Java序列化的时候修改对象的包路径

 由于在做迁移项目的时候修改了一些类的目录，导致远程系统在接收序列化字节码的时候报ClassNotFound异常，所以想到的方案是在新项目中修改序列化数据中的路径名称，以下是google到的一个方法：

public static byte[] changePathInSerializedData( byte[] buffer, String fromPath, String toPath ) throws IOException
  {
    byte[] search = fromPath.getBytes( "UTF-8" );
    byte[] replace = toPath.getBytes( "UTF-8" );

    ByteArrayOutputStream f = new ByteArrayOutputStream();

    for ( int i = 0; i < buffer.length; i++ )
    {
      // Search 2 bytes ahead to let us modify the 2 bytes length of the class
      // name (see Serialize format http://www.javaworld.com/community/node/2915
      // )
      boolean found = false;
      int searchMaxIndex = i + search.length + 2;
      if ( searchMaxIndex <= buffer.length )
      {
        found = true;
        for ( int j = i + 2; j < searchMaxIndex; j++ )
        {
          if ( search[ j - i - 2 ] != buffer[ j ] )
          {
            found = false;
            break;
          }
        }
      }
      if ( found )
      {
        int high = ( (int) ( buffer[ i ] ) & 0xff );
        int low = ( (int) ( buffer[ i + 1 ] ) & 0xff );
        int classNameLength = ( high << 8 ) + low;
        classNameLength += replace.length - search.length;
        // Write new length
        f.write( ( classNameLength >> 8 ) & 0xff );
        f.write( ( classNameLength ) & 0xff );
        // Write replacement path
        f.write( replace );
        i = searchMaxIndex - 1;
      }
      else
      {
        f.write( buffer[ i ] );
      }
    }

    f.flush();
    f.close();

    return f.toByteArray();
  }

用法就是将序列化后的byte[]数据调用这个方法：

//data 为对象
ByteArrayOutputStream out = new ByteArrayOutputStream();
    ObjectOutputStream objOut = new ObjectOutputStream( out );
    objOut.writeObject( data );
    objOut.close();
    out.close();    
return changePathInSerializedData(out.toByteArray(), NEW_PATH, OLD_PATH);

希望可以帮助到需要的人。