Examples of com.google.gson.stream.JsonWriter

com.google.gson.stream.JsonWriter

etf.org/rfc/rfc4627.txt">RFC 4627) encoded value to a stream, one token at a time. The stream includes both literal values (strings, numbers, booleans and nulls) as well as the begin and end delimiters of objects and arrays.

Encoding JSON

To encode your data as JSON, create a new {@code JsonWriter}. Each JSON document must contain one top-level array or object. Call methods on the writer as you walk the structure's contents, nesting arrays and objects as necessary:

To write arrays, first call {@link #beginArray()}. Write each of the array's elements with the appropriate {@link #value}methods or by nesting other arrays and objects. Finally close the array using {@link #endArray()}.
To write objects, first call {@link #beginObject()}. Write each of the object's properties by alternating calls to {@link #name} with the property's value. Write property values with theappropriate {@link #value} method or by nesting other objects or arrays.Finally close the object using {@link #endObject()}.

Example

Suppose we'd like to encode a stream of messages such as the following:

  {@code [}{ "id": 912345678901, "text": "How do I stream JSON in Java?", "geo": null, "user": { "name": "json_newb", "followers_count": 41 } }, { "id": 912345678902, "text": "@json_newb just use JsonWriter!", "geo": [50.454722, -104.606667], "user": { "name": "jesse", "followers_count": 2 } } ]}

This code encodes the above structure:

    {@code}public void writeJsonStream(OutputStream out, List messages) throws IOException  JsonWriter writer = new JsonWriter(new OutputStreamWriter(out, "UTF-8")); writer.setIndentSpaces(4); writeMessagesArray(writer, messages); writer.close(); } public void writeMessagesArray(JsonWriter writer, List messages) throws IOException { writer.beginArray(); for (Message message : messages) { writeMessage(writer, message); } writer.endArray(); } public void writeMessage(JsonWriter writer, Message message) throws IOException { writer.beginObject(); writer.name("id").value(message.getId()); writer.name("text").value(message.getText()); if (message.getGeo() != null) { writer.name("geo"); writeDoublesArray(writer, message.getGeo()); } else { writer.name("geo").nullValue(); } writer.name("user"); writeUser(writer, message.getUser()); writer.endObject(); } public void writeUser(JsonWriter writer, User user) throws IOException { writer.beginObject(); writer.name("name").value(user.getName()); writer.name("followers_count").value(user.getFollowersCount()); writer.endObject(); } public void writeDoublesArray(JsonWriter writer, List doubles) throws IOException { writer.beginArray(); for (Double value : doubles) { writer.value(value); } writer.endArray(); }}

Each {@code JsonWriter} may be used to write a single JSON stream.Instances of this class are not thread safe. Calls that would result in a malformed JSON string will fail with an {@link IllegalStateException}. @author Jesse Wilson @since 1.6


  @Override
  public void sendJson(HttpResponseStatus status, Object object, Type type, Gson gson) {
    try {
      ChannelBuffer channelBuffer = ChannelBuffers.dynamicBuffer();
      JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(new ChannelBufferOutputStream(channelBuffer),
                                                                    Charsets.UTF_8));
      try {
        gson.toJson(object, type, jsonWriter);
      } finally {
        jsonWriter.close();
      }


      sendContent(status, channelBuffer, "application/json", ImmutableMultimap.<String, String>of());
    } catch (IOException e) {
      throw Throwables.propagate(e);

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   */
  @Override
  public void sendJson(HttpResponseStatus status, Object object, Type type, Gson gson) {
    try {
      ChannelBuffer channelBuffer = ChannelBuffers.dynamicBuffer();
      JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(new ChannelBufferOutputStream(channelBuffer),
                                                                    Charsets.UTF_8));
      try {
        gson.toJson(object, type, jsonWriter);
      } finally {
        jsonWriter.close();
      }


      sendContent(status, channelBuffer, "application/json", ImmutableMultimap.<String, String>of());
    } catch (IOException e) {
      throw Throwables.propagate(e);

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                      applicationId,
                      procedureName,
                      method));
    HttpURLConnection urlConn = (HttpURLConnection) url.openConnection();
    urlConn.setDoOutput(true);
    JsonWriter writer = new JsonWriter(new OutputStreamWriter(urlConn.getOutputStream(), Charsets.UTF_8));
    try {
      new Gson().toJson(arguments, new TypeToken<Map<String, String>>() { }.getType(), writer);
    } finally {
      writer.close();
    }
    if (urlConn.getResponseCode() != 200) {
      throw new IOException("Response code != 200 (responded = " +
                              urlConn.getResponseCode() + " " + urlConn.getResponseMessage() + ")");
    }

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        return new byte[0];
    }


    public void writeTo(MessageContext outMsgCtxt, OMOutputFormat omOutputFormat, OutputStream outputStream, boolean b) throws AxisFault {
        String charSetEncoding = (String) outMsgCtxt.getProperty(Constants.Configuration.CHARACTER_SET_ENCODING);
        JsonWriter jsonWriter;
        String msg;


        try {
            jsonWriter = new JsonWriter(new OutputStreamWriter(outputStream, charSetEncoding));
            Object retObj = outMsgCtxt.getProperty(JsonConstant.RETURN_OBJECT);


            if (outMsgCtxt.isProcessingFault()) {
                OMElement element = outMsgCtxt.getEnvelope().getBody().getFirstElement();
                try {
                    jsonWriter.beginObject();
                    jsonWriter.name(element.getLocalName());
                    jsonWriter.beginObject();
                    Iterator childrenIterator = element.getChildElements();
                    while (childrenIterator.hasNext()) {
                        Object next = childrenIterator.next();
                        OMElement omElement = (OMElement) next;
                        jsonWriter.name(omElement.getLocalName());
                        jsonWriter.value(omElement.getText());
                    }
                    jsonWriter.endObject();
                    jsonWriter.endObject();
                    jsonWriter.flush();
                    jsonWriter.close();
                } catch (IOException e) {
                    throw new AxisFault("Error while processing fault code in JsonWriter");
                }


            } else if (retObj == null) {
                OMElement element = outMsgCtxt.getEnvelope().getBody().getFirstElement();
                QName elementQname = outMsgCtxt.getAxisOperation().getMessage
                        (WSDLConstants.MESSAGE_LABEL_OUT_VALUE).getElementQName();


                ArrayList<XmlSchema> schemas = outMsgCtxt.getAxisService().getSchema();
                GsonXMLStreamWriter xmlsw = new GsonXMLStreamWriter(jsonWriter,
                                                                    elementQname,
                                                                    schemas,
                                                                    outMsgCtxt.getConfigurationContext());
                try {
                    xmlsw.writeStartDocument();
                    if (b) {
                        element.serialize(xmlsw);
                    } else {
                        element.serializeAndConsume(xmlsw);
                    }
                    xmlsw.writeEndDocument();
                } catch (XMLStreamException e) {
                    throw new AxisFault("Error while writing to the output stream using JsonWriter", e);
                }


            } else {
                try {
                    Gson gson = new Gson();
                    jsonWriter.beginObject();
                    jsonWriter.name(JsonConstant.RESPONSE);
                    Type returnType = (Type) outMsgCtxt.getProperty(JsonConstant.RETURN_TYPE);
                    gson.toJson(retObj, returnType, jsonWriter);
                    jsonWriter.endObject();
                    jsonWriter.flush();


                } catch (IOException e) {
                    msg = "Exception occur while writting to JsonWriter at the JsonFormatter ";
                    log.error(msg, e);
                    throw AxisFault.makeFault(e);

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  private SecurityContext securityContext = null;
  private JsonWriter writer               = null;


  public StructrJsonWriter(final SecurityContext securityContext, final Writer writer) {
    this.securityContext = securityContext;
    this.writer = new JsonWriter(writer);
    this.writer.setLenient(Boolean.parseBoolean(StructrApp.getConfigurationValue("json.lenient", "false")));
  }

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    @Test
    public void testGsonXMLStreamWriter() throws Exception {
        jsonString = "{\"response\":{\"return\":{\"name\":\"kate\",\"age\":\"35\",\"gender\":\"female\"}}}";
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(baos, "UTF-8");
        JsonWriter jsonWriter = new JsonWriter(outputStreamWriter);
        String fileName = "test-resources/custom_schema/testSchema_1.xsd";
        InputStream is = new FileInputStream(fileName);
        XmlSchemaCollection schemaCol = new XmlSchemaCollection();
        XmlSchema schema = schemaCol.read(new StreamSource(is));
        List<XmlSchema> schemaList = new ArrayList<XmlSchema>();

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      }


      if (saveFile) {
        log.warn("File " + genFile + " is from an old version and will be converted to the new format.");


        JsonWriter w = null;
        try {
          w = new JsonWriter(new FileWriter(genFile));
          w.setIndent("    ");
          writer.toJson(genList, w);
        } catch (IOException e) {
          log.error("There was an error updating " + genFile.getName() + "!", e);
        } finally {
          if (w != null) {
            try {
              w.close();
            } catch (IOException e) {
              log.error("There was an error updating " + genFile.getName() + "!", e);
            }
          }
        }

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            .setPrettyPrinting()
            .serializeNulls()
            .excludeFieldsWithModifiers(Modifier.STATIC,
                Modifier.TRANSIENT).create();
        FileOutputStream outputStream = new FileOutputStream(dataFile);
        JsonWriter writer = new JsonWriter(new OutputStreamWriter(
            outputStream, "UTF-8"));
        writer.setSerializeNulls(true);
        writer.setIndent("    ");
        writer.beginArray();
        for (Map.Entry<UUID, WorkerInfo> i : workerStack.entrySet()) {
          adapter.setCurrentUUID(i.getKey());
          serializer.toJson(i.getValue(), WorkerInfo.class, writer);
        }
        writer.endArray();
        writer.close();
        outputStream.close();
        getLogger().log(Level.INFO, "Villagers information serialized.");
      } catch (Exception ex) {
        getLogger().log(Level.SEVERE, "Can't serialize villagers informations.", ex);
        ex.printStackTrace();

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      // Send with chunk response, as we don't want to buffer all events in memory to determine the content-length.
      responder.sendChunkStart(HttpResponseStatus.OK,
                               ImmutableMultimap.of(HttpHeaders.Names.CONTENT_TYPE, "application/json; charset=utf-8"));
      ChannelBuffer buffer = ChannelBuffers.dynamicBuffer();
      JsonWriter jsonWriter = new JsonWriter(new OutputStreamWriter(new ChannelBufferOutputStream(buffer),
                                                                    Charsets.UTF_8));
      // Response is an array of stream event
      jsonWriter.beginArray();
      while (limit > 0 && eventsRead > 0) {
        limit -= eventsRead;


        for (StreamEvent event : events) {
          GSON.toJson(event, StreamEvent.class, jsonWriter);
          jsonWriter.flush();


          // If exceeded chunk size limit, send a new chunk.
          if (buffer.readableBytes() >= CHUNK_SIZE) {
            // No way to know if it is ok to send chunk or not. See ENG-4168
            responder.sendChunk(buffer);
            buffer.clear();
          }
        }
        events.clear();


        if (limit > 0) {
          eventsRead = reader.read(events, getReadLimit(limit), 0, TimeUnit.SECONDS, readFilter);
        }
      }
      jsonWriter.endArray();
      jsonWriter.close();


      // Send the last chunk that still has data
      if (buffer.readable()) {
        responder.sendChunk(buffer);
      }

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      do {
        event = events.peekFirst();


        try {
          JsonWriter jsonWriter = new JsonWriter(writer);
          jsonWriter.setIndent("  ");
          jsonWriter.beginArray();
          jsonWriter.value(event.getType().name());
          gson.toJson(event, event.getClass(), jsonWriter);
          jsonWriter.endArray();
        } catch (Throwable t) {
          Closeables.closeQuietly(writer);
          writer = null;


          SlaveMain.warn("Unhandled exception in event serialization.", t);

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