.c.
Click Next.In the Name and Location dialog box, enter FileUploadas the file name and click Next.In the Server and Settings dialog box, perform thefollowing steps:a. Select GlassFish Server 4.0 from theServer list.b.
Select Java EE 7 Web from theJava EE Version list.c. Click Next.Inthe Frameworks dialog box, select JavaServerFaces and click Finish.A Java 7 web application project is created. Developing a JSF page. In this section, you deploy and run the project.Modify web.xml to set thewelcome file of the project to FileUpload.xhtmlinstead of index.html.a.
How To Use Input Type File In Jsf Programs
Expand the FileUpload project in theProjects window.b. Expand Configuration Files and double-click web.xmlto open it in the editor.c. Update the value of the element to faces/FileUpload.xhtm l.In the Projects window, right-click FileUpload andselect Deploy.In the Projects window, right-click FileUpload andselect Run.The application appears in the browser.Perform the following steps:a.
Click Browse.b. Browse to the location where you saved the two sample inputfiles specified in the Prerequisites section.c. Select the inputFileSuccess.txt file.d.
Click Upload.The contents of the inputFileSuccess.txt fileare displayed.Perform the following actions:a. Run the FileUpload project. Theapplication appears in the browser.b. Click Browse.c. Browse to the location where you saved the two sample inputfiles specified in the Prerequisite section.d. Select the inputFileFailure.txt file.e.
Click Upload.The contents of the inputFileFilure.txt fileare displayed because validation was not added to the filecomponent.Developing a Validator Class. In this section, you verify the file upload component with thevalidator attached. You do that by deploying and running theproject and testing it with the two sample input files.To test with the inputFileSuccess.txt file,perform the following steps:a. Run the FileUpload project.
Theapplication appears in the browser.b. Click Browse.c.
Browse to the location where you saved the two sample inputfiles specified in the Prerequisites section.d. Select the inputFileSuccess.txtfile.e. Click Upload.Because the inputFileSuccess.txt containsthe JSR-344 string, the contents of the fileare displayed.To test with the inputFileFailure.txtfile, perform the following steps:a. Run the FileUpload project. Theapplication appears in the browser.b. Click Browse.c.
Browse to the location where you saved the two sample inputfiles specified in the Prerequisites section.d. Select the inputFileFailure.txt file.e. Click Upload.Because the inputFileFailure.txt file doesnot contain the JSR-344 string, a validationerror is displayed.Summary. To help navigate this Oracle by Example, note the following: Hiding Header Buttons: Click the Title to hide the buttons in the header. To show thebuttons again, simply click the Title again. Topic List Button: A list of all the topics. Click one of the topics to navigate tothat section.
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How To Use Input Type File In Jsf Programming
How to retrieve values from HTML form input elements in JSP?In theory, GET is for getting data from the server and POST is for sending data there. However, GET appends the form data (called a query string) to an URL, in the form of key/value pairs from the HTML form, for example, name=John. In the query string, key/value pairs are separated by & characters, spaces are converted to + characters, and special characters are converted to their hexadecimal equivalents. Because the query string is in the URL, the page can be bookmarked or sent as email with its query string. The query string is usually limited to a relatively small number of characters.The POST method, however, passes data of unlimited length as an HTTP request body to the server. The user working in the client Web browser cannot see the data that is being sent, so POST requests are ideal for sending confidential data (such as a credit card number) or large amounts of data to the server.The request is a pre-defined variable and available to all JSP pages. The request is a type of HttpServletRequest object.
The data the user enters on the HTML form is stored in this request object. To retrieve any value from an HTML form input element on a JSP page, you need to use the request object's getParameter(String s) method. The String argument of the method getParameter(String s) is the elements name whose value you want to retrieve. The JSP pre-defined request variable is used to obtain information from the request as sent by the browser. The parameters, include from URL quert string and posted form data, are stored by the servlet container as a set of name-value pairs.The result of getParameter(String s) method will differ according to what type of element you are querying. For instance a checkbox element might return 'on' if it has been selected, or it might return null if it hasn't been selected.
Where a text element will return the text/value that was part of the element at the time the form was submitted. A radio button will return the value of the selected radio button in the button group. If you try and query an element that never existed in the form, the request.getParameter(String s) will return null.Example HTML Form: