<%@ page contentType="text/html;charset=GBK" %>
<%@ page language="java" import="java.sql.*"%>
<%@ page import="java.lang.Math.*" %>
<jsp:useBean id="conn" scope="page" class="test.ConnSQL"/>
<%!
ResultSet rs = null;
ResultSet rsTmp = null;
String sql = "";
int PageSize = 30;
int Page = 3;
int totalPage = 1;
String str = "";
%>
<%!
public String ShowOnePage(ResultSet rs, int Page, int PageSize) {
str = "";
// 先将记录指针定位到相应的位置
try {
rs.absolute( (Page-1) * PageSize + 1);
}catch(SQLException e) {
}
for(int iPage=1; iPage<=PageSize; iPage++) {
str += RsToGbook(rs );
try {
if(!rs.next()) break;
}catch(Exception e) {}
}
return str;
}
// 显示单行记录子模块
public String RsToGbook( ResultSet rs ) {
String tt = "";
try {
tt += "<TR>";
tt += "<TD>" + rs.getString("Trans_Name") + "</TD>";
tt += "<TD>" + rs.getString("dst_termid") + "</TD>";
tt += "<TD>" + rs.getString("src_termid") + "</TD>";
tt += "<TD>" + rs.getString("msg_content") + "</TD>";
tt += "</TR>";
}catch(SQLException e) {}
return tt;
}
%>
<% String begintime=request.getParameter("beginDate");
String endtime=request.getParameter("endDate");
sql = "select * from Teci_chat_mt where insert_time between '"+begintime+"'"+"and '"+endtime+"'";
try {
rs = conn.executeQuery( sql );
}catch(Exception e) {
out.println("访问数据库出错!");
}
%>
<html>
<head>
<title>业务分页显示</title>
</head>
<body bgcolor="#FFFFFF">
<h2 ALIGN="CENTER">业务分页显示</h2>
<hr>
<center>
<table border>
<TR bgcolor=lightblue>
<TH>业务名称</TH>
<TH>用户号码</TH>
<TH>网关</TH>
<TH>内容</TH>
</TR>
<%
rsTmp = conn.executeQuery("select count(*) as mycount from Teci_chat_mt where insert_time between '"+begintime+"'"+"and '"+endtime+"'";
rsTmp.next();
int totalrecord = rsTmp.getInt("mycount");
if(totalrecord % PageSize ==0) totalPage = totalrecord / PageSize; // 如果是当前页码的整数倍
else totalPage = (int) Math.floor( totalrecord / PageSize ) + 1; // 如果最后还空余一页
if(totalPage == 0) totalPage = 1;
rsTmp.close();
try {
if(request.getParameter("Page")==null || request.getParameter("Page").equals(""))
Page = 1;
else
Page = Integer.parseInt(request.getParameter("Page"));
} catch(java.lang.NumberFormatException e) { // 捕获用户从浏览器地址拦直接输入Page=sdfsdfsdf所造成的异常
Page = 1;
}
if(Page < 1) Page = 1;
if(Page > totalPage) Page = totalPage;
out.println(ShowOnePage(rs, Page, PageSize));
%>
</table>
<form Action="pagev3.jsp" Method="GET">
<%
if(Page != 1) {
out.println("<A HREF=pagev3.jsp?Page=1>第一页</A>");
out.println("<A HREF=pagev3.jsp?Page=" + (Page-1) + ">上一页</A>");
}
if(Page != totalPage) {
out.println("<A HREF=pagev3.jsp?Page=" + (Page+1) + ">下一页</A>");
out.println("<A HREF=pagev3.jsp?Page=" + totalPage + ">最后一页</A>");
}
rs.close();
%>
<p>输入页数:<input TYPE="TEXT" Name="Page" SIZE="3"> 页数:<font COLOR="Red"><%=Page%>/<%=totalPage%></font>
</p>
</form>
</center>
<hr>
</body>
</html>
这是我的总页面,在点击下一页的时候,显示的内容仍然是第一页显示的内容,我的bean是这样de:
package test;
import java.sql.*;public class ConnSQL
{ Connection con=null;
Statement sql=null;
ResultSet rs=null; public ConnSQL()
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{
System.err.println(e.getMessage());
}
} public ResultSet executeQuery(String s)
{
try
{
con = DriverManager.getConnection("jdbc:odbc:linkdatabase", "sa", "16898758");
sql = con.createStatement();
rs = sql.executeQuery(s);
}
catch(SQLException sqlexception)
{
System.err.println(sqlexception.getMessage());
}
return rs;
} public int executeUpdate(String s)
{
int i = 0;
try
{
con = DriverManager.getConnection("jdbc:odbc:linkdatabase", "sa", "16898758");
sql = con.createStatement();
i = sql.executeUpdate(s);
}
catch(SQLException sqlexception)
{
System.err.println(sqlexception.getMessage());
}
return i;
}
}请大家帮帮忙
<%@ page language="java" import="java.sql.*"%>
<%@ page import="java.lang.Math.*" %>
<jsp:useBean id="conn" scope="page" class="test.ConnSQL"/>
<%!
ResultSet rs = null;
ResultSet rsTmp = null;
String sql = "";
int PageSize = 30;
int Page = 3;
int totalPage = 1;
String str = "";
%>
<%!
public String ShowOnePage(ResultSet rs, int Page, int PageSize) {
str = "";
// 先将记录指针定位到相应的位置
try {
rs.absolute( (Page-1) * PageSize + 1);
}catch(SQLException e) {
}
for(int iPage=1; iPage<=PageSize; iPage++) {
str += RsToGbook(rs );
try {
if(!rs.next()) break;
}catch(Exception e) {}
}
return str;
}
// 显示单行记录子模块
public String RsToGbook( ResultSet rs ) {
String tt = "";
try {
tt += "<TR>";
tt += "<TD>" + rs.getString("Trans_Name") + "</TD>";
tt += "<TD>" + rs.getString("dst_termid") + "</TD>";
tt += "<TD>" + rs.getString("src_termid") + "</TD>";
tt += "<TD>" + rs.getString("msg_content") + "</TD>";
tt += "</TR>";
}catch(SQLException e) {}
return tt;
}
%>
<% String begintime=request.getParameter("beginDate");
String endtime=request.getParameter("endDate");
sql = "select * from Teci_chat_mt where insert_time between '"+begintime+"'"+"and '"+endtime+"'";
try {
rs = conn.executeQuery( sql );
}catch(Exception e) {
out.println("访问数据库出错!");
}
%>
<html>
<head>
<title>业务分页显示</title>
</head>
<body bgcolor="#FFFFFF">
<h2 ALIGN="CENTER">业务分页显示</h2>
<hr>
<center>
<table border>
<TR bgcolor=lightblue>
<TH>业务名称</TH>
<TH>用户号码</TH>
<TH>网关</TH>
<TH>内容</TH>
</TR>
<%
rsTmp = conn.executeQuery("select count(*) as mycount from Teci_chat_mt where insert_time between '"+begintime+"'"+"and '"+endtime+"'";
rsTmp.next();
int totalrecord = rsTmp.getInt("mycount");
if(totalrecord % PageSize ==0) totalPage = totalrecord / PageSize; // 如果是当前页码的整数倍
else totalPage = (int) Math.floor( totalrecord / PageSize ) + 1; // 如果最后还空余一页
if(totalPage == 0) totalPage = 1;
rsTmp.close();
try {
if(request.getParameter("Page")==null || request.getParameter("Page").equals(""))
Page = 1;
else
Page = Integer.parseInt(request.getParameter("Page"));
} catch(java.lang.NumberFormatException e) { // 捕获用户从浏览器地址拦直接输入Page=sdfsdfsdf所造成的异常
Page = 1;
}
if(Page < 1) Page = 1;
if(Page > totalPage) Page = totalPage;
out.println(ShowOnePage(rs, Page, PageSize));
%>
</table>
<form Action="pagev3.jsp" Method="GET">
<%
if(Page != 1) {
out.println("<A HREF=pagev3.jsp?Page=1>第一页</A>");
out.println("<A HREF=pagev3.jsp?Page=" + (Page-1) + ">上一页</A>");
}
if(Page != totalPage) {
out.println("<A HREF=pagev3.jsp?Page=" + (Page+1) + ">下一页</A>");
out.println("<A HREF=pagev3.jsp?Page=" + totalPage + ">最后一页</A>");
}
rs.close();
%>
<p>输入页数:<input TYPE="TEXT" Name="Page" SIZE="3"> 页数:<font COLOR="Red"><%=Page%>/<%=totalPage%></font>
</p>
</form>
</center>
<hr>
</body>
</html>
这是我的总页面,在点击下一页的时候,显示的内容仍然是第一页显示的内容,我的bean是这样de:
package test;
import java.sql.*;public class ConnSQL
{ Connection con=null;
Statement sql=null;
ResultSet rs=null; public ConnSQL()
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e)
{
System.err.println(e.getMessage());
}
} public ResultSet executeQuery(String s)
{
try
{
con = DriverManager.getConnection("jdbc:odbc:linkdatabase", "sa", "16898758");
sql = con.createStatement();
rs = sql.executeQuery(s);
}
catch(SQLException sqlexception)
{
System.err.println(sqlexception.getMessage());
}
return rs;
} public int executeUpdate(String s)
{
int i = 0;
try
{
con = DriverManager.getConnection("jdbc:odbc:linkdatabase", "sa", "16898758");
sql = con.createStatement();
i = sql.executeUpdate(s);
}
catch(SQLException sqlexception)
{
System.err.println(sqlexception.getMessage());
}
return i;
}
}请大家帮帮忙
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.jsp.page.pagev3_jsp._jspService(pagev3_jsp.java:128)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)这是页面的抱错情况