春季休息中的EOFException

Question

因此，我有一个DataStructure，我想在Spring应用程序中持久化。我就是这样初始化@bean的

@Configuration
public class MessageBrokerInitializer {

    @Bean
    public MessageBroker getMessageBroker(){

        FileInputStream fileInputStream;
        ObjectInputStream objectInputStream;
        MessageBroker broker = null;
        try {
            fileInputStream = new FileInputStream("./data/store.ser");
            objectInputStream = new ObjectInputStream(fileInputStream);
            broker = (MessageBroker) objectInputStream.readObject();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        return (broker == null) ? new MessageBroker(): broker;
    }



}

基本上，我试图读取一个文件，初始化我的对象，或者如果文件是空的，我想要更新数据结构。我不断地得到，

java.io.EOFException

我怎么才能让这件事发生。

Answer 1

可以通过检查EOFException中可以读取的字节数来避免objectInputStream.available()，如下所示：

@Configuration
public class MessageBrokerInitializer {

    @Bean
    public MessageBroker getMessageBroker(){

        FileInputStream fileInputStream;
        ObjectInputStream objectInputStream;
        MessageBroker broker = null;
        try {
            fileInputStream = new FileInputStream("./data/store.ser");

            if(fileInputStream.available() != 0) {
              objectInputStream = new ObjectInputStream(fileInputStream);
              broker = (MessageBroker) objectInputStream.readObject();
            } else {
              broker = new MessageBroker()
           }               
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return broker;
    }
}

你可以看上去像这里