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在JavaScript中想要调用Java的方法，通过JavaScript访问servlet，再通过servlet调用Java某个类的方法。
HTML代码
图片
名称
价格
款式
">
" alt="">
"><%=shoes.getBrand() %>/<%=shoes.getSeries() %>/<%=shoes.getName() %>
<%=shoes.getPrice() %>
<%=shoes.getSex() %>/<%=shoes.getSize() %>
ShopShoesDao.java
public void deleteFromCart(String shoes_id) {
System.out.println("ShopShoesDao.deleteFromCart");
String[] shoes_ids = shoes_id.split(",");
Connection connection = DBUtil.getConnection();
PreparedStatement preparedStatement = null;
try { for (String string : shoes_ids) { int id = Integer.parseInt(string);
String sql = "delete from user_product_cart where shoes_id = ?";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setInt(1, id);
preparedStatement.executeUpdate();
}
} catch (SQLException e) { // TODO Auto-generated catch block
e.printStackTrace();
}finally {
DBUtil.close(preparedStatement);
DBUtil.close(connection);
}
}ShopServlet.java
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub
System.out.println("service");
request.setCharacterEncoding("UTF-8");
String method=request.getParameter("method");
System.out.println(method); if(method.equals("addProduct")) {
addProduct(request,response);
}else if(method.equals("getShopsShoesImage")) { try {
getShopsShoesImage(request,response);
} catch (SQLException e) { // TODO Auto-generated catch block
e.printStackTrace();
}
}else if(method.equals("addToCart")) { try {
addToCart(request, response);
} catch (SQLException e) { // TODO Auto-generated catch block
e.printStackTrace();
}
}else if(method.equals("deleteFromCart")) { try {
deleteFromCart(request, response);
} catch (SQLException e) { // TODO Auto-generated catch block
e.printStackTrace();
}
}else if(method.equals("payFromCart")) { try {
payFromCart(request, response);
} catch (SQLException e) { // TODO Auto-generated catch block
e.printStackTrace();
}
}
}private void deleteFromCart(HttpServletRequest request, HttpServletResponse response) throws IOException, SQLException { // TODO Auto-generated method stub
System.out.println("deleteFromCart");
request.setCharacterEncoding("UTF-8"); int user_id= Integer.parseInt(request.getParameter("user_id"));
System.out.println(user_id);
String shoes_id = request.getParameter("shoes_id");
System.out.println(shoes_id);
ShopShoesDao shopShoesDao = new ShopShoesDao();
shopShoesDao.deleteFromCart(shoes_id);
request.getSession().setAttribute("shoes_id", shoes_id);
response.sendRedirect(request.getContextPath()+"/cart.jsp");
}javascrip代码
// 点击全部删除
deleteAll.onclick = function () { if (selectedTotal.innerHTML != 0) { var con = confirm('确定删除所选商品吗？'); //弹出确认框
if (con) { var shoes_id = ''; for (var i = 0; i < tr.length; i++) { // 如果被选中，就删除相应的行
if (tr[i].getElementsByTagName('input')[0].checked) {
shoes_id = shoes_id + tr[i].cells[0].innerHTML + ',';
//tr[i].parentNode.removeChild(tr[i]); // 删除相应节点
//i--; //回退下标位置
}
}
alert(shoes_id); window.location.href="ShopServlet?method=deleteFromCart&shoes_id="+shoes_id+"&user_id="+22;
alert("删除成功！");
}
} else {
alert('请选择商品！');
}
getTotal(); //更新总数
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