• JavaEE编码题

    1.请编写代码实现登录效果（5分）

    要求：

    1）手写出相应的HTML和CSS代码

    2）字体大小12px，表格宽300px，按钮行占两列并水平居中，

    3）可以写在style节点内，也可使用行内CSS或者外部.css文件，但必须有核心代码

    Css:

     1 table 
 2 {
 3     font-size: 12px;
 4     border: solid 1px blue;
 5     border-collapse: collapse;
 6     width: 300px;
 7 }
 8 td 
 9 {
10     font-size: 12px;
11     border: solid 1px blue;
12 }

    HTML:

     1 <table>
 2     <tr>
 3         <td>姓名</td>
 4         <td>
 5             <input type="text" name="uname">
 6         </td>
 7     </tr>
 8     <tr>
 9         <td>密码</td>
10         <td>
11             <input type="text" name="pwd">
12         </td>
13     </tr>
14     <tr>
15         <td colspan="2" align="center">
16             <input type="submit" value="登录">
17         </td>
18     </tr>
19 </table>

    2.请编写代码实现下图效果。（6分）

    要求：

    1）表格使用table完成

    2）当鼠标移动到指定表格，显示对应的背景颜色

    3）鼠标离开时，颜色返回成白色

    HTML:

     1 <table>
 2     <tr>
 3         <td id="td1" onmouseover="changeColor('td1','red')" onmouseout="changeColor('td1','#ffffff')">红色
 4         </td>
 5         <td id="td2" onmouseover="changeColor('td2','blue')" onmouseout="changeColor('td2','#ffffff')">蓝色
 6         </td>
 7         <td id="td3" onmouseover="changeColor('td3','green')" onmouseout="changeColor('td3','#ffffff')">绿色
 8         </td>
 9     </tr>
10 </table>

    CSS:

     1 <style type="text/css">
 2     table 
 3     {
 4         font-size: 12px;
 5         border: solid 1px blue;
 6         border-collapse: collapse;
 7         width: 300px;
 8     }
 9     td 
10     {
11         font-size: 12px;
12         border: solid 1px blue;
13     }
14 </style>

    JS:

    1 <script>
2     function changeColor(id,obj)
3     {
4         //获得div设置style的background的值
5         document.getElementById(id).style.background=obj;
6     }
7 </script>

    3. 请编码实现如下效果。（9分）

    要求：

    1）当“重复密码”框失去焦点时，判断两次密码一致性，如果不一致，在后面文本框中显示上图效果，如果一致，“两次密码不一致”提示消失

    2）年龄判断，要求年龄必须是数字

    HTML:

     1 <table>
 2     <tr>
 3         <td>姓名</td>
 4         <td>
 5             <input type="text" id="uname" name="username" onblur="checkname()">
 6         </td>
 7         <td id="namemess"></td>
 8     </tr>
 9     <tr>
10         <td>密码</td>
11         <td>
12             <input type="password" id="pwd" name="pwd">
13         </td>
14         <td></td>
15     </tr>
16     <tr>
17         <td>重复密码</td>
18         <td>
19             <input type="password" id="pwd2" name="pwd2" onblur="checkpwd()">
20         </td>
21         <td id="pwdmsg"></td>
22     </tr>
23     <tr>
24         <td>年龄</td>
25         <td>
26             <input type="text" id="age" name="age" onblur="checkage()">
27         </td>
28         <td id="agemsg"></td>
29     </tr>
30     <tr>
31         <td>性别</td>
32         <td>
33             <input type="radio" value="1" name="sex">男  &nbsp;&nbsp;&nbsp;
34                 <input type="radio" value="0" name="sex">女
35         </td>
36     </tr>
37     <tr>
38         <td>爱好</td>
39         <td>
40             <input type="checkbox" value="1" name="aihao">足球  &nbsp;&nbsp;&nbsp;
41                 <input type="checkbox" value="2" name="aihao">
42                     蓝球
43                     <input type="checkbox" value="3" name="aihao">
44                         羽毛球
45                         <input type="checkbox" name="aihao" value="4">乒乓球
46         </td>
47     </tr>
48     <tr>
49         <td>班级</td>
50         <td>
51             <select name="banji">
52                 <option value="1">一年级一班</option>
53                 <option value="2">一年级2班</option>
54                 <option value="3">一年级3班</option>
55                 <option value="4">一年级4班</option>
56             </select>
57         </td>
58     </tr>
59     <tr>
60         <td>
61             <input type="reset" value="重置">
62         </td>
63         <td align="center">
64             <input type="submit" value="提交">
65         </td>
66     </tr>
67 </table>
68

    CSS:

     1 <style type="text/css">
 2     table
 3     {
 4         font-size: 12px;
 5         border: solid 1px blue;
 6         border-collapse:collapse;
 7     }
 8     td
 9     {
10         border:solid 1px blue;
11     }
12 </style> 

    JS:

     1 <script type="text/javascript">
 2     function checkpwd()
 3     {//验证两次密码是否一致
 4         var pwd1 = document.getElementById("pwd");
 5         var v1 = pwd1.value;
 6         var pwd2 = document.getElementById("pwd2");
 7         var v2 = pwd2.value;
 8         var pwdmsg = document.getElementById("pwdmsg");
 9         if(v1==v2)
10         {
11             pwdmsg.innerHTML="";
12         }
13         else
14         {
15             pwdmsg.innerHTML="两次密码不一样";
16         }
17     }
18     function checkage()
19     {//验证年龄是不是数字
20         var age = document.getElementById("age");
21         var v1 = age.value;
22         var agemsg = document.getElementById("agemsg");
23         if(isNaN(v1))
24         {
25             agemsg.innerHTML="年龄必须是数字";
26         }
27         else
28         {
29         agemsg.innerHTML="";
30         }
31     }
32 </script>

    4. 编写程序实现登录功能

    要求：

    1）页面使用jsp表单提交，包含姓名和密码

    2）提交目的地为Servlet，在Servlet中获得表单提交的数据

    3）在Servlet中判断，如果姓名是“张三”，密码是“123”，返回客户登录成功

    4）写出核心代码即可

    JSP:

     1 <form action="login" method="post">
 2     <table>
 3         <tr>
 4             <td>姓名</td>
 5             <td>
 6                 <input type="text" name="uname">
 7             </td>
 8         </tr>
 9         <tr>
10             <td>密码</td>
11             <td>
12                 <input type="text" name="pwd">
13             </td>
14         </tr>
15         <tr>
16             <td colspan="2" align="center">
17                 <input type="submit" value="登录">
18             </td>
19         </tr>
20     </table>
21 </form>

    Servlet:

     1 public class LoginServlet extends HttpServlet
 2 {
 3     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
 4             throws ServletException, IOException
 5     {
 6         doPost(req, resp);
 7     }
 8 
 9     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
10             throws ServletException, IOException
11     {
12         req.setCharacterEncoding("utf-8");
13         String name = req.getParameter("uname");
14         String pwd = req.getParameter("pwd");
15         System.out.println(name + "=" + pwd);
16         resp.setContentType("text/html;charset=utf-8");
17         if (name.equals("张三") && pwd.equals("123"))
18         {
19             resp.getWriter().println("登录成功");
20         }
21         else
22         {
23             resp.getWriter().println("登录失败");
24         }
25     }
26 }

    Web.xml配置：

    1 <servlet>
2     <servlet-name>login</servlet-name>
3     <servlet-class>com.bjsxtch01.LoginServlet</servlet-class>
4 </servlet>
5 <servlet-mapping>
6     <servlet-name>login</servlet-name>
7     <url-pattern>/login</url-pattern>
8 </servlet-mapping>

    5. 以下出版社管理系统部分模块，按照要求实现对应功能代码。（9分）

    1）在数据库中表结构如下书本表

    Name

    NO

    Price

    Publisher

    Android开发基础

    1001

    80

    清华大学出版社

    2）在Servlet中接收表单提交的书籍信息，调用DAO类存入数据库中

    3）编写Servlet实现，DAO实现，JavaBean实现

    4）可以没有表单代码和DBConnection实现，核心代码即可

    Servlet：

     1 protected void doGet(HttpServletRequest req, HttpServletResponse resp)
 2         throws ServletException, IOException 
 3 {
 4     this.doPost(req, resp);
 5 }
 6 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
 7         throws ServletException, IOException 
 8 {
 9     req.setCharacterEncoding("utf-8");
10     String name = req.getParameter("bookname");
11     String no = req.getParameter("no");
12     String price = req.getParameter("price");
13     String publisher = req.getParameter("publisher");
14     Book book = new Book();
15     book.setName(name);
16     book.setNo(no);
17     book.setPrice(price==null?0.0:Double.parseDouble(price));
18     book.setPublisher(publisher);
19     BookDAO dao = new BookDAO();
20     boolean b = dao.addBook(book);
21     if(b)
22     {
23         req.getRequestDispatcher("success.jsp").forward(req, resp);
24     }
25     else
26     {
27         req.getRequestDispatcher("error.jsp").forward(req, resp);
28     }
29 }

    DAO:

     1 public boolean addBook(Book book)
 2 {
 3     boolean b = false;
 4     try 
 5     {
 6         MyConnection mcon = new MyConnection();
 7         Connection conn = mcon.getConn();
 8         String sql = "insert into student(name,no,price,publisher)" + " values('"+book.getName()+"','"+book.getNo()+"',"+book.getPrice()+",'"+book.getPublisher()+"')";
 9         System.out.println(sql);
10         Statement st = conn.createStatement();
11         st.executeUpdate(sql);
12         b = true;
13         mcon.closeConn(conn);
14     }
15     catch (SQLException e) 
16     {
17         e.printStackTrace();
18     }
19     return b;
20 } 

    JavaBean:

     1 public class Book
 2 {
 3     private String name;
 4     private String no;
 5     private Double price;
 6     private String publisher;
 7     public String getName()
 8     {
 9         return name;
10     }
11     public void setName(String name)
12     {
13         this.name = name;
14     }
15     public String getNo()
16     {
17         return no;
18     }
19     public void setNo(String no)
20     {
21         this.no = no;
22     }
23     public Double getPrice()
24     {
25         return price;
26     }
27     public void setPrice(Double price)
28     {
29         this.price = price;
30     }
31     public String getPublisher()
32     {
33         return publisher;
34     }
35     public void setPublisher(String publisher)
36     {
37         this.publisher = publisher;
38     }
39 }

    6. 以下出版社管理系统部分模块，按照要求实现对应功能代码。（9分）

    1)在页面中显示书本列表

    Name

    NO

    Price

    Publisher

    操作

    Android开发基础

    1001

    80

    清华大学出版社

    删除

    Core Java

    1002

    90

    机械工业出版社

    删除

    云计算编程

    1003

    100

    科技出版社

    删除

    2)在Servlet中调用DAO类查询book表

    3)将得到的结果显示在页面上，增加删除链接

    4)显示时要求jsp中使用JSTL+EL输出结果

    5)写出DAO，Servlet和jsp核心代码即可

    DAO:

     1 public List<Book> getAll()
 2 {
 3     List<Book> lb = new ArrayList<Book>();
 4     String sql = "select * from book";
 5     Connection conn = new MyConnection().getConn();
 6     try {
 7         Statement st = conn.createStatement();
 8         ResultSet rs = st.executeQuery(sql);
 9         while(rs.next())
10         {
11             Book book = new Book();
12             book.setName(rs.getString("name"));
13             book.setNo(rs.getString("no"));
14             book.setPrice(rs.getDouble("price"));
15             book.setPublisher(rs.getString("publisher"));
16             lb.add(book);
17         }
18     } 
19     catch (SQLException e) 
20     {
21         e.printStackTrace();
22     }
23     return lb;
24 } 

    Servlet:

     1 public class GetBookServlet extends HttpServlet
 2 {
 3     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
 4             throws ServletException, IOException
 5     {
 6         this.doPost(req, resp);
 7     }
 8 
 9     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
10             throws ServletException, IOException
11     {
12         req.getRequestURI();
13         BookDAO dao = new BookDAO();
14         List<Book> lb = dao.getAll();
15         req.setAttribute("booklist", lb);
16         req.getRequestDispatcher("bookList.jsp").forward(req, resp);
17     }
18 }

    JSP:

     1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@
 3 taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 4 <html>
 5     <head>
 6         <title>书本列表</title>
 7     </head>
 8     <body>
 9         <table>
10             <tr>
11                 <td>Name</td>
12                 <td>NO</td>
13                 <td>Price</td>
14                 <td>Publisher</td>
15                 <td>操作</td>
16             </tr>
17             <c:forEach items="${booklist }" var="book">
18                 <tr>
19                     <td>${book.name }</td>
20                     <td>${book.no }</td>
21                     <td>${book.price }</td>
22                     <td>${book.publisher }</td>
23                     <td>
24                         <a href="delete?no=${book.no }">删除</a>
25                     </td>
26                 </tr>
27             </c:forEach>
28         </table>
29     </body>
30 </html>

    7.  以下出版社管理系统部分模块，按照要求实现对应功能代码。（9分）

    1)点击对应书本的删除联接，删除对应的图书信息

    Name

    NO

    Price

    Publisher

    操作

    Android开发基础

    1001

    80

    清华大学出版社

    删除

    Core Java

    1002

    90

    机械工业出版社

    删除

    云计算编程

    1003

    100

    科技出版社

    删除

    2)在Servlet中接收要删除的图书NO，并调用DAO类中的删除方法传入

    3)删除操作完成后，转发到查询请求

    4)写出DAO，Servlet，web.xml和jsp核心代码即可

    HTML:

     1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%@
 3 taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
 4 <html>
 5     <head>
 6         <title>书本列表</title>
 7     </head>
 8     <body>
 9         <table>
10             <tr>
11                 <td>Name</td>
12                 <td>NO</td>
13                 <td>Price</td>
14                 <td>Publisher</td>
15                 <td>操作</td>
16             </tr>
17             <c:forEach items="${booklist }" var="book">
18                 <tr>
19                     <td>${book.name }</td>
20                     <td>${book.no }</td>
21                     <td>${book.price }</td>
22                     <td>${book.publisher }</td>
23                     <td>
24                         <a href="delete?no=${book.no }">删除</a>
25                     </td>
26                 </tr>
27             </c:forEach>
28         </table>
29     </body>
30 </html> 

    Web.xml:

    1 <servlet>
2     <servlet-name>delete</servlet-name>
3     <servlet-class>com.guangsoft.servlet.DeleteBookServlet</servlet-class>
4 </servlet>
5 <servlet-mapping>
6     <servlet-name>delete</servlet-name>
7     <url-pattern>/delete</url-pattern>
8 </servlet-mapping>

    Servlet:

     1 protected void doPost(HttpServletRequest req, HttpServletResponse resp)
 2         throws ServletException, IOException 
 3 {
 4     req.setCharacterEncoding("utf-8");
 5     String no = req.getParameter("no");
 6     BookDAO dao = new BookDAO();
 7     boolean b = dao.deleteBook(no);
 8     if(b)
 9     {
10         req.getRequestDispatcher("getAll").forward(req, resp);
11     }
12     else
13     {
14         req.setAttribute("message","删除编号是"+no+"的书失败");
15         req.getRequestDispatcher("error.jsp").forward(req, resp);
16     }
17 }

    DAO:

     1 public boolean deleteBook(String no)
 2 {
 3     boolean b = false;
 4     try 
 5     {
 6         MyConnection mcon = new MyConnection();
 7         Connection conn = mcon.getConn();
 8         String sql = "delete from book where no='"+no+"'";
 9         System.out.println(sql);
10         Statement st = conn.createStatement();
11         st.executeUpdate(sql);
12         b = true;
13         mcon.closeConn(conn);
14     }
15     catch (SQLException e) 
16     {
17         e.printStackTrace();
18     }
19     return b;
20 }

    8. 以下出版社管理系统部分模块，按照要求实现对应功能代码。（9分）

    1)点击“修改”或者“删除”实现对应的功能

    Name

    NO

    Price

    Publisher

    操作

    Android开发基础

    1001

    80

    清华大学出版社

       修改    删除

    Core Java

    1002

    90

    机械工业出版社

    修改    删除

    云计算编程

    1003

    100

    科技出版社

    修改    删除

    2)在Servlet中实现分发功能，即利用一个Servlet实现多个功能，减少重复代码

    3)查询，删除，修改，增加任意两个即可

    3)写出Servlet核心代码即可，使用method或者uri分析请求不限制

    Servlet:

     1 public class BookServlet extends HttpServlet
 2 {
 3     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
 4     throws ServletException, IOException 
 5     {
 6         this.doPost(req, resp);
 7     }       
 8     protected void doPost(HttpServletRequest req, HttpServletResponse resp)
 9             throws ServletException, IOException 
10     {
11         req.setCharacterEncoding("utf-8");
12         String uri = req.getRequestURI();
13         //在dopost方法中利用uri分发到不同的操作
14     if(uri.endsWith("getAll"))
15     {
16         this.getAll(req,resp);
17     }
18     else if(uri.endsWith("add"))
19     {
20         this.add(req, resp);
21     }
22     else if(uri.endsWith("delete"))
23     {
24         this.del(req, resp);
25     }
26 }

    DAO:

    1 protected void getAll(HttpServletRequest req, HttpServletResponse resp)
2         throws ServletException, IOException 
3 {
4     BookDAO dao = new BookDAO();
5     List<Book> lb = dao.getAll();
6     req.setAttribute("booklist",lb);
7     req.getRequestDispatcher("bookList.jsp").forward(req, resp);
8 } 

    JavaBean:       

     1 protected void del(HttpServletRequest req, HttpServletResponse resp)
 2         throws ServletException, IOException 
 3 {
 4     String no = req.getParameter("no");
 5     BookDAO dao = new BookDAO();
 6     boolean b = dao.deleteBook(no);
 7     if(b)
 8     {
 9         req.getRequestDispatcher("getAll").forward(req, resp);
10     }
11     else
12     {
13         req.setAttribute("message","删除编号是"+no+"的书失败");
14         req.getRequestDispatcher("error.jsp").forward(req, resp);
15     }
16 }

    Servlet中的对应方法: 

     1 protected void add(HttpServletRequest req, HttpServletResponse resp)
 2         throws ServletException, IOException 
 3 {
 4     req.setCharacterEncoding("utf-8");
 5     String name = req.getParameter("bookname");
 6     String no = req.getParameter("no");
 7     String price = req.getParameter("price");
 8     String publisher = req.getParameter("publisher");
 9     Book book = new Book();
10     book.setName(name);
11     book.setNo(no);
12     book.setPrice(price==null?0.0:Double.parseDouble(price));
13     book.setPublisher(publisher);
14     BookDAO dao = new BookDAO();
15     boolean b = dao.addBook(book);
16     if(b)
17     {
18         req.getRequestDispatcher("success.jsp").forward(req, resp);
19     }
20     else
21     {
22         req.getRequestDispatcher("error.jsp").forward(req, resp);
23     }
24 }

    9. 写出处理中文乱码的过虑器及配置

    要求：写出Filter核心代码，web.xml配置代码

    Web.xml:

     1 <filter>
 2     <filter-name>charset</filter-name>
 3     <filter-class>com.guangsoft.filter.CharsetEncodingFilter</filter-class>
 4     <init-param>
 5         <param-name>endcoding</param-name>
 6         <param-value>gb2312</param-value>
 7     </init-param>
 8 </filter>
 9 <filter-mapping>
10     <filter-name>charset</filter-name>
11     <url-pattern>/*</url-pattern>
12 </filter-mapping>

    Filter:

     1 public class CharsetEncodingFilter implements Filter 
 2 {
 3     private String encoding;
 4     public void init(FilterConfig filterconfig) throws ServletException 
 5     {
 6         this.encoding = filterconfig.getInitParameter("endcoding");
 7     }
 8     public void doFilter(ServletRequest req, ServletResponse resp,
 9             FilterChain chain) throws IOException, ServletException 
10     {
11         req.setCharacterEncoding(encoding);
12         chain.doFilter(req, resp);
13     }
14     public void destroy() 
15     {
16     }
17 }

    10.   写出记录在线人数功能的监听器

    要求：写出Listener核心代码，web.xml配置代码

    Web.xml:

    1 <listener>
2     <listener-class>com.guangsoft.filter.CountListener</listener-class>
3 </listener>

    Listener:

     1 public class CountListener implements HttpSessionListener
 2 {
 3     private ServletContext sc = null;
 4     public void sessionCreated(HttpSessionEvent se)
 5     {
 6         this.sc = se.getSession().getServletContext();
 7         Integer i = (Integer) this.sc.getAttribute("online");
 8         if (i == null)
 9             i = new Integer(0);
10         i = new Integer((i.intValue()) + 1);
11         this.sc.setAttribute("online", i);
12     }
13     public void sessionDestroyed(HttpSessionEvent httpsessionevent)
14     {
15         Integer i = (Integer) this.sc.getAttribute("online");
16         if (i == null)
17             i = new Integer(1);
18         i = new Integer((i.intValue()) - 1);
19         this.sc.setAttribute("online", i);
20     }
21 }

    11.   使用jquery完成邮件地址是否已经注册代码

    要求：写出jquery ajax和HTML核心代码

     1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <html>
 3     <head>
 4         <title>register</title>
 5         <script type="text/javascript" src="js/jquery-1.8.2.min.js"></script>
 6         <script type="text/javascript">
 7             function checkemail() {
 8             $.ajax({
 9             type : "GET", url : "checkemail",
10             dataType : "html", data : "userName=" + $("#email").val(),
11             success : function(msg) {
12             $("#showResult").html(msg);
13             $("#showResult").css("color", "red");
14             }
15             });
16             }
17         </script>
18     </head>
19     <body>
20         邮件注册:
21         <input type="text" id="email" onblur="checkemail()">
22             @163.com
23             <span id="message"></span>
24     </body>
25 </html>

     
  • 相关阅读:
    分布式系统基础设施
    6种负载均衡算法
    缓存类
    HTTP状态码100、200、300、400、500、600的含义
    Java中的多线程你只要看这一篇就够了(引用)
    An incompatible version 1.1.1 of the APR based Apache Tomcat Native library is installed, while Tomcat requires version 1.1.17
    EL表达式与JSTL(C)标签
    JSP标准标签库
    SpringMVC HttpMessageConverter 匹配规则
    springboot学习（三）——使用HttpMessageConverter进行http序列化和反序列化
  • 原文地址：https://www.cnblogs.com/guanghe/p/6061958.html
Copyright © 2020-2023  润新知