• 【JavaWeb】登录权限验证,AJAX异步验证用账号是否存在

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    🌈登录权限验证

    🎨登录权限案例说明

    🎰案例需求: 访问服务器资源时,需要先进行登录验证,如果没有登录,则跳转到登录页面

    💨实际生活中,当你登录某个服务器访问资源时,访问结束后,浏览器页面没有关闭,长时间的挂着,过了一段时间后再次回到这个页面访问资源时,页面会跳转至登录页面让你重新登录,其实就是Session对象默认存活30分钟已过,会自动销毁登录信息

    实现步骤:

    📌使用过滤器Filter来完成登录验证

    📌判断访问的是否是不需要权限的资源,不用一些静态资源(html,css,js,图片等)

            🔑如果是就放行

            🔑如果不是就进行登录验证

    📌判断用户是否登录,session中是否有user对象

            🔑有就放行

            🔑没有就跳转到登录页面,让其重新登录

    🎨代码实现

    🔎LoginFilter

    1. package com.moming.web.filter;
    2.  
    3. import com.moming.pojo.User;
    4.  
    5. import javax.servlet.*;
    6. import javax.servlet.annotation.*;
    7. import javax.servlet.http.HttpServletRequest;
    8. import javax.servlet.http.HttpSession;
    9. import java.io.IOException;
    10.  
    11. /**
    12.  * 登录验证的过滤器
    13.  */
    14. @WebFilter("/*")
    15. public class LoginFilter implements Filter {
    16.     @Override
    17.     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
    18.         HttpServletRequest req = (HttpServletRequest) request;
    19.         //判断访问的资源路径是否和登录注册相关,如果相关就放行
    20.         String[] urls = {"/login.jsp","/loginServlet","register.jsp","/registerServlet","/css/","/imgs/","/checkCodeServlet"};
    21.         //获取当前资源的访问路径
    22.         String url = req.getRequestURL().toString();
    23.         for (String u : urls) {
    24.             //判断u是否包含url
    25.             if(url.contains(u)){
    26.             //放行
    27.             chain.doFilter(request, response);
    28.             //结束方法,后边的代码不用执行
    29.             return;
    30.             }
    31.         }
    32.         //判断session中是否有user对象
    33.         HttpSession session = req.getSession();
    34.         Object user = session.getAttribute("user");
    35.         if(user!=null){
    36.             //用户已登录
    37.             //放行
    38.             chain.doFilter(request, response);
    39.         }else {
    40.             //用户没有登录,或者session域已经销毁了
    41.             req.setAttribute("msg", "您尚未登录!");
    42.             //转发
    43.             req.getRequestDispatcher("/login.jsp").forward(request,response);
    44.         }
    45.  
    46.     }
    47.  
    48.     public void init(FilterConfig config) throws ServletException {
    49.     }
    50.  
    51.     public void destroy() {
    52.     }
    53.  
    54.  
    55. }

    🌈AJAX异步验证用户名是否存在

    🎨验证用户名是否存在

    🎰案例需求: 在完成用户注册时,当用户名输入框失去焦点时,校验用户名是否在数据库中已经存在,如果存在,直接给出提示信息 

    🎨案例框架

    🎨引入js本地文件

    🔎axios-0.18.0.js

    1. /* axios v0.18.0 | (c) 2018 by Matt Zabriskie */
    2. !function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.axios=t():e.axios=t()}(this,function(){return function(e){function t(r){if(n[r])return n[r].exports;var o=n[r]={exports:{},id:r,loaded:!1};return e[r].call(o.exports,o,o.exports,t),o.loaded=!0,o.exports}var n={};return t.m=e,t.c=n,t.p="",t(0)}([function(e,t,n){e.exports=n(1)},function(e,t,n){"use strict";function r(e){var t=new s(e),n=i(s.prototype.request,t);return o.extend(n,s.prototype,t),o.extend(n,t),n}var o=n(2),i=n(3),s=n(5),u=n(6),a=r(u);a.Axios=s,a.create=function(e){return r(o.merge(u,e))},a.Cancel=n(23),a.CancelToken=n(24),a.isCancel=n(20),a.all=function(e){return Promise.all(e)},a.spread=n(25),e.exports=a,e.exports.default=a},function(e,t,n){"use strict";function r(e){return"[object Array]"===R.call(e)}function o(e){return"[object ArrayBuffer]"===R.call(e)}function i(e){return"undefined"!=typeof FormData&&e instanceof FormData}function s(e){var t;return t="undefined"!=typeof ArrayBuffer&&ArrayBuffer.isView?ArrayBuffer.isView(e):e&&e.buffer&&e.buffer instanceof ArrayBuffer}function u(e){return"string"==typeof e}function a(e){return"number"==typeof e}function c(e){return"undefined"==typeof e}function f(e){return null!==e&&"object"==typeof e}function p(e){return"[object Date]"===R.call(e)}function d(e){return"[object File]"===R.call(e)}function l(e){return"[object Blob]"===R.call(e)}function h(e){return"[object Function]"===R.call(e)}function m(e){return f(e)&&h(e.pipe)}function y(e){return"undefined"!=typeof URLSearchParams&&e instanceof URLSearchParams}function w(e){return e.replace(/^\s*/,"").replace(/\s*$/,"")}function g(){return("undefined"==typeof navigator||"ReactNative"!==navigator.product)&&("undefined"!=typeof window&&"undefined"!=typeof document)}function v(e,t){if(null!==e&&"undefined"!=typeof e)if("object"!=typeof e&&(e=[e]),r(e))for(var n=0,o=e.length;ncall(null,e[n],n,e);else for(var i in e)Object.prototype.hasOwnProperty.call(e,i)&&t.call(null,e[i],i,e)}function x(){function e(e,n){"object"==typeof t[n]&&"object"==typeof e?t[n]=x(t[n],e):t[n]=e}for(var t={},n=0,r=arguments.length;nv(arguments[n],e);return t}function b(e,t,n){return v(t,function(t,r){n&&"function"==typeof t?e[r]=E(t,n):e[r]=t}),e}var E=n(3),C=n(4),R=Object.prototype.toString;e.exports={isArray:r,isArrayBuffer:o,isBuffer:C,isFormData:i,isArrayBufferView:s,isString:u,isNumber:a,isObject:f,isUndefined:c,isDate:p,isFile:d,isBlob:l,isFunction:h,isStream:m,isURLSearchParams:y,isStandardBrowserEnv:g,forEach:v,merge:x,extend:b,trim:w}},function(e,t){"use strict";e.exports=function(e,t){return function(){for(var n=new Array(arguments.length),r=0;rlength;r++)n[r]=arguments[r];return e.apply(t,n)}}},function(e,t){function n(e){return!!e.constructor&&"function"==typeof e.constructor.isBuffer&&e.constructor.isBuffer(e)}function r(e){return"function"==typeof e.readFloatLE&&"function"==typeof e.slice&&n(e.slice(0,0))}/*!
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    4.  *
    5.  * @author   Feross Aboukhadijeh 
    6.  * @license  MIT
    7.  */
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    9. //# sourceMappingURL=axios.min.map

     🎨代码实现

    🔎UserService

    1. package com.moming.service;
    2.  
    3. import com.moming.mapper.UserMapper;
    4. import com.moming.pojo.User;
    5. import com.moming.util.SqlSessionFactoryUtils;
    6. import org.apache.ibatis.session.SqlSession;
    7. import org.apache.ibatis.session.SqlSessionFactory;
    8.  
    9. public class UserService {
    10.     SqlSessionFactory sqlSessionFactory = SqlSessionFactoryUtils.getSqlSessionFactory();
    11.     public User selectUserName(String username){
    12.         //获取sqlSession
    13.         SqlSession sqlSession = sqlSessionFactory.openSession();
    14.         //获取mapper
    15.         UserMapper mapper = sqlSession.getMapper(UserMapper.class);
    16.         //调用dao层
    17.         User user = mapper.selectUserName(username);
    18.         sqlSession.close();
    19.         return user;
    20.     }
    21. }

    🔎SelectUserServlet

    1. package com.moming.web.servlet;
    2.  
    3. import com.moming.pojo.User;
    4. import com.moming.service.UserService;
    5.  
    6. import javax.servlet.*;
    7. import javax.servlet.http.*;
    8. import javax.servlet.annotation.*;
    9. import java.io.IOException;
    10.  
    11. @WebServlet("/selectUserServlet")
    12. public class SelectUserServlet extends HttpServlet {
    13.     UserService userService = new UserService();
    14.     @Override
    15.     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    16.         //1.接收用户名
    17.         String username = request.getParameter("username");
    18.         //2.调用service层查询User对象
    19.         User user = userService.selectUserName(username);
    20.         //响应字符串
    21.         if(user!=null){
    22.             // 说明用户名已经存在了
    23.             response.getWriter().print("1");
    24.         }else {
    25.             response.getWriter().print("0");
    26.         }
    27.     }
    28.  
    29.     @Override
    30.     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    31.         doGet(request, response);
    32.     }
    33. }

    🔎register.html

    1. html>
    2. <html lang="en">
    3. <head>
    4.   <meta charset="UTF-8">
    5.   <title>注册title>
    6.   <link href="css/register.css" rel="stylesheet">
    7.   <script src="js/axios-0.18.0.js">script>
    8. head>
    9. <body>
    10. <div class="form-div">
    11.   <div class="reg-content">
    12.     <h1>注册页面h1>
    13.     <span>已有帐号点击:span> <a href="login.html">登录a>
    14.   div>
    15.   <form id="reg-form" action="/moming/registerServlet" method="post">
    16.     <table>
    17.       <tr>
    18.         <td>账号:td>
    19.         <td class="inputs">
    20.           <input name="username" type="text" id="username">
    21.           <br>
    22.           
    23.           <span id="username_err">span>
    24.         td>
    25.       tr>
    26.       <tr>
    27.         <td>密码:td>
    28.         <td class="inputs">
    29.           <input name="password" type="password" id="password">
    30.           <br>
    31.           <span id="password_err" class="err_msg" style="display: none">密码格式有误span>
    32.         td>
    33.       tr>
    34.     table>
    35.     <div class="buttons">
    36.       <input value="注 册" type="submit" id="reg_btn">
    37.     div>
    38.     <br class="clear">
    39.   form>
    40. div>
    67.  
    73. <script>
    74.   //1: 给用户名输入框绑定一个失去焦点事件
    75.   document.getElementById("username").onblur=function (){
    76.     //2: 在事件触发的时候,利用axios给服务器发请求,携带用户名,让servlet根据用户名查询用户对象是否存在
    77.     axios({
    78.       method:"get",
    79.       url:"http://localhost:8080/moming/selectUserServlet?username="+document.getElementById("username").value
    80.     }).then(function (r){
    81.       //  3: 如果用户存在,我们就返回1 ,如果不存在,返回 0
    82.       if('1'==r.data){
    83.         //4: 根据服务器响应的内容,利用js对 span的内容进行相应的提示
    84.         document.getElementById("username_err").innerHTML='用户名已被使用';
    85.       }else {
    86.         document.getElementById("username_err").innerHTML='用户名可用';
    87.       }
    88.     });
    89.   }
    90.  
    91. script>
    92. body>
    93. html>

    💦总结说明

    登录权限验证是基于之前的案例多加了一个过滤器,例如直接访问success.jsp时过滤器会通过session对象查询是否有用户对象,如果有就有权限访问,没有就去登录,目的练习过滤器的基本使用.

    AJAX异步验证用户名是否存在是一个新的案例,没有展示的代码和之前的一致,主要作用就是用户在注册时,不用全部信息都输入完成后再校验,而是通过鼠标离焦事件调用servlet去通过service层调用dao层查询用户名是否存在,返回结果,提高用户体验,涉及计算axios异步框架的使用.

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  • 原文地址：https://blog.csdn.net/HeyVIrBbox/article/details/126808637