本文整理了Java中org.apache.sling.commons.json.JSONObject.opt()方法的一些代码示例，展示了JSONObject.opt()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。JSONObject.opt()方法的具体详情如下：
包路径：org.apache.sling.commons.json.JSONObject
类名称：JSONObject
方法名：opt

JSONObject.opt介绍

[英]Get an optional value associated with a key.
[中]获取与键关联的可选值。

代码示例

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Get an optional JSONObject associated with a key.
 * It returns null if there is no such key, or if its value is not a
 * JSONObject.
 *
 * @param key   A key string.
 * @return      A JSONObject which is the value.
 */
public JSONObject optJSONObject(String key) {
  Object o = opt(key);
  return o instanceof JSONObject ? (JSONObject)o : null;
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Append a JSON Object
 *
 * @param o
 * @return
 * @throws JSONException
 */
public JSONWriter writeObject(JSONObject o) throws JSONException {
  Iterator<String> keys = o.keys();
  this.object();
  while (keys.hasNext()) {
    String key = keys.next();
    this.key(key);
    JSONObject objVal = o.optJSONObject(key);
    if (objVal != null) {
      this.writeObject(objVal);
      continue;
    }
    JSONArray arrVal = o.optJSONArray(key);
    if (arrVal != null) {
      this.writeArray(arrVal);
      continue;
    }
    Object obj = o.opt(key);
    this.value(obj);
  }
  this.endObject();
  return this;
}

代码示例来源：origin: io.wcm/io.wcm.handler.richtext

Object value = metadata.opt(metadataPropertyName);
if (value != null) {
 resourceProps.put(metadataPropertyName, value);

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Get an optional JSONArray associated with a key.
 * It returns null if there is no such key, or if its value is not a
 * JSONArray.
 *
 * @param key   A key string.
 * @return      A JSONArray which is the value.
 */
public JSONArray optJSONArray(String key) {
  Object o = opt(key);
  return o instanceof JSONArray ? (JSONArray)o : null;
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Determine if the value associated with the key is null or if there is
 *  no value.
 * @param key   A key string.
 * @return      true if there is no value associated with the key or if
 *  the value is the JSONObject.NULL object.
 */
public boolean isNull(String key) {
  return JSONObject.NULL.equals(opt(key));
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Get an optional string associated with a key.
 * It returns the defaultValue if there is no such key.
 *
 * @param key   A key string.
 * @param defaultValue     The default.
 * @return      A string which is the value.
 */
public String optString(String key, String defaultValue) {
  Object o = opt(key);
  return o != null ? o.toString() : defaultValue;
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Get an optional double associated with a key, or the
 * defaultValue if there is no such key or if its value is not a number.
 * If the value is a string, an attempt will be made to evaluate it as
 * a number.
 *
 * @param key   A key string.
 * @param defaultValue     The default.
 * @return      An object which is the value.
 */
public double optDouble(String key, double defaultValue) {
  try {
    Object o = opt(key);
    return o instanceof Number ? ((Number)o).doubleValue() :
      new Double((String)o).doubleValue();
  } catch (Exception e) {
    return defaultValue;
  }
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Construct a JSONObject from a subset of another JSONObject.
 * An array of strings is used to identify the keys that should be copied.
 * Missing keys are ignored.
 * @param jo A JSONObject.
 * @param sa An array of strings.
 * @exception JSONException If a value is a non-finite number.
 */
public JSONObject(JSONObject jo, String[] sa) throws JSONException {
  this(); // basic setup
  for (int i = 0; i < sa.length; i += 1) {
    putOpt(sa[i], jo.opt(sa[i]));
  }
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/** Render the supplied JSONObject to a String, in
 *  the simplest possible way.
 */
public String toString(JSONObject jo) {
  try {
    final Iterator<String> keys = jo.keys();
    final StringBuffer sb = new StringBuffer("{");
    while (keys.hasNext()) {
      if (sb.length() > 1) {
        sb.append(',');
      }
      String o = keys.next();
      sb.append(quote(o));
      sb.append(':');
      sb.append(valueToString(jo.opt(o)));
    }
    sb.append('}');
    return sb.toString();
  } catch (Exception e) {
    return null;
  }
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Get the value object associated with a key.
 *
 * @param key   A key string.
 * @return      The object associated with the key.
 * @throws   JSONException if the key is not found.
 */
public Object get(String key) throws JSONException {
  Object o = opt(key);
  if (o == null) {
    throw new JSONException("JSONObject[" + quote(key) +
        "] not found.");
  }
  return o;
}

代码示例来源：origin: io.wcm/io.wcm.testing.sling-mock

Object primaryTypeObj = jsonObject.opt(JcrConstants.JCR_PRIMARYTYPE);
String primaryType = null;
if (primaryTypeObj != null) {

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Produce a JSONArray containing the values of the members of this
 * JSONObject.
 * @param names A JSONArray containing a list of key strings. This
 * determines the sequence of the values in the result.
 * @return A JSONArray of values.
 * @throws JSONException If any of the values are non-finite numbers.
 */
public JSONArray toJSONArray(JSONArray names) throws JSONException {
  if (names == null || names.length() == 0) {
    return null;
  }
  JSONArray ja = new JSONArray();
  for (int i = 0; i < names.length(); i += 1) {
    ja.put(this.opt(names.getString(i)));
  }
  return ja;
}

代码示例来源：origin: io.wcm/io.wcm.handler.richtext

/**
 * Support legacy data structures where link metadata is stored as JSON fragment in single HTML5 data attribute.
 * @param resourceProps ValueMap to write link metadata to
 * @param element Link element
 */
private boolean getAnchorLegacyMetadataFromSingleData(ValueMap resourceProps, Element element) {
 boolean foundAny = false;
 JSONObject metadata = null;
 Attribute dataAttribute = element.getAttribute("data");
 if (dataAttribute != null) {
  String metadataString = dataAttribute.getValue();
  if (StringUtils.isNotEmpty(metadataString)) {
   try {
    metadata = new JSONObject(metadataString);
   }
   catch (JSONException ex) {
    log.debug("Invalid link metadata: " + metadataString, ex);
   }
  }
 }
 if (metadata != null) {
  JSONArray names = metadata.names();
  for (int i = 0; i < names.length(); i++) {
   String name = names.optString(i);
   resourceProps.put(name, metadata.opt(name));
   foundAny = true;
  }
 }
 return foundAny;
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Accumulate values under a key. It is similar to the put method except
 * that if there is already an object stored under the key then a
 * JSONArray is stored under the key to hold all of the accumulated values.
 * If there is already a JSONArray, then the new value is appended to it.
 * In contrast, the put method replaces the previous value.
 * @param key   A key string.
 * @param value An object to be accumulated under the key.
 * @return this.
 * @throws JSONException If the value is an invalid number
 *  or if the key is null.
 */
public JSONObject accumulate(String key, Object value)
    throws JSONException {
  testValidity(value);
  Object o = opt(key);
  if (o == null) {
    put(key, value);
  } else if (o instanceof JSONArray) {
    ((JSONArray)o).put(value);
  } else {
    put(key, new JSONArray().put(o).put(value));
  }
  return this;
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

/**
 * Append values to the array under a key. If the key does not exist in the
 * JSONObject, then the key is put in the JSONObject with its value being a
 * JSONArray containing the value parameter. If the key was already
 * associated with a JSONArray, then the value parameter is appended to it.
 * @param key   A key string.
 * @param value An object to be accumulated under the key.
 * @return this.
 * @throws JSONException If the key is null or if the current value
 *     associated with the key is not a JSONArray.
 */
public JSONObject append(String key, Object value)
    throws JSONException {
  testValidity(value);
  Object o = opt(key);
  if (o == null) {
    put(key, new JSONArray().put(value));
  } else if (o instanceof JSONArray) {
    put(key, new JSONArray().put(o).put(value));
  } else {
    throw new JSONException("JSONObject[" + key +
        "] is not a JSONArray.");
  }
  return this;
}

代码示例来源：origin: org.apache.sling/org.apache.sling.commons.json

context.accumulate(n, "");
} else if (o.length() == 1 &&
    o.opt("content") != null) {
  context.accumulate(n, o.opt("content"));
} else {
  context.accumulate(n, o);