java文件流操作

package common;

import java.io.*;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import entity.Commodity;

public class CommodityFile {
    public List<Commodity> read(){
        List<Commodity> commodities=new ArrayList<>();
        File file=new File("E:/commodities1.txt");
        FileInputStream fis=null;
        ObjectInputStream ois=null;
        //BufferedReader br=null;
        //InputStreamReader isr=null;
        try {
            file.createNewFile();
            fis=new FileInputStream(file);
            ois=new ObjectInputStream(fis);
            commodities=(List<Commodity>)ois.readObject();
            /*isr=new InputStreamReader(fis,"utf-8");
            br=new BufferedReader(isr);
            String s;
            while ((s=br.readLine())!=null){
                Commodity commoditie=new Commodity();
                String[] s1=s.split(" ");
                commoditie.setName(s1[0]);
                commoditie.setPrice(new BigDecimal(s1[1]));
                commoditie.setDetial(s1[2]);
                commodities.add(commoditie);
            }*/
        }catch (Exception e){
            e.printStackTrace();
        }
        finally {
            try {
                /*if(br!=null){
                    br.close();
                }if(isr!=null){
                    isr.close();
                }*/
                if(ois!=null){
                    ois.close();
                }
                if(fis!=null){
                    fis.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
        return commodities;
    }
    public void write(List<Commodity>commodities){
        /*StringBuffer sb=new StringBuffer();
        for (Commodity c:commodities){
            sb.append(c.getName()+" "+c.getPrice()+" "+c.getDetial()+"
");
        }*/
        File file=new File("E:/commodities1.txt");
        FileOutputStream fos=null;
        ObjectOutputStream oos=null;
        //OutputStreamWriter osw=null;
        //BufferedWriter bw=null;
        try {
            file.createNewFile();
            fos=new FileOutputStream(file);
            oos=new ObjectOutputStream(fos);
            oos.writeObject(commodities);
            /*osw=new OutputStreamWriter(fos,"utf-8");
            bw=new BufferedWriter(osw);
            bw.write(sb.toString());*/
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            /*if(bw!=null){
                try {
                    bw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(osw!=null){
                try {
                    osw.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }*/
            if(oos!=null){
                try {
                    oos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(fos!=null){
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}