{"id":22,"date":"2021-04-19T17:12:57","date_gmt":"2021-04-19T09:12:57","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/jsp\/?p=22"},"modified":"2021-04-19T17:12:59","modified_gmt":"2021-04-19T09:12:59","slug":"servlet%e7%9a%84ajax%e7%99%bb%e5%bd%95","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/jsp\/post-22.html","title":{"rendered":"servlet\u7684ajax\u767b\u5f55"},"content":{"rendered":"\n

\u5728\u4f7f\u7528servlet\u8fdb\u884c\u767b\u5f55\u6821\u9a8c\u65f6, \u5f80\u5f80\u67092\u6b21\u6821\u9a8c, \u5206\u522b\u662f\u524d\u7aef\u6821\u9a8c\u548c\u540e\u7aef\u6821\u9a8c<\/p>\n\n\n\n

\u5982\u679c\u7528\u6237\u672a\u586b\u5199\u8868\u5355, \u6216\u683c\u5f0f\u660e\u663e\u4e0d\u5bf9, \u90a3\u4e48\u4f7f\u7528js\u8fdb\u884c\u524d\u7aef\u6821\u9a8c, \u6ca1\u5fc5\u8981\u4f7f\u7528\u540e\u7aef\u6821\u9a8c, \u6bd5\u7adf\u592a\u6d6a\u8d39\u65f6\u95f4\u548c\u670d\u52a1\u6210\u672c\u4e86. \u5f53\u524d\u7aef\u6821\u9a8c\u5b8c\u6bd5\u540e, \u5c31\u9700\u8981\u628a\u6570\u636e\u4f20\u9012\u7ed9\u670d\u52a1\u5668\u8fdb\u884c\u6821\u9a8c, \u4ee5\u68c0\u9a8c\u7528\u6237\u8d26\u6237\u5bc6\u7801\u7684\u6b63\u786e\u6027.<\/p>\n\n\n\n

\u6b64\u65f6, \u5982\u679c\u6211\u4eec\u4f7f\u7528\u4e86form\u53d1\u9001action\u8bf7\u6c42, \u90a3\u4e48\u9875\u9762\u5c31\u4f1a\u8df3\u8f6c, \u4e00\u65e6\u7528\u6237\u540d\u548c\u5bc6\u7801\u4e0d\u5339\u914d, \u6211\u4eec\u518d\u8ba9\u7528\u6237\u9000\u56de\u767b\u5f55\u754c\u9762\u662f\u5f88\u4e0d\u53cb\u597d\u7684, \u6240\u4ee5\u6211\u4eec\u5e94\u8be5\u5c3d\u91cf\u4f7f\u7528ajax<\/p>\n\n\n\n

\u5927\u6982\u6d41\u7a0b\u56fe\u53ef\u4ee5\u5982\u4e0b\u8868\u793a : <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u524d\u7aef\u4ee3\u7801<\/h2>\n\n\n\n

\u5047\u8bbe\u524d\u7aef\u662f\u4e00\u4e2a\u5b66\u751f\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf, \u67093\u79cd\u7528\u6237, \u5206\u522b\u662f\u5b66\u751f, \u6559\u5e08, \u7ba1\u7406\u5458, \u6211\u4eec\u5199input\u505a\u8f93\u5165\u6846, \u5e76\u4e14\u5199\u4e00\u4e2aradio\u505a\u8eab\u4efd\u9009\u62e9, \u524d\u7aef\u4ee3\u7801\u4ec5\u4f9b\u53c2\u8003<\/p>\n\n\n\n

<!DOCTYPE html>\n<html>\n<head>\n    <title>\u5b66\u751f\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf<\/title>\n    <meta charset=\"utf-8\">\n    <style>\n        *{margin: 0px;padding: 0px;}\n        #header{font-size: 36px;}\n        #header, #myform{text-align: center;}\n        #myfooter{position: absolute;left: 40%;}\n        #header{margin-top:60px;}\n        #myform{margin-top: 120px;}\n        #myfooter{margin-top: 150px;}\n        input{margin-right: 10px;font-size: 22px;}\n    <\/style>\n    <link href=\"favicon.ico\" rel=\"shortcut icon\" type=\"image\/x-icon\">\n<\/head>\n<body>\n<h2 id=\"header\">\u6b22\u8fce\u4f7f\u7528\u5b66\u751f\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf!<\/h2>\n<div id=\"myform\">\n    <input id=\"username\" type=\"text\" placeholder=\"\u8d26\u53f7\" name=\"username\" onblur=\"return checkuser()\">\n    <input id=\"password\" type=\"password\" placeholder=\"\u5bc6\u7801\" name=\"password\" onblur=\"return checkpwd()\">\n    <input type=\"submit\" value=\"\u767b\u5f55\" onclick=\"checkAll()\">\n    <br><br>\n    <label for=\"student\">\u5b66\u751f<\/label><input type=\"radio\" id=\"student\" name=\"identity\" value=\"\u5b66\u751f\" checked=\"checked\">\n    <label for=\"teacher\">\u6559\u5e08<\/label><input type=\"radio\" id=\"teacher\" name=\"identity\" value=\"\u6559\u5e08\">\n    <label for=\"admin\">\u7ba1\u7406\u5458<\/label><input type=\"radio\" id=\"admin\" name=\"identity\" value=\"\u7ba1\u7406\u5458\">\n<\/div>\n\n<footer>\n    <div id=\"myfooter\">\n        <p><b>\u6e29\u99a8\u63d0\u793a:<\/b><\/p><br>\n        <ul>\n            <li>\u8bf7\u59a5\u5584\u4fdd\u7ba1\u60a8\u7684\u8d26\u53f7\u5bc6\u7801!<\/li>\n            <li>\u79bb\u5f00\u672c\u7cfb\u7edf\u65f6,\u8bf7\u522b\u5fd8\u8bb0\u9000\u51fa\u767b\u5f55.<\/li>\n        <\/ul>\n    <\/div>\n<\/footer>\n<script src=\"static\/js\/jquery-3.5.1.min.js\"><\/script>\n<script>\n    function checkuser() {   \/\/\u5224\u65ad\u7528\u6237\u540d\u662f\u5426\u4e3a\u7a7a\n        var user = $(\"#username\");\n        if(user.val()){\n            user.css(\"border\",\"\");\n            return true;\n        }else{\n            user.css(\"border\",\"1px solid red\");\n            return false;\n        }\n    }\n    function checkpwd() {    \/\/\u5224\u65ad\u5bc6\u7801\u662f\u5426\u4e3a\u7a7a\n        var pwd = $(\"#password\");\n        if (pwd.val()){\n            pwd.css(\"border\",\"\");\n            return true;\n        }else{\n            pwd.css(\"border\",\"1px solid red\");\n            return false;\n        }\n    }\n    $(document).keypress(function(e) {  \/\/\u7ed9\u767b\u5f55\u6309\u94ae\u7ed1\u5b9aenter\u5feb\u6377\u952e\n        var eCode = e.keyCode ? e.keyCode : e.which ? e.which : e.charCode;\n        if (eCode == 13){\n            \/\/ alert('\u60a8\u6309\u4e86\u56de\u8f66\u952e')\n            checkAll();\n        }\n    });\n    function checkAll() { \/\/\u8868\u5355\u6821\u9a8c, \u5224\u65ad\u7528\u6237\u540d\u548c\u5bc6\u7801\u662f\u5426\u4e3a\u7a7a\n\n        if (checkuser() && checkpwd()){\n            \/\/ alert(\"\u524d\u7aef\u6821\u9a8c\u901a\u8fc7\")\n            \/\/ajax\u5f02\u6b65\u8bf7\u6c42,\u7531\u670d\u52a1\u5668\u5224\u65ad\u7528\u6237\u540d\u5bc6\u7801\u662f\u5426\u914d\u5bf9\n            $.post(\"LoginServlet\",{username:$(\"#username\").val(),\n                    password:$(\"#password\").val(),identity:$('input[name=\"identity\"]:checked').val()},\n                function(msg){\n                    \/\/\u5237\u65b0\u9a8c\u8bc1\u7801\uff0c\u4e0b\u6b21\u6ce8\u518c\u5fc5\u987b\u91cd\u65b0\u8f93\u5165\n                    \/\/ changeCode();\n                    if(msg!=\"Error\"){  \/\/\u8bf4\u660e\u7528\u6237\u6b63\u786e,\u81ea\u52a8\u8df3\u8f6c\u54cd\u5e94\u7684url\n                        var host = location.host;\n                        var hh = \"http:\"+msg;  \/\/\u62fc\u63a5\u5bf9\u5e94\u7684url\n                        location.href = hh;  \/\/\u81ea\u52a8\u91cd\u5b9a\u5411\n                    }else {\n                        \/\/\u7528\u6237\u540d\u4e0e\u5bc6\u7801\u4e0d\u5339\u914d\n                        alert(\"\u7528\u6237\u540d\u6216\u5bc6\u7801\u9519\u8bef!\");\n                    }\n\n                },\"text\");\n        }else{\/\/\u6821\u9a8c\u672a\u901a\u8fc7,\u5e76\u8f93\u51fa\u539f\u56e0\n            if(!checkuser()){\n                alert(\"\u8bf7\u586b\u5199\u7528\u6237\u540d!\");\n                $(\"#username\").focus();\n            }else{\n                alert(\"\u8bf7\u586b\u5199\u5bc6\u7801!\");\n                $(\"#password\").focus();\n            }\n        }\n    }\n<\/script>\n<\/body>\n<\/html>\n<\/code><\/pre>\n\n\n\n
\u540e\u7aef\u4ee3\u7801<\/h2>\n\n\n\n
\u540e\u7aef\u4ee3\u7801, \u4ec5\u7ed9\u51faservlet, \u5b8c\u6574\u7684\u5e94\u8be5\u6709\u4e09\u4e2a\u7528\u6237\u7684\u5b9e\u4f53\u7c7b, \u4ee5\u53cadao<\/p>\n\n\n\n
import javax.servlet.ServletException;\nimport javax.servlet.annotation.WebServlet;\nimport javax.servlet.http.HttpServlet;\nimport javax.servlet.http.HttpServletRequest;\nimport javax.servlet.http.HttpServletResponse;\nimport java.io.IOException;\n\n\/**\n * \u5904\u7406\u7528\u6237\u7684\u767b\u5f55\u7684servlet\n *\/\n@WebServlet(name = \"LoginServlet\", urlPatterns = \"\/LoginServlet\")\npublic class LoginServlet extends HttpServlet {\n    private HttpServletRequest request;\n    private HttpServletResponse response;\n\n    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n        \/\/1.\u83b7\u53d6\u8bf7\u6c42\u53c2\u6570\n        String userType = request.getParameter(\"identity\");\n        String username = request.getParameter(\"username\");\n        String password = request.getParameter(\"password\");\n        System.out.println(\"\u83b7\u5f97\u7684\u7528\u6237\u7c7b\u578b\u662f:\"+userType);\n        System.out.println(\"\u83b7\u5f97\u7684\u7528\u6237\u8d26\u6237\u662f:\"+username);\n        System.out.println(\"\u83b7\u5f97\u7684\u7528\u6237\u5bc6\u7801\u662f:\"+password);\n        \/\/2.\u5224\u65ad\u7528\u6237\u7c7b\u578b, \u5e76\u5c01\u88c5\u4e3aAdmin,Student,\u6216Teacher\u5bf9\u8c61,\n        \/\/3.\u8c03\u7528dao\u5224\u65ad\u7528\u6237,\u5982\u679c\u7528\u6237\u8f93\u5165\u6b63\u786e,\u54cd\u5e94\u5bf9\u5e94\u7684\u540e\u53f0\u9996\u9875url,\u5e76\u7ec8\u6b62\u5904\u7406\u903b\u8f91\n        UserDao dao = new UserDaoImpl();\n        boolean userEmpty = true;\n        try{\n            if(userType.equals(\"\u5b66\u751f\")) {\n                Student student = new Student(username,password);\n                Student returnStu = dao.stuLogin(student);\n                if (returnStu!=null){\n                    \/\/\u5982\u679c\u5b66\u751f\u8d26\u6237\u5bc6\u7801\u6b63\u786e, \u54cd\u5e94\u5b83\u7684\u540e\u53f0\u9996\u9875url\n                    request.getSession().setAttribute(\"student\",username);\/\/student\u5b58\u5165\u5230session\u4e2d\n                    response.getWriter().write(request.getContextPath()+\"\/student\/index.jsp\");\n                    return;\n                }\n            }else if (userType.equals(\"\u6559\u5e08\")){\n                Teacher teacher = new Teacher(username,password);\n                Teacher returnTea = dao.teaLogin(teacher);\n                if (returnTea!=null){\n                    \/\/\u5982\u679c\u6559\u5e08\u8d26\u6237\u5bc6\u7801\u6b63\u786e, \u54cd\u5e94\u5b83\u7684\u540e\u53f0\u9996\u9875url\n                    request.getSession().setAttribute(\"teacher\",username);\/\/teacher\u5b58\u5165\u5230session\u4e2d\n                    response.getWriter().write(request.getContextPath()+\"\/teacher\/index.jsp\");\n                    return;\n                }\n            }else{\/\/\u80af\u5b9a\u662f\u7ba1\u7406\u5458\n                Admin admin = new Admin(username,password);\n                Admin returnAdm = dao.admLogin(admin);\n                if (returnAdm!=null){\n                    \/\/\u5982\u679c\u7ba1\u7406\u5458\u8d26\u6237\u5bc6\u7801\u6b63\u786e, \u54cd\u5e94\u5b83\u7684\u540e\u53f0\u9996\u9875url\n                    request.getSession().setAttribute(\"admin\",username); \/\/admin\u5b58\u5165\u5230session\u4e2d\n                    response.getWriter().write(request.getContextPath()+\"\/admin\/index.jsp\");\n                    return;\n                }\n            }\n        }catch(Exception e){\n            e.printStackTrace();\n        }\n        \/\/4.\u767b\u5f55\u5931\u8d25,\u54cd\u5e94\u9519\u8bef\u6d88\u606f, \u5e76\u7ec8\u6b62\u5904\u7406\u903b\u8f91\n        response.setContentType(\"text\/html;\");\n        System.out.println(\"Error\");\n        response.getWriter().write(\"Error\");\n        return;\n\n    }\n\n    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n        \/\/this is do nothing\n    }\n\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5728\u4f7f\u7528servlet\u8fdb\u884c\u767b\u5f55\u6821\u9a8c\u65f6, \u5f80\u5f80\u67092\u6b21\u6821\u9a8c, \u5206\u522b\u662f\u524d\u7aef\u6821\u9a8c\u548c\u540e\u7aef\u6821\u9a8c \u5982\u679c\u7528\u6237\u672a\u586b\u5199\u8868\u5355, \u6216\u683c\u5f0f… \u7ee7\u7eed\u9605\u8bfb servlet\u7684ajax\u767b\u5f55<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/22"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/comments?post=22"}],"version-history":[{"count":1,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/22\/revisions"}],"predecessor-version":[{"id":24,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/22\/revisions\/24"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/media?parent=22"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/categories?post=22"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/tags?post=22"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}