com.fasterxml.jackson.databind.JsonNode.traverse()方法的使用及代码示例

x33g5p2x  于2022-01-21 转载在 其他  
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本文整理了Java中com.fasterxml.jackson.databind.JsonNode.traverse()方法的一些代码示例，展示了JsonNode.traverse()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。JsonNode.traverse()方法的具体详情如下：
包路径：com.fasterxml.jackson.databind.JsonNode
类名称：JsonNode
方法名：traverse

JsonNode.traverse介绍

[英]Method for constructing a JsonParser instance for iterating over contents of the tree that this node is root of. Functionally equivalent to first serializing tree using com.fasterxml.jackson.core.ObjectCodec and then re-parsing but more efficient.
[中]方法，该方法用于构造一个JsonParser实例，用于迭代此节点所在树的内容。在功能上等同于使用com的第一个序列化树。fasterxml。杰克逊。果心ObjectCodec，然后重新解析，但效率更高。

代码示例

代码示例来源：origin: spring-projects/spring-security

@Override
  public Set deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    ObjectMapper mapper = (ObjectMapper) jp.getCodec();
    JsonNode node = mapper.readTree(jp);
    Set<Object> resultSet = new HashSet<>();
    if (node != null) {
      if (node instanceof ArrayNode) {
        ArrayNode arrayNode = (ArrayNode) node;
        Iterator<JsonNode> nodeIterator = arrayNode.iterator();
        while (nodeIterator.hasNext()) {
          JsonNode elementNode = nodeIterator.next();
          resultSet.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
        }
      } else {
        resultSet.add(mapper.readValue(node.traverse(mapper), Object.class));
      }
    }
    return Collections.unmodifiableSet(resultSet);
  }
}

代码示例来源：origin: embulk/embulk

@Override
public <E> E get(Class<E> type, String attrName, E defaultValue) {
  JsonNode json = data.get(attrName);
  if (json == null) {
    return defaultValue;
  }
  return model.readObject(type, json.traverse());
}

代码示例来源：origin: spring-projects/spring-security

@Override
  public List deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    ObjectMapper mapper = (ObjectMapper) jp.getCodec();
    JsonNode node = mapper.readTree(jp);
    List<Object> result = new ArrayList<Object>();
    if (node != null) {
      if (node instanceof ArrayNode) {
        ArrayNode arrayNode = (ArrayNode) node;
        Iterator<JsonNode> nodeIterator = arrayNode.iterator();
        while (nodeIterator.hasNext()) {
          JsonNode elementNode = nodeIterator.next();
          result.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
        }
      } else {
        result.add(mapper.readValue(node.traverse(mapper), Object.class));
      }
    }
    return Collections.unmodifiableList(result);
  }
}

代码示例来源：origin: stackoverflow.com

public class App {

  public static class Foo {
    public int foo;
  }

  public static void main(String[] args) {

    String json = "{\"someArray\":[{\"foo\":5},{\"foo\":6},{\"foo\":7}]}";
    ObjectMapper mapper = new ObjectMapper();
    JsonNode node = mapper.readTree(json);
    node = node.get("someArray");
    TypeReference<List<Foo>> typeRef = new TypeReference<List<Foo>>(){};
    List<Foo> list = mapper.readValue(node.traverse(), typeRef);
    for (Foo f : list) {
      System.out.println(f.foo);
    }
  }
}

代码示例来源：origin: org.springframework.security/spring-security-core

@Override
  public List deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    ObjectMapper mapper = (ObjectMapper) jp.getCodec();
    JsonNode node = mapper.readTree(jp);
    List<Object> result = new ArrayList<Object>();
    if (node != null) {
      if (node instanceof ArrayNode) {
        ArrayNode arrayNode = (ArrayNode) node;
        Iterator<JsonNode> nodeIterator = arrayNode.iterator();
        while (nodeIterator.hasNext()) {
          JsonNode elementNode = nodeIterator.next();
          result.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
        }
      } else {
        result.add(mapper.readValue(node.traverse(mapper), Object.class));
      }
    }
    return Collections.unmodifiableList(result);
  }
}

代码示例来源：origin: stagemonitor/stagemonitor

@Override
public void reload() throws IOException {
  final JsonNode json = elasticsearchClient.getJson(path, true);
  if (json != null) {
    final JsonNode source = json.get("_source").get("configuration");
    List<EsConfigurationDto> configAsList = JsonUtils.getMapper().readValue(source.traverse(), new TypeReference<List<EsConfigurationDto>>() {
    });
    configuration = EsConfigurationDto.toMap(configAsList);
  }
}

代码示例来源：origin: org.springframework.security/spring-security-core

@Override
  public Set deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException {
    ObjectMapper mapper = (ObjectMapper) jp.getCodec();
    JsonNode node = mapper.readTree(jp);
    Set<Object> resultSet = new HashSet<>();
    if (node != null) {
      if (node instanceof ArrayNode) {
        ArrayNode arrayNode = (ArrayNode) node;
        Iterator<JsonNode> nodeIterator = arrayNode.iterator();
        while (nodeIterator.hasNext()) {
          JsonNode elementNode = nodeIterator.next();
          resultSet.add(mapper.readValue(elementNode.traverse(mapper), Object.class));
        }
      } else {
        resultSet.add(mapper.readValue(node.traverse(mapper), Object.class));
      }
    }
    return Collections.unmodifiableSet(resultSet);
  }
}

代码示例来源：origin: embulk/embulk

@Override
public <E> E get(Class<E> type, String attrName) {
  JsonNode json = data.get(attrName);
  if (json == null) {
    throw new ConfigException("Attribute " + attrName + " is required but not set");
  }
  return model.readObject(type, json.traverse());
}

代码示例来源：origin: spring-projects/spring-security

Object principal = null;
if (principalNode.isObject()) {
  principal = mapper.readValue(principalNode.traverse(mapper), Object.class);
} else {
  principal = principalNode.asText();
    readJsonNode(jsonNode, "authorities").traverse(mapper), new TypeReference<List<GrantedAuthority>>() {
});
if (authenticated) {

代码示例来源：origin: org.springframework.security/spring-security-core

Object principal = null;
if (principalNode.isObject()) {
  principal = mapper.readValue(principalNode.traverse(mapper), Object.class);
} else {
  principal = principalNode.asText();
    readJsonNode(jsonNode, "authorities").traverse(mapper), new TypeReference<List<GrantedAuthority>>() {
});
if (authenticated) {

代码示例来源：origin: stackoverflow.com

JsonParser parser = node.traverse();
ObjectMapper mapper = new ObjectMapper();
return mapper.readValue(parser, wrappedType);

代码示例来源：origin: BroadleafCommerce/BroadleafCommerce

dataDTO.setRules((ArrayList<DataDTO>) mapper.readValue(element.getValue().traverse(jp.getCodec()), dtoCollectionType));

代码示例来源：origin: opentripplanner/OpenTripPlanner

@SuppressWarnings("unchecked")
public static PointFeature fromJsonNode(JsonNode feature) throws EmptyPolygonException,
    UnsupportedGeometryException {
  Feature geoJsonFeature;
  try {
    geoJsonFeature = deserializer.readValue(feature.traverse(), Feature.class);
  } catch (IOException e) {
    throw new UnsupportedGeometryException(e.getMessage());
  }
  PointFeature ret = new PointFeature(geoJsonFeature.getId());
  ret.setGeom(GeometryUtils.convertGeoJsonToJtsGeometry(geoJsonFeature.getGeometry()));
  Object structured = geoJsonFeature.getProperty("structured");
  if (structured == null || !(structured instanceof Map))
    return null;
  // The code below assume the structured map to have integers only
  ret.setAttributes((Map<String, Integer>)(structured));
  return ret;
}

代码示例来源：origin: Netflix/hollow

public static void print(JsonNode node) throws Exception {
  print(node.traverse());
}
public static void print(JsonParser parser) throws Exception {

代码示例来源：origin: spring-projects/spring-integration

@Override
public T convert(JsonNode root, DeserializationContext ctxt) throws IOException {
  Map<String, Object> headers = this.mapper.readValue(root.get("headers").traverse(),
      TypeFactory.defaultInstance().constructMapType(HashMap.class, String.class, Object.class));
  Object payload = this.mapper.readValue(root.get("payload").traverse(), this.payloadType);
  return buildMessage(new MutableMessageHeaders(headers), payload, root, ctxt);
}

代码示例来源：origin: stackoverflow.com

ObjectMapper mapper = new ObjectMapper();
 mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
 JsonNode node = mapper.readTree(new URL(url));
 node = node.get("duObjects");
 TypeReference<List<Dataset>> typeRef = new TypeReference<List<Dataset>>() {
 };
 List<Dataset> list = mapper.readValue(node.traverse(), typeRef);
 for (int i = 0; i < list.size(); i++) {
   Dataset dataSet = list.get(i);
   System.out.println(dataSet.getName());
 }

代码示例来源：origin: spring-projects/spring-kafka

@Override
public MimeType convert(JsonNode root, DeserializationContext ctxt) throws IOException {
  JsonNode type = root.get("type");
  JsonNode subType = root.get("subtype");
  JsonNode parameters = root.get("parameters");
  Map<String, String> params =
      DefaultKafkaHeaderMapper.this.objectMapper.readValue(parameters.traverse(),
          TypeFactory.defaultInstance()
              .constructMapType(HashMap.class, String.class, String.class));
  return new MimeType(type.asText(), subType.asText(), params);
}

代码示例来源：origin: spring-projects/spring-data-rest

@Override
  public Object evaluate(Class<?> type) {

    try {
      return mapper.readValue(valueNode.traverse(mapper.getFactory().getCodec()), type);
    } catch (Exception o_O) {
      throw new PatchException(String.format("Could not read %s into %s!", valueNode, type), o_O);
    }
  }
}

代码示例来源：origin: spring-projects/spring-integration

@Override
protected AdviceMessage<?> buildMessage(MutableMessageHeaders headers, Object payload, JsonNode root,
    DeserializationContext ctxt) throws IOException {
  Message<?> inputMessage = getMapper().readValue(root.get("inputMessage").traverse(), Message.class);
  return new AdviceMessage<Object>(payload, (MessageHeaders) headers, inputMessage);
}

代码示例来源：origin: spring-projects/spring-integration

@Override
protected ErrorMessage buildMessage(MutableMessageHeaders headers, Object payload, JsonNode root,
    DeserializationContext ctxt) throws IOException {
  Message<?> originalMessage = getMapper().readValue(root.get("originalMessage").traverse(), Message.class);
  return new ErrorMessage((Throwable) payload, headers, originalMessage);
}

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