Convert object to byte[] in Java
This article shows how to convert an object to byte[]
or byte array and vice versa in Java.
1. Convert an object to byte[]
The below example show how to use ByteArrayOutputStream
and ObjectOutputStream
to convert an object to 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. Convert byte[] to object
The below example show how to use ByteArrayInputStream
and ObjectInputStream
to convert byte[]
back to an object.
// 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();
}
Further Reading
Download Source Code
$ git clone https://github.com/mkyong/core-java.git
$ cd java-io/com/mkyong/io/object
References
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