File的保存与读取

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class FileUtil {

    public FileUtil() {

    }

    public void save(String fileName, Object o) throws Exception {

        String path = SharedData.getAppDir();

        File dir = new File(path);
        dir.mkdirs();

        File f = new File(dir, fileName);

        if (f.exists()) {
            f.delete();
        }
        FileOutputStream os = new FileOutputStream(f);
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(os);
        objectOutputStream.writeObject(o);
        objectOutputStream.close();
        os.close();
    }

    public Object readObject(String fileName) throws Exception {
        String path = SharedData.getAppDir();

        File dir = new File(path);
        dir.mkdirs();
        File file = new File(dir, fileName);
        InputStream is = new FileInputStream(file);

        ObjectInputStream objectInputStream = new ObjectInputStream(is);

        Object o = objectInputStream.readObject();

        return o;

    }
}

存数据方法

public static void saveBaseData()
       {
            FileUtil fu = new FileUtil();
            try{
                fu.save("taocandishzuofa", tcdishzuofa);

            }catch(Exception e)
            {
                e.printStackTrace();
            }
       }

取数据方法

public static void readBaseData()
       {
           FileUtil fu = new FileUtil();
           try{

            tcdishzuofa = (ArrayList<TaoCanDishZuoFa>) fu.readObject("taocandishzuofa");

           }catch(Exception e)
           {
               e.printStackTrace();
           }
       }

最后在需要的地方调用就行了、