add<电脑删除>

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"})
+@WebServlet(urlPatterns = {"/computerList","/deleteComputer"})
 public class ComputerServlet extends HttpServlet {
 
     IComputerService computerService = new ComputerServiceImpl();
@@ -29,6 +29,19 @@ public class ComputerServlet extends HttpServlet {
                     throw new RuntimeException(e);
                 }
                 break;
+            case "/deleteComputer":
+                deleteComputer(req, resp);
+                break;
+        }
+    }
+
+    private void deleteComputer(HttpServletRequest req, HttpServletResponse resp) {
+        String id = req.getParameter("id");
+        try {
+            computerService.deleteComputer(id);
+            resp.sendRedirect("/computerList");
+        } catch (IOException e) {
+            throw new RuntimeException(e);
         }
     }
 

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

@@ -31,14 +31,13 @@ public class ComputerDao {
         return 0;
     }
 
-    public int deleteComputer(int id) {
+    public void deleteComputer(int id) {
         String sql = "delete from computer where id=?";
         try {
-            return queryRunner.update(sql, id);
+            queryRunner.update(sql, id);
         } catch (Exception e) {
             e.printStackTrace();
         }
-        return 0;
     }
 
     public List<Computer> getAllComputer() throws SQLException {

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

@@ -10,4 +10,6 @@ public interface IComputerService {
     public void addComputer(String name, String brand, String type, String price);
 
     List<Computer> listComputer() throws SQLException;
+
+    void deleteComputer(String id);
 }

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

@@ -20,4 +20,9 @@ public class ComputerServiceImpl implements IComputerService {
     public List<Computer> listComputer() throws SQLException {
         return computerDao.getAllComputer();
     }
+
+    @Override
+    public void deleteComputer(String id) {
+        computerDao.deleteComputer(Integer.parseInt(id));
+    }
 }

src/main/webapp/computerList.jsp

@@ -28,7 +28,7 @@
                     <td>${computer.stock}</td>
                     <td>
                         <a href="/computer?action=updateForm&id=${computer.id}">Edit</a> |
-                        <a href="/computer?action=delete&id=${computer.id}">Delete</a>
+                        <a href="/deleteComputer?id=${computer.id}">Delete</a>
                     </td>
                 </tr>
             </c:forEach>