📄 shopping_cart_doc_2.txt
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------------------------------学会创建动态的Action Form和使用DispatchAction1.创建index.jsp 在cart(web应用名)-->Root directory右键，new->jsp,在出现的界面中输入： name:index 然后[next]->[next]->[next]->finish------------------------index.jsp------------------------------------<%@ page contentType="text/html; charset=GBK" %><%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %><html><head><title>index</title></head><body bgcolor="#ffffff"><h1 align="center">本系统的所有商品列表如下：<br><br><table width="300" border="1"><tr height="25"><td>产品名称</td><td>添加到购物车</td></tr><c:forEach var="product" items="${allProduct}"><tr><td><c:out value="${product.value.name}"/></td><td><a href="/cart/cart.do?method=add&productId=<c:out value="${product.value.id}"/>">添加到购物车</td></tr></c:forEach></table><br><a href="cart.jsp">查看购物车</a></h1></body></html>编译，运行，测试2.创建cart.jsp源文件如下：--------------------------------------cart.jsp------------------------------------------------------<%@ page contentType="text/html; charset=GBK" %><%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %><%@ taglib uri="WEB-INF/struts-html.tld" prefix="html"%><html><head><title>我的购物车</title><script language="javascript" type="text/javascript"> function deleteCartItem(formname){ formname.action = "/cart/cart.do?method=delete"; formname.submit(); } function modifyNumber(formname){ formname.action = "/cart/cart.do?method=modify"; formname.submit(); }</script></head><body bgcolor="#ffffff"><h1 align="center"> 购物车 </h1><html:form action="/cart.do?method=clear" > <table width="75%" border="1" align="center" cellpadding="0" cellspacing="0"> <tr align="center"> <td width="7%">选择</td> <td width="21%" height="30">商品名称</td> <td width="14%" height="30">单价</td> <td width="25%" height="30">数量</td> <td width="33%" height="30">合计</td> </tr> <c:forEach var="cartItem" items="${cart.cartItem}"> <tr align="center"> <td height="30"> <input type="checkbox" name="item" value='<c:out value="${cartItem.key}"/>'> </td> <td height="30"><c:out value="${cartItem.value.product.name}"/></td> <td height="30"><c:out value="${cartItem.value.product.price}"/></td> <td height="30"><input type="text" name="number" value='<c:out value="${cartItem.value.number}"/>' maxlength="10" size="10"></td> <td height="30"><c:out value="${cartItem.value.cost}"/></td> </tr> </c:forEach> <tr> <td height="30" colspan="5">您的购物车中所有商品总金额：<c:out value="${cart.cost}"/></td> </tr></table> <br><br> <table width="450" border="0" align="center" cellpadding="0" cellspacing="0"> <tr align="center"> <td width="22%"> <html:button property="modify" value="修改数量" onclick="modifyNumber(this.form)"/></td> <td width="20%"><html:button property="delete" value="删除所选项" onclick="deleteCartItem(this.form)"/></td> <td width="26%"><html:submit value="清空购物车"/></td> <td width="20%"><html:button value="继续购物" property="continue" onclick="javascript:location.href='index.jsp'"/></td> </tr> </table> <p align="center"> </p></html:form></body></html>3.创建动态的ActionForm 双击界面左上方的<cart>(web应用名)--〉<struts1.1>-->struts-config.xml文件， 这时在界面的左下方出现的框中点开Form Beans选项， 在右边的界面中点[Add],输入ActionForm的名称：cartActionForm， 然后再看左下方的界面中Form Beans下边出现了一个cartActionForm,双击它，在右边的界面中进行如下配置： Name : cartActionForm Implementation class : org.apache.struts.action.DynaActionForm is dynabean : true(Jbuilder2005没有这个选项) 在Form Properties框中点击[Add]添加属性： name:productId type:java.lang.String name:item type:java.lang.String[] name:number type:java.lang.Integer[]4.创建CartAction.java 选择file->new->web->action，在出现的界面中输入如下： WebApp : cart struts config : WEB-INF/struts-config.xml package : cart.action Action : CartAction注意：**** Base class : org.apache.struts.actions.DispatchAction 点击[next]，在出现的界面中输入： Action path : /cart FormBean name : cartActionForm Scope : request Validate FormBean : false input JSP : /cart.jsp然后[finish]修改struts-config.xml文件双击界面左上方的<cart>(web应用名)--〉<struts1.1>-->struts-config.xml文件，这时在界面的左下方出现的框中点开Action Mappings选项，看到下面包含一个/cart,双击它，在界面的右方出现/cart的配置界面，在此界面中找到Parameter一项，在其后的文本框中输入method，在界面下方的几个标签中选择《forwards》,点击[Add], path : /cart.jsp name : cartIndex 然后保存。5.打开CartAction.java 选择perform方法的所有代码，将其删除，拷贝如下代码放入CartAction.java中。 public ActionForward clear(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) { HttpSession session = httpServletRequest.getSession(); Cart cart = new Cart(); session.removeAttribute("cart"); session.setAttribute("cart", cart); return actionMapping.findForward("cartIndex"); } public ActionForward delete(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) { DynaActionForm cartActionForm = (DynaActionForm) actionForm; String[] item = (String[])cartActionForm.get("item"); if (item != null) { Integer[] itemPid = new Integer[item.length]; for (int i = 0; i < itemPid.length; i++) { itemPid[i] = new Integer(item[i]); } HttpSession session = httpServletRequest.getSession(); Cart cart = (Cart) session.getAttribute("cart"); cart.deleteItemsByProductId(itemPid); session.removeAttribute("cart"); session.setAttribute("cart", cart); } return actionMapping.findForward("cartIndex"); } public ActionForward modify(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) { DynaActionForm cartActionForm = (DynaActionForm) actionForm; String[] item = (String[])cartActionForm.get("item"); Integer[] numbers = (Integer[])cartActionForm.get("number"); Integer productId = null; int number = 0; if (item != null) { HttpSession session = httpServletRequest.getSession(); Cart cart = (Cart) session.getAttribute("cart"); for (int i = 0; i < item.length; i++) { productId = new Integer(item[i]); number = numbers[i].intValue(); cart.modifyNumberByProductId(productId, number); } session.removeAttribute("cart"); session.setAttribute("cart", cart); } return actionMapping.findForward("cartIndex"); } public ActionForward add(ActionMapping actionMapping, ActionForm actionForm, HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) { System.out.println("in add"); DynaActionForm cartActionForm = (DynaActionForm) actionForm; Integer productId = new Integer((String)cartActionForm.get("productId")); ServletContext sc = httpServletRequest.getSession().getServletContext(); Product product = (Product) ( (HashMap) sc.getAttribute("allProduct")).get(productId); HttpSession session = httpServletRequest.getSession(); Cart cart = (Cart) session.getAttribute("cart"); cart.addItem(product, 1); session.removeAttribute("cart"); session.setAttribute("cart", cart); return actionMapping.findForward("cartIndex"); }⌨️ 快捷键说明
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