本文整理了Java中com.fasterxml.jackson.databind.JsonNode.has()方法的一些代码示例，展示了JsonNode.has()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.has()方法的具体详情如下：
包路径：com.fasterxml.jackson.databind.JsonNode
类名称：JsonNode
方法名：has

JsonNode.has介绍

[英]Method that allows checking whether this node is JSON Array node and contains a value for specified index If this is the case (including case of specified indexing having null as value), returns true; otherwise returns false.

Note: array element indexes are 0-based.

This method is equivalent to:

node.get(index) != null

NOTE: this method will return true for explicitly added null values.
[中]方法，该方法允许检查此节点是否为JSON数组节点，并包含指定索引的值（如果是这种情况（包括指定索引的值为null的情况），返回true；否则返回false。
注意：数组元素索引是基于0的。
此方法相当于：

node.get(index) != null

注意：对于显式添加的空值，此方法将返回true。

代码示例

代码示例来源：origin: aws/aws-sdk-java

/**
   * Get a string field from the JSON.
   *
   * @param fieldName Name of field to get.
   * @return String value or null if not present.
   */
  private String getString(String fieldName) {
    return source.has(fieldName) ? source.get(fieldName).asText() : null;
  }
}

代码示例来源：origin: joelittlejohn/jsonschema2pojo

/**
 * Get name of the field generated from property.
 *
 * @param propertyName
 * @param node
 * @return
 */
public String getFieldName(String propertyName, JsonNode node) {
  if (node != null && node.has("javaName")) {
    propertyName = node.get("javaName").textValue();
  }
  return propertyName;
}

代码示例来源：origin: Activiti/Activiti

public static Set<String> gatherStringPropertyFromJsonNodes(Iterable<JsonNode> jsonNodes, String propertyName) {
 Set<String> result = new HashSet<String>(); // Using a Set to filter out doubles
 for (JsonNode node : jsonNodes) {
  if (node.has(propertyName)) {
   String propertyValue = node.get(propertyName).asText();
   if (propertyValue != null) { // Just to be safe
    result.add(propertyValue);
   }
  }
 }
 return result;
}

代码示例来源：origin: Activiti/Activiti

public static List<JsonNode> getAppModelReferencedProcessModels(JsonNode appModelJson) {
 List<JsonNode> result = new ArrayList<JsonNode>();
 if (appModelJson.has("models")) {
  ArrayNode modelsArrayNode = (ArrayNode) appModelJson.get("models");
  Iterator<JsonNode> modelArrayIterator = modelsArrayNode.iterator();
  while (modelArrayIterator.hasNext()) {
   result.add(modelArrayIterator.next());
  }
 }
 return result;
}

代码示例来源：origin: aws/aws-sdk-java

/**
 * Get a String field from the JSON.
 *
 * @param json      JSON document.
 * @param fieldName Field name to get.
 * @return String value of field or null if not present.
 */
private String getTextField(JsonNode json, String fieldName) {
  if (!json.has(fieldName)) {
    return null;
  }
  return json.get(fieldName).asText();
}

代码示例来源：origin: Activiti/Activiti

public static Set<String> getAppModelReferencedModelIds(JsonNode appModelJson) {
 if (appModelJson.has("models")) {
  return JsonConverterUtil.gatherStringPropertyFromJsonNodes(appModelJson.get("models"), "id");
 }
 return Collections.emptySet();
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("CodeCell");
 }
}

代码示例来源：origin: joelittlejohn/jsonschema2pojo

public String getClassName(String propertyName, JsonNode node) {
  if (node != null) {
    if (node.has("javaName")) {
      propertyName = node.get("javaName").textValue();
    } else if (generationConfig.isUseTitleAsClassname() && node.has("title")) {
      String title = node.get("title").textValue();
      propertyName = WordUtils.capitalize(title).replaceAll(" ", "");
    }
  }
  return propertyName;
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("TabbedOutputContainerLayoutManager");
 }
}

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

private JsonNode readJsonNode(JsonNode jsonNode, String field) {
    return jsonNode.has(field) ? jsonNode.get(field) : MissingNode.getInstance();
  }
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("UpdatableEvaluationResult");
 }
}

代码示例来源：origin: joelittlejohn/jsonschema2pojo

@Override
public JFieldVar apply(String nodeName, JsonNode node, JsonNode parent, JFieldVar field, Schema currentSchema) {
  
  if (ruleFactory.getGenerationConfig().isIncludeJsr303Annotations()
      && (node.has("minLength") || node.has("maxLength"))) {
    JAnnotationUse annotation = field.annotate(Size.class);
    if (node.has("minLength")) {
      annotation.param("min", node.get("minLength").asInt());
    }
    if (node.has("maxLength")) {
      annotation.param("max", node.get("maxLength").asInt());
    }
  }
  return field;
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("OutputContainerCell");
 }
}

代码示例来源：origin: joelittlejohn/jsonschema2pojo

@Override
public JFieldVar apply(String nodeName, JsonNode node, JsonNode parent, JFieldVar field, Schema currentSchema) {
  if (ruleFactory.getGenerationConfig().isIncludeJsr303Annotations()
      && (node.has("minItems") || node.has("maxItems"))) {
    JAnnotationUse annotation = field.annotate(Size.class);
    if (node.has("minItems")) {
      annotation.param("min", node.get("minItems").asInt());
    }
    if (node.has("maxItems")) {
      annotation.param("max", node.get("maxItems").asInt());
    }
  }
  return field;
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("TableDisplay");
 }
}

代码示例来源：origin: joelittlejohn/jsonschema2pojo

/**
 * Returns the JType for an integer field. Handles type lookup and unboxing.
 */
private JType getIntegerType(JCodeModel owner, JsonNode node, GenerationConfig config) {
  if (config.isUseBigIntegers()) {
    return unboxIfNecessary(owner.ref(BigInteger.class), config);
  } else if (config.isUseLongIntegers() ||
      node.has("minimum") && node.get("minimum").isLong() ||
      node.has("maximum") && node.get("maximum").isLong()) {
    return unboxIfNecessary(owner.ref(Long.class), config);
  } else {
    return unboxIfNecessary(owner.ref(Integer.class), config);
  }
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("SimpleLayoutManager");
 }
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("CyclingOutputContainerLayoutManager");
 }
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("OutputContainer");
 }
}

代码示例来源：origin: twosigma/beakerx

@Override
 public boolean canBeUsed(JsonNode n) {
  return n.has("type") && n.get("type").asText().equals("TableDisplay");
 }
}