Develop: web–application using servlets in accordance to the scenario below

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Task №1

Develop: web–application using servlets in accordance to the scenario below.

Scenario

index.htm

Controls: text field First Name, text field Last Name, radio buttons (mister, missis, miss), button Welcome.

First Name

Last Name

O

mister

O

missis

O

miss

Welcome

Activity. User fills the form and presses the button Welcome.

Main workflow. The servlet /result is loaded.

Alternative workflow. Some of the elements is absent. The page index.htm is loaded with error description.

Servlet /result

Controls: reference Main.

Main workflow. User gets the greeting accordingly to the current time.

Task №2

Develop web–application using servlets in accordance to the scenario below.

Initial data

in.properties

numbers= val1, val2, … , valK

control= type

where val1, val2, … , valK are floating–point numbers; type is text or label.

Scenario

Servlet /data

Controls: K pairs – checkbox and value presented as text field or label accordingly to the file in.properties, references Sum, Max, Min, Avg.

val1

val2

. . .

valK

Sum       Max     Min     Avg.

Activity. User fills the form and clicks some reference.

Main workflow. The servlet /result is loaded.

Alternative workflow. Field numbers in the file in.properties contains no values. User gets the message No values in the file in.properties...

Servlet /result

Controls: reference Main.

Main workflow. User gets the result of an appropriate processing in the following format:

operationName(val1, val2, …) = resultValue

or

No values in the request...

where operationName is Sum, Min, Max or Avg;

val1, val2, … – request values. If some value val is nonnumeric then it is omitted.

resultValue is the result of the operation.

User clicks Main reference and returns to the servlet /data.

Hint: learn the following example.

<HTML><HEAD>

<TITLE>test.html</TITLE>

</HEAD>

<BODY>

<form name="test" ACTION="/task2/result">

<input name="flag" type="checkbox" value="0">&nbsp;

<input name="val" type="input" value="135" readonly><br>

<input name="flag" type="checkbox" value="1">&nbsp;

<input name="val" type="input" value="71" readonly><br>

<input name="flag" type="checkbox" value="2">&nbsp;

<input name="val" type="input" value="-100" readonly><br>

<INPUT TYPE="SUBMIT" NAME="go" VALUE="Go">

</form>

<form name="test1" ACTION="/task2/result">

<input name="flag" type="checkbox" value="0">&nbsp;

<input name="val" type="input" value="135"><br>

<input name="flag" type="checkbox" value="1">&nbsp;

<input name="val" type="input" value="71"><br>

<input name="flag" type="checkbox" value="2">&nbsp;

<input name="val" type="input" value="-100"><br>

<INPUT TYPE="SUBMIT" NAME="go" VALUE="Go">

</form>

<form name="test2" ACTION="/task2/result">

<input name="flag" type="checkbox" value="135">&nbsp;

135<br>

<input name="flag" type="checkbox" value="71">&nbsp;

71<br>

<input name="flag" type="checkbox" value="-100">&nbsp;

-100<br>

<INPUT TYPE="SUBMIT" NAME="go" VALUE="Go">

</form>

<form name="test3" ACTION="/task2/result">

<input name="flag" type="checkbox" value="135">&nbsp;

<input name="val" type="input" value="135"><br>

<input name="flag" type="checkbox" value="71">&nbsp;

<input name="val" type="input" value="71"><br>

<input name="flag" type="checkbox" value="-100">&nbsp;

<input name="val" type="input" value="-100"><br>

<INPUT TYPE="SUBMIT" NAME="go" VALUE="Go"

onClick="for(i=0;i<test3.val.length;i++)test3.flag[i].value=test3.val[i].value;">

</form>

</BODY> </HTML>

//part of ="/task2/result

public class HelloWorld extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response)

throws ServletException, IOException {

PrintWriter out = response.getWriter();

String[] flags = request.getParameterValues("flag");

if(flags==null) {

out.println("No values in the request...");

} else {

for(int i=0; i<flags.length;i++) {

out.println(flags[i]);

}

}

}

}

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