详解基于MVC的数据查询模块进行模糊查询

详解基于MVC的数据查询模块进行模糊查询

完成一个简单的基于MVC的数据查询模块，要求能够按照name进行模糊查询。

Index.jsp：

<%@ page import="student.TestBean" %>

<%@ page import="java.util.List" %>

<%@ page import="java.util.ArrayList" %>

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%

List list = (List)request.getAttribute("list");

if(list == null){

list = new ArrayList();

}

%>

content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">

NAME:

<%

for(int i = 0 ; i < list.size() ; i++){

TestBean record = list.get(i);

%>

<%

}

%>

ScoreServlet.java：

import student.TestBean;

import student.TestDb;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.sql.SQLException;

import java.util.List;

@WebServlet(name = "/ScoreServlet")

public class ScoreServlet extends HttpServlet {

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String strName = request.getParameter("Name");

if(strName == null)

strName = "";

TestDb testDb = new TestDb();

try {

List<TestBean> list = testDb.findByName(strName);

request.setAttribute("list",list);

request.getRequestDispatcher("index.jsp").forward(request,response);

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

TestBean.java：

package student;

public class TestBean {

private int id;

private String name;

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;

}

}

TestDb.java：

package student;

import student.TestBean;

import java.sql.*;

import java.util.ArrayList;

import java.util.List;

public class TestDb {

public List findByName(String Name) throws ClassNotFoundException,SQLException{

List list = new ArrayList();

String url="jdbc:h2:D:/temp/h2/mydb";

Class.forName("org.h2.Driver");

Connection conn = DriverManager.getConnection(url,"sa","");

PreparedStatement pstmt = conn.prepareStatement("select ID,NAME from TEST where name like ?");

pstmt.setString(1,"%"+Name+"%");

ResultSet rs = pstmt.executeQuery(); //执行查询

while(rs.next()){

TestBean record = new TestBean();

record.setId(rs.getInt(1));

record.setName(rs.getString(2));

list.add(record);

}

rs.close();

pstmt.close();

conn.close();

return list;

}

}

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