网站排名突然掉没了,WordPress文字按钮变色,小程序开发费用清单,二十一冶建设有限公司网站文章目录 一、Filter1.1 基本介绍1.2 过滤器的执行流程1.3 拦截路径配置1.4 过滤器链1.5 案例 二、Listener三、AJAX3.1 快速入门3.2 Axios异步框架 四、 JSON4.1 JSON基础语法4.2 Fastjson 五、 案例JSONAxiosServlet Java web的三大组件#xff1a;Servlet、Filter、Listene… 文章目录 一、Filter1.1 基本介绍1.2 过滤器的执行流程1.3 拦截路径配置1.4 过滤器链1.5 案例 二、Listener三、AJAX3.1 快速入门3.2 Axios异步框架 四、 JSON4.1 JSON基础语法4.2 Fastjson 五、 案例JSONAxiosServlet Java web的三大组件Servlet、Filter、Listener
一、Filter
1.1 基本介绍
过滤器可以把对资源的请求拦截下来从而实现一些特殊的功能。过滤器一般完成一些通用的操作权限控制、统一编码处理 、 敏感字符处理 等
使用步骤
实现Filter接口添加WebFilter注解并配置拦截路径实现doFilter方法
WebFilter(/*) // 拦截所有页面
public class LoginFilter implements Filter {public void init(FilterConfig config) throws ServletException {}public void destroy() {}Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {HttpServletRequest req (HttpServletRequest) request;// 1.当出现以下资源可以放行//判断访问资源路径是否和登录注册相关String[] urls {/login.jsp,/imgs/,/css/,/loginServlet,/register.jsp,/registerServlet,/checkCodeServlet};// 获取当前访问的资源路径String url req.getRequestURL().toString();//循环判断for (String u : urls) {if(url.contains(u)){//找到了//放行chain.doFilter(request, response);//break;return;}}//2. 判断session中是否有userHttpSession session req.getSession();Object user session.getAttribute(user);//3. 判断user是否为nullif(user ! null){// 登录过了//放行chain.doFilter(request, response);}else {// 没有登陆存储提示信息跳转到登录页面req.setAttribute(login_msg,您尚未登陆);req.getRequestDispatcher(/login.jsp).forward(req,response);}}
}
1.2 过滤器的执行流程 1.3 拦截路径配置 1.4 过滤器链 1.5 案例
二、Listener 使用步骤
实现ServletContextListener接口添加WebListener注解实现接口方法
三、AJAX
3.1 快速入门 SelectUserServlet.java
WebServlet(/selectUserServlet)
public class SelectUserServlet extends HttpServlet {Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1. 接收用户名String username request.getParameter(username);//2. 调用service查询User对象boolean flag true;//3. 响应标记response.getWriter().write( flag);}Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doGet(request, response);}
}register.html
!DOCTYPE html
html langen
headmeta charsetUTF-8title欢迎注册/titlelink hrefcss/register.css relstylesheet
/head
bodydiv classform-divdiv classreg-contenth1欢迎注册/h1span已有帐号/span a hreflogin.html登录/a/divform idreg-form action# methodgettabletrtd用户名/tdtd classinputsinput nameusername typetext idusernamebrspan idusername_err classerr_msg styledisplay: none用户名已存在/span/td/trtrtd密码/tdtd classinputsinput namepassword typepassword idpasswordbrspan idpassword_err classerr_msg styledisplay: none密码格式有误/span/td/trtrtd验证码/tdtd classinputsinput namecheckCode typetext idcheckCodeimg srcimgs/a.jpga href# idchangeImg看不清/a/td/tr/tablediv classbuttonsinput value注 册 typesubmit idreg_btn/divbr classclear/form/divscript//1. 给用户名输入框绑定 失去焦点事件document.getElementById(username).onblur function () {//2. 发送ajax请求// 获取用户名的值var username this.value;//2.1. 创建核心对象var xhttp;if (window.XMLHttpRequest) {xhttp new XMLHttpRequest();} else {// code for IE6, IE5xhttp new ActiveXObject(Microsoft.XMLHTTP);}//2.2. 发送请求xhttp.open(GET, http://localhost:8080/ajax-demo/selectUserServlet?usernameusername);xhttp.send();//2.3. 获取响应xhttp.onreadystatechange function() {if (this.readyState 4 this.status 200) {//alert(this.responseText);//判断if(this.responseText true){//用户名存在显示提示信息document.getElementById(username_err).style.display ;}else {//用户名不存在 清楚提示信息document.getElementById(username_err).style.display none;}}};}/script
/body
/html3.2 Axios异步框架
Axios对AJAX的代码进行封装简化代码书写。
axios-0.18.0.js
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//# sourceMappingURLaxios.min.map使用步骤
引入axios.js文件
script srcjs/axios-0.18.0.js/script使用axios发送请求并获取响应结果
script// 第一种方式//1. getaxios({method:get,url:http://localhost:8080/ajax-demo/axiosServlet?usernamezhangsan}).then(function (resp) {alert(resp.data);})//2. postaxios({method:post,url:http://localhost:8080/ajax-demo/axiosServlet,data:usernamezhangsan}).then(function (resp) {alert(resp.data);})// 也可以这么写var jsObject {name:zhangsan};axios({method:post,url:http://localhost:8080/ajax-demo/axiosServlet,data:jsObject}).then(function (resp) {alert(resp.data);})// 第二种方式axios.get(http://localhost:8080/ajax-demo/axiosServlet?usernamezhangsan).then(function (resp) {alert(resp.data);})axios.post(http://localhost:8080/ajax-demo/axiosServlet,usernamezhangsan).then(function (resp) {alert(resp.data);})/script
四、 JSON
4.1 JSON基础语法 4.2 Fastjson
Fastjson 是阿里巴巴提供的一个Java语言编写的高性能功能完善的 JSON 库是目前Java语言中最快的 JSON 库可以实 现 Java 对象和 JSON 字符串的相互转换。 Fastjson 使用也是比较简单的分为以下三步完成
导入坐标
dependencygroupIdcom.alibaba/groupIdartifactIdfastjson/artifactIdversion1.2.62/version
/dependencyJava对象转JSON
String jsonStr JSON.toJSONString(obj);将 Java 对象转换为 JSON 串只需要使用 Fastjson 提供的 JSON 类中的 toJSONString() 静态方法即可。
JSON字符串转Java对象
User user JSON.parseObject(jsonStr, User.class); 将 json 转换为 Java 对象只需要使用 Fastjson 提供的 JSON 类中的 parseObject() 静态方法即可。
五、 案例JSONAxiosServlet
使用JSONAxios完成查看全部数据和添加数据
brand.html 显示数据
!DOCTYPE html
html langen
headmeta charsetUTF-8titleTitle/title
/head
body
a hrefaddBrand.htmlinput typebutton value新增/abr
hr
table idbrandTable border1 cellspacing0 width100%trth序号/thth品牌名称/thth企业名称/thth排序/thth品牌介绍/thth状态/thth操作/th/trtr aligncentertd1/tdtd三只松鼠/tdtd三只松鼠/tdtd100/tdtd三只松鼠好吃不上火/tdtd启用/tdtda href#修改/a a href#删除/a/td/trtr aligncentertd2/tdtd优衣库/tdtd优衣库/tdtd10/tdtd优衣库服适人生/tdtd禁用/tdtda href#修改/a a href#删除/a/td/trtr aligncentertd3/tdtd小米/tdtd小米科技有限公司/tdtd1000/tdtd为发烧而生/tdtd启用/tdtda href#修改/a a href#删除/a/td/tr
/tablescript srcjs/axios-0.18.0.js/scriptscript//1. 当页面加载完成后发送ajax请求window.onload function () {//2. 发送ajax请求axios({method:get,url:http://localhost:8080/ajax-demo/selectAllServlet}).then(function (resp) {//获取数据let brands resp.data;let tableData tr\n th序号/th\n th品牌名称/th\n th企业名称/th\n th排序/th\n th品牌介绍/th\n th状态/th\n th操作/th\n /tr;for (let i 0; i brands.length ; i) {let brand brands[i];tableData \n tr align\center\\n td(i1)/td\n tdbrand.brandName/td\n tdbrand.companyName/td\n tdbrand.ordered/td\n tdbrand.description/td\n tdbrand.status/td\n \n tda href\#\修改/a a href\#\删除/a/td\n /tr;}// 设置表格数据document.getElementById(brandTable).innerHTML tableData;})}/script/body
/htmladdBrand.html 添加数据
!DOCTYPE html
html langenheadmeta charsetUTF-8title添加品牌/title
/head
body
h3添加品牌/h3
form action methodpost品牌名称input idbrandName namebrandNamebr企业名称input idcompanyName namecompanyNamebr排序input idordered nameorderedbr描述信息textarea rows5 cols20 iddescription namedescription/textareabr状态input typeradio namestatus value0禁用input typeradio namestatus value1启用brinput typebutton idbtn value提交
/formscript srcjs/axios-0.18.0.js/scriptscript//1. 给按钮绑定单击事件document.getElementById(btn).onclick function () {// 将表单数据转为jsonvar formData {brandName:,companyName:,ordered:,description:,status:,};// 获取表单数据let brandName document.getElementById(brandName).value;// 设置数据formData.brandName brandName;// 获取表单数据let companyName document.getElementById(companyName).value;// 设置数据formData.companyName companyName;// 获取表单数据let ordered document.getElementById(ordered).value;// 设置数据formData.ordered ordered;// 获取表单数据let description document.getElementById(description).value;// 设置数据formData.description description;let status document.getElementsByName(status);for (let i 0; i status.length; i) {if(status[i].checked){//formData.status status[i].value ;}}console.log(formData);//2. 发送ajax请求axios({method:post,url:http://localhost:8080/ajax-demo/addServlet,data:formData}).then(function (resp) {// 判断响应数据是否为 successif(resp.data success){location.href http://localhost:8080/ajax-demo/brand.html;}})}/script
/body
/htmlSelectAllServelt.java
WebServlet(/selectAllServlet)
public class SelectAllServelt extends HttpServlet {private BrandService brandService new BrandService();Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// Object-JSONListBrand brands brandService.selectAll();String s JSON.toJSONString(brands);// 解决中文乱码response.setContentType(text/json;charsetutf-8);// 响应数据response.getWriter().write(s);}Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doGet(request,response);}
}AddServlet.java
WebServlet(/addServlet)
public class AddServlet extends HttpServlet {private BrandService brandService new BrandService();Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1. 接收数据,request.getParameter 不能接收json的数据/* String brandName request.getParameter(brandName);System.out.println(brandName);*/// 获取请求体数据BufferedReader br request.getReader();String params br.readLine();// 将JSON字符串转为Java对象Brand brand JSON.parseObject(params, Brand.class);//2. 调用service 添加brandService.add(brand);//3. 响应成功标识response.getWriter().write(success);}Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doGet(request,response);}
}
