Examples of java.io.ObjectInputStream

java.io.ObjectInputStream
An ObjectInputStream can be used to load Java objects from a stream where the objects were saved using an ObjectOutputStream. Primitive data (ints, bytes, chars, etc) can also be loaded if the data was saved as primitive types as well. It is invalid to attempt to read an object as primitive data. @see ObjectOutputStream @see ObjectInput @see Serializable @see Externalizable

          case VIRTUAL: 
            final int nfrag = rawContentDataInputStream.readInt();
            for ( int i = 0; i < 2 * nfrag; i++ ) MutableString.skipSelfDelimUTF8( rawContent );
            break;
          default: // Non-text and non-virtual
            new ObjectInputStream( rawContent ).readObject();
          }
          nextFieldToRead++;
        }
        
        /** Skips to the given field.
         * 
         * @param field the field to skip to.
         * @throws IOException
         * @throws ClassNotFoundException
         */
        private void skipToField( final int field ) throws IOException, ClassNotFoundException {
          if ( nextFieldToRead > field ) throw new IllegalStateException( "Trying to skip to field " + field + " after " + nextFieldToRead );
          while ( nextFieldToRead < field ) skipOneField();
        }


        public Object content( final int field ) {
          ensureFieldIndex( field );
          Object result = null;
          if ( DEBUG ) LOGGER.debug( "Called content(" + field + "); nextField:" + nextFieldToRead );
          try {
            skipToField( field );
            if ( fieldType( nextFieldToRead ) == FieldType.VIRTUAL ) {
              final int nfrag = rawContentDataInputStream.readInt();
              MutableString doc = new MutableString();
              MutableString text = new MutableString();
              VirtualDocumentFragment[] fragArray = new VirtualDocumentFragment[ nfrag ];
              for ( int i = 0; i < nfrag; i++ ) {
                doc.readSelfDelimUTF8( rawContent );
                text.readSelfDelimUTF8( rawContent );
                fragArray[ i ] = new AnchorExtractor.Anchor( doc.copy(), text.copy() );
              }
              result = new ObjectArrayList<VirtualDocumentFragment>( fragArray );
            }
            else if ( fieldType( nextFieldToRead ) != FieldType.TEXT ) {
              result = new ObjectInputStream( rawContent ).readObject();
              if ( DEBUG ) LOGGER.debug( "Read " + result + " from field " + fieldName( nextFieldToRead ) + " of object " + title() );
              nextFieldToRead++;
            }
            else {
              if ( DEBUG ) LOGGER.debug( "Returning reader for " + field );

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          case VIRTUAL:
            final int nfrag = nonTextDataInputStream.readInt();
            for ( int i = 0; i < 2 * nfrag; i++ ) MutableString.skipSelfDelimUTF8( nonTextDataInputStream );
            break;
          default:
            try { new ObjectInputStream( nonTextDataInputStream ).readObject(); } catch ( ClassNotFoundException e ) { throw new RuntimeException( e ); }
          }
          nextField++;
        }
        
        // Read field
        nextField++;


        switch( fieldType ) {
        case TEXT:
          len = documentsInputBitStream.readDelta();
          fieldContent.length( 0 );


          termsFrequencyKeeper.reset();
          if ( exact ) nonTermsFrequencyKeeper.reset();


          while( len-- != 0 ) {
            termsInputStream.position( termOffsets.getLong( termsFrequencyKeeper.decode( documentsInputBitStream.readDelta() ) ) );
            s.readSelfDelimUTF8( termsInputStream );
            fieldContent.append( s );
            if ( exact ) {
              nonTermsInputStream.position( nonTermOffsets.getLong( nonTermsFrequencyKeeper.decode( documentsInputBitStream.readDelta() ) ) );
              s.readSelfDelimUTF8( nonTermsInputStream );
              fieldContent.append( s );
            }
            else fieldContent.append( ' ');
          }
          return new FastBufferedReader( fieldContent );
        case VIRTUAL:
          final int nfrag = nonTextDataInputStream.readInt();
          MutableString doc = new MutableString();
          MutableString text = new MutableString();
          VirtualDocumentFragment[] fragArray = new VirtualDocumentFragment[ nfrag ];
          for ( int i = 0; i < nfrag; i++ ) {
            doc.readSelfDelimUTF8( (InputStream)nonTextDataInputStream );
            text.readSelfDelimUTF8( (InputStream)nonTextDataInputStream );
            fragArray[ i ] = new AnchorExtractor.Anchor( doc.copy(), text.copy() );
          }
          return new ObjectArrayList<VirtualDocumentFragment>( fragArray );


        default:
          try { return new ObjectInputStream( nonTextDataInputStream ).readObject(); } catch ( ClassNotFoundException e ) { throw new RuntimeException( e ); }
        }
      
        
      }

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    // need to do this check because we are a stream type
    if (bytes == null) {
      return null;
    }
    try {
      ObjectInputStream objInStream = new ObjectInputStream(new ByteArrayInputStream(bytes));
      return objInStream.readObject();
    } catch (Exception e) {
      throw SqlExceptionUtil.create("Could not read serialized object from byte array: " + Arrays.toString(bytes)
          + "(len " + bytes.length + ")", e);
    }
  }

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        if (!isRpc) {
          List params = constructParams(method, modelMap);
          args = params.size() > 0 ? params.toArray() : null;
        } else {
          byte[] bytes = (byte[]) modelMap.get(ModelMap.RPC_ARGS_KEY);
          ObjectInputStream obj_in = new ObjectInputStream(
              new ByteArrayInputStream(bytes));
          args = (Object[]) obj_in.readObject();
        }


        // 执行业务方法
        result = method.invoke(instance, args);

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                }
            }
        }
    }
    public static DiskCacheObject deSerialize(byte[] data) throws DiskCacheException {
        ObjectInputStream ois = null;
        try {
            ByteArrayInputStream bais = new ByteArrayInputStream(data);
            BufferedInputStream bis = new BufferedInputStream(bais);
            ois=new ObjectInputStream(bis);
            DiskCacheObject obj = (DiskCacheObject) ois.readObject();
            obj.getCacheObject().resetRefCount();
            return obj;
        } catch (IOException e) {
            throw new IllegalStateException("An exception occured when reading from the disk cache." +
                " Reason: " + e.getMessage());
        } catch (ClassNotFoundException e) {
            throw new IllegalStateException("A class could not be found when deSerializing." +
                " Reason: " + e.getMessage());
        } finally {
          if (ois != null) {
              try {
                  ois.close();
              } catch (IOException e) {
                  throw new IllegalStateException(
                      "Failed to close stream to DiskCache, "
                      + "cache may be corrupted. Reason: " + e.getMessage());
              }

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   *          input stream to read from
   * @throws IOException
   *           any usual I/O errors
   */
  public PacketInputStream(InputStream in) throws IOException {
    this.in = new ObjectInputStream(in);


  }

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    final ByteArrayOutputStream bo = new ByteArrayOutputStream();
    final ObjectOutputStream out = new ObjectOutputStream(bo);
    out.writeObject(cpd);
    out.close();


    final ObjectInputStream oin = new ObjectInputStream
      (new ByteArrayInputStream(bo.toByteArray()));
    final Object e2 = oin.readObject();
    assertNotNull(e2); // cannot assert equals, as this is not implemented.
    assertEquals(cpd, e2);
  }

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    final ByteArrayOutputStream bo = new ByteArrayOutputStream();
    final ObjectOutputStream out = new ObjectOutputStream(bo);
    out.writeObject(cpd);
    out.close();


    final ObjectInputStream oin = new ObjectInputStream
      (new ByteArrayInputStream(bo.toByteArray()));
    final Object e2 = oin.readObject();
    assertNotNull(e2); // cannot assert equals, as this is not implemented.
    assertEquals(cpd, e2);
  }

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    final Element e = new Element();
    final ByteArrayOutputStream bo = new ByteArrayOutputStream();
    final ObjectOutputStream out = new ObjectOutputStream(bo);
    out.writeObject(e);


    final ObjectInputStream oin = new ObjectInputStream(new ByteArrayInputStream(bo.toByteArray()));
    final Element e2 = (Element) oin.readObject();
    assertNotNull(e2); // cannot assert equals, as this is not implemented ...
  }

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    final MasterReport report = new MasterReport();
    final ByteArrayOutputStream bo = new ByteArrayOutputStream();
    final ObjectOutputStream out = new ObjectOutputStream(bo);
    out.writeObject(report);


    final ObjectInputStream oin = new ObjectInputStream(new ByteArrayInputStream(bo.toByteArray()));
    final MasterReport e2 = (MasterReport) oin.readObject();
    assertNotNull(e2); // cannot assert equals, as this is not implemented.
  }

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