IP地址计数器
原理：获取用户的IP地址，然后存入数据库，当再次访问时查询数据库是否存在该条数据，即可完成此程序
设计过程
创建一个连接数据库类：DB.java
package com.count.Online;
import java.sql.*;
public class DB {
private Connection con;
private Statement stm;
private ResultSet rs;
private final static String url = "jdbc:mysql://localhost:3306/oumyye";
private final static String dbDriver = "com.mysql.jdbc.Driver";
// 通过构造方法加载数据库驱动
static {
try {
Class.forName(dbDriver).newInstance();
} catch (Exception ex) {
System.out.println("数据库加载失败");
}
}
// 创建数据库连接
public Connection getCon() {
try {
con = DriverManager.getConnection(url,"root","root");
System.out.println(con);
con.setAutoCommit(true);
} catch (SQLException e) {
System.out.println(e.getMessage());
System.out.println("creatConnectionError!");
}
return con;
}
public Statement getStm(){
try{
con=getCon();
stm=con.createStatement();
}catch(Exception e){e.printStackTrace(System.err);}
return stm;
}
public Statement getStmed(){
try{
con=getCon();
stm=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
}catch(Exception e){e.printStackTrace(System.err);}
return stm;
}
public ResultSet search(String sql){
getStm();
try{
rs=stm.executeQuery(sql);
}catch(Exception e){e.printStackTrace();}
return rs;
}
public int dosql(String sql){
System.out.println(sql);
int i=-1;
getStm();
try{
i=stm.executeUpdate(sql);
}catch(Exception e){e.printStackTrace();}
return i;
}
public void closed(){
try{
if(rs!=null)rs.close();
}
catch(Exception e){e.printStackTrace();}
try{
if(stm!=null)stm.close();
}
catch(Exception e){e.printStackTrace();}
try{
if(con!=null)con.close();
}
catch(Exception e){e.printStackTrace();}
}
}
创建一个核心操作类CountOnline.java
package com.count.Online;
import java.sql.*;
public class CountOnline {
private String userip;
private String nowdate;
private int times;
private DB db=new DB();
public CountOnline(){}
public void setUserip(String userip){
this.userip=userip;
}
public String getUserip(){
return this.userip;
}
public void setNowdate(String nowdate){
this.nowdate=nowdate;
}
public String getNowdate(){
return this.nowdate;
}
public void setTimes(int times){
this.times=times;
}
public int getTimes(){
return this.times;
}
public ResultSet adduser(){
ResultSet rs=null;
String sql="insert into tb_IPcount values("+this.times+",‘"+this.userip+"‘,‘"+this.nowdate+"‘)";
try{
db.dosql(sql);
rs=db.search("select * from tb_IPcount");
}catch(Exception e){e.printStackTrace();}
return rs;
}
public void dbclose(){
db.closed();
}
}
用户访问的页面index.jsp
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.util.Date,java.text.*,java.sql.*" %>
<jsp:useBean id="mycount" class="com.count.Online.CountOnline"/>
<jsp:useBean id="mydb" class="com.count.Online.DB"/>
<%
SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
String sql="select MAX(user_order) from tb_IPcount as max";
ResultSet rs=mydb.search(sql);
rs.next();
int max=rs.getInt(1);
mydb.closed();
mycount.setTimes(max+1);
String ip=request.getRemoteAddr();
mycount.setUserip(ip);
String nowdate=format.format(new Date());
mycount.setNowdate(nowdate);
rs=mycount.adduser();
%>
<html>
<head>
<title>记录用户IP地址的计数器</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<center>
<table height="90" width="400" border="1" bordercolor="black" bordercolorlight="black" bordercolordark="white" cellspacing="0" style="margin-top:200">
<tr bgcolor="lightgrey">
<td align="center">第N位访问者</td>
<td align="center">访问者IP地址</td>
<td align="center">访问时间</td>
</tr>
<%
while(rs.next()){
%>
<tr>
<td align="center"><%=rs.getInt("user_order")%></td>
<td align="center"><%=rs.getString("user_ip")%></td>
<td align="center"><%=rs.getString("user_time")%></td>
</tr>
<%
}
mycount.dbclose();
%>
<tr>
<td align="center" colspan="3">
您是第<%=max+1%>位访问者！
<br>
您的IP为：<%=ip%>
<br>
您访问的时间为：<%=nowdate%>
</td>
</tr>
</table>
</center>
</body>
</html>
本程序使用的是mysql数据库，需导入mysql驱动包
数据库表结构
CREATE TABLE `tb_ipcount` ( `user_order` int(10) DEFAULT NULL, `user_ip` varchar(20) DEFAULT NULL, `user_time` varchar(20) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
对于此程序还可以添加一个新功能
计算出总共多少ip地址，每个ip地址的访问次数。
实例二
数据库连接代码如上
CountOnline.java
package com.count.Online;
import java.sql.*;
public class CountOnline {
private String userip;
private String nowdate;
private int times;
private DB db=new DB();
public CountOnline(){}
public void setUserip(String userip){
this.userip=userip;
}
public String getUserip(){
return this.userip;
}
public void setNowdate(String nowdate){
this.nowdate=nowdate;
}
public String getNowdate(){
return this.nowdate;
}
public void setTimes(int times){
this.times=times;
}
public int getTimes(){
return this.times;
}
public ResultSet checkuser(){
String sql="select * from tb_newusercount where user_ip=‘"+this.userip+"‘";
ResultSet rs=null;
try{
rs=db.search(sql);
if(rs.next()){
this.times=rs.getInt("user_times")+1;
sql="update tb_newusercount set user_times="+this.times+" where user_ip=‘"+this.userip+"‘";
db.dosql(sql);
}
else{
this.times=1;
sql="insert into tb_newusercount values(‘"+this.userip+"‘,1)";
db.dosql(sql);
}
rs=db.search("select * from tb_newusercount");
}catch(Exception e){e.printStackTrace();}
return rs;
}
public void dbclose(){
db.closed();
}
}
界面代码index.jsp
<%@ page contentType="text/html;charset=GBK"%>
<%@ page import="java.sql.*" %>
<jsp:useBean id="mycount" class="com.count.Online.CountOnline"/>
<%
String ip=request.getRemoteAddr();
mycount.setUserip(ip);
ResultSet rs=mycount.checkuser();
rs.last();
int num=rs.getRow();
%>
<html>
<head>
<title>只对新用户计数的计数器</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
<body>
<center>
<table height="90" width="200" border="1" bordercolor="black" bordercolorlight="black" bordercolordark="white" cellspacing="0" style="margin-top:200">
<tr bgcolor="lightgrey">
<td align="center">访问者IP地址</td>
<td align="center">访问次数</td>
</tr>
<%
rs.beforeFirst();
while(rs.next()){
%>
<tr>
<td align="center"><%=rs.getString("user_ip")%></td>
<td align="center"><%=rs.getInt("user_times")%></td>
</tr>
<%
}
%>
<tr>
<td align="center" colspan="2">
您的IP为：<%=ip%>
<br>
您的访问次数为：<%=mycount.getTimes()%>次
<br>
共有 <%=num%> 个新用户访问过本页
</td>
</tr>
</table>
<%
mycount.dbclose();
%>
</center>
</body>
</html>
时间： 2024-11-05 14:54:20