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小脚本实现的分页实例代码（JSP）

2016-06-30 09:09 633 查看

1：首先创建数据库链接类，我的博客前面有源码

2：创建封装你要分页的那个数据库表的Bean

3：封装实现分页功能的功能Bean 具体代码见下：

import java.util.ArrayList;
import java.sql.*;

public class PageBean {

private int curPage = 1; //当前是第几页
private int maxPage; //一共有多少页
private int maxRowCount; //一共有多少行
public int rowsPerPage = 10; //每页多少行

Connection conn;
public ArrayList data;

public PageBean() throws Exception {
this.setPageBean();
}
public int getCurPage() {
return curPage;
}

public int getMaxPage() {
return maxPage;
}

public int getMaxRowCount() {
return maxRowCount;
}

public int getRowsPerPage() {
return rowsPerPage;
}

public void setCurPage(int curPage) {
this.curPage = curPage;
}

public void setMaxPage(int maxPage) {
this.maxPage = maxPage;
}

public void setMaxRowCount(int maxRowCount) {
this.maxRowCount = maxRowCount;
}

public void setRowsPerPage(int rowsPerPage) {
this.rowsPerPage = rowsPerPage;
}

//得到要显示于本页的数据
public PageBean getResult(String page) throws Exception {
try {
PageBean pageBean = new PageBean();
ArrayList list = new ArrayList();
int pageNum = Integer.parseInt(page);
Statement stmt = conn.createStatement();
String strSql = "select top " + pageNum * pageBean.rowsPerPage +
" * from employee";//改成你的表
ResultSet rset = stmt.executeQuery(strSql);
int i = 0;
while (rset.next()) {

//这里要和表的字段对应起来！！！！
Employee item=new Employee();
item.setEmp_id(rset.getString("emp_id"));
item.setFname(rset.getString("fname"));
item.setMinit(rset.getString("minit"));
item.setLname(rset.getString("lname"));
item.setJob_id(rset.getInt("job_id"));
item.setJob_lvl(rset.getInt("job_lvl"));
item.setPub_id(rset.getString("pub_id"));
item.setHire_date(rset.getString("hire_date"));
list.add(item);

i++;
}
ConnectionManager.closeResultSet(rset);
ConnectionManager.closeStatement(stmt);
pageBean.setCurPage(pageNum);
pageBean.data = list;
return pageBean;
} catch (Exception e) {
e.printStackTrace();
throw e;

}
}
//获取总行数
public int getAvailableCount() throws Exception {
int ret = 0;
conn = ConnectionManager.getConnection();
Statement stmt = conn.createStatement();
String strSql = "select * from employee";//改成你的表
ResultSet rset = stmt.executeQuery(strSql);
while (rset.next()) {
ret++;
}
return ret;
}
//初始化时对PageBean进行设置
public void setPageBean() throws Exception {

//得到总行数
this.setMaxRowCount(this.getAvailableCount());

if (this.maxRowCount % this.rowsPerPage == 0) { //根据总行数计算总页数
this.maxPage = this.maxRowCount / this.rowsPerPage;
} else {
this.maxPage = this.maxRowCount / this.rowsPerPage + 1;
}
}

}

4：建立中间中转的Servlet PageServlet：代码如下：

public void init() throws ServletException {
}

//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
try
{
PageBean page1=new PageBean();
PageBean page2=page1.getResult((String)request.getParameter("jumpPage"));

//把PageBean保存到request对象中。注意：viewpage.jsp里jsp:useBean id必须为才可以"page2"！！！
request.setAttribute("page2",page2);
}
catch(Exception e)
{
e.printStackTrace();
}

/**
*把视图派发到viewForum.jsp
*/
javax.servlet.RequestDispatcher dis=request.getRequestDispatcher("viewpage.jsp");
dis.forward(request,response);

}

5：现在建立现实JSP页面 viewpage.jsp:

<%@ page contentType="text/html; charset=GBK" import="java.util.*,pagetest.Employee" %>
<jsp:useBean id="page2" scope="request" class="pagetest.PageBean"/>
<script language="JavaScript" type="text/JavaScript">
function Jumping(){
document.PageForm.submit();
return ;
}

function gotoPage(pagenum){
document.PageForm.jumpPage.value = pagenum;
document.PageForm.submit();
return ;
}
</script>
<html>
<head>
<title>
分页功能
</title>
</head>
<body bgcolor="#ffffff">
<table border="1">
<%
String s=String.valueOf(page2.getCurPage());
try{
ArrayList list=page2.getResult(s).data;
for(int i=0;i<list.size();i++){
Employee emp=(Employee)list.get(i);
%>
<tr>
<td><%=emp.getEmp_id()%></td>
<td><%=emp.getFname()%></td>
<td><%=emp.getHire_date()%></td>
<td><%=emp.getJob_id()%></td>
<td><%=emp.getJob_lvl()%></td>
<td><%=emp.getLname()%></td>
<td><%=emp.getMinit()%></td>
<td><%=emp.getPub_id()%></td>
</tr>
<%
}
}catch(Exception e){}
%>
</table>
<%if(page2.getMaxPage()!=1){ %>
<form name="PageForm" action="pageservlet" method="post">
每页
<%=page2.rowsPerPage%>
行
共
<%=page2.getMaxRowCount()%>行

第
<%=page2.getCurPage()%>
页
共
<%=page2.getMaxPage()%>页
<BR>
<%
if (page2.getCurPage() == 1) {
out.print(" 首页 上一页");
}
else {
%>
<a HREF="javascript:gotoPage(1)">首页</A>
<a HREF="javascript:gotoPage(<%=page2.getCurPage()-1%>)">上一页</A>
<%}%>
<%
if (page2.getCurPage() == page2.getMaxPage()) {
out.print("下一页 尾页");
}
else {
%>
<a HREF="javascript:gotoPage(<%=page2.getCurPage()+1%>)">下一页</A>
<a HREF="javascript:gotoPage(<%=page2.getMaxPage()%>)">尾页</A>
<%}%>
转到第
<SELECT name="jumpPage" onchange="Jumping()">
<%
for (int i = 1; i <= page2.getMaxPage(); i++) {
if (i == page2.getCurPage()) {
%>
<OPTION selected value="<%=i%>"><%=i%> </OPTION>
<%} else {%>
<OPTION value="<%=i%>"><%=i%> </OPTION>
<%}
}%>
</SELECT>
页
</form>
<%}%>
</body>
</html>

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