add<电脑列表>

src/main/java/example/controller/ComputerServlet.java

@@ -0,0 +1,40 @@
+package example.controller;
+
+import example.model.Computer;
+import example.service.IComputerService;
+import example.service.impl.ComputerServiceImpl;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.sql.SQLException;
+import java.util.List;
+
+@WebServlet(urlPatterns = {"/computerList"})
+public class ComputerServlet extends HttpServlet {
+
+    IComputerService computerService = new ComputerServiceImpl();
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        String path = req.getServletPath();
+        switch (path) {
+            case "/computerList":
+                try {
+                    listServlet(req, resp);
+                } catch (SQLException e) {
+                    throw new RuntimeException(e);
+                }
+                break;
+        }
+    }
+
+    private void listServlet(HttpServletRequest req, HttpServletResponse resp) throws SQLException, ServletException, IOException {
+        List<Computer> computers= computerService.listComputer();
+        req.setAttribute("computers", computers);
+        req.getRequestDispatcher("computerList.jsp").forward(req, resp);
+    }
+}

src/main/java/example/dao/ComputerDao.java

@@ -0,0 +1,55 @@
+package example.dao;
+
+import example.model.Computer;
+import example.utils.DBUtils;
+import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanListHandler;
+
+import java.sql.SQLException;
+import java.util.List;
+
+public class ComputerDao {
+    private final QueryRunner queryRunner = new QueryRunner(DBUtils.getDataSource());
+
+    public int addComputer(String name, Double price, int stock) {
+        String sql = "insert into computer(name, price, stock) values(?, ?, ?)";
+        try {
+            return queryRunner.update(sql, name, price, stock);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return 0;
+    }
+
+    public int updateComputer(String name, Double price, int stock, int id) {
+        String sql = "update computer set name=?, price=?, stock=? where id=?";
+        try {
+            return queryRunner.update(sql, name, price, stock, id);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return 0;
+    }
+
+    public int deleteComputer(int id) {
+        String sql = "delete from computer where id=?";
+        try {
+            return queryRunner.update(sql, id);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return 0;
+    }
+
+    public List<Computer> getAllComputer() throws SQLException {
+        String sql = "select * from computer";
+        return queryRunner.query(sql,new BeanListHandler<>(Computer.class));
+    }
+
+
+
+
+
+
+
+}

src/main/java/example/model/Computer.java

@@ -0,0 +1,50 @@
+package example.model;
+
+public class Computer {
+    private int id;
+    private String name;
+    private Double price;
+    private int stock;
+
+    public Computer() {
+    }
+
+    public Computer(int id, String name, Double price, int stock) {
+        this.id = id;
+        this.name = name;
+        this.price = price;
+        this.stock = stock;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Double getPrice() {
+        return price;
+    }
+
+    public void setPrice(Double price) {
+        this.price = price;
+    }
+
+    public int getStock() {
+        return stock;
+    }
+
+    public void setStock(int stock) {
+        this.stock = stock;
+    }
+}

src/main/java/example/service/IComputerService.java

@@ -0,0 +1,13 @@
+package example.service;
+
+import example.model.Computer;
+
+import java.sql.SQLException;
+import java.util.List;
+
+public interface IComputerService {
+    
+    public void addComputer(String name, String brand, String type, String price);
+
+    List<Computer> listComputer() throws SQLException;
+}

src/main/java/example/service/impl/ComputerServiceImpl.java

@@ -0,0 +1,23 @@
+package example.service.impl;
+
+import example.dao.ComputerDao;
+import example.model.Computer;
+import example.service.IComputerService;
+
+import java.sql.SQLException;
+import java.util.List;
+
+public class ComputerServiceImpl implements IComputerService {
+
+    ComputerDao computerDao=new ComputerDao();
+
+    @Override
+    public void addComputer(String name, String brand, String type, String price) {
+
+    }
+
+    @Override
+    public List<Computer> listComputer() throws SQLException {
+        return computerDao.getAllComputer();
+    }
+}

src/main/webapp/computerList.jsp

@@ -0,0 +1,40 @@
+<%@ page contentType="text/html; charset=UTF-8" language="java" %>
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Computer List</title>
+</head>
+<body>
+    <h1>Computer List</h1>
+    <table border="1">
+        <thead>
+            <tr>
+                <th>ID</th>
+                <th>Name</th>
+                <th>Price</th>
+                <th>Stock</th>
+                <th>Actions</th>
+            </tr>
+        </thead>
+        <tbody>
+            <c:forEach var="computer" items="${computers}">
+                <tr>
+                    <td>${computer.id}</td>
+                    <td>${computer.name}</td>
+                    <td>${computer.price}</td>
+                    <td>${computer.stock}</td>
+                    <td>
+                        <a href="/computer?action=updateForm&id=${computer.id}">Edit</a> |
+                        <a href="/computer?action=delete&id=${computer.id}">Delete</a>
+                    </td>
+                </tr>
+            </c:forEach>
+        </tbody>
+    </table>
+    <br/>
+    <a href="/computer?action=addForm">Add New Computer</a>
+</body>
+</html>

src/main/webapp/index.jsp

@@ -6,5 +6,6 @@
 <h2>电脑商城-首页</h2>
 <a href="/register">注册</a>
 <a href="/login">登录</a>
+<a href="/computerList">电脑列表</a>
 </body>
 </html>