{"id":5317,"date":"2022-02-10T17:19:00","date_gmt":"2022-02-10T09:19:00","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5317"},"modified":"2022-02-10T17:19:00","modified_gmt":"2022-02-10T09:19:00","slug":"javawebservletjsp%e5%ae%9e%e7%8e%b0%e5%9f%ba%e4%ba%8e%e7%89%a9%e5%93%81%e7%9a%84%e5%8d%8f%e5%90%8c%e8%bf%87%e6%bb%a4%e7%ae%97%e6%b3%95itemcf%e7%9a%84%e6%8e%a8%e8%8d%90%e7%b3%bb%e7%bb%9f%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5317","title":{"rendered":"JavaWeb+Servlet+JSP\u5b9e\u73b0\u57fa\u4e8e\u7269\u54c1\u7684\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5(itemCF)\u7684\u63a8\u8350\u7cfb\u7edf\uff01"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">JavaWeb+Servlet+JSP\u5b9e\u73b0\u57fa\u4e8e\u7269\u54c1\u7684\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5(itemCF)\u7684\u63a8\u8350\u7cfb\u7edf\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u5929\u7ed9\u5927\u5bb6\u63a8\u8350\u4e00\u4e2a\u7b80\u5355\u7684 Java Web\u63a8\u8350\u7cfb\u7edf\uff0c\u4e3b\u8981\u7b97\u6cd5\u662f\u57fa\u4e8e\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5(itemCF)\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf0.jpg\" alt=\"\u57fa\u4e8e\u7269\u54c1\u7684\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5\uff08ItemCF\uff09\" \/><figcaption>\u57fa\u4e8e\u7269\u54c1\u7684\u534f\u540c\u8fc7\u6ee4\u7b97\u6cd5\uff08ItemCF\uff09<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">1\u3001 ItemCF\u7b97\u6cd5\u539f\u7406\uff1a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ItemCF\u7b97\u6cd5\u5e76\u4e0d\u5229\u7528\u7269\u54c1\u7684\u5185\u5bb9\u5c5e\u6027\u8ba1\u7b97\u7269\u54c1\u4e4b\u95f4\u7684\u76f8\u4f3c\u5ea6\uff0c\u5b83\u4e3b\u8981\u901a\u8fc7\u5206\u6790\u7528\u6237\u7684\u884c\u4e3a\u8bb0\u5f55\u8ba1\u7b97\u7269\u54c1\u4e4b\u95f4\u7684\u76f8\u4f3c\u5ea6\u3002\u8be5\u7b97\u6cd5\u8ba4\u4e3a\u4e00\u4e2a\u4eba\u7684\u5174\u8da3\u90fd\u5c40\u9650\u5728\u51e0\u4e2a\u65b9\u9762\uff0c\u5f53\u5f88\u591a\u4eba\u90fd\u5bf9\u4e24\u4e2a\u7269\u54c1\u611f\u5174\u8da3\u65f6\uff0c\u5c31\u8ba4\u4e3a\u8fd9\u4e24\u4e2a\u7269\u54c1\u5177\u6709\u8f83\u5927\u7684\u76f8\u4f3c\u5ea6\uff0c\u5373\u7269\u54c1A,B\u5177\u6709\u5f88\u5927\u7684\u76f8\u4f3c\u5ea6\u662f\u56e0\u4e3a\u559c\u6b22\u7269\u54c1A\u7684\u7528\u6237\u5927\u90fd\u4e5f\u559c\u6b22\u7269\u54c1B\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2\u3001 ItemCF\u7b97\u6cd5\u6b65\u9aa4\uff1a<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>\u8ba1\u7b97\u7269\u54c1\u4e4b\u95f4\u7684\u76f8\u4f3c\u5ea6<\/li><li>\u6839\u636e\u7269\u54c1\u7684\u76f8\u4f3c\u5ea6\u548c\u7528\u6237\u7684\u5386\u53f2\u884c\u4e3a\u7ed9\u7528\u6237\u751f\u6210\u63a8\u8350\u5217\u8868\u3002<\/li><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 \u7269\u54c1\u76f8\u4f3c\u5ea6\u8ba1\u7b97<\/h3>\n\n\n\n<ol class=\"wp-block-list\"><li>\u5efa\u7acb\u7528\u6237-\u7269\u54c1\u7684\u5012\u6392\u8868<\/li><li>\u5bf9\u4e8e\u6bcf\u4e2a\u7528\u6237\uff0c\u5c06\u7528\u6237\u5217\u8868\u4e2d\u7684\u7269\u54c1\u4e24\u4e24\u7ec4\u5408\uff0c\u5e76\u5728\u5171\u73b0\u77e9\u9635\u4e2d\u52a01<\/li><li>\u904d\u5386\u5171\u73b0\u77e9\u9635\uff0c\u8ba1\u7b97\u51fa\u7269\u54c1\u76f8\u4f3c\u5ea6\u77e9\u9635 W W W\uff0c\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff1a<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf1.jpg\" alt=\"\u7269\u54c1\u76f8\u4f3c\u5ea6\u8ba1\u7b97\" \/><figcaption>\u7269\u54c1\u76f8\u4f3c\u5ea6\u8ba1\u7b97<\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">2.2 \u751f\u6210\u63a8\u8350\u5217\u8868<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u5982\u4e0b\u516c\u5f0f\u8ba1\u7b97\u7528\u6237u\u5bf9\u4e00\u4e2a\u7269\u54c1j\u7684\u5174\u8da3 \uff1a<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf2.jpg\" alt=\"\u751f\u6210\u63a8\u8350\u5217\u8868\" \/><figcaption>\u751f\u6210\u63a8\u8350\u5217\u8868<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">3\u3001ItemCF\u7684\u4f18\u7f3a\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f18\u70b9\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>\u63a8\u8350\u7ed3\u679c\u4e2d\u957f\u5c3e\u7269\u54c1\u4e30\u5bcc\uff0c\u9002\u7528\u4e8e\u7528\u6237\u4e2a\u6027\u5316\u9700\u6c42\u5f3a\u70c8\u7684\u9886\u57df<\/li><li>\u53ef\u4ee5\u5229\u7528\u7528\u6237\u7684\u5386\u53f2\u884c\u4e3a\u7ed9\u63a8\u8350\u7ed3\u679c\u505a\u51fa\u89e3\u91ca<\/li><li>\u7528\u6237\u6709\u65b0\u884c\u4e3a\uff0c\u5c31\u4f1a\u5b9e\u65f6\u5bfc\u81f4\u63a8\u8350\u7ed3\u679c\u7684\u5b9e\u65f6\u53d8\u5316<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u7f3a\u70b9\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>\u9002\u7528\u4e8e\u7269\u54c1\u6570\u660e\u663e\u5c0f\u4e8e\u7528\u6237\u6570\u7684\u573a\u5408\uff1b\u5982\u679c\u7269\u54c1\u5f88\u591a\uff0c\u8ba1\u7b97\u7269\u54c1\u7684\u76f8\u4f3c\u5ea6\u77e9\u9635\u4ee3\u4ef7\u5f88\u5927<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">4\u3001\u4f18\u5316\u70b9<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>\u76f8\u4f3c\u5ea6\u77e9\u9635\u7684\u8ba1\u7b97\u4e2d\u5f15\u5165\u5bf9\u6d3b\u8dc3\u7528\u6237\u7684\u60e9\u7f5a\uff08\u6d3b\u8dc3\u7528\u6237\u5bf9\u7269\u54c1\u76f8\u4f3c\u5ea6\u7684\u8d21\u732e\u5e94\u8be5\u5c0f\u4e8e\u4e0d\u6d3b\u8dc3\u7684\u7528\u6237 \uff09\uff0c\u589e\u52a0IUF\u53c2\u6570\u6765\u4fee\u6b63\u7269\u54c1\u76f8\u4f3c\u5ea6\u7684\u8ba1\u7b97\u516c\u5f0f<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf3.jpg\" alt=\"\u4fee\u6b63\u7269\u54c1\u76f8\u4f3c\u5ea6\u7684\u8ba1\u7b97\u516c\u5f0f\" \/><figcaption>\u4fee\u6b63\u7269\u54c1\u76f8\u4f3c\u5ea6\u7684\u8ba1\u7b97\u516c\u5f0f<\/figcaption><\/figure><\/div>\n\n\n\n<ol class=\"wp-block-list\"><li>\u5bf9\u4e8e\u8fc7\u4e8e\u6d3b\u8dc3\u7684\u7528\u6237\uff0c\u5f80\u5f80\u5ffd\u7565\u4ed6\u4eec\u7684\u5174\u8da3\u5217\u8868\u3002<\/li><li>\u5c06ItemCF\u7684\u76f8\u4f3c\u5ea6\u77e9\u9635\u6309\u6700\u5927\u503c\u5f52\u4e00\u5316\uff0c\u53ef\u4ee5\u63d0\u9ad8\u63a8\u8350\u7684\u51c6\u786e\u7387\u548c\u8986\u76d6\u7387<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf4.jpg\" alt=\"\u63d0\u9ad8\u63a8\u8350\u7684\u51c6\u786e\u7387\u548c\u8986\u76d6\u7387\" \/><figcaption>\u63d0\u9ad8\u63a8\u8350\u7684\u51c6\u786e\u7387\u548c\u8986\u76d6\u7387<\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b9e\u6218<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u9762\u4ee3\u7801\u4f7f\u7528\u4e86\u7535\u5f71\u8bc4\u5206\u6570\u636e\u96c6\uff0c\u8be5\u6570\u636e\u96c6\u53ef\u4ee5\u4ece<code>https:\/\/pan.baidu.com\/s\/1dEeF5dt6zRFpH1u7Rn6JLA<\/code>\u4e0b\u8f7d\uff08\u63d0\u53d6\u7801\uff1a7k1w \uff09\u3002\u6570\u636e\u4e2d\u5305\u542b\u4e86943\u4e2a\u7528\u6237\u5bf91682\u4e2a\u7535\u5f71\u768410W\u6761\u8bc4\u5206\u6570\u636e\uff0c\u6570\u636e\u5df2\u7ecf\u5904\u7406\u6210csv\u683c\u5f0f\uff0c\u53ef\u901a\u8fc7pandas.read_csv\u76f4\u63a5\u8bfb\u53d6\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf5.jpg\" alt=\"\u7535\u5f71\u8bc4\u5206\u6570\u636e\u96c6\" \/><figcaption>\u7535\u5f71\u8bc4\u5206\u6570\u636e\u96c6<\/figcaption><\/figure><\/div>\n\n\n\n<pre class=\"wp-block-code\"><code>import numpy as np\nimport pandas as pd\nfrom itertools import combinations, permutations\nfrom operator import itemgetter\n\ndef trans_df2dict(df):\n    \"\"\"\u5c06\u6570\u636e\u8f6c\u5316\u6210\u5b57\u5178\u683c\u5f0f\"\"\"\n    user_rating = dict()  # \u7528\u6237\u8bc4\u5206\u6570\u636e\n    for row in df.values:\n        uesr_id, movie_id, rating = row[0], row[1], row[2]\n        if uesr_id not in user_rating.keys():\n            user_rating[uesr_id] = {}\n        user_rating[uesr_id][movie_id] = rating\n    return user_rating\n\n\ndef get_items_similarity(df, item_num):\n    \"\"\"\u8ba1\u7b97items\u76f8\u4f3c\u6027\u77e9\u9635\uff0c\u8fd4\u56de\u76f8\u4f3c\u6027\u77e9\u9635\"\"\"\n    # 1. \u5efa\u7acb\u7528\u6237-\u7269\u54c1\u7684\u5012\u6392\u8868\n    inverted_table = df.groupby(by='userId')['moviesId'].agg(list).to_dict()\n\n    # 2. \u521d\u59cb\u5316\u5171\u73b0\u77e9\u9635\uff0c\u904d\u5386\u6bcf\u4e2a\u7528\u6237\uff0c\u5c06\u7269\u54c1\u4e24\u4e24\u7ec4\u5408\uff0c\u5e76\u5728\u5171\u73b0\u77e9\u9635\u4e2d\u52a01\n    W = np.zeros((item_num, item_num))\n\n    # \u7edf\u8ba1\u6bcf\u4e2a\u7535\u5f71\u88ab\u591a\u5c11\u4eba\u770b\u8fc7\n    count_item_users_num = df.groupby(by='moviesId')['userId'].agg('count').to_dict()\n\n    for key, val in inverted_table.items():\n        val.sort(reverse=True)  # \u964d\u5e8f\n        for per in combinations(val, 2):\n            W[per[0] - 1][per[1] - 1] += 1\n            W[per[1] - 1][per[0] - 1] += 1\n\n    # \u8ba1\u7b97\u76f8\u4f3c\u6027\n    for i in range(W.shape[0]):\n        for j in range(W.shape[1]):\n            W[i][j] \/= np.sqrt(count_item_users_num.get(i + 1) * count_item_users_num.get(j + 1))\n\n    w_dict = {}\n    for i in range(W.shape[0]):\n        tmp = []\n        for index, k in enumerate(W[i]):\n            tmp.append((index + 1, k))\n        w_dict[i + 1] = tmp\n    return w_dict\n\n\ndef user_interest_with_items(user_id, item_id, K, user_rating, w_dict):\n    \"\"\"\u8ba1\u7b97\u6307\u5b9a\u7528\u6237\u4e0e\u6307\u5b9a\u7269\u54c1\u7684\u5174\u8da3\u7a0b\u5ea6\"\"\"\n    interest = 0\n    for i in sorted(w_dict[item_id], key=itemgetter(1), reverse=True)[0:K]:\n        item_index = i[0]\n        item_simi = i[1]\n        if item_index in user_rating[user_id].keys():\n            interest += item_simi * user_rating[user_id][item_index]\n    return interest\n\n\ndef get_user_interest_list(user_id, K, user_rating, w_dict):\n    \"\"\"\u8ba1\u7b97\u7528\u6237\u7684\u5174\u8da3\u5217\u8868\"\"\"\n    rank = []\n    item_id_list = w_dict.keys()\n    for item_id in item_id_list:\n        if item_id in user_rating[user_id].keys():\n            continue\n        interest = user_interest_with_items(user_id, item_id, K, user_rating, w_dict)\n        rank.append((item_id, interest))\n    return sorted(rank, key=itemgetter(1), reverse=True)\n\n\nif  __name__ == '__main__':\n    df = pd.read_csv('.\/ml-100k.csv')\n    item_num = df.moviesId.nunique()\n    user_num = df.userId.nunique()\n    \n    user_rating = trans_df2dict(df)\n    \n    w_dict = get_items_similarity(df, item_num)\n    \n    recommend_list = get_user_interest_list(2, 20, user_rating, w_dict)\n    print(recommend_list[0:20])<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u51fa\u7684\u524d20\u4e2a\u63a8\u8350\u7684\u7535\u5f71ID:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/xmt1139057136\/xttblog\/2022\/02\/itemcf6.jpg\" alt=\"\u8f93\u51fa\u7684\u524d20\u4e2a\u63a8\u8350\u7684\u7535\u5f71ID\" \/><figcaption>\u8f93\u51fa\u7684\u524d20\u4e2a\u63a8\u8350\u7684\u7535\u5f71ID<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u57fa\u4e8e\u4e0a\u9762\u7684\u539f\u7406\u548c\u7406\u8bba\u4ee5\u53ca Python \u7684\u5b9e\u6218\u3002\u6211\u8fd9\u91cc\u53c8\u7528 Java \u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5355\u7684 Web\u63a8\u8350\u7cfb\u7edf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u9879\u76ee\u7684\u6570\u636e\u5b58\u50a8\u5728 MySQL \u4e2d\uff0c\u9879\u76ee\u6e90\u7801\u4e2d\u6574\u7406\u4e86 SQL \u6587\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9879\u76ee\u6574\u4f53\u7ed3\u6784\u5305\u62ec\uff1a\u767b\u5f55\u9875\u9762\u3001\u6ce8\u518c\u9875\u9762\u3001\u63a8\u8350\u5217\u8868\u7b49\u3002\u662f\u4e00\u4e2a\u7b80\u5355\u7684 idea + Tomcat \u7684\u4e0a\u624b\u9879\u76ee\uff0c\u6709\u9700\u8981\u7684\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1\uff1axttblog2\uff0c\u514d\u8d39\u9001\u7ed9\u5927\u5bb6\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img 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