JavaScript如何调用Java的方法

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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

    
        
            
                
                      全选                
                
            
            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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