java io 写不进数据，读取一直是null

Question

 @SuppressWarnings("unchecked")
public void reader() throws IOException, ClassNotFoundException {
          file = new File("src/com/lzf/www/dao/1.txt");
            if (!file.exists()) {
                file.createNewFile();
            }
            ois = new ObjectInputStream(new FileInputStream(file));
            list = (List<Employee>) ois.readObject(); // 给list赋值
            ois.close();

        }

        /**
         * 写文件
         * @throws IOException
         * @throws ClassNotFoundException
         */
        public void writer() throws IOException, ClassNotFoundException {
            file = new File("src/com/lzf/www/dao/1.txt");
            if (!file.exists()) {
                file.createNewFile();
            }
            oos = new ObjectOutputStream(new FileOutputStream(file));

            for(Employee e:list){
                oos.writeObject(e.toString()+"\r\n"); // 将list值写进文件里去
            }        
            oos.flush();
            oos.close();
        }

Answer 1

file = new File("src/com/lzf/www/dao/1.txt");
if (!file.exists()) {
file.createNewFile();
}

读取不到文件就自己创建，创建的内容怎么可能不为空？一般是需要确定file不为空，读取到文件，如果找不到文件，直接抛异常即可。