用javaweb写出部门员工管理系统

好的，我可以提供一个简单的示例来实现部门员工管理系统。这个系统将包括以下功能： 1. 添加、编辑和删除部门信息 2. 添加、编辑和删除员工信息 3. 显示部门和员工列表首先，您需要创建一个数据库来存储部门和员工信息。以下是一个示例的SQL脚本来创建一个DEPARTMENT表和一个EMPLOYEE表： ``` CREATE TABLE DEPARTMENT ( DEPT_ID INT NOT NULL AUTO_INCREMENT, DEPT_NAME VARCHAR(50) NOT NULL, PRIMARY KEY (DEPT_ID) ); CREATE TABLE EMPLOYEE ( EMP_ID INT NOT NULL AUTO_INCREMENT, EMP_NAME VARCHAR(50) NOT NULL, EMP_DEPT INT NOT NULL, EMP_EMAIL VARCHAR(50), PRIMARY KEY (EMP_ID), FOREIGN KEY (EMP_DEPT) REFERENCES DEPARTMENT(DEPT_ID) ); ``` 然后，您需要创建一个Java Web应用程序，并添加一个Servlet来处理请求。以下是一个示例的Servlet代码： ```java @WebServlet("/employees") public class EmployeeServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List<Employee> employees = EmployeeDAO.getAllEmployees(); request.setAttribute("employees", employees); request.getRequestDispatcher("/employees.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String action = request.getParameter("action"); if ("add".equals(action)) { String name = request.getParameter("name"); String email = request.getParameter("email"); int deptId = Integer.parseInt(request.getParameter("deptId")); Employee employee = new Employee(name, email, deptId); EmployeeDAO.addEmployee(employee); } else if ("edit".equals(action)) { int id = Integer.parseInt(request.getParameter("id")); String name = request.getParameter("name"); String email = request.getParameter("email"); int deptId = Integer.parseInt(request.getParameter("deptId")); Employee employee = new Employee(id, name, email, deptId); EmployeeDAO.updateEmployee(employee); } else if ("delete".equals(action)) { int id = Integer.parseInt(request.getParameter("id")); EmployeeDAO.deleteEmployee(id); } response.sendRedirect(request.getContextPath() + "/employees"); } } ``` 这个Servlet处理了GET和POST请求。GET请求用于显示员工列表，而POST请求用于添加、编辑或删除员工。当用户单击添加、编辑或删除按钮时，JavaScript代码将向Servlet发送POST请求，并将相应的参数发送到Servlet。您还需要创建一个JSP页面来显示部门和员工列表。以下是一个示例的JSP页面代码： ```html <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Employee Management System</title> </head> <body> <h1>Employee Management System</h1> <h2>Employees</h2> <table> <thead> <tr> <th>ID</th> <th>Name</th> <th>Email</th> <th>Department</th> <th>Action</th> </tr> </thead> <tbody> <c:forEach var="employee" items="${employees}"> <tr> <td>${employee.id}</td> <td>${employee.name}</td> <td>${employee.email}</td> <td>${employee.department.name}</td> <td> <form method="post" action="${pageContext.request.contextPath}/employees"> <input type="hidden" name="id" value="${employee.id}"> <input type="hidden" name="deptId" value="${employee.department.id}"> <input type="hidden" name="email" value="${employee.email}"> <input type="hidden" name="action" value="edit"> <button type="submit">Edit</button> </form> <form method="post" action="${pageContext.request.contextPath}/employees"> <input type="hidden" name="id" value="${employee.id}"> <input type="hidden" name="deptId" value="${employee.department.id}"> <input type="hidden" name="email" value="${employee.email}"> <input type="hidden" name="action" value="delete"> <button type="submit">Delete</button> </form> </td> </tr> </c:forEach> </tbody> </table> <h2>Add Employee</h2> <form method="post" action="${pageContext.request.contextPath}/employees"> <input type="text" name="name" placeholder="Name" required> <input type="email" name="email" placeholder="Email" required> <select name="deptId" required> <option value="">-- Select Department --</option> <c:forEach var="department" items="${departments}"> <option value="${department.id}">${department.name}</option> </c:forEach> </select> <input type="hidden" name="action" value="add"> <button type="submit">Add</button> </form> <h2>Departments</h2> <table> <thead> <tr> <th>ID</th> <th>Name</th> <th>Action</th> </tr> </thead> <tbody> <c:forEach var="department" items="${departments}"> <tr> <td>${department.id}</td> <td>${department.name}</td> <td> <form method="post" action="${pageContext.request.contextPath}/departments"> <input type="hidden" name="id" value="${department.id}"> <input type="hidden" name="name" value="${department.name}"> <input type="hidden" name="action" value="edit"> <button type="submit">Edit</button> </form> <form method="post" action="${pageContext.request.contextPath}/departments"> <input type="hidden" name="id" value="${department.id}"> <input type="hidden" name="action" value="delete"> <button type="submit">Delete</button> </form> </td> </tr> </c:forEach> </tbody> </table> <h2>Add Department</h2> <form method="post" action="${pageContext.request.contextPath}/departments"> <input type="text" name="name" placeholder="Name" required> <input type="hidden" name="action" value="add"> <button type="submit">Add</button> </form> </body> </html> ``` 这个JSP页面呈现了一个表格，其中包含员工和部门列表。它还包括一个表单，用户可以使用它来添加新的员工或部门。当用户单击编辑或删除按钮时，JavaScript代码将向Servlet发送POST请求，并将相应的参数发送到Servlet。最后，您需要创建一个DAO类来处理数据库操作。以下是一个示例的DAO类代码： ```java public class EmployeeDAO { public static List<Employee> getAllEmployees() { List<Employee> employees = new ArrayList<>(); try (Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "password")) { String sql = "SELECT * FROM EMPLOYEE JOIN DEPARTMENT ON EMPLOYEE.EMP_DEPT = DEPARTMENT.DEPT_ID"; try (PreparedStatement stmt = conn.prepareStatement(sql)) { try (ResultSet rs = stmt.executeQuery()) { while (rs.next()) { int id = rs.getInt("EMP_ID"); String name = rs.getString("EMP_NAME"); String email = rs.getString("EMP_EMAIL"); int deptId = rs.getInt("EMP_DEPT"); String deptName = rs.getString("DEPT_NAME"); Department department = new Department(deptId, deptName); Employee employee = new Employee(id, name, email, department); employees.add(employee); } } } } catch (SQLException e) { e.printStackTrace(); } return employees; } public static void addEmployee(Employee employee) { try (Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "password")) { String sql = "INSERT INTO EMPLOYEE (EMP_NAME, EMP_EMAIL, EMP_DEPT) VALUES (?, ?, ?)"; try (PreparedStatement stmt = conn.prepareStatement(sql)) { stmt.setString(1, employee.getName()); stmt.setString(2, employee.getEmail()); stmt.setInt(3, employee.getDepartment().getId()); stmt.executeUpdate(); } } catch (SQLException e) { e.printStackTrace(); } } public static void updateEmployee(Employee employee) { try (Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "password")) { String sql = "UPDATE EMPLOYEE SET EMP_NAME = ?, EMP_EMAIL = ?, EMP_DEPT = ? WHERE EMP_ID = ?"; try (PreparedStatement stmt = conn.prepareStatement(sql)) { stmt.setString(1, employee.getName()); stmt.setString(2, employee.getEmail()); stmt.setInt(3, employee.getDepartment().getId()); stmt.setInt(4, employee.getId()); stmt.executeUpdate(); } } catch (SQLException e) { e.printStackTrace(); } } public static void deleteEmployee(int id) { try (Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb", "root", "password")) { String sql = "DELETE FROM EMPLOYEE WHERE EMP_ID = ?"; try (PreparedStatement stmt = conn.prepareStatement(sql)) { stmt.setInt(1, id); stmt.executeUpdate(); } } catch (SQLException e) { e.printStackTrace(); } } } ``` 这个DAO类处理了所有的数据库操作，例如获取员工列表、添加新员工、更新员工信息和删除员工。它使用JDBC API来与MySQL数据库进行通信。这是一个非常简单的示例，但它可以帮助您了解如何使用Java Web技术来创建部门员工管理系统。您可以根据自己的需求进行修改和扩展。

用javaweb写出部门员工管理系统

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