initlistener.java

运用jsp/servlet技术 通过bs方式 在网上购买MP3

package com.listener;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import com.dto.Mp3;
import com.dto.User;


public class InitListener implements ServletContextListener {

	private Map<String,User> userList;
	private Map<String,Mp3>  mp3List;
	public void contextDestroyed(ServletContextEvent arg0) {
		// TODO Auto-generated method stub

	}


	public void contextInitialized(ServletContextEvent arg0) {
	       ServletContext sc=arg0.getServletContext();
	       
	       InputStream userIn=sc.getResourceAsStream(sc.getInitParameter("userpath"));
	       userList=getUserList(userIn);
	       sc.setAttribute("userList", userList);
	       System.out.println("用户信息初始化完成");
	       InputStream mp3In=sc.getResourceAsStream(sc.getInitParameter("mp3path"));
	       mp3List=getMp3List(mp3In);
	       sc.setAttribute("mp3List", mp3List);
	       System.out.println("mp3信息初始化完成");
	}
	
	  private Map<String,Mp3> getMp3List(InputStream mp3In){
		  Map<String,Mp3> mp3List=new LinkedHashMap<String,Mp3>();
		  BufferedReader br=null;
		  
		  try {
			br=new BufferedReader(new InputStreamReader(mp3In));
			  String line=null;
			  while((line=br.readLine())!=null){
				  String[] datas=line.split("\\s+");
				  mp3List.put(datas[0] ,new Mp3(datas[0],datas[1],datas[2],datas[3],datas[4],datas[5]));
			  }
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		  finally{
			  if(br!=null){
				  try {
					br.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			  }
		  }
		  return mp3List;
	  }
     
	 private Map<String,User> getUserList(InputStream userIn){
		 Map<String, User> userList=new LinkedHashMap<String,User>();
		   BufferedReader br=null;
		   
		   try {
			br = new BufferedReader(new InputStreamReader(userIn));
			String line = null;
			while ((line = br.readLine()) != null) {
				String[] datas = line.split("\\s+");
				userList.put(datas[0], new User(datas[0], datas[1]));
			}
		    } catch (Exception e) {
		  	// TODO: handle exception
		    }
		   finally{
			   if(br!=null){
				   try {
					br.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			   }
		     }
		   return userList;
	 }
}