MVC操作(30分)

编程题就是给你一个表,几个jsp页面的显示图,让你根据题意写出MVC编码

其中,MVC包含了3部分:

1、视图(V)——编写jsp页面(HTML、CSS代码)

2、模型(M)——编写javabean.java(字符串处理、数据库操作)

3、控制器(C)——编写servlet.java(封装对HTTP请求的处理)

主要出的题型就这么几类:用户注册、用户登录、用户留言、图书管理

题目简单的话,只会要求我们补充MVC,难一点的话会让我们写全部的MVC,这次大题30分,估计难一点

大家能理解的理解,理解不了就背下来(都是手打的代码,难免出错,出错的代码段大家评论区告我)

用户留言: 

1、jsp:

(1)addMessage.jsp:
<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8" %> <html> <head> <title>网页左上角要写的标题</title> </head> <body>
<h3>用户留言</h3> <form action="MessageServlet" method="post"> 昵称:<input
type="text" name="nickname" /><br/><br/> 主题:<input type="text" name="title"
/><br/><br/> 内容:<br/> <textarea rows="5" cols="25"
name="content"></textarea><br/><br/> <input type="submit" value="留言"/> <input
type="reset" value="重置"/> </form> </body> </html>
(2)addMessageSuccess.jsp:
<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8" %> <html> <head> <title>网页左上角要写的标题</title> </head> <body>
<h3>添加留言成功!<a href="addMessage.jsp">再次留言</a></h3> </body> </html>
2、javabean:
import java.sql.*; public class MessageBean{ private Integer id; private
String nickname; private String title; private String content; public Integer
getId(){ return id; } public void setId(Integer id){ this.id=id; } public
String getNickname(){ return nickname; } public void setNickname(String
nickname){ this.nickname=nickname; } //......剩下的getter和setter方法省略,考试自己写上 public
boolean addMessage(MessageBean message){ Integer id=message.getId(); String
title=message.getTitle(); //......剩下两个省略,考试写 try{
Class.forName("com.mysql.jdbc.Driver"); String
url="jdbc:mysql://localhost:3306/jdbc1"; Connection
conn=DriverManager.getConnection(url,"root","123"); String sql="insert into
message(nickname,title,content)values(?,?,?)" PreparedStatement
ps=conn.prepareStatement(sql); ps.setString(1,nickname); ps.setString(2,title);
ps.setString(3,content); int result=ps.executeUpdate(); if(result>0) return
turn; else return false; }catch(Exception e) {e.printStackTrace();} return
false; } } }
3、servlet:
import java.io.IOException; import javax.servlet.*; import
edu.tyut.bean.MessageBean; @WebServlet("/MessageServlet") public class
MessageServlet extends HttpServlet{ protected void doGet(HttpServletRequest
request,HttpServletResponse response)throws ServletException,IOException{
request.setCharacterEncoding("UTF-8"); String
nickname=request.getParameter("nickname"); String
title=request.getParameter("title"); String
content=request.getParameter("content"); MessageBean message=new MessageBean();
message.setNickname(nickname); message.setTitle(title);
message.setContent(content); boolean result=message.addMessage(message);
if(result) response.sendRedirect("addMessageSuccess.jsp"); else
response.sendRedirect("addMessage.jsp"); } protected void
doGet(HttpServletRequest request,HttpServletResponse)throws
ServletException,IOException{ doGet(request,response); } }
用户注册:

1、jsp:

(1)register.jsp:
<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8" %> <html> <head> <title>网页左上角要写的标题</title> </head> <body>
<h3>用户注册</h3> <form action="RegisterServlet" method="post"> 用户名:<input
type="text" name="name" /><br/><br/> 密码:<input type="text" name="password"
/><br/><br/> <input type="submit" value="提交"/> <input type="reset" value="重置"/>
</form> </body> </html>
(2)welcome.jsp:
<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8" %> <html> <head> <title>网页左上角要写的标题</title> </head> <body>
<h3>注册成功<a href="register.jsp">再次注册</a></h3> </body> </html>
2、javabean:
import java.sql.*; public class UserBean{ private Integer id; private String
name; private String password; public Integer getId(){ return id; } public void
setId(Integer id){ this.id=id; } public String getName(){ return name; } public
void setName(String name){ this.name=name; } public String getPassword(){
return password; } public void setPassword(String password){
this.password=password; } public boolean insortUser(UserBean user){ Integer
id=user.getId(); String name=user.getName(); String
password=user.getPassword(); try{ Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/jdbc1"; Connection
conn=DriverManager.getConnection(url,"root","123"); String sql="insert into
user(name,password)values(?,?)" PreparedStatement
ps=conn.prepareStatement(sql); ps.setString(1,name); ps.setString(2,password);
int result=ps.executeUpdate(); if(result>0) return turn; else return false;
}catch(Exception e) {e.printStackTrace();} return false; } } }
3、servlet:
import java.io.IOException; import javax.servlet.*; import
edu.tyut.bean.RegisterServlet; @WebServlet("/RegisterServlet") public class
RegisterServlet extends HttpServlet{ protected void doGet(HttpServletRequest
request,HttpServletResponse response)throws ServletException,IOException{
request.setCharacterEncoding("UTF-8"); String
name=request.getParameter("name"); String
password=request.getParameter("password"); UserBean user=new UserBean();
user.setName(name); user.setPassword(password); boolean
result=user.register(user); if(result) response.sendRedirect("welcome.jsp");
else response.sendRedirect("register.jsp"); } protected void
doGet(HttpServletRequest request,HttpServletResponse)throws
ServletException,IOException{ doGet(request,response); } }
 用户登录:

1、jsp:

(1)login.jsp:
<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8" %> <html> <head> <title>网页左上角要写的标题</title> </head> <body>
<h3>用户登录</h3> <form action="LoginServlet" method="post"> 用户名:<input type="text"
name="name" /><br/><br/> 密码:<input type="text" name="password" /><br/><br/>
<input type="submit" value="登录"/> <input type="reset" value="重置"/> </form>
</body> </html>
(2)

loginSuccess.jsp:
<%@ page language="java" contentType="text/html;charset=UTF-8"
pageEncoding="UTF-8" %> <html> <head> <title>网页左上角要写的标题</title> </head> <body>
<h3>登录成功<a href="login.jsp">再次注册</a></h3> </body> </html>
2、javabean:
import java.sql.*; public class UserBean{ private Integer id; private String
name; private String password; public Integer getId(){ return id; } public void
setId(Integer id){ this.id=id; } public String getName(){ return name; } public
void setName(String name){ this.name=name; } public String getPassword(){
return password; } public void setPassword(String password){
this.password=password; } public boolean loginUser(UserBean user){ Integer
id=user.getId(); String name=user.getName(); String
password=user.getPassword(); try{ Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/jdbc1"; Connection
conn=DriverManager.getConnection(url,"root","123"); String sql="insert into
user(name,password)values(?,?)" PreparedStatement
ps=conn.prepareStatement(sql); ps.setString(1,name); ps.setString(2,password);
int result=ps.executeUpdate(); if(result>0) return turn; else return false;
}catch(Exception e) {e.printStackTrace();} return false; } } }
3、servlet:
import java.io.IOException; import javax.servlet.*; import
edu.tyut.bean.LoginServlet; @WebServlet("/LoginServlet") public class
LoginServlet extends HttpServlet{ protected void doGet(HttpServletRequest
request,HttpServletResponse response)throws ServletException,IOException{
request.setCharacterEncoding("UTF-8"); String
name=request.getParameter("name"); String
password=request.getParameter("password"); UserBean user=new UserBean();
user.setName(name); user.setPassword(password); boolean
result=user.register(user); if(result)
response.sendRedirect("loginSuccess.jsp"); else
response.sendRedirect("login.jsp"); } protected void doGet(HttpServletRequest
request,HttpServletResponse)throws ServletException,IOException{
doGet(request,response); } }
整体看下来,其实MVC的题型大同小异,我们只需要根据题意,将几个必要的参数修改即可

 

 

技术
友情链接
码工具
Toolsou
API参考文档
云服务器优惠
阿里云优惠券
腾讯云优惠券
华为云优惠券
站点信息
问题反馈
邮箱:ixiaoyang8@qq.com
QQ群:766591547
关注微信