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详解基于MVC的数据查询模块进行模糊查询

程序员文章站 2022-05-20 17:24:41
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.testbea...

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<testbean> list = (list<testbean>)request.getattribute("list");
 if(list == null){
  list = new arraylist<testbean>();
 }

%>
<!doctype html>
<html lang="en">
<head>
 <meta charset="utf-8">
 <meta name="viewport"
   content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
 <meta http-equiv="x-ua-compatible" content="ie=edge">
 <title>document</title>
</head>
<body>
<form action="scoreservlet">
 name:<input type="text" name="name">
 <input type="submit" method="post">

 <table border="1px solid black">
  <tr>
   <th>id</th>
   <th>name</th>
  </tr>
<%
 for(int i = 0 ; i < list.size() ; i++){
  testbean record = list.get(i);
%>
  <tr>
   <td><%=record.getid()%></td>
   <td><%=record.getname()%></td>
  </tr>
<%
 }
%>
 </table>
</form>
</body>
</html>

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<testbean> findbyname(string name) throws classnotfoundexception,sqlexception{
  list<testbean> list = new arraylist<testbean>();
  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;
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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