kalkulator servlet sederhana
Langkah- langkah membuat kalkulator servlet sederhana :
1. Open NetBin
2. Klik New Project, kemudian pilih Java Web ----> Web Application ----> Klik Next
3. Tuliskan nama project
4. Pilih server Apache Tomcat 6.0.26, Java EE5 lalu Klik Finish
5. Kemudian buat file calculator.jsp
Caranya :
· klik kanan pada project à New à JSP
· kemudian isikan name file
· Klik Finish
6. Kemudian ubah title JSP, tulis pada tag <title> Kalkulator </title> (titlenya bisa yang lainnya) lalu tuliskan script berikut ini
tulis pada tag <title> Kalkulator </title> (titlenya bisa yang lainnya) lalu tuliskan script berikut ini
html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>KALKULATOR</title>
<script LANGUAGE="JavaScript">
function addChar(input, character) {
if(input.value == null || input.value == "0")
input.value = character
else
input.value += character
}
function cos(form) {
form.display.value = Math.cos(form.display.value);
}
function sin(form) {
form.display.value = Math.sin(form.display.value);
}
function tan(form) {
form.display.value = Math.tan(form.display.value);
}
function sqrt(form) {
form.display.value = Math.sqrt(form.display.value);
}
function ln(form) {
form.display.value = Math.log(form.display.value);
}
function exp(form) {
form.display.value = Math.exp(form.display.value);
}
function deleteChar(input) {
input.value = input.value.substring(0, input.value.length - 1)
}
function changeSign(input) {
if(input.value.substring(0, 1) == "-")
input.value = input.value.substring(1, input.value.length)
else
input.value = "-" + input.value
}
function compute(form) {
form.display.value = eval(form.display.value)
}
function square(form) {
form.display.value = eval(form.display.value) * eval(form.display.value)
}
function checkNum(str) {
for (var i = 0; i < str.length; i++) {
var ch = str.substring(i, i+1)
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch != "-" && ch != "." && ch != "(" && ch!= ")") {
alert("invalid entry!")
return false
}
}
}
return true
}
</script>
</head>
7. Kemudian Tuliskan Syntax berikut pada tag <body>:
<body>
<form NAME="sci-calc">
<TABLE CELLSPACING="0" CELLPADDING="1">
<TR>
<TD COLSPAN="5" ALIGN="center"><INPUT NAME="display" VALUE="0" SIZE="28" MAXLENGTH="25"></TD>
</TR>
<TR>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" exp " ONCLICK="if (checkNum(this.form.display.value)) { exp(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 7 " ONCLICK="addChar(this.form.display, '7')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 8 " ONCLICK="addChar(this.form.display, '8')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 9 " ONCLICK="addChar(this.form.display, '9')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" / " ONCLICK="addChar(this.form.display, '/')"></TD>
</TR>
<TR>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" ln " ONCLICK="if (checkNum(this.form.display.value)) { ln(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 4 " ONCLICK="addChar(this.form.display, '4')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 5 " ONCLICK="addChar(this.form.display, '5')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 6 " ONCLICK="addChar(this.form.display, '6')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" * " ONCLICK="addChar(this.form.display, '*')"></TD>
</TR>
<TR>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" sqrt " ONCLICK="if (checkNum(this.form.display.value)) { sqrt(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 1 " ONCLICK="addChar(this.form.display, '1')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 2 " ONCLICK="addChar(this.form.display, '2')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 3 " ONCLICK="addChar(this.form.display, '3')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" - " ONCLICK="addChar(this.form.display, '-')"></TD>
</TR>
<TR>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" sq " ONCLICK="if (checkNum(this.form.display.value)) { square(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" 0 " ONCLICK="addChar(this.form.display, '0')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" . " ONCLICK="addChar(this.form.display, '.')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" +/- " ONCLICK="changeSign(this.form.display)"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" + " ONCLICK="addChar(this.form.display, '+')"></TD>
</TR>
<TR>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" ( " ONCLICK="addChar(this.form.display, '(')"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE="cos" ONCLICK="if (checkNum(this.form.display.value)) { cos(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" sin" ONCLICK="if (checkNum(this.form.display.value)) { sin(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" tan" ONCLICK="if (checkNum(this.form.display.value)) { tan(this.form) }"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE=" ) " ONCLICK="addChar(this.form.display, ')')"></TD>
</TR>
<TR>
<TD ALIGN="center"><INPUT TYPE="button" VALUE="clear" ONCLICK="this.form.display.value = 0 "></TD>
<TD ALIGN="center" COLSPAN="3"><INPUT TYPE="button" VALUE="backspace" ONCLICK="deleteChar(this.form.display)"></TD>
<TD ALIGN="center"><INPUT TYPE="button" VALUE="enter" NAME="enter" ONCLICK="if (checkNum(this.form.display.value)) { compute(this.form) }"></TD>
</TR>
</TABLE>
</form>
</body>
</html>
8. Setelah itu membuat MainServlet.java untuk memproses dan memanggil file Kalkulator.jsp
Caranya :
· Klik Kanan pada Project ----> New ----> Servlet
· isikan class name dan package
· Klik Next ----> Klik Finish
9. Tuliskan syntax berikut pada tag try { "Syntax"}:
10. Untuk menjalankan servletnya kita harus merubah web.xml
Caranya:
· Buka web.xml : Web Pages ----> WEB INF
· kemudian ubah Welcome files menjadi MainServlet
11. Setelah semua proses selesai . Build dan Run project tersebut
12. Output
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