add<电脑编辑>

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

@@ -13,7 +13,7 @@ import java.io.IOException;
 import java.sql.SQLException;
 import java.util.List;
 
-@WebServlet(urlPatterns = {"/computerList","/deleteComputer","/addComputer"})
+@WebServlet(urlPatterns = {"/computerList","/deleteComputer","/addComputer","/editComputer"})
 public class ComputerServlet extends HttpServlet {
 
     IComputerService computerService = new ComputerServiceImpl();
@@ -35,9 +35,19 @@ public class ComputerServlet extends HttpServlet {
             case "/addComputer":
                 addComputer(req, resp);
                 break;
+            case "/editComputer":
+                editComputer(req, resp);
+                break;
         }
     }
 
+    private void editComputer(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        String id = req.getParameter("id");
+        Computer computer = computerService.getComputer(id);
+        req.setAttribute("computer", computer);
+        req.getRequestDispatcher("editComputer.jsp").forward(req, resp);
+    }
+
     private void addComputer(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         req.getRequestDispatcher("addComputer.jsp").forward(req, resp);
     }
@@ -60,6 +70,31 @@ public class ComputerServlet extends HttpServlet {
 
     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        String path = req.getServletPath();
+        switch (path) {
+            case "/addComputer":
+                savaComputer(req, resp);
+                break;
+            case "/editComputer":
+                UpdatComputer(req, resp);
+                break;
+        }
+    }
+
+    private void UpdatComputer(HttpServletRequest req, HttpServletResponse resp) {
+        String id = req.getParameter("id");
+        String name = req.getParameter("name");
+        String price = req.getParameter("price");
+        String stock = req.getParameter("stock");
+        computerService.updateComputer(id,name,Double.parseDouble(price),Integer.parseInt(stock));
+        try {
+            resp.sendRedirect("/computerList");
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    void savaComputer(HttpServletRequest req, HttpServletResponse resp) throws IOException {
         String name = req.getParameter("name");
         String price = req.getParameter("price");
         String stock = req.getParameter("stock");

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

@@ -3,6 +3,7 @@ package example.dao;
 import example.model.Computer;
 import example.utils.DBUtils;
 import org.apache.commons.dbutils.QueryRunner;
+import org.apache.commons.dbutils.handlers.BeanHandler;
 import org.apache.commons.dbutils.handlers.BeanListHandler;
 
 import java.sql.SQLException;
@@ -46,9 +47,13 @@ public class ComputerDao {
     }
 
 
-
-
-
-
-
+    public Computer getComputerById(int i) {
+        String sql = "select * from computer where id=?";
+        try {
+            return queryRunner.query(sql, new BeanHandler<>(Computer.class), i);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
 }

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

@@ -12,4 +12,8 @@ public interface IComputerService {
     List<Computer> listComputer() throws SQLException;
 
     void deleteComputer(String id);
+
+    Computer getComputer(String id);
+
+    void updateComputer(String id, String name, double v, int i);
 }

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

@@ -26,4 +26,14 @@ public class ComputerServiceImpl implements IComputerService {
     public void deleteComputer(String id) {
         computerDao.deleteComputer(Integer.parseInt(id));
     }
+
+    @Override
+    public Computer getComputer(String id) {
+        return computerDao.getComputerById(Integer.parseInt(id));
+    }
+
+    @Override
+    public void updateComputer(String id, String name, double v, int i) {
+        computerDao.updateComputer(name, v, i, Integer.parseInt(id));
+    }
 }

src/main/webapp/computerList.jsp

@@ -27,7 +27,7 @@
                     <td>${computer.price}</td>
                     <td>${computer.stock}</td>
                     <td>
-                        <a href="/computer?action=updateForm&id=${computer.id}">Edit</a> |
+                        <a href="/editComputer?id=${computer.id}">Edit</a> |
                         <a href="/deleteComputer?id=${computer.id}">Delete</a>
                     </td>
                 </tr>

src/main/webapp/editComputer.jsp

@@ -0,0 +1,25 @@
+<%@ page contentType="text/html; charset=UTF-8" language="java" %>
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Update Computer</title>
+</head>
+<body>
+    <h1>Update Computer</h1>
+    <form action="/editComputer" method="post">
+        <input type="hidden" name="id" value="${computer.id}">
+        <label for="name">Name: </label><br>
+        <input type="text" id="name" name="name" value="${computer.name}"><br><br>
+        <label for="price">Price: </label><br>
+        <input type="text" id="price" name="price" value="${computer.price}"><br><br>
+        <label for="stock">Stock: </label><br>
+        <input type="text" id="stock" name="stock" value="${computer.stock}"><br><br>
+        <input type="submit" value="Update Computer">
+    </form>
+    <br>
+    <a href="/computerList">Back to List</a>
+</body>
+</html>