哪位朋友帮我写一个最简单的记数功能??/ jsp的记数器~~ 不知道能不能不用库。 用库能不能用access的库?~谢谢啊。` 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 //不知道能不能不用库。 用库能不能用access的库?~当然可以用数据库。到处都是例子了,贴个我自己写的(文件存储信息的)。jsp的实现,如果计数器文件不存在,将自动在jsp文件所在目录下自动创建:counter.jsp-----------------------------------------------------<%@ page contentType="text/html; charset=GBK" %><%response.setHeader("Pragma","No-cache");//HTTP 1.1response.setHeader("Cache-Control","no-cache");//HTTP 1.0response.setHeader("Expires","0");//防止被proxyrequest.setCharacterEncoding("GB2312");//设置编码%><html><head><title>计数器</title></head><body bgcolor="#ffffff"><h1>一个简单的计数器</h1><%try {java.io.FileReader fr=new java.io.FileReader(request.getRealPath("/")+"\\counter.txt");java.io.BufferedReader br = new java.io.BufferedReader(fr);String countno = br.readLine();if (countno == null) { java.io.FileWriter fw=new java.io.FileWriter(request.getRealPath("/")+"\\counter.txt"); java.io.PrintWriter pw=new java.io.PrintWriter(fw); pw.print("1"); pw.close(); fw.close();}else{out.println("本页面是第"+countno+"次被访问!!"); java.io.FileWriter fw=new java.io.FileWriter(request.getRealPath("/")+"\\counter.txt"); java.io.PrintWriter pw=new java.io.PrintWriter(fw); pw.print(String.valueOf(Integer.parseInt(countno)+1) ); pw.close(); fw.close();}}catch(Exception e){ java.io.FileWriter fw=new java.io.FileWriter(request.getRealPath("/")+"\\counter.txt"); java.io.PrintWriter pw=new java.io.PrintWriter(fw); pw.print("1"); out.println("本页面是第"+1+"次被访问!!"); pw.close(); fw.close();}%></body></html>Jsp+JavaBean的实现(就是把代码封装到Bean里去了 :)),如果计数器文件不存在,将自动在C:\下自动创建:Bean文件:counterbean.java------------------------------------------------------------package counter;import java.io.*;public class counterBean { private String filepath="C:\\";//默认设置到C盘根目录下 private String counter; public counterBean() { } public String getCounter() { try {java.io.FileReader fr=new java.io.FileReader(filepath+"\\counter.txt");java.io.BufferedReader br = new java.io.BufferedReader(fr);String countno = br.readLine();//out.println("本页面是第"+countno+"次被访问!!"); java.io.FileWriter fw=new java.io.FileWriter(filepath+"\\counter.txt"); java.io.PrintWriter pw=new java.io.PrintWriter(fw); pw.print(String.valueOf(Integer.parseInt(countno)+1) ); pw.close(); fw.close(); counter=String.valueOf(Integer.parseInt(countno)+1); return counter;}catch(Exception e){ try{ java.io.FileWriter fw=new java.io.FileWriter(filepath+"\\counter.txt"); java.io.PrintWriter pw=new java.io.PrintWriter(fw); pw.print("1"); // out.println("本页面是第1次被访问!!"); pw.close(); fw.close(); counter="1"; return counter; } catch(Exception ee){ counter="1"; return counter; }} } public void setCounter(String counter) { this.counter = counter; }}Jsp文件:counter.jsp---------------------------------------------------------<%@ page contentType="text/html; charset=GBK" %><html><head><title>计数器</title></head><jsp:useBean id="counter" scope="page" class="counter.counterBean" /><body bgcolor="#ffffff"><h1>一个简单的计数器</h1>已经有<%=counter.getCounter()%>人次访问这个页面了!!!</body></html> <%request.getSession(true); String driver= "org.gjt.mm.mysql.Driver";String url = "jdbc:mysql://localhost/fooldockdb";String userID= USERNAME ;String passwd= PASSWORD ;int OldCNT;int UserCNT;int Index;String UserIndex;String OldIndex;try{ Class.forName(driver); Connection con = DriverManager.getConnection(url,userID,passwd); Statement stmt = con.createStatement(); String query = "SELECT * FROM counter;"; ResultSet QRes = stmt.executeQuery(query); while(QRes.next()){ OldCNT = QRes.getInt("times"); UserCNT = OldCNT + 1; UserIndex= UserCNT+""; OldIndex=OldCNT+""; if(session.isNew()){ for(Index=0;Index<UserIndex.length();Index++){ out.println("<img src=counter/image/c"+UserIndex.charAt(Index)+".gif align=absmiddle>"); } QRes.close(); query = "UPDATE counter SET times =" + UserCNT; stmt.executeQuery(query); } else{ for(Index=0;Index<OldIndex.length();Index++){ out.println("<img src=counter/image/c"+OldIndex.charAt(Index)+".gif align=absmiddle>"); } QRes.close(); } con.close(); }}catch(SQLException e){ e.printStackTrace(); out.print("有错误");}%> 刚学jsp,Enumeration枚举为什么不能执行?? 使用common fileupload1.2和common io1.3实现文件上传,想做个功能,实现有同名文件提示是否覆盖 checkbox 的参数传递问题 如何做热门搜索? EncodingFilter中为何只初始化却在最后没有注销? 如何用JSP获取HTML标签的值 昨天去面试的题,没答出来,兄弟们看看。 请高手帮忙解决 我通过表单将客户端的文件传到服务端,请问如何在jsp中获得上传的文件内容,急!!! 我用IE6。0打开.chm文件,出现乱码,解决了多多给分。。。 给个JSP绘图的例子?? Web版进销存的困惑
jsp的实现,如果计数器文件不存在,将自动在jsp文件所在目录下自动创建:counter.jsp
-----------------------------------------------------
<%@ page contentType="text/html; charset=GBK" %>
<%
response.setHeader("Pragma","No-cache");//HTTP 1.1
response.setHeader("Cache-Control","no-cache");//HTTP 1.0
response.setHeader("Expires","0");//防止被proxy
request.setCharacterEncoding("GB2312");//设置编码
%>
<html>
<head>
<title>
计数器
</title>
</head>
<body bgcolor="#ffffff">
<h1>
一个简单的计数器
</h1>
<%
try {
java.io.FileReader fr=new java.io.FileReader(request.getRealPath("/")+"\\counter.txt");
java.io.BufferedReader br = new java.io.BufferedReader(fr);
String countno = br.readLine();
if (countno == null) {
java.io.FileWriter fw=new java.io.FileWriter(request.getRealPath("/")+"\\counter.txt");
java.io.PrintWriter pw=new java.io.PrintWriter(fw);
pw.print("1");
pw.close();
fw.close();
}
else{
out.println("本页面是第"+countno+"次被访问!!");
java.io.FileWriter fw=new java.io.FileWriter(request.getRealPath("/")+"\\counter.txt");
java.io.PrintWriter pw=new java.io.PrintWriter(fw);
pw.print(String.valueOf(Integer.parseInt(countno)+1) );
pw.close();
fw.close();
}}
catch(Exception e){
java.io.FileWriter fw=new java.io.FileWriter(request.getRealPath("/")+"\\counter.txt");
java.io.PrintWriter pw=new java.io.PrintWriter(fw);
pw.print("1");
out.println("本页面是第"+1+"次被访问!!");
pw.close();
fw.close();
}
%>
</body>
</html>Jsp+JavaBean的实现(就是把代码封装到Bean里去了 :)),
如果计数器文件不存在,将自动在C:\下自动创建:Bean文件:
counterbean.java
------------------------------------------------------------
package counter;
import java.io.*;public class counterBean { private String filepath="C:\\";//默认设置到C盘根目录下
private String counter; public counterBean() {
}
public String getCounter() {
try {
java.io.FileReader fr=new java.io.FileReader(filepath+"\\counter.txt");
java.io.BufferedReader br = new java.io.BufferedReader(fr);
String countno = br.readLine();//out.println("本页面是第"+countno+"次被访问!!");
java.io.FileWriter fw=new java.io.FileWriter(filepath+"\\counter.txt");
java.io.PrintWriter pw=new java.io.PrintWriter(fw);
pw.print(String.valueOf(Integer.parseInt(countno)+1) );
pw.close();
fw.close();
counter=String.valueOf(Integer.parseInt(countno)+1);
return counter;
}
catch(Exception e){
try{ java.io.FileWriter fw=new java.io.FileWriter(filepath+"\\counter.txt");
java.io.PrintWriter pw=new java.io.PrintWriter(fw);
pw.print("1");
// out.println("本页面是第1次被访问!!");
pw.close();
fw.close();
counter="1";
return counter;
}
catch(Exception ee){
counter="1";
return counter;
}
} }
public void setCounter(String counter) {
this.counter = counter;
}}Jsp文件:counter.jsp---------------------------------------------------------<%@ page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>
计数器
</title>
</head>
<jsp:useBean id="counter" scope="page" class="counter.counterBean" />
<body bgcolor="#ffffff">
<h1>
一个简单的计数器
</h1>
已经有<%=counter.getCounter()%>人次访问这个页面了!!!
</body>
</html>
request.getSession(true);
String driver= "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost/fooldockdb";
String userID= USERNAME ;
String passwd= PASSWORD ;
int OldCNT;
int UserCNT;
int Index;
String UserIndex;
String OldIndex;try{
Class.forName(driver);
Connection con = DriverManager.getConnection(url,userID,passwd);
Statement stmt = con.createStatement();
String query = "SELECT * FROM counter;";
ResultSet QRes = stmt.executeQuery(query);
while(QRes.next()){
OldCNT = QRes.getInt("times");
UserCNT = OldCNT + 1;
UserIndex= UserCNT+"";
OldIndex=OldCNT+"";
if(session.isNew()){
for(Index=0;Index<UserIndex.length();Index++){
out.println("<img src=counter/image/c"+UserIndex.charAt(Index)+".gif align=absmiddle>");
}
QRes.close();
query = "UPDATE counter SET times =" + UserCNT;
stmt.executeQuery(query);
}
else{
for(Index=0;Index<OldIndex.length();Index++){
out.println("<img src=counter/image/c"+OldIndex.charAt(Index)+".gif align=absmiddle>");
}
QRes.close();
}
con.close();
}
}
catch(SQLException e){
e.printStackTrace();
out.print("有错误");
}
%>