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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<div>
<form action = "add2" method="post">
<div>
<label>x:</label><input name="num" type="text"/>
</div>
<div>
<label>y:</label><input name="num" type="text"/>
</div>
<div>
<input type="submit" value="덧셈"/>
</div>
</form>
</div>
</body>
</html>num이라는 이름으로 값을 받으면 post 요청할 때 배열로 넘겨준다
다라서 req에서 num 값을 가져올 때 getParameter가 아닌 getParameterValues라는 메소드를 써야한다
package com.newlec.web;
import java.io.IOException;
import java.io.PrintWriter;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
@WebServlet("/add2")
public class Add2 extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
PrintWriter out = res.getWriter();
res.setCharacterEncoding("UTF-8");
res.setContentType("text/html; charset=UTF-8");
String[] num = req.getParameterValues("num");
int result = 0;
for (int i =0; i<num.length; i++) {
int num_ = Integer.parseInt(num[i]);
result+=num_;
}
out.println(result);
}
}반응형
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