JavaBea+JSP、Servlet+JSP、JavaBean+Servlet+JSP实现复数运算器

冷不防 2024-03-16 12:37 37阅读 0赞

**目录**

JavaBea+JSP

代码：

JavaBea

JSP

Servlet+JSP

代码：

Servlet：

JSP：

JavaBean+Servlet+JSP

代码：

JavaBean：

Servlet：

JSP：

--------------------

## JavaBea+JSP ##

### 代码： ###

#### JavaBea ####

public class Complex {
        private double a;
        private double b;
        public Complex(double a, double b) {
            this.a = a;
            this.b = b;
        }
        public Complex add(Complex c) {
            return new Complex(this.a + c.a, this.b + c.b);
        }
        public Complex subtract(Complex c) {
            return new Complex(this.a - c.a, this.b - c.b);
        }
        public Complex multiply(Complex c) {
            double a = this.a * c.a - this.b * c.b;
            double b = this.a * c.b + this.b * c.a;
            return new Complex(a, b);
        }
        public Complex divide(Complex c) {
            double denominator = c.a * c.a + c.b * c.b;
            double a = (this.a * c.a + this.b * c.b) / denominator;
            double b = (this.b * c.a - this.a * c.b) / denominator;
            return new Complex(a, b);
        }
        public double getA() {
            return a;
        }
        public void setA(double a) {
            this.a = a;
        }
        public double getB() {
            return b;
        }
        public void setB(double b) {
            this.b = b;
        }
    }

#### JSP ####

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%@ page import="com.dong.demo4.bean" %>
    <%@ page import="com.dong.demo4.bean.Complex" %>
    <html>
    <head>
    <title>复数计算器</title>
    </head>
    <body>
    <h1>复数计算器</h1>
    <form method="post">
    <label>第一个复数：</label>
    <input type="text" name="num1">
    <label>+</label>
    <input type="text" name="num2">i
    <br>
    <label>第二个复数：</label>
    <input type="text" name="num3">
    <label>+</label>
    <input type="text" name="num4">i
    <br>
    <label>运算符：</label>
    <select name="operator">
    <option value="+">加法</option>
    <option value="-">减法</option>
    <option value="*">乘法</option>
    <option value="/">除法</option>
    </select>
    <br>
    <br>
    <input type="submit" name="submit" value="计算">
    </form>
    <% if (request.getParameter("submit") != null) { %>
    <br>
    <h2>计算结果：</h2>
    <% double num1 = Double.parseDouble(request.getParameter("num1")); %>
    <% double num2 = Double.parseDouble(request.getParameter("num2")); %>
    <% double num3 = Double.parseDouble(request.getParameter("num3")); %>
    <% double num4 = Double.parseDouble(request.getParameter("num4")); %>
    <% Complex c1 = new Complex(num1, num2); %>
    <% Complex c2 = new Complex(num3, num4); %>
    <%
            String op = request.getParameter("operator");
            Complex result = null;
            switch (op) {
            case "+":
            result = c1.add(c2);
            break;
            case "-":
            result = c1.subtract(c2);
            break;
            case "*":
            result = c1.multiply(c2);
            break;
            case "/":
            result = c1.divide(c2);
            break;
    default:
            break;
            }
            %>
    <p><%= result.getReal() %><%= result.getImaginary() >= 0 ? "+" : "-" %><%= Math.abs(result.getImaginary()) %>i</p>
    <% } %>
    </body>
    </html>

## Servlet+JSP ##

### 代码： ###

#### Servlet： ####

import java.io.IOException;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    @WebServlet("/complexCalculatorServlet ")
    public class ComplexCalculatorServlet extends HttpServlet {
        private static final long serialVersionUID = 1L;
        protected void doPost(HttpServletRequest request,
                              HttpServletResponse response) throws ServletException, IOException {
            double num1 = Double.parseDouble(request.getParameter("num1"));
            double num2 = Double.parseDouble(request.getParameter("num2"));
            double num3 = Double.parseDouble(request.getParameter("num3"));
            double num4 = Double.parseDouble(request.getParameter("num4"));
            String operator = request.getParameter("operator");
            double resultA = 0;
            double resultB = 0;
            switch (operator) {
                case "+":
                    resultA = num1 + num3;
                    resultB = num2 + num4;
                    break;
                case "-":
                    resultA = num1 - num3;
                    resultB = num2 - num4;
                    break;
                case "*":
                    resultA = num1 * num3 - num2 * num4;
                    resultB = num1 * num4 + num2 * num3;
                    break;
                case "/":
                    double denominator = num3 * num3 + num4 * num4;
                    resultA = (num1 * num3 + num2 * num4) / denominator;
                    resultB = (num2 * num3 - num1 * num4) / denominator;
                    break;
                default:
                    break;
            }
            // 将结果存储到 request 对象中
            request.setAttribute("resultA", resultA);
            request.setAttribute("resultB", resultB);
            // 转发请求到 JSP 页面
            request.getRequestDispatcher("/result.jsp").forward(request, response);
        }
    }

#### JSP： ####

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
    <title>复数计算器</title>
    </head>
    <body>
    <h1>复数计算器</h1>
    
    <form action="/complexCalculatorServlet"
            method="post">
    <label>第一个复数：</label>
    <input type="text" name="num1">
    <label>+</label>
    <input type="text" name="num2">i
    <br>
    
    <label>第二个复数：</label>
    <input type="text" name="num3">
    <label>+</label>
    <input type="text" name="num4">i
    <br>
    
    <label>运算符：</label>
    <select name="operator">
    <option value="+">加法</option>
    <option value="-">减法</option>
    <option value="*">乘法</option>
    <option value="/">除法</option>
    </select>
    <br>
    
    <br>
    <input type="submit" name="submit" value="计算">
    </form>
    
    <% if (request.getAttribute("resultA") != null) { %>
    <br>
    <h2>计算结果：</h2>
    <p><%= request.getAttribute("resultA") %><%= (Double)request.getAttribute("resultB") >= 0 ? "+" : "-" %><%= Math.abs((Double)request.getAttribute("resultB")) %>i</p>
    <% } %>
    </body>
    </html>

## JavaBean+Servlet+JSP ##

### 代码： ###

#### JavaBean： ####

package com.dong.demo1;
    
    /**
     * 模式三：JavaBean+Servlet+JSP
     */
    
    /**
     * 复数类---JavaBean类
     */
    public class Complex {
        private double real;//实部
        private double imaginary;//虚部
    
        public Complex() {
        }
    
        public Complex(double real, double imaginary) {
            this.real = real;
            this.imaginary = imaginary;
        }
    
        /**
         * @Discription 加法
         * @author Lidong
         * @param other
         * @return
         */
        public Complex add(Complex other) {
            return new Complex(this.real + other.real, this.imaginary + other.imaginary);
        }
    
        /**
         * @Discription 减法
         * @author Lidong
         * @param other
         * @return
         */
        public Complex subtract(Complex other) {
            return new Complex(this.real - other.real, this.imaginary - other.imaginary);
        }
    
        /**
         * @Discription 乘法
         * @author Lidong
         * @param other
         * @return
         */
        public Complex multiply(Complex other) {
            double realPart = this.real * other.real - this.imaginary * other.imaginary;
            double imaginaryPart = this.real * other.imaginary + this.imaginary * other.real;
            return new Complex(realPart, imaginaryPart);
        }
    
        /**
         * @Discription 除法
         * @author Lidong
         * @param other
         * @return
         * @throws ArithmeticException
         */
        public Complex divide(Complex other) throws ArithmeticException {
            double denominator = other.real * other.real + other.imaginary * other.imaginary;
            if (denominator == 0) {
                throw new ArithmeticException("Divide by zero!");
            }
            double realPart = (this.real * other.real + this.imaginary * other.imaginary) / denominator;
            double imaginaryPart = (-this.real * other.imaginary + this.imaginary * other.real) / denominator;
            return new Complex(realPart, imaginaryPart);
        }
    
        public double getReal() {
            return real;
        }
    
        public void setReal(double real) {
            this.real = real;
        }
    
        public double getImaginary() {
            return imaginary;
        }
    
        public void setImaginary(double imaginary) {
            this.imaginary = imaginary;
        }
    }

#### Servlet： ####

package com.dong.demo1;
    
    import javax.servlet.*;
    import javax.servlet.http.*;
    import javax.servlet.annotation.*;
    import java.io.IOException;
    
    @WebServlet("/complexCalc")
    public class ComplexCalcServlet extends HttpServlet {
       // private static final long serialVersionUID = 1L;
    
        @Override
        protected void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
    
            //获取第一个复数
            String real1Str = request.getParameter("real1");
            String imaginary1Str = request.getParameter("imaginary1");
    
            //获取第二个复数
            String real2Str = request.getParameter("real2");
            String imaginary2Str = request.getParameter("imaginary2");
    
            //获取运算符：{ +、 —— 、* 、/ }
            String operator = request.getParameter("operator");
    
    
            double real1 = Double.parseDouble(real1Str);
            double imaginary1 = Double.parseDouble(imaginary1Str);
    
    
            double real2 = Double.parseDouble(real2Str);
            double imaginary2 = Double.parseDouble(imaginary2Str);
    
    
            Complex complex1 = new Complex(real1, imaginary1);
            Complex complex2 = new Complex(real2, imaginary2);
            Complex result;
    
            switch (operator) {
                case "+":
                    result = complex1.add(complex2);
                    break;
                case "-":
                    result = complex1.subtract(complex2);
                    break;
                case "*":
                    result = complex1.multiply(complex2);
                    break;
                case "/":
                    try {
                        result = complex1.divide(complex2);
                    } catch (ArithmeticException e) {
                        request.setAttribute("error", e.getMessage());
                        request.getRequestDispatcher("/complex.jsp").forward(request, response);
                        return;
                    }
                    break;
                default:
                    throw new IllegalArgumentException("无效的操作!");
            }
    
            request.setAttribute("result", result);
            request.getRequestDispatcher("/result.jsp").forward(request, response);
        }
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
            this.doPost(request,response);
        }
    }

#### JSP： ####

*  输入页面：

<%--
      Created by IntelliJ IDEA.
      User: CaptainDong
      Date: 2023/5/31
      Time: 10:42
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>复数计算器</title>
    </head>
    <body>
    <h1>复数计算器</h1>
    <form method="post" action="complexCalc">
        <p>
            <label for="real1">请输入第一个复数:</label>
            <input type="text" name="real1" id="real1">
            +<input type="text" name="imaginary1" id="imaginary1"> i
        </p>
        <p>
            <label for="real2">请输入第二个复数:</label>
            <input type="text" name="real2" id="real2">
            +<input type="text" name="imaginary2" id="imaginary2"> i
        </p>
        <p>
            <label for="operator">请选择一个运算符:</label>
            <select name="operator" id="operator">
                <option value="+">+</option>
                <option value="-">-</option>
                <option value="*">*</option>
                <option value="/">/</option>
            </select>
        </p>
        <input type="submit" value="计算" style="width:90px;height:30px;">
    </form>
    
    <c:if test="${not empty result}">
        <h2>结果如下:</h2>
        <p>${result.real} + ${result.imaginary}i</p>
    </c:if>
    
    <c:if test="${not empty error}">
        <h2>错误:</h2>
        <p>${error}</p>
    </c:if>
    </body>
    </html>

*  结果展示：

<%@ page import="com.dong.demo1.Complex" %>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%--
      Created by IntelliJ IDEA.
      User: CaptainDong
      Date: 2023/5/31
      Time: 11:07
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>运算结果</title>
    </head>
    <body>
    <h2>结果如下:</h2>
    <p>
        <%
            Complex result= (Complex) request.getAttribute("result");
            String s1=result.getReal()+" "+"+"+"("+result.getImaginary()+" "+"i"+")";
        %>
        <%=s1%>
    </p>
    
    <c:if test="${not empty result}">
      <h2>结果如下:</h2>
      <p>${result.real} + ${result.imaginary}i</p>
    </c:if>
    
    <c:if test="${not empty error}">
      <h2>错误信息:</h2>
      <p>${error}</p>
    </c:if>
    </body>
    </html>