引自免费微信小程序：皆我百晓生
为了满足您的需求，我将分别介绍这两个课题的实现步骤和关键代码片段。由于篇幅较长，我将分开描述。
（一）Web程序实现复数运算
1. 创建JavaBean类
首先，创建一个名为ComplexNumber.java的JavaBean类，用于表示复数。
public class ComplexNumber {
private double real;
private double imaginary;
// 构造函数
public ComplexNumber(double real, double imaginary) {
this.real = real;
this.imaginary = imaginary;
}
// 获取和设置方法
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;
}
// 复数加法、减法、乘法、除法
public ComplexNumber add(ComplexNumber other) {
return new ComplexNumber(this.real + other.real, this.imaginary + other.imaginary);
}
public ComplexNumber subtract(ComplexNumber other) {
return new ComplexNumber(this.real - other.real, this.imaginary - other.imaginary);
}
public ComplexNumber multiply(ComplexNumber other) {
double realPart = this.real * other.real - this.imaginary * other.imaginary;
double imaginaryPart = this.real * other.imaginary + this.imaginary * other.real;
return new ComplexNumber(realPart, imaginaryPart);
}
public ComplexNumber divide(ComplexNumber other) {
double denominator = other.real * other.real + other.imaginary * other.imaginary;
double realPart = (this.real * other.real + this.imaginary * other.imaginary) / denominator;
double imaginaryPart = (this.imaginary * other.real - this.real * other.imaginary) / denominator;
return new ComplexNumber(realPart, imaginaryPart);
}
}
2. 创建Servlet
接下来，创建一个名为ComplexCalculatorServlet.java的Servlet，处理请求并返回结果。
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class ComplexCalculatorServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String operation = request.getParameter("operation");
String num1Real = request.getParameter("num1Real");
String num1Imaginary = request.getParameter("num1Imaginary");
String num2Real = request.getParameter("num2Real");
String num2Imaginary = request.getParameter("num2Imaginary");
ComplexNumber num1 = new ComplexNumber(Double.parseDouble(num1Real), Double.parseDouble(num1Imaginary));
ComplexNumber num2 = new ComplexNumber(Double.parseDouble(num2Real), Double.parseDouble(num2Imaginary));
ComplexNumber result = null;
switch (operation) {
case "add":
result = num1.add(num2);
break;
case "subtract":
result = num1.subtract(num2);
break;
case "multiply":
result = num1.multiply(num2);
break;
case "divide":
if (num2.getReal() != 0 && num2.getImaginary() != 0) {
result = num1.divide(num2);
} else {
throw new IllegalArgumentException("Cannot divide by zero.");
}
break;
default:
throw new ServletException("Invalid operation: " + operation);
}
request.setAttribute("result", result);
RequestDispatcher dispatcher = request.getRequestDispatcher("result.jsp");
dispatcher.forward(request, response);
}
}
3. 创建JSP页面
然后，创建两个JSP文件：index.jsp用于输入数据和选择运算，result.jsp显示计算结果。
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
Complex Number Calculator
Complex Number Calculator
result.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
Result
Result
Result: ${result.real} + (${result.imaginary})i
（二）图书管理系统
1. 数据库表结构
创建一个名为books的表，存储图书信息。
| Field | Type | Null | Key | Default | Extra | |-------------|--------------|------|-----|---------|-------| | id | int(11) | NO | PRI | NULL | auto_increment | | title | varchar(255) | NO | | NULL | | | author | varchar(255) | NO | | NULL | | | price | decimal(10,2)| NO | | NULL | | | remarks | text | YES | | NULL | |
2. 创建JavaBean类
创建Book.java和User.java两个JavaBean类。
Book.java
public class Book {
private int id;
private String title;
private String author;
private double price;
private String remarks;
// getters and setters...
}
User.java
public class User {
private int id;
private String username;
private String password;
private boolean isAdmin;
// getters and setters...
}
3. 创建DAO层接口和实现类
创建BookDao.java和UserDao.java接口，以及相应的实现类（例如HibernateBookDao.java和HibernateUserDao.java）。
4. 创建Service层
创建BookService.java和UserService.java，封装业务逻辑。
5. 创建Servlet
根据需求创建多个Servlet，如RegisterServlet, LoginServlet, AdminServlet, 和UserServlet。
6. 创建JSP页面
创建多个JSP页面，如register.jsp, login.jsp, admin.jsp, user.jsp, search.jsp, borrow.jsp, 和returnBook.jsp。
7. 配置Spring MVC和Hibernate
配置Spring MVC和Hibernate的XML配置文件，包括数据源、SessionFactory、事务管理器、DAO和Service的bean定义。
8. 安全认证
使用Spring Security或其他安全框架实现用户登录验证和权限控制。
这是一个大型的项目，涉及到许多组件和配置，以上只给出了基础的框架和部分关键代码。你需要根据实际需求，逐步完善各个模块的功能，包括但不限于数据库连接、CRUD操作、页面跳转、错误处理、表单验证等。具体实现细节可能需要参考相关Spring MVC、Hibernate和Spring Security的文档，或者查阅其他教程来完成整个项目。
