从Java中的二进制文件读取序列化的对象？ [英] Reading serialized objects from a binary file in java?

问题描述

我有一个简单的问题。

如何读取java中二进制文件的所有内容？

我写了一些代码，检索第一个对象。

这是我的代码：

pre $ Object $ in = new ObjectInputStream（new FileInputStream（C：\\Users\\فاطمة\\Downloads \\student.bin））;
Binary b2 =（Binary）in.readObject（）;
System.out.println（Student ID：+ b2.id）;
System.out.println（Student Name：+ b2.name）;
System.out.println（Student Grade：+ b2.grade）;
in.close（）;

解决方案

如果您无法访问生成该文件的代码，则可能有两种情况：

（b>

• ）或者你知道对象的数量，那么你可以做正确数量的 ObjectInputStream.readObject（）调用，最好使用作为循环


• ，否则，问题是检测到文件。你可以使用，而循环加上 try / catch（EOFException）。

I have a simple question.

How to read all the contents of the binary file in java ?

I wrote some code but it only retrieves the first object.

Here is my code:

    ObjectInputStream in = new ObjectInputStream(new FileInputStream("C:\\Users\\فاطمة\\Downloads\\student.bin"));
    Binary b2 = (Binary)in.readObject();
    System.out.println("Student ID: " + b2.id);
    System.out.println("Student Name: " + b2.name);
    System.out.println("Student Grade: " + b2.grade);
    in.close();

解决方案

As malinator mentionned, it is bad practice to concatenate serialized objects in a single file, they should be contained in a Collection.

If you do not have access to the code producing the file, there can be 2 situations :

• either you know the number of objects, then you can do the right number of ObjectInputStream.readObject() calls, preferably with a for loop
• or you don't, then the problem is detecting the end of the file. You could use a while loop coupled with a try/catch(EOFException).

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