您的位置：首页 > Web前端 > JavaScript

Jsp+Servlet+MyBatis完成分页查询

2016-06-17 16:37 288 查看

相应代码已经上传到csdn

http://download.csdn.net/detail/japanstudylang/9552720

1.建立如下图的结构

2.创建JSP文件

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'test05.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<center>
<table border="1">
<tr bgcolor="#ff0000">
<td>序号</td>
<td>姓名</td>
<td>年龄</td>
<td></td>
<td></td>
</tr>
<c:forEach items="${students}" var="a" varStatus="status">

<tr bgcolor="${status.index%2==0?'#ff66ff':'#77eedd' }">
<td>${a.id}</td>
<td>${a.name}</td>
<td>${a.age}</td>
<td><a href="MyModifyServlet?id=${a.id}">编辑</a></td>
<td><a href="MyDeleteServlet?id=${a.id}">删除</a></td>
</tr>

</c:forEach>
<tr>
<td colspan="5">
<form action="StudentServlet">
转到：<input type="text" name="page" value="${currentPage }" style="width: 50px;background-color: aqua;">页  总页数：${sumPage}
  当前页：${currentPage}
<input type="submit" value="确定">
</form>
</td>
</tr>

</table>
</center>
</body>
</html>

3.创建Servlet文件

package com.yw.servlet;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.yw.test12.Condition;

public class StudentServlet extends HttpServlet
{

/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request
*            the request send by the client to the server
* @param response
*            the response send by the server to the client
* @throws ServletException
*             if an error occurred
* @throws IOException
*             if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{

doPost(request, response);
}

/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request
*            the request send by the client to the server
* @param response
*            the response send by the server to the client
* @throws ServletException
*             if an error occurred
* @throws IOException
*             if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
{

response.setCharacterEncoding("utf-8");

String spage = request.getParameter("page");
System.out.println("spage=" + spage);
int page = 1;
if (spage != null)
{
try
{
page = Integer.parseInt(spage);
if(page<1)
{
throw new Exception();
}

}
catch (Exception e)
{
request.setAttribute("error", "page不合法");
request.getRequestDispatcher("student.jsp").forward(request, response);

}
}

String resource = "com/yw/test12/mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

SqlSession session = sqlSessionFactory.openSession(false);
try
{
System.out.println("=====动态SQL======");
Condition s1 = new Condition();
// s1.setName("%a%");
// s1.setName("");
s1.setStart((page - 1) * 3);// /////////////
s1.setCount(3);

List user = session.selectList("com.yw.test12.StudentMapper.findStudent", s1);
System.out.println(user);

// ArrayList s=(ArrayList)db.query("select * from user limit "+ (page-1)*3+",3");

System.out.println("s=" + user);
request.setAttribute("students", user);

// 数据库中的总记录数
List user2 = session.selectList("com.yw.test12.StudentMapper.findAllStudent");
int sumNumber = user2.size();
System.out.println("user2=" + user2);

// 计算总页数
int sumPage = sumNumber % 3 == 0 ? sumNumber / 3 : sumNumber / 3 + 1;

System.out.println("sumPage=" + sumPage);
System.out.println("page=" + page);

request.setAttribute("sumPage", sumPage);
request.setAttribute("currentPage", page);

request.getRequestDispatcher("student.jsp").forward(request, response);
}
finally
{
session.close();
}

}

}

4.修改MyBatis里面的映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.yw.test12.StudentMapper">

<select id="findStudent" resultType="com.yw.test12.Student"
parameterType="com.yw.test12.Condition">
SELECT * FROM user

<!-- <if test="name !=null or name !='' " > where name like #{name} </if> -->
limit #{start},#{count}

</select>

<select id="findAllStudent" resultType="com.yw.test12.Student">
SELECT * FROM user

</select>

</mapper>

5.web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>StudentServlet</servlet-name>
<servlet-class>com.yw.servlet.StudentServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>StudentServlet</servlet-name>
<url-pattern>/StudentServlet</url-pattern>
</servlet-mapping>

</web-app>

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航