JavaScript中如何调用Java方法

在JavaScript中想要调用Java的方法，我通过JavaScript访问servlet，再通过servlet调用Java某个类的方法。

HTML代码

<table id='cartTable'> <thead> <tr> <th class='product_remove'><label> <input type='checkbox'/> 全选</label><a href='javascript:;' rel='external nofollow' ><i class='fa fa-trash-o'></i></a> </th> <th class='product_thumb'>图片</th> <th class='product_name'>名称</th> <th class='product-price'>价格</th> <th class='product_quantity'>款式</th> </tr> </thead> <tbody> <tr> <td class='product_remove'><input type='checkbox'/> </td> <td class='product_thumb'><a href='https://www.haobala.com/bcjs/ShopShoesDetails.jsp?shoes_id=<%=shoes.getShoes_id() %>' rel='external nofollow' rel='external nofollow' > <img src='https://www.haobala.com/bcjs/${pageContext.request.contextPath}/ShopServlet?method=getShopsShoesImage&shoes_id=<%=shoes.getShoes_id() %>' alt=''></a> </td> <td class='product_name'><a href='https://www.haobala.com/bcjs/ShopShoesDetails.jsp?shoes_id=<%=shoes.getShoes_id() %>' rel='external nofollow' rel='external nofollow' ><%=shoes.getBrand() %>/<%=shoes.getSeries() %>/<%=shoes.getName() %></a> </td> <td class='product-price'><%=shoes.getPrice() %></td> <td class='product_quantity'><%=shoes.getSex() %>/<%=shoes.getSize() %></td> </tr> </tbody></table>

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 blocke.printStackTrace(); } }else if(method.equals('addToCart')) { try {addToCart(request, response); } catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace(); } }else if(method.equals('deleteFromCart')) { try {deleteFromCart(request, response); } catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace(); } }else if(method.equals('payFromCart')) { try {payFromCart(request, response); } catch (SQLException e) {// TODO Auto-generated catch blocke.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='https://www.haobala.com/bcjs/ShopServlet?method=deleteFromCart&shoes_id=' rel='external nofollow' +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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