在Java中转换对象为byte[]。本文展示了如何在Java中把一个对象转换为byte[] 或字节数组，反之亦然。 1.

本文展示了如何在Java中把一个对象转换为byte[] 或字节数组，反之亦然。

1.将一个对象转换为byte[]

下面的例子显示了如何使用ByteArrayOutputStream 和ObjectOutputStream 将一个对象转换为byte[] 。


  // Convert object to byte[]
  public static byte[] convertObjectToBytes(Object obj) {
      ByteArrayOutputStream boas = new ByteArrayOutputStream();
      try (ObjectOutputStream ois = new ObjectOutputStream(boas)) {
          ois.writeObject(obj);
          return boas.toByteArray();
      } catch (IOException ioe) {
          ioe.printStackTrace();
      }
      throw new RuntimeException();
  }

  // Convert object to byte[]
  public static byte[] convertObjectToBytes2(Object obj) throws IOException {
      ByteArrayOutputStream boas = new ByteArrayOutputStream();
      try (ObjectOutputStream ois = new ObjectOutputStream(boas)) {
          ois.writeObject(obj);
          return boas.toByteArray();
      }
  }

2.将byte[]转换为对象

下面的例子展示了如何使用ByteArrayInputStream 和ObjectInputStream 将byte[] 转换回一个对象。


  // Convert byte[] to object
  public static Object convertBytesToObject(byte[] bytes) {
      InputStream is = new ByteArrayInputStream(bytes);
      try (ObjectInputStream ois = new ObjectInputStream(is)) {
          return ois.readObject();
      } catch (IOException | ClassNotFoundException ioe) {
          ioe.printStackTrace();
      }
      throw new RuntimeException();
  }

  // Convert byte[] to object
  public static Object convertBytesToObject2(byte[] bytes)
      throws IOException, ClassNotFoundException {
      InputStream is = new ByteArrayInputStream(bytes);
      try (ObjectInputStream ois = new ObjectInputStream(is)) {
          return ois.readObject();
      }
  }

  // Convert byte[] to object with filter
  public static Object convertBytesToObjectWithFilter(byte[] bytes, ObjectInputFilter filter) {
      InputStream is = new ByteArrayInputStream(bytes);
      try (ObjectInputStream ois = new ObjectInputStream(is)) {

          // add filter before readObject
          ois.setObjectInputFilter(filter);

          return ois.readObject();
      } catch (IOException | ClassNotFoundException ioe) {
          ioe.printStackTrace();
      }
      throw new RuntimeException();
  }

进一步阅读

Java序列化和反序列化的例子

下载源代码

$ git clonegithub.com/mkyong/core…

$ cd java-io/com/mkyong/io/object

引用

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