登录页面次数的统计
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
public class CountFileHandler {
public static void writeFile(String filename, long count) {
try {
PrintWriter out = new PrintWriter(new FileWriter(filename));
out.println(count);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static long readFile(String filename) {
File f = new File(filename);
long count = 0;
if (!f.exists()) {
writeFile(filename, 0);
}
try {
BufferedReader in = new BufferedReader(new FileReader(f));
count = Long.parseLong(in.readLine());
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (NumberFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
count=0;
}
return count;
}
public static String tranfrom(long count) {
String countNumber=""+count;
String newString="";
for (int i = 0; i < countNumber.length(); i++) {
newString=newString+"<img src='images\\"+countNumber.charAt(i)+".gif'>";
}
return newString;
}
}
2.计数网页.
<body>
<%
long count=CountFileHandler.readFile(request.getRealPath("/")+"count.txt");
count=count+1;
CountFileHandler.writeFile(request.getRealPath("/")+"count.txt",count);
%>
当前的访问次数为:<%=CountFileHandler.tranfrom(count) %>
</body>
步骤:1.先写 定义writeFile方法(String filename,long count)
PrintWriter out=new PrintWriter(new FileWriter(filename));
//输出次数
out.println(count);
//关闭输出流
out.close();
2.再读 定义readFile(String filename)
File f=new File(filename);
//如果为空的话.则输出为0
if(!f.exist())
{
writeFile(filename,0);
}
//读出文件
BufferedReader in= new BufferedReader(new FileReader(f));\
count=Long.parseLong(in.readline());
//最后返回
return count;