EOFException 初始化 ObjectInputStream

EOFException initializing an ObjectInputStream

我是新来的,只会一点英语。嗯,我的问题是我必须做一个多线程服务器和一个客户端 class 来将很多客户端与一台服务器通信。我将我的客户保存在哈希图中,在添加到哈希图中后,我使用一种方法写入文件(HashMap 是可序列化的,我使用单例模式使哈希图全局化)。问题是当我尝试从我的文件中读取时,Java 抛出一个 EOFException 并且我不知道为什么。

这是我的代码:

import java.io.*;
import java.util.*;

public class MapaClients implements java.io.Serializable  {

private static MapaClients mapa= new MapaClients();

private Map<String,Client> clients= new HashMap<String,Client>();

private MapaClients(){}

public static MapaClients getInstance(){
    return mapa;
}

public void afegirMapa(String correu, Client client){
    clients.put(correu, client);
}

public Client existeix(String correu){
    if(clients.containsKey(correu)){
        return(clients.get(correu));
    }else{
        return(null);
    }
}

public void serializableGuardar(){
    try {
         FileOutputStream fileOut =new FileOutputStream("client.ser");
         ObjectOutputStream out = new ObjectOutputStream(fileOut);
         out.writeObject(mapa);
         out.close();
         fileOut.close();
         System.out.printf("Serialized data is saved in client.ser");
      } catch (IOException i) {
         i.printStackTrace();
      }
}

public void desserializableCarregar(){
    ObjectInputStream in;
      try {
         FileInputStream fileIn = new FileInputStream("client.ser");
         in = new ObjectInputStream(fileIn);
         boolean check=true;
         while (check) {
            try{
                mapa = (MapaClients) in.readObject();
            } catch(EOFException ex){
                in.close();
                check=false;
            }
         }
         in.close();
         fileIn.close();
      } catch (IOException i) {
         i.printStackTrace();
      } catch (ClassNotFoundException c) {
         c.printStackTrace();
      }
}

public void actualizar(Client client){
    clients.replace(client.getCorreu(), client);
}
}

问题出在这里:

in = new ObjectInputStream(fileIn);

这是例外情况:

java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.<init>(Unknown Source)
at Proves.MapaClients.desserializableCarregar(MapaClients.java:46)

我希望你能帮助我,对不起我的英语:)

您正在尝试从空文件初始化 ObjectInputStream