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MVC操作（30分）
听说考学生注册，那我就浅把用户注册改成学生注册
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）
学生注册：
1、jsp：
（1）addStudent.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>学生注册</h3><form action="StudentServlet" method="post">学生姓名：<input type="text" name="name" /><br/><br/>学生年龄：<input type="text" name="age" /><br/><br/><input type="submit" value="提交"/><input type="reset" value="重置"/></form></body>
</html>（2）addStudentSuccess.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>学生注册成功<br/>学生姓名：${requestScope.name}<br/>学生年龄：${requestScope.age}<br/><a href="addStudent.jsp">再次注册</a></body>
</html>2、javabean:
import java.sql.*;
public class StudentBean{private Integer id;private String name;private String age;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 getAge(){return age;} public void setAge(String age){this.age=age;} public boolean insortStudent(StudentBean student){Integer id=student.getId();String name=student.getName();String age=student.getAge();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 student(name,age)values(?,?)"PreparedStatement ps=conn.prepareStatement(sql);ps.setString(1,name);ps.setString(2,age);int result=ps.executeUpdate();if(result>0)return true;elsereturn false;}catch(Exception e){e.printStackTrace();}return false; }
}
3、servlet：
import java.io.IOException;
import javax.servlet.*;
import edu.tyut.bean.StudentServlet;
@WebServlet("/StudentServlet")
public class StudentServlet extends HttpServlet{protected void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{request.setCharacterEncoding("UTF-8");String name=request.getParameter("name");String age=request.getParameter("age");StudentBean student=new StudentBean();student.setName(name);student.setAge(age);boolean result=student.insortStudent(student);if(result)response.sendRedirect("addStudentSuccess.jsp");elseresponse.sendRedirect("addStudent.jsp");}protected void doPost(HttpServletRequest request,HttpServletResponse)throws ServletException,IOException{doGet(request,response);}
}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 true;elsereturn 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");elseresponse.sendRedirect("addMessage.jsp");}protected void doPost(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="select*from user where name=? and password=?";//这个loginUser（）方法我写的有些问题，先别参考PreparedStatement ps=conn.prepareStatement(sql);ps.setString(1,name);ps.setString(2,password);int result=ps.executeUpdate();if(result>0)return true;elsereturn 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.loginUser(user);if(result)response.sendRedirect("loginSuccess.jsp");elseresponse.sendRedirect("login.jsp");}protected void doPost(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
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