com.fasterxml.jackson.core.JsonGenerator#disable ( )源码实例Demo

/**
 * Helper method that encapsulate logic in trying to close output generator
 * in case of failure; useful mostly in forcing flush()ing as otherwise
 * error conditions tend to be hard to diagnose. However, it is often the
 * case that output state may be corrupt so we need to be prepared for
 * secondary exception without masking original one.
 *
 * @since 2.8
 */
public static void closeOnFailAndThrowAsIOE(JsonGenerator g, Exception fail)
    throws IOException
{
    /* 04-Mar-2014, tatu: Let's try to prevent auto-closing of
     *    structures, which typically causes more damage.
     */
    g.disable(JsonGenerator.Feature.AUTO_CLOSE_JSON_CONTENT);
    try {
        g.close();
    } catch (Exception e) {
        fail.addSuppressed(e);
    }
    throwIfIOE(fail);
    throwIfRTE(fail);
    throw new RuntimeException(fail);
}
 

private void writeValue(ObjectWriter writer, PropertyFilter filter, Object value, OutputStream outputStream) throws IOException {
  JsonGenerator generator = writer.getFactory().createGenerator(outputStream);
  // Important: we are NOT to close the underlying stream after
  // mapping, so we need to instruct generator
  generator.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
  generator = new PropertyFilteringJsonGenerator(generator, filter);

  boolean ok = false;

  try {
    writer.writeValue(generator, value);
    ok = true;
  } finally {
    if (ok) {
      generator.close();
    } else {
      try {
        generator.close();
      } catch (Exception ignored) {}
    }
  }
}
 

protected JsonGenerator createGenerator(OutputStream output) throws IOException {
	JsonGenerator generator = jsonFactory.createJsonGenerator(output, JsonEncoding.UTF8);
	generator.disable(JsonGenerator.Feature.AUTO_CLOSE_TARGET);
	return generator;
}