package?com.accp.houserent.filter;

import?java.io.BufferedReader;
import?java.io.BufferedWriter;
import?java.io.File;
import?java.io.FileReader;
import?java.io.FileWriter;
import?java.io.IOException;

import?javax.servlet.Filter;
import?javax.servlet.FilterChain;
import?javax.servlet.FilterConfig;
import?javax.servlet.ServletContext;
import?javax.servlet.ServletException;
import?javax.servlet.ServletRequest;
import?javax.servlet.ServletResponse;
import?javax.servlet.http.HttpServletRequest;

//過濾器類
public?class?EcondingFilter?implements?Filter?{
	private?String?charset?=?null;
	private?ServletContext?context?=?null;
	private?String?path?=?““;
	/**
	?*??在銷毀前將數據存入本地文件中
	?*/
	public?void?destroy（）?{
		//獲取servleContext中的屬性的那個值
		String?nums?=?（String）?context.getAttribute（“nums“）;
		//創建寫入流
		FileWriter?fw?=?null;
		BufferedWriter?bw?=?null;
		try?{
			fw?=?new?FileWriter（path）;
			bw?=?new?BufferedWriter（fw）;
			bw.write（nums）;
		}?catch?（Exception?e）?{
			e.printStackTrace（）;
		}?finally?{

			try?{
				if?（bw?!=?null）?{
					bw.close（）;
				}
				if?（fw?!=?null）?{
					fw.close（）;
				}
			}?catch?（IOException?e）?{
				//?TODO?Auto-generated?catch?block
				e.printStackTrace（）;
			}

		}
		System.out.println（“filter銷毀“）;
	}

	public?void?doFilter（ServletRequest?request?ServletResponse?response
			FilterChain?chain）?throws?IOException?ServletException?{
		//?TODO?Auto-generated?method?stub
		System.out.println（“doFilter前“）;
		String?path?=?（（HttpServletRequest）request）.getServletPath（）;//獲取每次訪問的action的相對路徑
		//判斷路徑，如果是登陸的，就讓保存的context里面的那個屬性加1
		if（path.endsWith（“/login.action“））{
			context.setAttribute（“nums“Integer.parseInt（context.getAttribute（“nums“）.toString（））+1+““）;
		}