RequestTest02.java
package kr.or.ddit.basic.reqreusp;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/requestTest02.do")
public class RequestTest02 extends HttpServlet{
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String strNum1 = request.getParameter("num1");
String op = request.getParameter("op");
String strNum2 = request.getParameter("num2");
int num1 = Integer.parseInt(strNum1);
int num2 = Integer.parseInt(strNum2);
double result = 0; //계산 결과가 저장될 변수
boolean calcOk = true; //계산 성공 여부를 나타내는 변수
switch(op) {
case "+" : result = num1 + num2;break;
case "-" : result = num1 - num2;break;
case "*" : result = num1 * num2;break;
case "/" :
if(num2==0) {
calcOk = false;
}else {
result = (double)num1 / num2;break;
}
case "%" :
if(num2==0) {
calcOk = false;
}else {
result = (double)num1 % num2;
}
break;
}
//출력하는 객체
response.setCharacterEncoding("utf-8");
response.setContentType("text/html; charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<html><head><meta charset='utf-8'>");
out.println("<title> Request 객체 연습2 </title></head>");
out.println("<body>");
out.println("<h3>계산 결과</h3><hr>");
out.println(num1 + "" + op + "" + num2 +"=");
if(calcOk==true) {
out.println(result+"<br>");
}else {
out.println("계산 불능(0으로 나눔)<br>");
}
out.println("</body></html>");
}
}requestTest.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>request연습</title>
</head>
<body>
<h2>Request 연습 form (숫자 입력은 정수형으로 입력하세요.)</h2>
<form method="post" action="<%=request.getContextPath() %>/requestTest02.do">
<table>
<tr>
<td><input type="text" size="10" name="num1"></td>
<td>
<select name = "op">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
<option value="%">%</option>
</select>
</td>
<td><input type="text" size="10" name="num2"></td>
<td><input type="submit" value="확인"></td>
</tr>
<!--
결과 예시)
첫번째숫자 연산자 두번째 숫자 = 결과값
-->
</table>
</form>
</body>
</html>dfdf 서블릿임
package kr.or.ddit.basic.reqreusp;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class dfdf
*/
@WebServlet("/dfdf")
public class dfdf extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public dfdf() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
신입 개발자 입니다!!!