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My application URL :
http://localhost:8080/Application/Login.jsp. When a user
enter this url in IE then, how it get Login.JSP Page
exactly? what are the processes will happen from when we
submit the URL to get Login.jsp?
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Answer Posted / jishnu
When ever a URL is hit the first thing happens is DNS resolution. There is a dns cache at browers level, then OS level, then at router level, then ISP level and global dns server level. Since this is localhost, it will check in browser if not found at OS and since its localhost OS will resolve it as 127.0.0.1
The Application/Webserver running at port 8080 so the request is sent to server who looks for "Application" in root level and looks for Login.jsp.
If the request is for the first time the webserver compiles the jsp and compiled jsp class have a method _jspService. The result of the _jspService is send back to the brower.
Regards,
Jishnu
| Is This Answer Correct ? | 8 Yes | 2 No |
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The following program reads data (details of students) from a file named students.txt and converts it into e-mail addresses. The results are written to a file named studentemail.txt. students.txt consists of a number of lines, each containing the data of a student in colon delimited format: Last Name:First Name:Student Number Each input record is converted to an e-mail address and written to studentemail.txt in the following format: the first character of the last name + the first character of the first name + the last four digits of the student number + “@myunisa.ac.za” import java.io.*; public class EmailConverter { public static void main(String[] args) throws IOException { BufferedReader input = new BufferedReader(new FileReader ("students.txt")); PrintWriter output = new PrintWriter(new FileWriter ("studentemail.txt")); String line = input.readLine(); while (line != null) { // Extract the information for each student String[] items = line.split(":"); // Generate the email address String email = "" + items[0].charAt(0) + items[1].charAt(0) + items[2].substring(4,8) + "@myunisa.ac.za"; email = email.toLowerCase(); // Output output.println(email); line = input.readLine(); } input.close(); output.close(); } } Rewrite the class so that it handles possible errors that may occur. In particular, it should do the following: • It should catch at least three appropriate exceptions that might occur, and display suitable messages. • At this stage, the program will not run correctly if there is an empty line in the input file. Change the program so that if an empty line is encountered, an exception is thrown and the empty line is ignored. This exception should be handled with the display of a suitable error message. • Before the e-mail address is added to the output file, check if the student number has 8 digits. If not, throw an InvalidFormatException (which the program should not handle itself)
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