Java Serializable Object to Byte Array

Question

Let s say I have a serializable class AppMessage   I would like to transmit it as byte   over sockets to another machine where it is rebuilt from the bytes received   How could I achieve this

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Another interesting method is from com fasterxml jackson databind ObjectMapper  byte   data   new ObjectMapper   writeValueAsBytes JAVA OBJECT HERE   Maven Dependency   lt dependency gt       lt groupId gt com fasterxml jackson core lt  groupId gt       lt artifactId gt jackson-databind lt  artifactId gt   lt  dependency gt

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If you use Java  gt   7  you could improve the accepted solution using try with resources  private byte   convertToBytes Object object  throws IOException       try  ByteArrayOutputStream bos   new ByteArrayOutputStream             ObjectOutputStream out   new ObjectOutputStream bos             out writeObject object           return bos toByteArray              And the other way around  private Object convertFromBytes byte   bytes  throws IOException  ClassNotFoundException       try  ByteArrayInputStream bis   new ByteArrayInputStream bytes            ObjectInputStream in   new ObjectInputStream bis             return in readObject

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This is just an optimized code form of the accepted answer in case anyone wants to use this in production        public static void byteArrayOps   throws IOException  ClassNotFoundException       String str  123        byte   yourBytes   null          Convert to byte        try ByteArrayOutputStream bos   new ByteArrayOutputStream                ObjectOutputStream out    new ObjectOutputStream bos              out writeObject str         out flush          yourBytes   bos toByteArray           finally                  convert back to Object      try ByteArrayInputStream bis   new ByteArrayInputStream yourBytes               ObjectInput in   new ObjectInputStream bis             Object o   in readObject            finally

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code example with java 8    public class Person implements Serializable    private String lastName  private String firstName   public Person        public Person String firstName  String lastName        this firstName   firstName      this lastName   lastName     public void setFirstName String firstName        this firstName   firstName     public String getFirstName         return firstName     public String getLastName         return lastName     public void setLastName String lastName        this lastName   lastName      Override public String toString         return  firstName      firstName      lastName      lastName        public interface PersonMarshaller   default Person fromStream InputStream inputStream        try  ObjectInputStream objectInputStream   new ObjectInputStream inputStream             Person person   Person  objectInputStream readObject            return person        catch  IOException   ClassNotFoundException e            System err println e getMessage             return null           default OutputStream toStream Person person        try  OutputStream outputStream   new ByteArrayOutputStream              ObjectOutput objectOutput   new ObjectOutputStream outputStream           objectOutput writeObject person           objectOutput flush            return outputStream        catch  IOException e            System err println e getMessage             return null

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In case you want a nice no dependencies copy-paste solution  Grab the code below   Example  MyObject myObject        byte   bytes   SerializeUtils serialize myObject   myObject   SerializeUtils deserialize bytes     Source  import java io     public class SerializeUtils        public static byte   serialize Serializable value  throws IOException           ByteArrayOutputStream out   new ByteArrayOutputStream             try ObjectOutputStream outputStream   new ObjectOutputStream out                 outputStream writeObject value                      return out toByteArray               public static  lt T extends Serializable gt  T deserialize byte   data  throws IOException  ClassNotFoundException           try ByteArrayInputStream bis   new ByteArrayInputStream data                   noinspection unchecked             return  T  new ObjectInputStream bis  readObject

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The best way to do it is to use SerializationUtils from Apache Commons Lang   To serialize   byte   data   SerializationUtils serialize yourObject     To deserialize        YourObject yourObject   SerializationUtils deserialize data      As mentioned  this requires Commons Lang library  It can be imported using Gradle   compile  org apache commons commons-lang3 3 5    Maven    lt  -- https   mvnrepository com artifact org apache commons commons-lang3 -- gt   lt dependency gt       lt groupId gt org apache commons lt  groupId gt       lt artifactId gt commons-lang3 lt  artifactId gt       lt version gt 3 5 lt  version gt   lt  dependency gt    Jar file  And more ways mentioned here  Alternatively  the whole collection can be imported  Refer this link

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Spring Framework org springframework util SerializationUtils  byte   data   SerializationUtils serialize obj

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Can be done by SerializationUtils  by serialize  amp  deserialize method by ApacheUtils to convert object to byte   and vice-versa   as stated in  uris answer   To convert an object to byte   by serializing   byte   data   SerializationUtils serialize object     To convert byte   to object by deserializing    Object object    Object  SerializationUtils deserialize byte   data    Click on the link to Download org-apache-commons-lang jar  Integrate  jar file by clicking    FileName -  Open Medule Settings -  Select your module -  Dependencies -  Add Jar file and you are done   Hope this helps

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I also recommend to use SerializationUtils tool  I want to make a ajust on a wrong  comment by   Abilash  The SerializationUtils serialize   method is not restricted to 1024 bytes  contrary to another answer here     public static byte   serialize Object object        if  object    null            return null            ByteArrayOutputStream baos   new ByteArrayOutputStream 1024       try           ObjectOutputStream oos   new ObjectOutputStream baos           oos writeObject object           oos flush              catch  IOException ex            throw new IllegalArgumentException  Failed to serialize object of type      object getClass    ex             return baos toByteArray        At first sight  you may think that new ByteArrayOutputStream 1024  will only allow a fixed size  But if you take a close look at the ByteArrayOutputStream  you will figure out the the stream will grow if necessary      This class implements an output stream in which the data is   written into a byte array  The buffer automatically grows as data   is written to it    The data can be retrieved using toByteArray   and   toString

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If you are using spring  there s a util class available in spring-core  You can simply do  import org springframework util SerializationUtils   byte   bytes   SerializationUtils serialize anyObject   Object object   SerializationUtils deserialize bytes

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I would like to transmit it as byte   over sockets to another machine       When you connect ObjectOutputStream oos   new ObjectOutputStream socket getOutputStream        When you want to send it oos writeObject appMessage        where it is rebuilt from the bytes received       When you connect ObjectInputStream ois   new ObjectInputStream socket getInputStream        When you want to receive it AppMessage appMessage    AppMessage ois readObject

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Prepare the byte array to send   ByteArrayOutputStream bos   new ByteArrayOutputStream    ObjectOutputStream out   null  try     out   new ObjectOutputStream bos        out writeObject yourObject     out flush      byte   yourBytes   bos toByteArray            finally     try       bos close        catch  IOException ex           ignore close exception         Create an object from a byte array   ByteArrayInputStream bis   new ByteArrayInputStream yourBytes   ObjectInput in   null  try     in   new ObjectInputStream bis     Object o   in readObject             finally     try       if  in    null          in close              catch  IOException ex           ignore close exception

[java] Java Serializable Object to Byte Array

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