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For example, name, age, or identification number, etc. When the next time the browser sends any request to the web server then it sends those cookies information to the server and server uses that information to identify the user or may be for some other purpose as well. This chapter will teach you how to set or reset cookies, how to access them and how to delete them using JSP programs.

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The name and value will be URL encoded. The expires field is an instruction to the browser to "forget" the cookie after the given time and date. If the browser is configured to store cookies, it will then keep this information until the expiry date. If the user points the browser at any page that matches the path and domain of the cookie, it will resend the cookie to the server. A JSP script will then have access to the cookies through the request method request.

This method sets how much time in seconds should elapse before the cookie expires. If you don't set this, the cookie will last only for the current session. This method returns the maximum age of the cookie, specified in seconds, By default, -1 indicating the cookie will persist until the browser shutdown. This method sets the path to which this cookie applies. If you don't specify a path, the cookie is returned for all URLs in the same directory as the current page as well as all subdirectories. This method sets the boolean value indicating whether the cookie should only be sent over encrypted i.

This method specifies a comment that describes a cookie's purpose. The comment is useful if the browser presents the cookie to the user.

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This method returns the comment describing the purpose of this cookie, or null if the cookie has no comment. You call the Cookie constructor with a cookie name and a cookie value, both of which are strings. You use setMaxAge to specify how long in seconds the cookie should be valid. The following code will set up a cookie for 24 hours. Let us modify our Form Example to set the cookies for the first and the last name.


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Keep the above HTML content in a file hello. Try to enter the First Name and the Last Name and then click the submit button. This will display the first name and the last name on your screen and will also set two cookies firstName and lastName.


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These cookies will be passed back to the server when the next time you click the Submit button. In the next section, we will explain how you can access these cookies back in your web application. To read cookies, you need to create an array of javax. Cookie objects by calling the getCookies method of HttpServletRequest. Then cycle through the array, and use getName and getValue methods to access each cookie and associated value. Let us now put the above code in main. To delete cookies is very simple. Let us now put the above code in the main. You can delete your cookies in the Internet Explorer manually.

Start at the Tools menu and select the Internet Options. To delete all cookies, click the Delete Cookies button. In this chapter, we will discuss session tracking in JSP. HTTP is a "stateless" protocol which means each time a client retrieves a Webpage, the client opens a separate connection to the Web server and the server automatically does not keep any record of previous client request. A 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. This entry means that, when the form is submitted, the specified name and value are automatically included in the GET or the POST data. You can append some extra data at the end of each URL. This data identifies the session; the server can associate that session identifier with the data it has stored about that session. URL rewriting is a better way to maintain sessions and works for the browsers when they don't support cookies. This interface provides a way to identify a user across.

By default, JSPs have session tracking enabled and a new HttpSession object is instantiated for each new client automatically. Since session object is already provided to the JSP programmer, the programmer can immediately begin storing and retrieving data from the object without any initialization or getSession. This method returns the object bound with the specified name in this session, or null if no object is bound under the name. This method returns an Enumeration of String objects containing the names of all the objects bound to this session.

This method returns the time when this session was created, measured in milliseconds since midnight January 1, GMT. This method returns the last time the client sent a request associated with the this session, as the number of milliseconds since midnight January 1, GMT.

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This method returns the maximum time interval, in seconds, that the servlet container will keep this session open between client accesses. This method returns true if the client does not yet know about the session or if the client chooses not to join the session. This method specifies the time, in seconds, between client requests before the servlet container will invalidate this session.

This example describes how to use the HttpSession object to find out the creation time and the last-accessed time for a session. We would associate a new session with the request if one does not already exist. The timeout is expressed as minutes, and overrides the default timeout which is 30 minutes in Tomcat. The getMaxInactiveInterval method in a servlet returns the timeout period for that session in seconds.

So if your session is configured in web. An uploaded file can be a text file or a binary or an image file or just any document. Let us now understand how to create a file upload form.

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The following HTML code creates an uploader form. The form action attribute should be set to a JSP file which would handle file uploading at backend server. Following example is using uploadFile. To allow multiple files uploading, include more than one input tag with different values for the name attribute. The browser associates a Browse button with each of them.


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This will display the following result. Let us now define a location where the uploaded files will be stored. You can hard code this in your program or this directory name can also be added using an external configuration such as a context-param element in web. Following is the source code for UploadFile. This can handle uploading of multiple files at a time. Let us now consider the following before proceeding with the uploading of files. The following example depends on FileUpload ; make sure you have the latest version of commons-fileupload.

FileUpload depends on Commons IO; make sure you have the latest version of commons-io-x. While testing the following example, you should upload a file which is of less size than maxFileSize otherwise the file will not be uploaded. Now try to upload files using the HTML form which you created above. This will help you upload any file from your local machine. In this chapter, we will discuss how to handle data in JSP. One of the most important advantages of using JSP is that you can use all the methods available in core Java.

We will take you through the Date class which is available in the java. The Date class supports two constructors. The first constructor initializes the object with the current date and time. The following constructor accepts one argument that equals the number of milliseconds that have elapsed since midnight, January 1, Returns true if the invoking Date object contains a date that is later than the one specified by date, otherwise, it returns false.