Spring REST中的java EOFEException

Question

因此，我有一个数据结构，我想在我的SpringREST应用程序中保留它。 这就是我如何初始化@bean

@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来初始化我的对象，或者如果文件是空的，我想重新创建数据结构。我一直在

java.io.EOFException

我怎样才能让它工作呢

Answer 1

通过检查objectInputStream.available()可读取的字节数，可以避免EOFException，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;
    }
}

你可以看看here