Java 将 ObjectInputStream 结果转换为 ArrayList

Question

有没有办法将 OutputStream 立即转换为 ArrayList？

我正在这里测试一些东西以及我所得到的例如:

写作:

// Some list
List<Edge> edges = = new ArrayList<>(); 
edges.add(new Edge...)
edges.add(new Edge...)
...

OutputStream outStream = socket.getOutputStream();
ObjectOutputStream out = new ObjectOutputStream(outStream);
out.writeObject(edges);

阅读

InputStream inStream = socket.getInputStream();
ObjectInputStream in = new ObjectInputStream(inStream);
Object inObject = in.readObject();
if (inObject.getClass() == ArrayList.class) {
   System.err.println("IS LIST");
   List<Edge> edges = (List<Edge>) in.readObject();
}

结果

IS LIST
Jun 01, 2016 6:15:05 PM client.Client main
SEVERE: null
java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2608)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at client.Client.main(Client.java:86)

Answer 1

EOFException 是“文件结束”异常。这意味着当没有更多数据可供读取时(已经在文件末尾)，您尝试读取数据。

出现这种情况是因为您正在读取 2 个对象，但只发送 1 个对象。无需第二次调用 in.readObject()，只需转换您已读取的对象即可:

list = (List<Edge>) inObject;