propertiesutil.java

使用netbeans 开发的 java手机通讯录。 主要就是一般的手机通讯录的功能

package com.lovo.addressbook;


import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;

public class PropertiesUtil {
	private ObjectInputStream ois = null;
	private ObjectOutputStream oos = null;
	private List<User> lstUsers = new ArrayList<User>();
	private String fileName = null;
	
	public PropertiesUtil(String fileName){
                    this.fileName = fileName; 
	}
	
	@SuppressWarnings("unchecked")
	public  List<User> getUsers(){
		try {
			  ois = new ObjectInputStream(new FileInputStream(fileName));		
			  lstUsers =  (ArrayList<User>)ois.readObject();
			  ois.close();
		   }catch(FileNotFoundException e){
			   intRecord();
		  } catch (ClassNotFoundException e) {
			e.printStackTrace();
		  } catch (IOException e) {
			e.printStackTrace();		
		  }
		 return lstUsers;
   }
	
	public void save(User user){
		try {
			oos = new ObjectOutputStream(new FileOutputStream(fileName));
			int i;
			for( i = 0;i < lstUsers.size();i++){
				if(user.getNo().equals(lstUsers.get(i).getNo())){
					lstUsers.set(i, user);//修改
					break;
				}
			}
			if(i >= lstUsers.size()){
			    lstUsers.add(user);//新增
			}
			oos.writeObject(lstUsers);
			oos.flush();
			oos.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 若记录文件不存在,则初始化记录文件
	 */
	private void intRecord(){
		//创建文件
		File f = new File(fileName);
		try {
			f.createNewFile();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		//新建一条记录
		User u = new User();
		u.setNo("1");
		u.setName("输入用户名");
		u.setAge(0);
		u.setSex("M");
		u.setPhone("请输入电话号码");
		u.setImagePath("输入图片路径");
		try {
			oos = new ObjectOutputStream(new FileOutputStream(fileName));
			lstUsers.add(u);
			oos.writeObject(lstUsers);
                        oos.flush();
			oos.close();
                        JOptionPane.showMessageDialog(null, "请重启本程序");
                        System.exit(0);
		} catch (FileNotFoundException e1) {
			e1.printStackTrace();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}
}