使用MVC模式开发程序，完成数据的模糊查询

编写程序：使用MVC模式开发程序，完成数据的模糊查询。

要求：

（1）index.jsp用于输入要查询的数据。

（2）result.jsp:用于显示结果。

（3）queryServlet：用于验证数据、实例化JavaBean、调用连接数据库、控制页面跳转

（4）queryDAO：用于连接数据库及进行数据库的操作如：查询、删除、更改等

（5）Student：JavaBean用于数据的封装，方便将查询结果在servlet与jsp页面之间进行传递等

以上几个部分共同构成了MVC模式，JSP为MVC模式当中的V，Servlet为C，queryDAO与JavaBean合在一起为M。

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>



  
    
    
    
	
	
	    
	
	
	
  
  
  
    请输入要查询的内容：
    

    
    
    
  

<%@ page language="java" import="java.util.*,com.mars.*" pageEncoding="gb2312"%>



    


   查询结果如下：
   
   <%
   		ArrayList arrayList = (ArrayList)request.getAttribute("arrayList");
   		for(int i=0; i
   
   <%
   		}
   %>
   

   

   		
学号
   		
姓名
   		
年龄
   		
性别
   		
地址
   

   		
<%=student.getId()%>
   		
<%=student.getName()%>
   		
<%=student.getAge()%>
   		
<%=student.getSex()%>
   		
<%=student.getAddress()%>
   

  
    index.jsp
  
  
	
		 queryServlet 
		 com.mars.queryServlet 
	
	  
	
		queryServlet 
		/queryServlet 
	
  

package com.mars;

public class Student {
	private int id;
	private String name;
	private String sex;
	private int age;
	private String address;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
}

package com.mars;

import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.mars.QueryDAO;

public class queryServlet extends HttpServlet {

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("GBK");
		response.setCharacterEncoding("GBK");
		String name = request.getParameter("name");
		QueryDAO qd = new QueryDAO();
		ArrayList arrayList = qd.queryLike(name);
		request.setAttribute("arrayList", arrayList);
		request.getRequestDispatcher("/result.jsp").forward(request, response);
	}

}

package com.mars;

import java.sql.*;
import java.util.ArrayList;
import com.mars.Student;

public class QueryDAO {
	private Connection conn = null;

	public QueryDAO() {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection(
					"jdbc:mysql://localhost:3306/testmvc", "root", "root");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}

	public ArrayList queryLike(String name) {
		ArrayList arrayList = new ArrayList();
		String SQL = "select * from student where name like" + "'%" + name
				+ "%'" + "or address like " + "'%" + name + "%'";
		try {
			ResultSet resultSet = conn.createStatement().executeQuery(SQL);
			while (resultSet.next()) {
				Student student = new Student();
				student.setId(resultSet.getInt("id"));
				student.setName(resultSet.getString("name"));
				student.setAge(resultSet.getInt("age"));
				student.setSex(resultSet.getString("sex"));
				student.setAddress(resultSet.getString("address"));
				arrayList.add(student);
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return arrayList;
	}

	public static void close(Connection conn) {
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			conn = null;
		}
	}

	public static void close(Statement stmt) {
		if (stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			stmt = null;
		}
	}
}

drop database testmvc;
create database testmvc;
use testmvc;
create table student (
	id int not null primary key auto_increment,
	name varchar(10),
	age int,
	sex varchar(2),
	address varchar(50)
	);
		insert into student values(null,'张三',20,'男','北京市东城区天安门');
		insert into student values(null,'李四',21,'男','上海市东城区天安门');
		insert into student values(null,'王五',22,'男','天津市东城区天安门');
		insert into student values(null,'赵六',23,'男','南京市东城区天安门');
		insert into student values(null,'孙七',24,'男','福建省东城区天安门');
		insert into student values(null,'钱八',25,'男','长沙市东城区天安门');
		insert into student values(null,'刘九',26,'男','武汉市东城区天安门');