JSP+Servlet制作简易计算器

以下是一个简易的JSP和Servlet相结合的计算器示例。假设我们有两个文本框用于输入数字，一个下拉列表用于选择运算符，并有一个按钮来提交表单并显示结果。

JSP页面（calculator.jsp）




<!DOCTYPE html>
<html>
<head>
    <title>简易计算器</title>
</head>
<body>
    <form action="CalculatorServlet" method="POST">
        数字1: <input type="text" name="number1" /><br/>
        数字2: <input type="text" name="number2" /><br/>
        运算符:
        <select name="operator">
            <option value="+">+</option>
            <option value="-">-</option>
            <option value="*">*</option>
            <option value="/">/</option>
        </select><br/>
        <input type="submit" value="计算" />
    </form>
    <br/>
    <% if (request.getAttribute("result") != null) { %>
        结果: <%= request.getAttribute("result") %>
    <% } %>
</body>
</html>

Servlet类（CalculatorServlet.java）




import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
public class CalculatorServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String number1Str = request.getParameter("number1");
        String number2Str = request.getParameter("number2");
        String operator = request.getParameter("operator");
 
        double number1 = Double.parseDouble(number1Str);
        double number2 = Double.parseDouble(number2Str);
        double result = 0;
 
        switch (operator) {
            case "+":
                result = number1 + number2;
                break;
            case "-":
                result = number1 - number2;
                break;
            case "*":
                result = number1 * number2;
                break;
            case "/":
                if (number2 != 0) {
                    result = number1 / number2;
                } else {
                    response.getWriter().write("除数不能为0");

JSP+Servlet制作简易计算器

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