大数据正式16

分手后的思念是犯贱 2022-06-04 03:13 223阅读 0赞

# 大数据正式16 #

### EasyMall网站的注册页面的编写 ###

*  注册功能前台页面
    
     *  效果
        
         *  ![5AUg8to.png][]
     *  代码
        
         *  regist.html
            
            #  #
            
                <!DOCTYPE HTML>
                <html>
                <head>
                    <title>欢迎注册EasyMall</title>
                    <meta http-equiv="Content-type" content="text/html; charset=UTF-8" />
                    <link rel="stylesheet" href="css/regist.css"/>
                </head>
                <body>
                    <h1>欢迎注册EasyMall</h1>
                    <form action="/servlet/RegistServlet"  method="POST"  onsubmit="">
                        <table>
                            <tr>
                                <td class="tds">用户名：</td>
                                <td><input type="text" name="username"></td>
                            </tr>
                            <tr>
                                <td class="tds">密码：</td>
                                <td><input type="password" name="password"></td>
                            </tr>
                            <tr>
                                <td class="tds">确认密码：</td>
                                <td><input type="password" name="password2" ></td>
                            </tr>
                            <tr>
                                <td class="tds">昵称：</td>
                                <td><input type="text" name="nickname" ></td>
                            </tr>
                            <tr>
                                <td class="tds">邮箱：</td>
                                <td><input type="text" name="email" ></td>
                            </tr>
                            <tr>
                                <td class="tds">验证码：</td>
                                <td><input type="text" name="valistr"><img id="yzm_img" src="img/regist/yzm.png" style="cursor: pointer"/></td>
                            </tr>
                            <tr>
                                <td colspan="2">
                                    <input type="submit" value="注册用户"/>
                                </td>
                            </tr>
                        </table>
                    </form>
                </body>
                </html>
         *  regist.css
            
            #  #
            
                @charset "utf-8";
                {
                    border: 1px solid #999;
                }
                body{
                    background-image: url("../img/regist/zc.jpg");
                    background-position:top;
                    font-family:"微软雅黑";
                }
                h1{
                    width:300px;
                    margin: 190px auto 0px;
                    text-align: center;
                    color:#990000;
                }
                form{
                    width:450px;
                    margin: 30px auto 0px;
                }
                table{
                    margin: 0px auto 0px;
                }
                .tds{
                    text-align: right;
                    font-size:18px;
                }
                td{
                    padding-top:10px;   
                }
                input[type='text'],input[type='password']{
                    width:150px;
                    height:22px;
                    border: 1px solid #cccccc;
                }
                input[name='valistr']{
                    width:80px;
                }
                #yzm_img{
                    vertical-align: top;
                    margin-left:5px;
                }
                input[type='submit']{
                    background-image: url("../img/regist/zcan01.jpg");
                    width:127px;
                    height:44px;
                    border-style:none;
                    font-size:20px;
                    color:white;
                    font-weight:bold;
                }
                input[type='submit']:hover{
                    background-image: url("../img/regist/zcan02.jpg");
                }
                span{
                    color:red;
                    font-size:14px;
                }
         *  img
            
             *  yzm.png
                
                 *  ![bhsbf9X.png][]
             *  zc.jpg
                
                 *  ![sDZjgIx.jpg][]
             *  zcan01.jpg
                
                 *  ![dzc5p9l.jpg][]
             *  zcan02.jpg
                
                 *  ![axAFiDg.jpg][]
 *  注册功能后台逻辑
    
     *  思路
        
        1.  获取全局配置数据【<context-param>下的数据：例如编码utf-8】
        2.  解决乱码问题
            
            1.  解决request的乱码:
                
                1.  【post方式：request.setCharacterEncoding("utf-8")】
                2.  【get方式：先解码，再编码new String(request.getParameter("key").getBytes("iso8859-1"),"utf-8"）】
            2.  解决Response的乱码:
                
                1.  【字节："".getBytes("编码")】
                2.  【字符：response.setCharacterEncoding("编码")】
            3.  浏览器解析乱码
                
                1.  【setHeader（“Content-Type”，“text/html;charset=utf-8”）】
        3.  获取表单数据
            
             *  request.getParameter(name);
        4.  校验数据和合法性【真正的检验：js防君子，这里防小人】
            
            1.  数据不能为空
            2.  用户名不重复
            3.  密码和确认密码一致
            4.  邮箱格式
            5.  密码格式
            6.  验证码是否一致
        5.  将数据存入数据库
            
            1.  数据库连接池
            2.  归档成合适的MySqlUtils工具类
        6.  跳入指定的注册成功后的界面
     *  代码
        
         *  RegisteSer
            
            #  #
            
                package com.easymall.ser;
                
                import java.io.IOException;
                import java.sql.Connection;
                import java.sql.PreparedStatement;
                import java.sql.ResultSet;
                
                import javax.servlet.ServletContext;
                import javax.servlet.ServletException;
                import javax.servlet.http.HttpServlet;
                import javax.servlet.http.HttpServletRequest;
                import javax.servlet.http.HttpServletResponse;
                
                import com.easymall.exception.MsgException;
                import com.easymall.utils.MySqlUtils;
                
                @SuppressWarnings("serial")
                public class RegisteSer extends HttpServlet {
                    private Connection conn = null;
                    private PreparedStatement stat = null;
                    private ResultSet rs = null;
                
                    public void doGet(HttpServletRequest request, HttpServletResponse response)
                            throws ServletException, IOException {
                        // 全局变量
                        try {
                            // 0.获取应用参数
                            ServletContext sc = this.getServletContext();
                            String encode = sc.getInitParameter("encode");
                
                            // 1.解决requestpost请求乱码 解决response输出数据乱码
                            request.setCharacterEncoding(encode);
                            response.setCharacterEncoding(encode);
                            response.setContentType("text/html;charset=" + encode);
                
                            // 2.获取请求参数
                            String username = request.getParameter("username");
                            String password = request.getParameter("password");
                            String password2 = request.getParameter("password2");
                            String nickname = request.getParameter("nickname");
                            String email = request.getParameter("email");
                            String valistr = request.getParameter("valistr");
                
                            // 3.检查数据有效性 如果有问题 向浏览器报错
                            if (username == null || "".equals(username)) {
                                throw new MsgException("用户名不能为空！");
                            }
                
                            if (password == null || "".equals(password)) {
                                throw new MsgException("密码不能为空！");
                            }
                
                            if (password2 == null || "".equals(password2)) {
                                throw new MsgException("确认密码不能为空！");
                            }
                
                            if (!password.equals(password2)) {
                                throw new MsgException("两次密码不一致！");
                            }
                
                            if (nickname == null || "".equals(nickname)) {
                                throw new MsgException("昵称不能为空！");
                            }
                
                            if (email == null || "".equals(email)) {
                                throw new MsgException("邮箱不能为空！");
                            }
                
                            if (!email.matches("^\\w+@\\w+(\\.\\w+)+$")) {
                                throw new MsgException("邮箱格式不正确！");
                            }
                
                            if (valistr == null || "".equals(valistr)) {
                                throw new MsgException("验证码不能为空！");
                            }
                
                            // 4.存入数据库
                            // 判断账号是否重复
                            conn = MySqlUtils.getConn();
                            stat = conn.prepareStatement("select * from user where username=?");
                            stat.setString(1, username);
                            rs = stat.executeQuery();
                
                            if (rs.next()) {// 账号重复
                                throw new MsgException("账号重复");
                            } else {// 账号不重复
                                stat = conn
                                        .prepareStatement("insert into user values(?,?,?,?)");// 账号，密码，昵称，邮箱
                                stat.setString(1, username);
                                stat.setString(2, password);
                                stat.setString(3, nickname);
                                stat.setString(4, email);
                                stat.executeUpdate();
                
                            }
                
                            // 5.向浏览器报告成功 回到主页
                            response.getWriter().write("注册成功！正在前往主页------>>>");
                            response.setHeader("refresh", "1;url=/regist.html");
                        } catch (MsgException e) {
                            String msg = e.getMessage();
                            response.getWriter().write(msg);
                            response.setHeader("refresh", "1;url=/regist.html");
                        } catch (Exception e) {
                            e.printStackTrace();
                            throw new RuntimeException(e);
                        } finally {
                            // 关闭数据库
                            MySqlUtils.close(conn, stat, rs);
                        }
                
                    }
                
                    public void doPost(HttpServletRequest request, HttpServletResponse response)
                            throws ServletException, IOException {
                        doGet(request, response);
                    }
                
                }

### 存在的问题 ###

*  数据回显【域对象的使用】
    
     *  session和cookie的使用
 *  验证码【ajax+禁用缓存】
    
     *  ajax：Asynchronous JavaScript and XML
        
         *  本质就是通过js技术，背着浏览器，在不影响当前浏览器对当前页面的访问的情况下，偷偷的和服务器进行交流
         *  ajax在web中很常见
            
            1.  文字直播
            2.  百度地图
            3.  百度搜索框的提示
            4.  ...
         *  完全符合HTTP协议
         *  原生方式：（例）
            
            #  #
            
                <script type="text/javascript">
                    var myXmlHttpRequest;
                    //获取ajax引擎对象
                    function getXmlHttpObject() {
                
                        var xmlHttpRequest;
                        if (window.ActiveXObject) {
                            xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
                        } else {
                            xmlHttpRequest = new XMLHttpRequest();
                        }
                        return xmlHttpRequest;
                    }
                
                    function getName() {
                        var url = "doindex.jsp?username="
                                + document.getElementById("username").value;
                        myXmlHttpRequest = getXmlHttpObject();
                        if (myXmlHttpRequest) {//获取xmlhttpobject成功
                            myXmlHttpRequest.open("get", url, true);//参数一：提交方式// 参数二：地址//参数三：是否异步
                            myXmlHttpRequest.onreadystatechange = name_chuli;//回调函数(有括号-调用函数，没有括号- 地址引用)
                
                            myXmlHttpRequest.send(null);//null 针对的是“get”请求方式
                        }
                    }
                
                    function getPassword() {
                        var url = "doindex.jsp";
                        myXmlHttpRequest = getXmlHttpObject();
                        if (myXmlHttpRequest) {//获取xmlhttpobject成功
                            var data = "data=" +encodeURI(document.getElementById("password").value);
                            myXmlHttpRequest.open("post", url, true);//参数一：提交方式// 参数二：地址//参数三：是否异步
                            myXmlHttpRequest.setRequestHeader("Content-Type",
                                    "application/x-www-form-urlencoded");
                            myXmlHttpRequest.onreadystatechange = password_chuli;//回调函数(有括号-调用函数，没有括号- 地址引用)
                
                            myXmlHttpRequest.send(data);//null 针对的是“get”请求方式
                        }
                    }
                
                    //chuli函数--判断状态
                    //readyState
                    //0-open未被调用
                    //1-读取中
                    //2-已读取
                    //3-返回
                    //4-结束
                    function name_chuli() {
                        if (myXmlHttpRequest.readyState == 4) {
                            var returnText = myXmlHttpRequest.responseText;
                            getObjectById("myres").innerHTML = returnText;//innerHTML获取的是body中的内容、value获取的是整个页面
                        }
                    }
                
                    function password_chuli() {
                        if (myXmlHttpRequest.readyState == 4) {
                            var returnText = myXmlHttpRequest.responseText;
                            getObjectById("dopass").innerHTML = returnText;
                        }
                    }
                
                    //函数--封装获取id对象
                    function getObjectById(id) {
                        return document.getElementById(id);
                    }
                </script>
         *  jQuery方式的ajax
            
            1.  ajax
                
                #  #
                
                    $.ajax({ url: "test.html", context: document.body, success: function(){
                        $(this).addClass("done");
                    }});
            2.  get方式的ajax
                
                #  #
                
                    $.get("test.php", function(data){
                      alert("Data Loaded: " + data);
                    });
            3.  post方式的ajax
                
                #  #
                
                    $.post(url, [data], [callback], [type])
 *  前台的实时校验数据【先js吧--这个代码量有点大】
    
    #  #
    
        function checkForm() {
            var flag = true;
            flag = checkNull("username", "帐号不能为空！") && flag;
            flag = checkNull("password", "密码不能为空！") && flag;
            flag = checkNull("password2", "确认密码不能为空！") && flag;
            flag = checkNull("nickname", "昵称不能为空！") && flag;
            flag = checkNull("email", "邮箱不能为空！") && flag;
            flag = checkNull("valistr", "验证不能为空！") && flag;
            flag = checkEmail("email", "格式不正确，是个油箱吧！") && flag;
            flag = checkPassword("password", "两次密码不一致！") && flag;
            if (flag) {
                document.getElementById("form1").submit();
            } else {
                return;
            }
        }
        function checkPassword(name, msg) {
        
            var password = document.getElementsByName(name)[0].value;
            var password2 = document.getElementsByName(name + "2")[0].value;
            setMsg(name + "2", "");
            if ("" == password2) {
                setMsg(name + "2", "确认密码不能为空！");
                return false;
            }
            if (("" != password2) && (password != password2)) {
                setMsg(name + "2", msg);
                return false;
            }
            return true;
        }
        function checkEmail(name, msg) {
            var value = document.getElementsByName(name)[0].value;
            var reg = /^\w+@\w+(\.\w+)+$/;
            setMsg(name, "");
            if ("" == value) {
                setMsg(name, "邮箱不能为空！");
                return false;
            }
            if ((!reg.test(value)) && ("" != value)) {
                setMsg(name, msg);
                return false;
            }
            return true;
        }
        function checkNull(name, msg) {
            var value = document.getElementsByName(name)[0].value;
            setMsg(name, "");
            if ("" == value) {
                setMsg(name, msg);
                return false;
            }
            return true;
        }
        function setMsg(name, msg) {
            document.getElementById(name + "_msg").innerHTML = msg;
        }
 *  前台的实时校验数据【jQuery】
    
    #  #
    
        $(document).ready(
                    function() {
                        var canSubmit = true;//提交的标志
                        //用户名已存在检查（ajax）    
                        $("input[name='username']").blur(
                                function() {
                                    if ($("input[name='username']").val() != "") {
                                        $.get("/UserNameHasServlet?"
                                                + $.param({
                                                    "username" : $(
                                                            "input[name='username']")
                                                            .val()
                                                }), function(data) {
                                            if ($.parseJSON(data).hasUser) {
                                                //提示该账户已有
                                                $("input[name='username']")
                                                        .next("span").text("用户名重复!");
                                                canSubmit = false;
                                            } else {
                                                $("input[name='username']")
                                                        .next("span").text("");
                                                canSubmit = true;
                                            }
                                        });
                                    }
                                });
        
                        //两次密码的一致性检验(失去焦点)
                        $("input[name='password2']").blur(
                                function() {
                                    if ($("input[name='password2']").val() != "") {
                                        if ($("input[name='password']").val() != $(
                                                "input[name='password2']").val()) {//密码不一致
                                            $("input[name='password2']").next("span")
                                                    .text("密码不一致!");
                                            canSubmit = false;
                                        } else {
                                            $("input[name='password2']").next("span")
                                                    .text("");
                                            canSubmit = true;
                                        }
                                    }
                                });
                        //检查邮箱的格式是否正确
                        $("input[name='email']").blur(function() {
                            var email_Reg = /^\w+@\w+(\.\w+)+$/;
                            if ($(this).val() != "" && email_Reg.test($(this).val())) {
                                $(this).next("span").text("");
        
                                canSubmit = true;
                            } else {
                                $(this).next("span").text("邮箱格式不正确！");
                                canSubmit = false;
                            }
                        });
                        //验证码切换（点击事件）
                        $("#yzm_img").click(
                                function() {
                                    $(this).attr(
                                            "src",
                                            "/ValiImageServlet?time="
                                                    + new Date().getTime());
                                });
                        //表单提交事件
                        $("form").submit(function() {
                            //判断所有的输入框是否为空
                            $.each($("input[type!='submit']"), function() {
                                if ($(this).val() == "") {//密码不一致
                                    $(this).nextAll("span").text("数据不能为空！");
                                    canSubmit = false;
                                } else {
                                    $(this).nextAll("span").text("");
                                    canSubmit = true;
                                }
                            });
                            return canSubmit;
                        });
                    });
 *  URL编码
    
     *  java中的编解码
        
         *  URLEncoder.encode(String str,String encode)
         *  URLDecoder.decode(String str,String encode)
     *  js中的编解码
        
         *  整体：encodeURI(url)-----这里用这个
         *  传递参数：encodeURIComponent
         *  js使用数据：escape
     *  jQuery中的编解码
        
         *  $.param(\{"key":"value"\})
     *  平常的浏览器和服务器会自动进行编解码,而ajax偷偷的绕过浏览器，所以得手动编解码
     *  浏览器和服务之间是通过HTTP协议通讯的
     *  HTTP协议只支持iso8859-1字符集
        
        1.  iso8859-1里有的原样输出
        2.  iso8859-1里没有的字符，先按照指定编码转为相应的字节；然后装换为相应的16进制的数；最后最前面加上一个百分号；
        3.  转化过程
            
             *  ![ywvuJ85.png][]
 *  验证码的生成过程【没你想的那么难】
    
     *  图片展示
        
         *  ![Pl6QTgI.png][]
         *  ![WVWsJBS.png][]
         *  ![uUJY8E1.png][]
    
    #  #
    
        package com.easymall.ser;
        
        import java.awt.Color;
        import java.awt.Font;
        import java.awt.Graphics2D;
        import java.awt.image.BufferedImage;
        import java.io.IOException;
        import java.util.Random;
        
        import javax.imageio.ImageIO;
        import javax.servlet.ServletException;
        import javax.servlet.http.HttpServlet;
        import javax.servlet.http.HttpServletRequest;
        import javax.servlet.http.HttpServletResponse;
        
        @SuppressWarnings("serial")
        public class ValiImageServlet extends HttpServlet {
            // 背景参数
            private int base = 30;
            private int height = base;
            private int width = base * 4;
        
            @Override
            protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                    throws ServletException, IOException {
                // 禁止浏览器缓存图片
                resp.setHeader("Cache-Control", "no-cache");
                resp.setHeader("Progma", "no-cache");
                resp.setDateHeader("Expires", 0);
                // 创建内存中的图片
                BufferedImage di = new BufferedImage(width, height,
                        BufferedImage.TYPE_INT_RGB);
                // 获取画布画背景
                Graphics2D g2 = (Graphics2D) di.getGraphics();
                // 填充矩形
                g2.setColor(Color.white);
                g2.fillRect(0, 0, width, height);
                // 绘制边框
                g2.setColor(Color.red);
                g2.drawRect(0, 0, width - 1, height - 1);
                // 写字
                g2.setFont(new Font("微软雅黑", Font.BOLD, 25));
                for (int i = 0; i < 4; i++) {
                    g2.setColor(new Color(getRandom(0, 255),getRandom(0, 255),getRandom(0, 255)));
                    int temp = getRandom(-45, 45);
                    g2.rotate(temp / 180.0 * Math.PI, 10 + 30 * i, 20);
                    g2.drawString(Integer.toString(getRandom(0, 10)), 10 + 30 * i, 20);
                    g2.rotate(-temp / 180.0 * Math.PI, 10 + 30 * i, 20);
                }
                // 画干扰线
                for (int i = 0; i < 3; i++) {
                    g2.setColor(new Color(getRandom(0, 255),getRandom(0, 255),getRandom(0, 255)));
                    g2.drawLine(getRandom(0, width), getRandom(0, height),
                            getRandom(0, width), getRandom(0, height));
                }
                // 画干扰点
                for (int i = 0; i < 5; i++) {
                    g2.setColor(new Color(getRandom(0, 255),getRandom(0, 255),getRandom(0, 255)));
                    g2.drawOval(getRandom(0, width), getRandom(0, height), 5, 5);
                }
                // 画出图片
                ImageIO.write(di, "JPG", resp.getOutputStream());
                // 关闭画布
                g2.dispose();
            }
        
            @Override
            protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                    throws ServletException, IOException {
                this.doGet(req, resp);
            }
        
            // 获取随机数
            private int getRandom(int start, int end) {
                Random random = new Random();
                return start + random.nextInt(end - start);
            }
        
        }

### 补充 ###

*  用户名校验【ajax所联系的servlet】
    
    #  #
    
        package com.easymall.ser;
        
        import java.io.IOException;
        import java.sql.Connection;
        import java.sql.PreparedStatement;
        import java.sql.ResultSet;
        import java.sql.SQLException;
        
        import javax.servlet.ServletException;
        import javax.servlet.http.HttpServlet;
        import javax.servlet.http.HttpServletRequest;
        import javax.servlet.http.HttpServletResponse;
        
        import com.easymall.utils.MySqlUtils;
        
        public class UserNameHasServlet extends HttpServlet {
            private Connection conn = null;
            private PreparedStatement stat = null;
            private ResultSet rs = null;
            boolean hasUser = true;// 默认数据库有--防止出错
        
            protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                    throws ServletException, IOException {
                try {
                    // 获取用户名并解决乱码
                    String username = new String(req.getParameter("username").getBytes(
                            "iso8859-1"), "utf-8");
                    System.out.println(username);
                    // 查询数据库中是否有此用户
                    conn = MySqlUtils.getConn();
                    stat = conn
                            .prepareStatement("select * from user where username=? ");
                    stat.setString(1, username);
                    rs = stat.executeQuery();
                    hasUser = rs.next();// 用户名重复为true
                    System.out.println(hasUser);
                } catch (SQLException e) {
                    e.printStackTrace();
                } finally {
                    MySqlUtils.close(conn, stat, rs);
                }
                // 返回json格式的数据
                resp.getWriter().write("{\"hasUser\":" + hasUser + "}");
            }
        
            protected void doPost(HttpServletRequest req, HttpServletResponse resp)
                    throws ServletException, IOException {
                this.doGet(req, resp);
            }
        
        }
 *  自定义异常类
    
    #  #
    
        package com.easymall.exception;
        
        @SuppressWarnings("serial")
        public class MsgException extends RuntimeException {
            public MsgException() {
            }
        
            public MsgException(String msg) {
                super(msg);
            }
        }
 *  mysql工具类
    
    #  #
    
        package com.easymall.utils;
        
        import java.sql.Connection;
        import java.sql.ResultSet;
        import java.sql.SQLException;
        import java.sql.Statement;
        
        import com.mchange.v2.c3p0.ComboPooledDataSource;
        
        public class MySqlUtils {
            // 创建数据库连接池--数据连接池只允许有一个
            private static ComboPooledDataSource cpds = new ComboPooledDataSource();
        
            // 将构造函数私有化，不允许创建该实例
            private MySqlUtils() {
                super();
            }
        
            // 获取连接
            public static Connection getConn() {
                Connection conn = null;
                try {
                    conn = cpds.getConnection();
                } catch (SQLException e) {
                    // 没有获得数据库连接的异常处理[有待详细处理]
                    throw new RuntimeException(e);
                }
                return conn;
            }
        
            // 关闭资源
            public static void close(Connection conn, Statement stat, ResultSet rs) {
                if (conn != null) {
                    try {
                        conn.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    } finally {
                        conn = null;
                    }
                }
                if (stat != null) {
                    try {
                        stat.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    } finally {
                        stat = null;
                    }
                }
                if (rs != null) {
                    try {
                        rs.close();
                    } catch (SQLException e) {
                        e.printStackTrace();
                    } finally {
                        rs = null;
                    }
                }
            }
        
        }
 *  c3p0.properties
    
    #  #
    
        c3p0.driverClass=com.mysql.jdbc.Driver
        c3p0.jdbcUrl=jdbc:mysql://localhost:3306/easymall
        c3p0.user=root
        c3p0.password=root
 *  数据库
    
    #  #
    
        CREATE TABLE `user` (
          `username` varchar(32) NOT NULL,
          `password` varchar(32) NOT NULL,
          `nickname` varchar(32) NOT NULL,
          `email` varchar(32) NOT NULL,
          PRIMARY KEY (`username`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8；
 *  user表结构
    
     *  ![NCUuajw.png][]
 *  web.xml
    
    #  #
    
        <?xml version="1.0" encoding="UTF-8"?>
        <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
            http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
        
            
            <context-param>
                <param-name>encode</param-name>
                <param-value>utf-8</param-value>
            </context-param>
        
            
            <servlet>
                <servlet-name>RegisteSer</servlet-name>
                <servlet-class>com.easymall.ser.RegisteSer</servlet-class>
            </servlet>
          <servlet>
            <servlet-name>UserNameHasServlet</servlet-name>
            <servlet-class>com.easymall.ser.UserNameHasServlet</servlet-class>
          </servlet>
          <servlet>
            <servlet-name>ValiImageServlet</servlet-name>
            <servlet-class>com.easymall.ser.ValiImageServlet</servlet-class>
          </servlet>
        
            
            <servlet-mapping>
                <servlet-name>RegisteSer</servlet-name>
                <url-pattern>/RegisteSer</url-pattern>
            </servlet-mapping>
          <servlet-mapping>
            <servlet-name>UserNameHasServlet</servlet-name>
            <url-pattern>/UserNameHasServlet</url-pattern>
          </servlet-mapping>
          <servlet-mapping>
            <servlet-name>ValiImageServlet</servlet-name>
            <url-pattern>/ValiImageServlet</url-pattern>
          </servlet-mapping>
        
            
            <welcome-file-list>
                <welcome-file>index.jsp</welcome-file>
            </welcome-file-list>
        </web-app>
 *  jar包
    
     *  c3p0-0.9.1.2.jar
     *  mysql-connector-java-5.0.8-bin.jar
 *  ajax图文资料
    
     *  ![z9DKKfE.jpg][]

[5AUg8to.png]: https://i.imgur.com/5AUg8to.png
[bhsbf9X.png]: https://i.imgur.com/bhsbf9X.png
[sDZjgIx.jpg]: https://i.imgur.com/sDZjgIx.jpg
[dzc5p9l.jpg]: https://i.imgur.com/dzc5p9l.jpg
[axAFiDg.jpg]: https://i.imgur.com/axAFiDg.jpg
[ywvuJ85.png]: https://i.imgur.com/ywvuJ85.png
[Pl6QTgI.png]: https://i.imgur.com/Pl6QTgI.png
[WVWsJBS.png]: https://i.imgur.com/WVWsJBS.png
[uUJY8E1.png]: https://i.imgur.com/uUJY8E1.png
[NCUuajw.png]: https://i.imgur.com/NCUuajw.png
[z9DKKfE.jpg]: https://i.imgur.com/z9DKKfE.jpg