话不多说，直接上码！！
javaee.sql
/*
Navicat Premium Data Transfer
Source Server : localhost_3306
Source Server Type : MySQL
Source Server Version : 80021
Source Host : localhost:3306
Source Schema : javaee
Target Server Type : MySQL
Target Server Version : 80021
File Encoding : 65001
Date: 17/12/2020 08:40:20
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for news_inf
-- ----------------------------
DROP TABLE IF EXISTS `news_inf`;
CREATE TABLE `news_inf` (
`news_id` int NOT NULL AUTO_INCREMENT,
`news_title` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
`news_price` int NULL DEFAULT NULL,
`news_df` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
`news_num` int NULL DEFAULT NULL,
PRIMARY KEY (`news_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 11 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of news_inf
-- ----------------------------
INSERT INTO `news_inf` VALUES (1, 'first', 52, '北京', 1);
INSERT INTO `news_inf` VALUES (2, 'second', 54, '', 2);
INSERT INTO `news_inf` VALUES (3, 'third', 45, NULL, 3);
INSERT INTO `news_inf` VALUES (4, 'fouth', 54, NULL, NULL);
INSERT INTO `news_inf` VALUES (5, 'fifth', NULL, NULL, 5);
INSERT INTO `news_inf` VALUES (6, 'sixth', NULL, NULL, NULL);
INSERT INTO `news_inf` VALUES (7, 'seven', 45, NULL, 7);
INSERT INTO `news_inf` VALUES (8, 'eight', 45, NULL, 8);
INSERT INTO `news_inf` VALUES (9, 'nine', 45, NULL, NULL);
INSERT INTO `news_inf` VALUES (10, 'tenth', 45, NULL, 9);
SET FOREIGN_KEY_CHECKS = 1;
java代码
package p1;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
public class SpiltPage {
//定义数据库连接对象和结果集对象
private Connection con = null;
private Statement stmt = null;
private ResultSet rs = null;
private ResultSetMetaData rsmd = null;
//SQL查询语句
private String sqlStr;
//总记录数目
private int rowCount = 0;
//所分的逻辑页数
private int pageCount = 0;
//每页显示的记录数目
private int pageSize = 0;
//设置参数值
public void setCon(Connection con) {
this.con = con;
if(null==this.con) {
System.out.println("Failure to get a connection");
}else {
System.out.println("Success to get a connection");
}
}
//初始化数据库表中的信息
public void initialize(String sqlStr,int pageSize,int ipage) {
int irows = pageSize*(ipage-1);
this.sqlStr = sqlStr;
this.pageSize = pageSize;
try {
stmt = this.con.createStatement();
rs = stmt.executeQuery(this.sqlStr);
if(null != rs) {
rs.last();
this.rowCount = rs.getRow();
rs.first();
this.pageCount = (this.rowCount-1)/this.pageSize+1;
}
this.sqlStr = sqlStr+" limit "+irows+","+pageSize;
stmt = this.con.createStatement();
rs = stmt.executeQuery(this.sqlStr);
rsmd = rs.getMetaData();
}catch(SQLException e) {
System.out.println("zcn数据库异常："+e.toString());
}
}
//将显示结果存到Vector
public Vector getPage() {
Vector vData = new Vector();
try {
if(null != rs) {
while(rs.next()) {
String[] sData = new String[5];
for(int j=0;j
words_list_javabean.jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@page import="java.sql.*" %>
<%@page import="java.io.*" %>
<%@page import="java.util.*" %>
<%@page import="p1.*"%>
<%!
//每页显示的记录数
int pageSize = 3;
String sqlStr="";
//当前页
int showPage=1;
//数据库用户名
String userName="root";
//数据库密码
String userPassword="123456";
//数据库的URL,包括连接数据库所使用的编码格式
String url="jdbc:mysql://localhost:3306/javaee?serverTimezone=UTC&useUnicode=true&characterEncoding=gbk";
//定义连接对象
Connection dbcon;
%>
<%
try{
//加载驱动程序
Class.forName("com.mysql.jdbc.Driver");
//获得数据库的连接对象
dbcon = DriverManager.getConnection(url,userName,userPassword);
}catch(SQLException e){
//打印出异常信息
System.out.println(e.toString());
}
//给pages中参数con赋值
pages.setCon(dbcon);
sqlStr="select * from news_inf order by news_id";
//查询数据表，获得查询结果
String strPage = null;
//获取跳转到的目的的页面
strPage = request.getParameter("showPage");
if(null == strPage){
showPage=1;
}else{
try{
showPage=Integer.parseInt(strPage);
}catch(NumberFormatException e){
showPage = 1;
}
if(showPage<1){
showPage=1;
}
}
pages.initialize(sqlStr, pageSize, showPage);
//获取要显示的数据集合
Vector vData = pages.getPage();
%>
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| 编号 |
标题 |
价格 |
产地 |
数量 |
<%
for(int i=0;i
| <%=sData[0]%> |
<%=sData[1]%> |
<%=sData[2]%> |
<%=sData[3]%> |
<%=sData[4]%> |
<%}%>
<%
//关闭数据库连接
dbcon.close();
%>
