{"id":2739,"date":"2022-12-20T19:40:30","date_gmt":"2022-12-20T11:40:30","guid":{"rendered":"https:\/\/qaqaq.top\/?p=2739"},"modified":"2022-12-20T19:40:31","modified_gmt":"2022-12-20T11:40:31","slug":"%e4%b9%a6%e5%9f%8e%e9%a1%b9%e7%9b%ae-%e7%ac%ac%e4%b9%9d%e9%98%b6%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=2739","title":{"rendered":"\u4e66\u57ce\u9879\u76ee-\u7b2c\u4e5d\u9636\u6bb5"},"content":{"rendered":"\n<p>\u4e66\u57ce\u9879\u76ee-\u4f7f\u7528AJAX\u8bf7\u6c42\u9a8c\u8bc1\u7528\u6237\u540d\u662f\u5426\u53ef\u7528\u3001\u4e66\u57ce\u9879\u76ee-\u4f7f\u7528AJAX\u8bf7\u6c42\u4fee\u6539\u6dfb\u52a0\u5546\u54c1\u5230\u8d2d\u7269\u8f66\u7684\u5b9e\u73b0<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.1\u3001\u4f7f\u7528 AJAX \u9a8c\u8bc1\u7528\u6237\u540d\u662f\u5426\u53ef\u7528<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-290-1024x236.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"236\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-290-1024x236.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2740\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>UserServlet \u7a0b\u5e8f\u4e2d ajaxExistsUsername \u65b9\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>    protected void ajaxExistsUsername(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {\r\n        \/\/ \u83b7\u53d6\u8bf7\u6c42\u7684\u53c2\u6570username\r\n        String username = req.getParameter(\"username\");\r\n        \/\/ \u8c03\u7528userService.existsUsername();\r\n        boolean existsUsername = userService.existsUsername(username);\r\n        \/\/ \u628a\u8fd4\u56de\u7684\u7ed3\u679c\u5c01\u88c5\u6210\u4e3amap\u5bf9\u8c61\r\n        Map&lt;String,Object> resultMap = new HashMap&lt;>();\r\n        resultMap.put(\"existsUsername\",existsUsername);\r\n\r\n        Gson gson = new Gson();\r\n        String json = gson.toJson(resultMap);\r\n\r\n        resp.getWriter().write(json);\r\n\r\n    }<\/code><\/pre>\n\n\n\n<p>regist.jsp \u9875\u9762\u4e2d\u7684\u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$(\"#username\").blur(function () {\r\n\r\n\t\t\t\t\/\/ 1. \u83b7\u53d6\u7528\u6237\u540d\r\n\t\t\t\tvar username = this.value;\r\n\r\n\t\t\t\t$.getJSON(\"http:\/\/localhost:8080\/JavaWeb_Code_Book\/userServlet\",\r\n\t\t\t\t\t\t\"action=ajaxExistsUsername&amp;username=\" + username,\r\n\t\t\t\t\t\tfunction (data) {\r\n\t\t\t\t\t\t\t\/\/console.log(data)\r\n\t\t\t\t\t\t\tif (data.existsUsername){\r\n\t\t\t\t\t\t\t\t$(\"span.errorMsg\").text(\"\u7528\u6237\u540d\u5df2\u5b58\u5728\uff01\");\r\n\t\t\t\t\t\t\t} else {\r\n\t\t\t\t\t\t\t\t$(\"span.errorMsg\").text(\"\u7528\u6237\u540d\u53ef\u7528\uff01\");\r\n\t\t\t\t\t\t\t}\r\n\t\t\t\t\t\t})\r\n\r\n\t\t\t})\r\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.2\u3001\u4f7f\u7528 AJAX \u4fee\u6539\u628a\u5546\u54c1\u6dfb\u52a0\u5230\u8d2d\u7269\u8f66<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-291-1024x415.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"415\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-291-1024x415.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2741\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>CartServlet \u7a0b\u5e8f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\r\n     * \u52a0\u5165\u8d2d\u7269\u8f66\r\n     * @param req\r\n     * @param resp\r\n     * @throws ServletException\r\n     * @throws IOException\r\n     *\/\r\n    protected void ajaxAddItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {\r\n\r\n\/\/        System.out.println(\"\u52a0\u5165\u8d2d\u7269\u8f66\");\r\n\/\/        System.out.println(\"\u5546\u54c1\u7f16\u53f7\uff1a\" + req.getParameter(\"id\"));\r\n\r\n        \/\/ \u83b7\u53d6\u8bf7\u6c42\u7684\u53c2\u6570 \u5546\u54c1\u7f16\u53f7\r\n        int id = WebUtils.parseInt(req.getParameter(\"id\"),0);\r\n        \/\/ \u8c03\u7528bookService.queryBookById(id):Book\u5f97\u5230\u56fe\u4e66\u7684\u4fe1\u606f\r\n        Book book = bookService.queryBookById(id);\r\n        \/\/ \u628a\u56fe\u4e66\u4fe1\u606f\uff0c\u8f6c\u6362\u6210\u4e3aCartItem\u5546\u54c1\u9879\r\n        CartItem cartItem = new CartItem(book.getId(),book.getName(),1,book.getPrice(),book.getPrice());\r\n        \/\/ \u8c03\u7528Cart.addItem(CartItem);\u6dfb\u52a0\u5546\u54c1\u9879\r\n        Cart cart = (Cart) req.getSession().getAttribute(\"cart\");\r\n        if (cart == null) {\r\n            cart = new Cart();\r\n            req.getSession().setAttribute(\"cart\",cart);\r\n        }\r\n        cart.addItem(cartItem);\r\n\r\n        System.out.println(cart);\r\n\r\n        \/\/ \u6700\u540e\u4e00\u4e2a\u6dfb\u52a0\u7684\u5546\u54c1\u540d\u79f0\r\n        req.getSession().setAttribute(\"lastName\", cartItem.getName());\r\n\r\n        \/\/ 6. \u8fd4\u56de\u8d2d\u7269\u8f66\u603b\u7684\u5546\u54c1\u6570\u91cf\u548c\u6700\u540e\u4e00\u4e2a\u6dfb\u52a0\u7684\u5546\u54c1\u540d\u79f0\r\n        Map&lt;String, Object> resultMap = new HashMap&lt;String,Object>();\r\n\r\n        resultMap.put(\"totalCount\",cart.getTotalCount());\r\n        resultMap.put(\"lastName\",cartItem.getName());\r\n\r\n        Gson gson = new Gson();\r\n        String resultMapJsonString = gson.toJson(resultMap);\r\n\r\n        resp.getWriter().write(resultMapJsonString);\r\n\r\n    }<\/code><\/pre>\n\n\n\n<p>pages\/client\/index.jsp \u9875\u9762<\/p>\n\n\n\n<p>html \u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\t\t\t&lt;div style=\"text-align: center\">\r\n\t\t\t\t&lt;c:if test=\"${empty sessionScope.cart.items}\">\r\n\t\t\t\t\t&lt;%-- \u8d2d\u7269\u8f66\u4e3a\u7a7a\u7684\u8f93\u51fa --%>\r\n\t\t\t\t\t&lt;span id=\"cartTotalCount\">&lt;\/span>\r\n\t\t\t\t\t&lt;div>\r\n\t\t\t\t\t\t&lt;span style=\"color: red\" id=\"cartLastName\">\u5f53\u524d\u8d2d\u7269\u8f66\u4e3a\u7a7a&lt;\/span>\r\n\t\t\t\t\t&lt;\/div>\r\n\t\t\t\t&lt;\/c:if>\r\n\t\t\t\t&lt;c:if test=\"${not empty sessionScope.cart.items}\">\r\n\t\t\t\t\t&lt;%-- \u8d2d\u7269\u8f66\u975e\u7a7a\u7684\u8f93\u51fa --%>\r\n\t\t\t\t\t&lt;span id=\"cartTotalCount\">\u60a8\u7684\u8d2d\u7269\u8f66\u4e2d\u6709${sessionScope.cart.totalCount}\u4ef6\u5546\u54c1&lt;\/span>\r\n\t\t\t\t\t&lt;div>\r\n\t\t\t\t\t\t\u60a8\u521a\u521a\u5c06&lt;span style=\"color: red\" id=\"cartLastName\">${sessionScope.lastName}&lt;\/span>\u52a0\u5165\u5230\u4e86\u8d2d\u7269\u8f66\u4e2d\r\n\t\t\t\t\t&lt;\/div>\r\n\t\t\t\t&lt;\/c:if>\r\n\r\n\t\t\t&lt;\/div><\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-292-1024x347.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"347\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/12\/image-292-1024x347.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2742\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>javaScript \u4ee3\u7801\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script type=\"text\/javascript\">\r\n\t\t$(function () {\r\n\t\t\t\/\/ \u7ed9\u52a0\u5165\u8d2d\u7269\u8f66\u6309\u94ae\u7ed1\u5b9a\u5355\u51fb\u4e8b\u4ef6\r\n\t\t\t$(\"button.addToCart\").click(function () {\r\n\t\t\t\t\/**\r\n\t\t\t\t * \u5728\u4e8b\u4ef6\u54cd\u5e94\u7684function\u51fd\u6570 \u4e2d\uff0c\u6709\u4e00\u4e2athis\u5bf9\u8c61\uff0c\u8fd9\u4e2athis\u5bf9\u8c61\uff0c\u662f\u5f53\u524d\u6b63\u5728\u54cd\u5e94\u4e8b\u4ef6\u7684dom\u5bf9\u8c61\r\n\t\t\t\t * @type {*|jQuery}\r\n\t\t\t\t *\/\r\n\t\t\t\tvar bookId = $(this).attr(\"bookId\");\r\n\t\t\t\t\/\/location.href = \"http:\/\/localhost:8080\/JavaWeb_Code_Book\/cartServlet?action=addItem&amp;id=\" + bookId;\r\n\r\n\t\t\t\t\/\/ \u53d1ajax\u8bf7\u6c42\uff0c \u6dfb\u52a0\u5546\u54c1\u5230\u8d2d\u7269\u8f66\r\n\t\t\t\t$.getJSON(\"http:\/\/localhost:8080\/JavaWeb_Code_Book\/cartServlet\",\r\n\t\t\t\t\t\t\"action=ajaxAddItem&amp;id=\" + bookId,\r\n\t\t\t\t\t\tfunction (data) {\r\n\t\t\t\t\t\t\t\/\/console.log(data);\r\n\t\t\t\t\t\t\t$(\"#cartTotalCount\").text(\"\u60a8\u7684\u8d2d\u7269\u8f66\u4e2d\u6709\" + data.totalCount + \"\u4ef6\u5546\u54c1\");\r\n\t\t\t\t\t\t\t$(\"#cartLastName\").text(data.lastName);\r\n\r\n\t\t\t\t\t\t})\r\n\t\t\t})\r\n\t\t})\r\n\t&lt;\/script><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e66\u57ce\u9879\u76ee-\u4f7f\u7528AJAX\u8bf7\u6c42\u9a8c\u8bc1\u7528\u6237\u540d\u662f\u5426\u53ef\u7528\u3001\u4e66\u57ce\u9879\u76ee-\u4f7f\u7528AJAX\u8bf7\u6c42\u4fee\u6539\u6dfb\u52a0\u5546\u54c1\u5230\u8d2d\u7269\u8f66\u7684\u5b9e\u73b0 3.1\u3001\u4f7f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[59],"tags":[61],"class_list":["post-2739","post","type-post","status-publish","format-standard","hentry","category-javaweb-code","tag-javaweb"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2739"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2739"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2739\/revisions"}],"predecessor-version":[{"id":2743,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/2739\/revisions\/2743"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}