java - 在 java 中序列化一个 HashMap 以将它从服务器传递到 java 中的客户端

Question

我正在用 Java 编写服务器/客户端应用程序。我在服务器端做一些数据处理，然后将其存储在 HashMap 中。将 HashMap 传递给客户端的最佳方式是什么？

Answer 1

最直接的解决方案是使用 ObjectOutputStream 和 ObjectInputStream 对其进行序列化/反序列化

try {
    ...
    final Map<A, B> yourMap = ...; // Map to send
    final OutputStream yourOutputStream = ...; // OutputStream where to send the map in case of network you get it from the Socket instance.
    final ObjectOutputStream mapOutputStream = new ObjectOutputStream(yourOutputStream);
    mapOutputStream.writeObject(yourMap);
    ...
} finally {
    outputStream.close();
}

并接收它:

try {
    ...
    final InputStream yourInputStream = ...; // InputStream from where to receive the map, in case of network you get it from the Socket instance.
    final ObjectInputStream mapInputStream = new ObjectInputStream(yourInputStream);
    final Map<A, B> yourMap = (Map) mapInputStream.readObject();
    ...
} finally {
    mapInputStream.close();
}

请注意，这不需要任何外部库。