/*
* GetGrade.java 97/12/04
*
* Copyright (c) 1997 Ralph Freese
*
*/
import java.io.*;
import java.util.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* Get Grade servlet. This servlet let students lookup their grades on
* the net.
*
* There are no init parameters. We use a hidden field to specify
* where the grade file is.
*
* fields:
*
* socsecno the students SS#.
* filename file with grades (hidden)
*
*
* @version 1.0, 97/12/04
* @author Ralph Freese
*/
public class GetGrade extends HttpServlet {
private String gradeFile;
private String line1 = null;
private String line2 = null;
public void doPost (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
doGet(req, res);
}
public void doGet (HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
gradeFile = req.getParameter("filename");
String socsecno = req.getParameter("socsecno");
res.setContentType("text/html");
ServletOutputStream out = res.getOutputStream();
if (!checkSS(socsecno)) {
out.println("");
out.println("Bad SS");
out.println("");
out.println("Bad Social Security Number:
");
out.println("You must fill in all 9 digits.");
out.println("Do not put any dashes.");
out.println("You can press your back button to go back and ");
out.println("and fill in again.");
out.println("");
} else {
String gradeLine = getGradeLine(socsecno);
if (gradeLine == null) {
out.println("");
out.println("
Grade Not Found");
out.println("");
out.println("Grade Not Found
");
out.println("Sorry, your grade was not found.");
out.println("Be sure your Social Security number is correct.");
out.println("You can press your back button to go back and ");
out.println("and fill in again.");
out.println("");
} else {
out.println("");
out.println("
Grades");
out.println("");
out.println("");
out.println("| " + line1 + " |
|---|
");
out.println("" + line2 + " |
");
out.println("" + gradeLine + " |
");
out.println("
");
out.println("");
}
}
}
public boolean checkSS(String ss) {
if (ss.length() != 9) { return false; }
String ss_cap = ss.toUpperCase();
if (! ss.equals(ss_cap)) { return false; }
return true;
}
public String getGradeLine(String ss) {
FileReader f = null;
try {
f = new FileReader(gradeFile);
} catch (FileNotFoundException e) {
System.out.println("file not found"); }
BufferedReader file = new BufferedReader(f);
String line = null;
boolean found = false;
try {
line1 = file.readLine();
if (line1 != null) { line2 = file.readLine(); }
if (line2 != null) {
while (!found && (line = file.readLine()) != null) {
if (line.startsWith(ss)) { found = true; }
}
} else { line = "The grade file was defective---tell your teacher"; }
} catch (IOException e) { System.out.println("IOException"); }
return line;
}
}