Java读取对象输入流到arraylist？ [英] Java read object input stream into arraylist?

问题描述

下面的方法应该将二进制文件读入 arrayList 。但是在java.io.ObjectInputStream中获得 java.io.EOFException ：

The method below is supposed to read a binary file into an arrayList. But getting a java.io.EOFException:

at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2553)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1296)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at .... Read(Tester.java:400) 
at .... main(Tester.java:23)

main的第23行调用方法，第400行是下面的while循环。任何想法？

Line 23 at main just calls the method, line 400 is the while loop below. Any ideas?

private static void Read() {
    try {
        ObjectInputStream objIn = new ObjectInputStream(new FileInputStream("/file.bin"));
        while (objIn.readObject() != null) {
            list.add((Libreria) objIn.readObject());
        }
        objIn.close();
    } catch(Exception e) {
        e.printStackTrace();
    }
}

推荐答案

As根据其他答案，你在循环中阅读两次。你的另一个问题是空测试。 readObject（）只有在写入空值时才返回null，而不是在EOS，因此将它用作循环终止测试没有多大意义。正确终止 readObject（）循环是

As per the other answers you are reading twice in the loop. Your other problem is the null test. readObject() only returns null if you have written a null, not at EOS, so there's not much point in using it as a loop termination test. The correct termination of a readObject() loop is

catch (EOFException exc)
{
 in.close();
 break;
}

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