servler+jsp+jdbc的分页简单案例(链接oracle)

package lesson08;

import java.util.List;

public class PageTools_1 {
/**
*
*
* @param curPage   页面传入的当前页
* @param totalCount   数据库查询的总记录数
* @param pageCount     每页显示的条数
*/
public PageTools_1(Integer curPage,Integer totalCount,Integer pageCount){
this.curPage=curPage;
this.totalCount=totalCount;
this.pageCount=pageCount==null?this.pageCount:pageCount;
//上一页
this.prePage=(curPage==1?1:curPage-1);
//总页数
this.totalPage=totalCount%this.pageCount==0?totalCount/this.pageCount:(totalCount/this.pageCount+1);
//下一页
this.nextPage=(curPage==totalPage)?totalPage:(curPage+1);
//数据库第几页每页显示的数据   开始索引和结束索引
this.startIndex=(curPage-1)*this.pageCount+1;
this.endIndex=curPage*this.pageCount;
}

/**
* 当前页(动态  由页面传递)
*/
private Integer curPage;
/**
* 上一页
* prePage=(curPage==1?1:curPage-1)
*
*/
private Integer prePage;
/**
* 下一页
* nextPage=(nextPage==totalPage)?totalPage:(curPage+1)
*
*
*/
private Integer nextPage;
//每页显示的条数
private Integer pageCount=10;
/**
* 总页数
* totalPage=(totalCount%pageCount==0?totalCount/pageCount:(totalCount/pageCount+1)
*
*/
private Integer totalPage;
//数据库的总记录数(数据库查询)
private Integer totalCount;
//每页的数据放入该集合中
private List date;

/**
* 数据库开始索引和结束索引
*
* startIndex=(curPage-1)*PageCount+1
* endIndex=curPage*pageCount
*
*/
private int startIndex;
private int endIndex;

public int getStartIndex() {
return startIndex;
}
public void setStartIndex(int startIndex) {
this.startIndex = startIndex;
}
public int getEndIndex() {
return endIndex;
}
public void setEndIndex(int endIndex) {
this.endIndex = endIndex;
}
public List getDate() {
return date;
}
public void setDate(List date) {
this.date = date;
}
public Integer getCurPage() {
return curPage;
}
public void setCurPage(Integer curPage) {
this.curPage = curPage;
}
public Integer getPrePage() {
return prePage;
}
public void setPrePage(Integer prePage) {
this.prePage = prePage;
}
public Integer getNextPage() {
return nextPage;
}
public void setNextPage(Integer nextPage) {
this.nextPage = nextPage;
}
public Integer getPageCount() {
return pageCount;
}
public void setPageCount(Integer pageCount) {
this.pageCount = pageCount;
}
public Integer getTotalPage() {
return totalPage;
}
public void setTotalPage(Integer totalPage) {
this.totalPage = totalPage;
}
public Integer getTotalCount() {
return totalCount;
}
public void setTotalCount(Integer totalCount) {
this.totalCount = totalCount;
}

//用来测试
public static void main(String[] args) {
int curPage=6;
int totalCount=27;
int pageCount=5;

PageTools_1 pt=new PageTools_1(curPage, totalCount, pageCount);
System.out.println(pt.getNextPage());
System.out.println(pt.getPrePage());
System.out.println(pt.getTotalPage());
System.out.println(pt.getStartIndex());
System.out.println(pt.getEndIndex());
}

}

package lesson08;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

public class OracleDbUtils_1 {
static Properties p=new Properties();
static{
//在bin目录去读jdbcmysql.properties文件
InputStream is=OracleDbUtils_1.class.getResourceAsStream("/jdbcoracle.properties");
try {
p.load(is);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public static Connection getConnection() throws Exception{
String url=p.getProperty("url"); //获取连接服务器的ip地址 端口 和数据库
String driverClass=p.getProperty("driverClass");//告诉jdbc使用的是什么数据库
String uname=p.getProperty("username");//使用哪个账号登录
String paw=p.getProperty("password");//登录密码
Class.forName(driverClass);//加载该类
Connection conn=DriverManager.getConnection(url,uname,paw);//登录
return conn;
}

public static List<Map> query(String sql) throws Exception{
Connection conn=getConnection();
PreparedStatement pst= conn.prepareStatem
d948
ent(sql);
ResultSet rs=pst.executeQuery();
// 获取包含有关 ResultSet 对象列信息的 ResultSetMetaData 对象
ResultSetMetaData rsmd=rs.getMetaData();
//获取列的总数
int columnCount=rsmd.getColumnCount();
List list=new ArrayList();
while(rs.next()){
Map map=new HashMap();
for(int i=1;i<=columnCount;i++){
//获取列名
String colName=rsmd.getColumnName(i);
//获取对应的值
String colValue=rs.getString(i);
//以键值对的方式存入map集合中
map.put(colName, colValue);
}
list.add(map);
}
return list;
}

public static void main(String[] args) throws Exception{
List<Map> result=query("select * from cc");
System.out.println(result);
}
}

url=jdbc:oracle:thin:@localhost:1521:orcl
driverClass=oracle.jdbc.OracleDriver
username=str
password=123456

package lesson08;

import java.util.List;
import java.util.Map;
/**
* javabean是MVC设计模式的模型层（Model）操作数据
*
* @author THINK
*2017年10月10日 下午9:18:53
*Mytable.java
*easyTop
*/
public class Mytable_1 {
public Integer getTableListCount(String name){
if(name==null){
name="";
}
int i=0;
//该sql语句按条件查询的总记录数
String sql="select count(rowid) as cr from dept1 where deptno like '%"+name+"%'";
try {
//调用OracleDbUtils_1类中的query()方法  查询sql语句
List<Map> result=OracleDbUtils_1.query(sql);
//result.get(0)：返回此列表中指定位置上的元素。   返回的是一个map集合      get("CR")： 返回指定键所映射的值
i= Integer.parseInt(result.get(0).get("CR").toString());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return i;
}

public PageTools_1 getTable(String name,Integer curPage) throws Exception{
if(name==null){
name="";
}
//按条件查询返回记录的总数
Integer totalCount=getTableListCount(name);
//创建PageTools_1对象  传入当前页   总记录数   每页显示的数量
PageTools_1 pt=new PageTools_1(curPage, totalCount, 100);
//sql语句查询每页显示的具体数据
List<Map> result=OracleDbUtils_1.query("select * from (select t.*,rownum rn from dept1 t where t.deptno like '%"+name+"%') where rn>="+pt.getStartIndex()+" and rn<="+pt.getEndIndex());
pt.setDate(result);
return pt;
}
}

package lesson08;

import java.io.IOException;

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

/**
* Servlet是MVC设计模式的控制层（Controller） 负责调度（javabean的创建   服务调用）
* 例子
*  1、获取表单的数据  调用javabean写入数据库
*  2、调用javabean获取数据库集合  将数据传递jsp视图中
*
*
*/
public class TableServleta extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public TableServleta() {
super();
// TODO Auto-generated constructor stub
}

Mytable_1 my=new Mytable_1();
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Integer curPageInt=1;
//从页面获取参数    获取查询的姓名
String name=request.getParameter("tt");
//获取当前页
String curPage=request.getParameter("curPage");
//页面用户可以输入指定的页数  ====获取指定页
String a=request.getParameter("gg");
if(a!=null){
curPageInt=Integer.parseInt(a);
}
else if(curPage!=null){
curPageInt=Integer.parseInt(curPage);
}
//调用Mytable_1类中 getTable() 方法   返回PageTools对象
PageTools_1 tableList=my.getTable(name,curPageInt);
//把PageTools对象   设在request作用域中
request.setAttribute("tableList", tableList);
request.getRequestDispatcher("/lesson08/tableView.jsp").forward(request, response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

}

<!-- jsp是MVC设计模式中的view层
主要是和用户进行交互（肉眼看到的界面） 只允许出现html标签  el表达式  标签
-->
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/TableServleta">
<input type="text" name="tt"/>
<input type="submit" value="搜索"/>
</form>
<table border="1px" width="100%">
<%-- 设置一个标记  用来判断列名只输出一次 --%>
<c:set var="i" value="2"></c:set>
<%-- 循环获取的list中的map集合 --%>
<c:forEach var="db" items="${requestScope.tableList.date }">
<%-- 当i等于2时进入 --%>
<c:if test="${pageScope.i==2}">
<tr>
<%-- 循环map集合获取键值对  并输出键 --%>
<c:forEach var="map" items="${pageScope.db }">
<th>${pageScope.map.key}</th>
</c:forEach>
</tr>
<%-- 修改i的值 --%>
<c:set var="i" value="3"></c:set>
</c:if>
<tr>
<%-- 循环map集合获取键值对  并输出值 --%>
<c:forEach var="map" items="${pageScope.db }">
<td>${pageScope.map.value}</td>
</c:forEach>
</tr>
</c:forEach>
<tr>
<td colspan="4">
<a href="${pageContext.request.contextPath }/TableServleta?curPage=1">首页</a>
<a href="${pageContext.request.contextPath }/TableServleta?curPage=${requestScope.tableList.prePage}">上一页</a>
<!-- 页数分页 -->
<!-- 页面显示5页 -->
<c:forEach var="i" begin="${requestScope.tableList.curPage}" end="${requestScope.tableList.curPage+4 }" step="1">
<c:if test="${pageScope.i<=requestScope.tableList.totalPage}">
<a href="${pageContext.request.contextPath }/TableServleta?curPage=${pageScope.i}"><input type="button" value="${pageScope.i}"/></a>
<c:if  test="${pageScope.i==(requestScope.tableList.curPage+4) &&(requestScope.tableList.curPage+4<requestScope.tableList.totalPage) }">
...
</c:if>
</c:if>
</c:forEach>
总页数 ${requestScope.tableList.totalPage}
<a href="${pageContext.request.contextPath }/TableServleta?curPage=${requestScope.tableList.nextPage}">下一页</a>
<a href="${pageContext.request.contextPath }/TableServleta?curPage=${requestScope.tableList.totalPage}">尾页</a>

<form action="${pageContext.request.contextPath }/TableServleta">
<input type="search" name="gg" value="${requestScope.tableList.curPage }" style="margin-left:10px;width:80px;"/><input type="submit" value="跳转"/>
</form>
</td>
</tr>
</table>
</body>
</html>