java用户登陆数量统计

写文件版

package com.c.elmer.util.string;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.PrintWriter;

public class LoginCount {
	
	String count = "0";
	String filepath = "";
	
	public LoginCount(){
		
	}
	
	public LoginCount(String path){
		filepath = path;
		try{
			File file = new File(path);
			FileInputStream fi = new FileInputStream(file);
			DataInputStream dis = new DataInputStream(fi);
			count = dis.readLine();
			dis.close();
			fi.close();
			if(count == null || count.equals("")){
				count = "0";
			}
		}catch (Exception e) {
			addLoginCount();
			System.out.println("第一个用户登陆，新建用户登陆数统计文件:"+path);
		}
		
		
	}
	
	public String getLoginCount(){
		return count;
	}
	
	public String addLoginCount(){
		long _lcount = (long) Double.parseDouble(count);
		_lcount ++;
		count = _lcount + "";
		
		File file = new File(filepath);
		try{

			FileWriter fWriter = new FileWriter(file,false);
			PrintWriter pWriter = new PrintWriter(fWriter);
			
			pWriter.print(count);
			pWriter.close();
			fWriter.close();
		}catch (Exception e) {
			e.printStackTrace();
		}
		
		
		return count;
	}

}

使用：

System.out.println("第 "+new LoginCount(request.getRealPath("/")+"/logincount.txt").addLoginCount() +" 个用户登陆.");