Examples of com.fasterxml.jackson.core.JsonGenerator

com.fasterxml.jackson.core.JsonGenerator
Base class that defines public API for writing JSON content. Instances are created using factory methods of a {@link JsonFactory} instance. @author Tatu Saloranta


        File outputFile = new File(outputDirectory, finalName + "-changes.json");


        JsonFactory factory = new JsonFactory();
        try {
            JsonGenerator generator = factory.createJsonGenerator(outputFile, JsonEncoding.UTF8);
            generator.setPrettyPrinter(new DefaultPrettyPrinter());
            try {
                generator.writeStartObject();
                generator.writeFieldName("dependencies");
                writeDependenciesDelta(addedDeps, removedDeps, updatedDeps, generator);
                if (changeLog != null) {
                    generator.writeFieldName("scm");
                    writeChangeLog(generator, changeLog);
                }
                generator.writeEndObject();
            } finally {
                generator.close();
            }
        } catch (IOException e) {
            throw new MojoExecutionException(e.getMessage(), e);
        }
        projectHelper.attachArtifact(project, "json", "changes", outputFile);

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  }


  @Override
  public void serialize( @Nonnull T object, @WillNotClose @Nonnull OutputStream out ) throws IOException {
    JsonFactory jsonFactory = JacksonSupport.getJsonFactory();
    JsonGenerator generator = jsonFactory.createGenerator( out, JsonEncoding.UTF8 );


    serialize( object, generator );
    generator.flush();
  }

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    public static final JsonFactory JSON_FACTORY = new JsonFactory();


    public static String domToJson(Node in) throws IOException {
        final StringWriter sw = new StringWriter(512);
        final JsonGenerator gen = JSON_FACTORY.createGenerator(sw);
        gen.useDefaultPrettyPrinter();
        gen.writeStartObject();
        domToJson(in, gen);
        gen.writeEndObject();
        gen.flush();
        sw.flush();
        return sw.toString();
    }

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      ServletOutputStream outputStream = response.getOutputStream();


      if (!streamResponse) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
        JsonGenerator jsonGenerator = objectMapper.getJsonFactory().createJsonGenerator(bos, JsonEncoding.UTF8);
        objectMapper.writeValue(jsonGenerator, responseObject);
        response.setContentLength(bos.size());
        outputStream.write(bos.toByteArray());
        jsonGenerator.close();
      } else {
        JsonGenerator jsonGenerator = objectMapper.getJsonFactory().createJsonGenerator(outputStream,
            JsonEncoding.UTF8);
        objectMapper.writeValue(jsonGenerator, responseObject);
        jsonGenerator.close();
      }


      outputStream.flush();
    }
  }

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  }


  @Override
  public void serialize( @Nonnull T object, @WillNotClose @Nonnull OutputStream out ) throws IOException {
    JsonFactory jsonFactory = JacksonSupport.getJsonFactory();
    JsonGenerator generator = jsonFactory.createGenerator( out, JsonEncoding.UTF8 );


    serialize( object, generator );
    generator.flush();
  }

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    final ObjectMapper objectMapper = jsonHandler.getMapper();
    final ServletOutputStream outputStream = response.getOutputStream();


    if (!streamResponse) {
      ByteArrayOutputStream bos = new ByteArrayOutputStream(1024);
      JsonGenerator jsonGenerator = objectMapper.getJsonFactory().createJsonGenerator(bos, JsonEncoding.UTF8);
      objectMapper.writeValue(jsonGenerator, responseObject);
      response.setContentLength(bos.size());
      outputStream.write(bos.toByteArray());
    } else {
      JsonGenerator jsonGenerator = objectMapper.getJsonFactory().createJsonGenerator(outputStream,
          JsonEncoding.UTF8);
      objectMapper.writeValue(jsonGenerator, responseObject);
    }


    outputStream.flush();

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    }


    public final void writeToStream(T value, OutputStream out, boolean indent)
        throws IOException
    {
        JsonGenerator g = JsonReader.jsonFactory.createGenerator(out);
        if (indent) {
            g = g.useDefaultPrettyPrinter();
        }
        try {
            write(value, g);
        }
        finally {
            g.flush();
        }
    }

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    {
        ObjectMapper mapper = new ObjectMapper();
        assertTrue(mapper.getSerializationConfig().isEnabled(SerializationFeature.FLUSH_AFTER_WRITE_VALUE));
        // default is to flush after writeValue()
        StringWriter sw = new StringWriter();
        JsonGenerator jgen = mapper.getFactory().createGenerator(sw);
        mapper.writeValue(jgen, Integer.valueOf(13));
        assertEquals("13", sw.toString());
        jgen.close();


        // ditto with ObjectWriter
        sw = new StringWriter();
        jgen = mapper.getFactory().createGenerator(sw);
        ObjectWriter ow = mapper.writer();
        ow.writeValue(jgen, Integer.valueOf(99));
        assertEquals("99", sw.toString());
        jgen.close();
    }

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    {
        // but should not occur if configured otherwise
        ObjectMapper mapper = new ObjectMapper();
        mapper.configure(SerializationFeature.FLUSH_AFTER_WRITE_VALUE, false);
        StringWriter sw = new StringWriter();
        JsonGenerator jgen = mapper.getFactory().createGenerator(sw);


        mapper.writeValue(jgen, Integer.valueOf(13));
        // no flushing now:
        assertEquals("", sw.toString());
        // except when actually flushing
        jgen.flush();
        assertEquals("13", sw.toString());
        jgen.close();
        // Also, same should happen with ObjectWriter
        sw = new StringWriter();
        jgen = mapper.getFactory().createGenerator(sw);
        ObjectWriter ow = mapper.writer();
        ow.writeValue(jgen, Integer.valueOf(99));
        assertEquals("", sw.toString());
        // except when actually flushing
        jgen.flush();
        assertEquals("99", sw.toString());
        jgen.close();
    }

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    public void testPojoWriting()
        throws IOException
    {
        JsonFactory jf = new MappingJsonFactory();
        StringWriter sw = new StringWriter();
        JsonGenerator gen = jf.createGenerator(sw);
        gen.writeObject(new Pojo());
        gen.close();
        // trimming needed if main-level object has leading space
        String act = sw.toString().trim();
        assertEquals("{\"x\":4}", act);
    }

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