核心代碼 web ~~~ //刪除 public void deleteCategory(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { // 1 調用service中的查詢方法 Map<String, String[]> parameterMap = request.getParameterMap(); Category category=new Category(); BeanUtils.populate(category,parameterMap); CategoryService service=new CategoryService(); boolean updateCategory = service.deleteCategory(category); if (updateCategory){ // 刪除成功后重定向到生鮮列表界面 response.sendRedirect(request.getContextPath()+"/category?method=queryCategoryList&currentPage=1&currentCount=5"); }else { // 失敗了直接提示 response.setContentType("text/html;charset=utf-8"); response.getWriter().write("刪除失敗"); } } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } } ~~~ service ~~~ //刪除 public boolean deleteCategory(Category category) throws SQLException { CategoryDao dao=new CategoryDao(); boolean updateCategory = dao.deleteCategory(category); return updateCategory; } ~~~ dao ~~~ //刪除 public boolean deleteCategory(Category category) throws SQLException { ComboPooledDataSource dataSource=new ComboPooledDataSource(); QueryRunner queryRunner=new QueryRunner(dataSource); String sql="delete from category where c_id=?"; int row = queryRunner.update(sql,category.getC_id()); return row>0?true:false; } ~~~ UserServlet.java ~~~ //登錄成功跳轉生鮮種類列表界面 response.sendRedirect(request.getContextPath()+"/category?method=queryCategoryList"); ~~~ 前端 ~~~ <td> <a href="${pageContext.request.contextPath}/category?method=deleteCategory&c_id=${category.c_id}">刪除</a> <a href="${pageContext.request.contextPath}/category-update.jsp?c_id=${category.c_id}&c_name=${category.c_name}&type=${category.type}&place=${category.place}">修改</a> </td> ~~~