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jsp操作数据库，并将结果分页显示

2015-07-13 20:45 555 查看

最近在学李兴华的javaweb，第五章课程实践内容：分页显示数据库查询结果（这个东西非常有用，虽然还没有完全掌握）

首先声明数据库用的是mysql

1.创建数据库->创建数据表emp 结构如下：

2.向emp中插入数据：

3.编写select_emp.jsp

<%@ page contentType="text/html" pageEncoding="utf-8"%>
<%@ page import="java.sql.*"%>
<html>
<head>
<title>雇员列表显示</title>
<script type="text/javascript">
function go(num){
document.getElementById("_cp").value = num;
document.spform.submit();
}
</script>
</head>
<body>
<%!
public static final String URL = "select_emp.jsp";
%>

<%!
public static final String DBDRIVER = "org.gjt.mm.mysql.Driver" ;
public static final String DBURL = "jdbc:mysql://localhost:3306/databasename" ;
public static final String DBUSER = "root" ;
public static final String DBPASS = "" ;
%>

<%
Connection conn = null ;
PreparedStatement pstmt = null ;
ResultSet rs = null ;
%>

<%
int currentPage = 3;
int lineSize = 3;
int allRecorders = 0;
int pageSize = 1;
int lsData[] = {1,3,5,7,9,10,15,20};
%>

<%
try{
currentPage = Integer.parseInt(request.getParameter("cp"));
lineSize = Integer.parseInt(request.getParameter("ls"));
}catch(Exception e){
System.out.println(e);
}
%>

<%
try{
Class.forName(DBDRIVER) ;
conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS) ;
String sql = "SELECT COUNT(empno) FROM emp" ;
pstmt = conn.prepareStatement(sql) ;
rs = pstmt.executeQuery() ;
if(rs.next()){
allRecorders = rs.getInt(1);
}
pageSize = (allRecorders+lineSize-1) / lineSize;
%>
<center><h1>雇员列表</h1></center>

<center>
<form name="spform" action="<%=URL%>" method="post">
<input type="button" value="首页" onclick="go(1)" <%=currentPage==1?"DISABLED":""%>>
<input type="button" value="上一页" onclick="go(<%=currentPage-1%>)" <%=currentPage==1?"DISABLED":""%>>
<input type="button" value="下一页" onclick="go(<%=currentPage+1%>)" <%=currentPage==pageSize?"DISABLED":""%>>
<input type="button" value="尾页" onclick="go(<%=pageSize%>)" <%=currentPage==pageSize?"DISABLED":""%>>
跳转到第<select name="selcp" onchange="go(this.value)">
<%
for(int x=1;x<=pageSize;x++){
%>
<option value="<%=x%>" <%=x==currentPage?"SELECTED":""%>><%=x%></option>
<%
}
%>
</select>页
每页显示
<select name="ls" onchange="go(1)">
<%
for(int x=0;x<lsData.length;x++){
%>
<option value="<%=lsData[x]%>" <%=lsData[x]==lineSize?"SELECTED":""%>><%=lsData[x]%></option>
<%
}
%>
</select>
条
<input type="hidden" id="_cp" name="cp" value="1">
</form>
</center>

<center>
<table border="1" cellpadding="5" cellspacing="0" width="80%" bordercolor="#bbbbbb">
<tr>
<th>雇员编号</th>
<th>雇员姓名</th>
<th>雇员工作</th>
<th>雇员工资</th>
<th>雇佣日期</th>
</tr>

<%
sql = "select * from emp where empno<? and empno>=?";
pstmt = conn.prepareStatement(sql) ;
pstmt.setInt(1,6060+currentPage * lineSize) ;
pstmt.setInt(2,6060+(currentPage-1) * lineSize) ;
rs = pstmt.executeQuery() ;
%>

<%
while(rs.next()){
int empno = rs.getInt(1) ;
String ename = rs.getString(2) ;
String job = rs.getString(3) ;
Date date = rs.getDate(4) ;
double sl = rs.getDouble(5) ;
%>
<tr>
<td><%=empno%></td>
<td><%=ename%></td>
<td><%=job%></td>
<td><%=sl%></td>
<td><%=date%></td>
</tr>
<%
}
%>
</table>
</center>
<%
}catch(Exception e)	{
System.out.println(e) ;
}finally{
rs.close() ;
pstmt.close() ;
conn.close() ;
}
%>
</body>
</html>

4.实现效果：

希望对学习javaweb的伙伴们有所帮助。

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