eof对象流和hashmap的异常

时间:2014-11-27 17:58:45

标签: java hashmap objectinputstream objectoutputstream eofexception

所以我在从对象流中存储或加载散列图时遇到问题。文件已保存,我可以看到它存储了某种信息。问题是,当我尝试读取hashmap时,它会给我一个EOF错误。提前感谢您的帮助。

public synchronized void store(StoredObject storedObject) {

    try {
        String objectName = storedObject.getObject().getClass().getName();

        File file = new File(LOCAL_STORAGE_PATH + objectName);
        boolean isNewFile = !file.exists();


        output = new ObjectOutputStream(new FileOutputStream(file));
        input = new ObjectInputStream(new FileInputStream(file));
        if (isNewFile) {
            localStorage = new HashMap<String, StoredObject>();
        } else {
            /////////////////////////
            ////does not work ///////
            /////////////////////////
            localStorage = (HashMap) input.readObject();
        }


        localStorage.put(storedObject.getKey(), storedObject);

        output.writeObject(localStorage);;
        output.flush();

    } catch (IOException ex) {
        //Logger.getLogger(LocalServer.class.getName()).log(Level.SEVERE, "ioexception", ex);
        ex.printStackTrace();
    } catch (ClassNotFoundException ex) {
        Logger.getLogger(LocalServer.class.getName()).log(Level.SEVERE, "class missmatch", ex);
    }
    finally{
         try {
            output.close();
            input.close();
        } catch (IOException ex1) {
            Logger.getLogger(LocalServer.class.getName()).log(Level.SEVERE, "could not close connection", ex1);
        }
    }

}

错误消息:

java.io.EOFException的     at java.io.ObjectInputStream $ BlockDataInputStream.peekByte(ObjectInputStream.java:2601)     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)     at ServiceLayer.LocalServer.LocalServer.store(LocalServer.java:66)     在ServiceLayer.LocalServer.LocalServerTEST.main(LocalServerTEST.java:17)

我试过的东西: 让它同步。对象(StoredObject)和子对象impliments可序列化。

1 个答案:

答案 0 :(得分:2)

您将输出和输入代码混合在一起。您正在同时创建输出和输入流。当您致电new FileOutputStream(file)时,它会替换现有文件,因此当您尝试阅读时,它会为空。

将输出和输入代码移动到两种不同的方法中。