Package io.microsphere.json

Class JSONUtils

  • All Implemented Interfaces:
    Utils
    public abstract class JSONUtils
extends java.lang.Object
implements Utils
    Utility class for generating and manipulating JSON strings.

    This abstract class provides a set of static methods to append different types of data into a JSON-formatted string using a StringBuilder. It supports primitive types, their wrapper classes, arrays (both primitive and object), collections like Map, Iterable, and custom objects through recursive value appending.

    Example Usage

    
 StringBuilder builder = new StringBuilder();

 // Appending simple key-value pairs:
 JSONUtils.append(builder, "name", "John Doe");
 // Result: {"name":"John Doe"}

 // Appending nested objects:
 JSONUtils.append(builder, "user", Map.of("id", 1, "active", true));
 // Result: {"user":{"id":1,"active":true}}

 // Appending arrays:
 JSONUtils.append(builder, "numbers", new int[]{1, 2, 3});
 // Result: {"numbers":[1,2,3]}

 // Appending collections:
 JSONUtils.append(builder, "tags", List.of("java", "json", "utils"));
 // Result: {"tags":["java","json","utils"]}
    Since:
    1.0.0
    Author:
    Mercy
    See Also:
    StringBuilder

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, boolean value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, boolean[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, byte value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, byte[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, char value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, char[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, double value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, double[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, float value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, float[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, int value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, int[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, long value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, long[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, short value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, short[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Boolean value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Boolean[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Byte value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Byte[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Character value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Character[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Double value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Double[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Float value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Float[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Integer value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Integer[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Long value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Long[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Object value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.reflect.Type value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Short value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.Short[] values)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.String value)  
      static void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, java.lang.String[] values)  
      static <T> void append​(java.lang.StringBuilder jsonBuilder, java.lang.String name, T[] values)  
      static java.lang.StringBuilder appendName​(java.lang.StringBuilder jsonBuilder, java.lang.String name)  
      static void appendValue​(java.lang.StringBuilder jsonBuilder, java.lang.Object value)  
      static java.lang.Class<?> determineElementClass​(JSONArray jsonArray)
      Determines the common class of elements in the given JSONArray.
      static boolean isEmpty​(JSONArray jsonArray)
      Checks if the given JSONArray is empty.
      static boolean isEmpty​(JSONObject jsonObject)
      Checks if the given JSONObject is empty.
      static boolean isJSONArray​(java.lang.Object value)
      Checks if the given object is an instance of JSONArray.
      static boolean isJSONObject​(java.lang.Object value)
      Checks if the given object is an instance of JSONObject.
      static boolean isNotEmpty​(JSONArray jsonArray)
      Checks if the given JSONArray is not empty.
      static boolean isNotEmpty​(JSONObject jsonObject)
      Checks if the given JSONObject is not empty.
      static boolean isNotNull​(java.lang.Object object)
      Checks if the given object is not null and not equal to JSONObject.NULL.
      static boolean isNull​(java.lang.Object object)
      Checks if the given object is null or equals to JSONObject.NULL.
      static JSONArray jsonArray​(java.lang.String json)
      Parses a JSON string and returns a JSONArray representation of it.
      static JSONObject jsonObject​(java.lang.String json)
      Parses a JSON string and returns a JSONObject representation of it.
      static int length​(JSONArray jsonArray)
      Returns the number of values in the specified JSONArray.
      static int length​(JSONObject jsonObject)
      Returns the number of name/value mappings in the specified JSONObject.
      static <E> E[] readArray​(JSONArray jsonArray, java.lang.Class<E> componentType)
      Reads a JSONArray and converts it into an array of the specified component type.
      static <E> E[] readArray​(java.lang.String json, java.lang.Class<E> componentType)
      Reads a JSON array string and converts it into an array of the specified component type.
      static <V> V readValue​(JSONObject jsonObject, java.lang.Class<V> targetType)
      Reads a JSONObject and converts it into an instance of the specified target type.
      static <V> V readValue​(java.lang.String json, java.lang.Class<V> targetType)
      Reads a JSON string and converts it into an instance of the specified target type.
      static <V> V readValueAsBean​(JSONObject jsonObject, java.lang.Class<V> beanClass)
      Reads a JSONObject and converts it into an instance of the specified bean type.
      static java.util.Map<java.lang.String,​java.lang.Object> readValueAsMap​(JSONObject jsonObject)
      Reads a JSONObject and converts it into a Map with String keys and Object values.
      static <V> V readValues​(JSONArray jsonArray, java.lang.Class<V> multipleClass, java.lang.Class<?> elementClass)
      Reads a JSONArray and converts it into an instance of the specified collection or array type.
      static java.lang.Object readValues​(JSONArray jsonArray, java.lang.reflect.Type targetType)
      Reads a JSONArray and converts it into an instance of the specified target type.
      static <V> V readValues​(java.lang.String json, java.lang.Class<V> multipleClass, java.lang.Class<?> elementClass)
      Reads a JSON array string and converts it into an instance of the specified collection or array type.
      static java.lang.String writeBeanAsString​(java.lang.Object javaBean)
      Converts a JavaBean object into its JSON string representation.
      static java.lang.String writeValueAsString​(java.lang.Object object)
      Converts an object into its JSON string representation.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          boolean value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          byte value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          short value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          int value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          long value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          float value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          double value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          char value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Boolean value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Byte value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Short value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Integer value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Long value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Float value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Double value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Character value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.String value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.reflect.Type value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Object value)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          boolean[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          byte[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          short[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          int[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          long[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          float[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          double[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          char[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.String[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Boolean[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Byte[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Short[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Integer[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Long[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Float[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Double[] values)

      • append

        public static void append​(java.lang.StringBuilder jsonBuilder,
                          java.lang.String name,
                          java.lang.Character[] values)

      • append

        public static <T> void append​(java.lang.StringBuilder jsonBuilder,
                              java.lang.String name,
                              T[] values)

      • appendValue

        public static void appendValue​(java.lang.StringBuilder jsonBuilder,
                               java.lang.Object value)

      • appendName

        public static java.lang.StringBuilder appendName​(java.lang.StringBuilder jsonBuilder,
                                                 java.lang.String name)

      • length

        public static int length​(JSONObject jsonObject)
        Returns the number of name/value mappings in the specified JSONObject.

        This method returns the count of key-value pairs in the given JSONObject. If the JSONObject is null, this method returns 0.

        Example Usage

        
 JSONObject obj = new JSONObject();
 obj.put("name", "John");
 obj.put("age", 30);
 int length = JSONUtils.length(obj); // returns 2

 JSONObject nullObj = null;
 int nullLength = JSONUtils.length(nullObj); // returns 0
        Parameters:
        jsonObject - the JSONObject whose length is to be determined
        Returns:
        the number of name/value mappings in the JSONObject, or 0 if the JSONObject is null
        See Also:
        JSONObject.length()

      • length

        public static int length​(JSONArray jsonArray)
        Returns the number of values in the specified JSONArray.

        This method returns the count of elements in the given JSONArray. If the JSONArray is null, this method returns 0.

        Example Usage

        
 JSONArray array = new JSONArray();
 array.put("value1");
 array.put("value2");
 int length = JSONUtils.length(array); // returns 2

 JSONArray nullArray = null;
 int nullLength = JSONUtils.length(nullArray); // returns 0
        Parameters:
        jsonArray - the JSONArray whose length is to be determined
        Returns:
        the number of values in the JSONArray, or 0 if the JSONArray is null
        See Also:
        JSONArray.length()

      • isEmpty

        public static boolean isEmpty​(JSONObject jsonObject)
        Checks if the given JSONObject is empty.

        This method returns true if the provided JSONObject is null or contains no key-value mappings. Otherwise, it returns false.

        Example Usage

        
 JSONObject obj = new JSONObject();
 boolean empty = JSONUtils.isEmpty(obj); // returns true

 obj.put("key", "value");
 boolean notEmpty = JSONUtils.isEmpty(obj); // returns false

 JSONObject nullObj = null;
 boolean nullEmpty = JSONUtils.isEmpty(nullObj); // returns true
        Parameters:
        jsonObject - the JSONObject to check
        Returns:
        true if the JSONObject is null or empty, false otherwise
        See Also:
        length(JSONObject), JSONObject.length()

      • isEmpty

        public static boolean isEmpty​(JSONArray jsonArray)
        Checks if the given JSONArray is empty.

        This method returns true if the provided JSONArray is null or contains no elements. Otherwise, it returns false.

        Example Usage

        
 JSONArray array = new JSONArray();
 boolean empty = JSONUtils.isEmpty(array); // returns true

 array.put("value");
 boolean notEmpty = JSONUtils.isEmpty(array); // returns false

 JSONArray nullArray = null;
 boolean nullEmpty = JSONUtils.isEmpty(nullArray); // returns true
        Parameters:
        jsonArray - the JSONArray to check
        Returns:
        true if the JSONArray is null or empty, false otherwise
        See Also:
        length(JSONArray), JSONArray.length()

      • isNotEmpty

        public static boolean isNotEmpty​(JSONObject jsonObject)
        Checks if the given JSONObject is not empty.

        This method returns true if the provided JSONObject is not null and contains at least one key-value mapping. Otherwise, it returns false.

        Example Usage

        
 JSONObject obj = new JSONObject();
 boolean empty = JSONUtils.isNotEmpty(obj); // returns false

 obj.put("key", "value");
 boolean notEmpty = JSONUtils.isNotEmpty(obj); // returns true

 JSONObject nullObj = null;
 boolean nullEmpty = JSONUtils.isNotEmpty(nullObj); // returns false
        Parameters:
        jsonObject - the JSONObject to check
        Returns:
        true if the JSONObject is not null and not empty, false otherwise
        See Also:
        isEmpty(JSONObject), JSONObject.length()

      • isNotEmpty

        public static boolean isNotEmpty​(JSONArray jsonArray)
        Checks if the given JSONArray is not empty.

        This method returns true if the provided JSONArray is not null and contains at least one element. Otherwise, it returns false.

        Example Usage

        
 JSONArray array = new JSONArray();
 boolean empty = JSONUtils.isNotEmpty(array); // returns false

 array.put("value");
 boolean notEmpty = JSONUtils.isNotEmpty(array); // returns true

 JSONArray nullArray = null;
 boolean nullEmpty = JSONUtils.isNotEmpty(nullArray); // returns false
        Parameters:
        jsonArray - the JSONArray to check
        Returns:
        true if the JSONArray is not null and not empty, false otherwise
        See Also:
        isEmpty(JSONArray), JSONArray.length()

      • isNull

        public static boolean isNull​(java.lang.Object object)
        Checks if the given object is null or equals to JSONObject.NULL.

        This method returns true if the provided object is null or is equal to JSONObject.NULL, which is a special sentinel value used in JSON operations. Otherwise, it returns false.

        Example Usage

        
 boolean result1 = JSONUtils.isNull(null); // returns true
 boolean result2 = JSONUtils.isNull(JSONObject.NULL); // returns true
 boolean result3 = JSONUtils.isNull("some value"); // returns false
        Parameters:
        object - the object to check
        Returns:
        true if the object is null or equals to JSONObject.NULL, false otherwise
        See Also:
        JSONObject.NULL

      • isNotNull

        public static boolean isNotNull​(java.lang.Object object)
        Checks if the given object is not null and not equal to JSONObject.NULL.

        This method returns true if the provided object is neither null nor equal to JSONObject.NULL, which is a special sentinel value used in JSON operations. Otherwise, it returns false.

        Example Usage

        
 boolean result1 = JSONUtils.isNotNull("some value"); // returns true
 boolean result2 = JSONUtils.isNotNull(JSONObject.NULL); // returns false
 boolean result3 = JSONUtils.isNotNull(null); // returns false
        Parameters:
        object - the object to check
        Returns:
        true if the object is not null and not equal to JSONObject.NULL, false otherwise
        See Also:
        JSONObject.NULL, isNull(Object)

      • isJSONObject

        public static boolean isJSONObject​(java.lang.Object value)
        Checks if the given object is an instance of JSONObject.

        This method returns true if the provided object is an instance of JSONObject, and false otherwise. It is useful for type checking before performing operations specific to JSONObject.

        Example Usage

        
 Object obj = new JSONObject();
 boolean result = JSONUtils.isJSONObject(obj); // returns true

 Object str = "not a JSONObject";
 boolean result2 = JSONUtils.isJSONObject(str); // returns false
        Parameters:
        value - the object to check
        Returns:
        true if the object is an instance of JSONObject, false otherwise
        See Also:
        JSONObject

      • isJSONArray

        public static boolean isJSONArray​(java.lang.Object value)
        Checks if the given object is an instance of JSONArray.

        This method returns true if the provided object is an instance of JSONArray, and false otherwise. It is useful for type checking before performing operations specific to JSONArray.

        Example Usage

        
 Object obj = new JSONArray();
 boolean result = JSONUtils.isJSONArray(obj); // returns true

 Object str = "not a JSONArray";
 boolean result2 = JSONUtils.isJSONArray(str); // returns false
        Parameters:
        value - the object to check
        Returns:
        true if the object is an instance of JSONArray, false otherwise
        See Also:
        JSONArray

      • jsonObject

        @Nonnull
public static JSONObject jsonObject​(java.lang.String json)
                             throws java.lang.IllegalArgumentException
        Parses a JSON string and returns a JSONObject representation of it.

        This method takes a valid JSON string and converts it into a JSONObject. If the string is not a valid JSON or cannot be parsed into a JSONObject, an IllegalArgumentException will be thrown with the underlying JSONException as the cause.

        Example Usage

        
 String jsonString = "{\"name\":\"John\", \"age\":30}";
 JSONObject jsonObject = JSONUtils.jsonObject(jsonString);
 String name = jsonObject.getString("name"); // "John"
 int age = jsonObject.getInt("age");        // 30

 // Invalid JSON example:
 try {
     JSONUtils.jsonObject("{invalid json}");
 } catch (IllegalArgumentException e) {
     // Handle parsing error
 }
        Parameters:
        json - the JSON string to parse
        Returns:
        a JSONObject representation of the parsed JSON string
        Throws:
        java.lang.IllegalArgumentException - if the string is not valid JSON or cannot be parsed

      • jsonArray

        @Nonnull
public static JSONArray jsonArray​(java.lang.String json)
                           throws java.lang.IllegalArgumentException
        Parses a JSON string and returns a JSONArray representation of it.

        This method takes a valid JSON string and converts it into a JSONArray. If the string is not a valid JSON or cannot be parsed into a JSONArray, an IllegalArgumentException will be thrown with the underlying JSONException as the cause.

        Example Usage

        
 String jsonString = "[\"apple\", \"banana\", \"cherry\"]";
 JSONArray jsonArray = JSONUtils.jsonArray(jsonString);
 String firstItem = jsonArray.getString(0); // "apple"
 int length = jsonArray.length();           // 3

 // Invalid JSON example:
 try {
     JSONUtils.jsonArray("[invalid json]");
 } catch (IllegalArgumentException e) {
     // Handle parsing error
 }
        Parameters:
        json - the JSON string to parse
        Returns:
        a JSONArray representation of the parsed JSON string
        Throws:
        java.lang.IllegalArgumentException - if the string is not valid JSON or cannot be parsed
        See Also:
        JSONArray

      • readValue

        @Nonnull
public static <V> V readValue​(java.lang.String json,
                              java.lang.Class<V> targetType)
        Reads a JSON string and converts it into an instance of the specified target type.

        This method parses the provided JSON string into a JSONObject and then maps its properties to a new instance of the target type. It supports nested objects, collections, and type conversion where necessary.

        Example Usage

        
 String json = "{\"name\":\"John Doe\",\"age\":30}";
 Person person = JSONUtils.readValue(json, Person.class);
 // person.getName() returns "John Doe"
 // person.getAge() returns 30

 String nestedJson = "{\"user\":{\"name\":\"Jane\"},\"active\":true}";
 MyBean bean = JSONUtils.readValue(nestedJson, MyBean.class);
 // bean.getUser().getName() returns "Jane"
 // bean.isActive() returns true
        Type Parameters:
        V - the type of the target object
        Parameters:
        json - the JSON string to parse and convert
        targetType - the class of the target type to which the JSON should be converted
        Returns:
        an instance of the target type populated with data from the JSON string
        Throws:
        java.lang.IllegalArgumentException - if the JSON string is invalid or cannot be converted to the target type
        See Also:
        JSONObject, readValue(JSONObject, Class)

      • readValue

        @Nonnull
public static <V> V readValue​(JSONObject jsonObject,
                              java.lang.Class<V> targetType)
        Reads a JSONObject and converts it into an instance of the specified target type.

        This method takes a JSONObject and maps its properties to a new instance of the target type. It supports nested objects, collections, and type conversion where necessary.

        Example Usage

        
 JSONObject jsonObject = new JSONObject("{\"name\":\"John Doe\",\"age\":30}");
 Map<String, Object> map = JSONUtils.readValueAsMap(jsonObject);
 // map.get("name") returns "John Doe"
 // map.get("age") returns 30

 JSONObject nestedJsonObject = new JSONObject("{\"user\":{\"name\":\"Jane\"},\"active\":true}");
 MyBean bean = JSONUtils.readValue(nestedJsonObject, MyBean.class);
 // bean.getUser().getName() returns "Jane"
 // bean.isActive() returns true
        Type Parameters:
        V - the type of the target object
        Parameters:
        jsonObject - the JSONObject to parse and convert
        targetType - the class of the target type to which the JSON should be converted
        Returns:
        an instance of the target type populated with data from the JSONObject
        Throws:
        java.lang.IllegalArgumentException - if the JSONObject cannot be converted to the target type
        See Also:
        JSONObject, readValue(String, Class)

      • readValueAsMap

        public static java.util.Map<java.lang.String,​java.lang.Object> readValueAsMap​(JSONObject jsonObject)
        Reads a JSONObject and converts it into a Map with String keys and Object values.

        This method takes a JSONObject and maps its properties to a new Map. Each key-value pair in the JSONObject is added to the map, with values being converted if necessary.

        Example Usage

        
 JSONObject jsonObject = new JSONObject("{\"name\":\"John Doe\",\"age\":30}");
 Map<String, Object> map = JSONUtils.readValueAsMap(jsonObject);
 // map.get("name") returns "John Doe"
 // map.get("age") returns 30

 JSONObject nestedJsonObject = new JSONObject("{\"user\":{\"name\":\"Jane\"},\"active\":true}");
 Map<String, Object> nestedMap = JSONUtils.readValueAsMap(nestedJsonObject);
 // nestedMap.get("user") returns a Map representing the user object
 // nestedMap.get("active") returns true
        Parameters:
        jsonObject - the JSONObject to parse and convert
        Returns:
        a Map populated with data from the JSONObject
        See Also:
        JSONObject

      • readValueAsBean

        @Nonnull
public static <V> V readValueAsBean​(JSONObject jsonObject,
                                    java.lang.Class<V> beanClass)
        Reads a JSONObject and converts it into an instance of the specified bean type.

        This method takes a JSONObject and maps its properties to a new instance of the bean type. It supports nested objects, collections, and type conversion where necessary.

        Example Usage

        
 JSONObject jsonObject = new JSONObject("{\"name\":\"John Doe\",\"age\":30}");
 Person person = JSONUtils.readValue(jsonObject, Person.class);
 // person.getName() returns "John Doe"
 // person.getAge() returns 30

 JSONObject nestedJsonObject = new JSONObject("{\"user\":{\"name\":\"Jane\"},\"active\":true}");
 MyBean bean = JSONUtils.readValue(nestedJsonObject, MyBean.class);
 // bean.getUser().getName() returns "Jane"
 // bean.isActive() returns true
        Type Parameters:
        V - the type of the target object
        Parameters:
        jsonObject - the JSONObject to parse and convert
        beanClass - the class of the Bean to which the JSON should be converted
        Returns:
        an instance of the bean type populated with data from the JSONObject
        Throws:
        java.lang.IllegalArgumentException - if the JSONObject cannot be converted to the bean type
        See Also:
        JSONObject, readValue(String, Class)

      • readValues

        @Nullable
public static <V> V readValues​(java.lang.String json,
                               java.lang.Class<V> multipleClass,
                               java.lang.Class<?> elementClass)
        Reads a JSON array string and converts it into an instance of the specified collection or array type.

        This method parses the provided JSON array string into a JSONArray and then maps its elements to a new instance of the specified collection or array type. It supports arrays, List, Set, Queue, and Enumeration.

        Example Usage

        
 String json = "[\"apple\", \"banana\", \"cherry\"]";

 // Convert to String array
 String[] stringArray = (String[]) JSONUtils.readValues(json, String[].class, String.class);

 // Convert to List<String>
 List<String> stringList = (List<String>) JSONUtils.readValues(json, List.class, String.class);

 // Convert to Set<String>
 Set<String> stringSet = (Set<String>) JSONUtils.readValues(json, Set.class, String.class);
        Parameters:
        json - the JSON array string to parse and convert
        multipleClass - the class of the target collection or array type to which the JSON should be converted
        elementClass - the class of the elements in the target collection or array
        Returns:
        an instance of the target collection or array type populated with data from the JSON array string, or null if the target type is not supported
        Throws:
        java.lang.IllegalArgumentException - if the JSON string is invalid or cannot be parsed into a JSONArray
        See Also:
        JSONArray, readValues(JSONArray, Class, Class)

      • readValues

        @Nullable
public static java.lang.Object readValues​(JSONArray jsonArray,
                                          java.lang.reflect.Type targetType)
        Reads a JSONArray and converts it into an instance of the specified target type.

        This method takes a JSONArray and maps its elements to a new instance of the specified target type. It supports arrays, List, Set, Queue, and Enumeration.

        Example Usage

        
 JSONArray jsonArray = new JSONArray("[\"apple\", \"banana\", \"cherry\"]");

 // Convert to String array
 String[] stringArray = (String[]) JSONUtils.readValues(jsonArray, String[].class);

 // Convert to List<String>
 List<String> stringList = (List<String>) JSONUtils.readValues(jsonArray, List.class);

 // Convert to Set<String>
 Set<String> stringSet = (Set<String>) JSONUtils.readValues(jsonArray, Set.class);
        Parameters:
        jsonArray - the JSONArray to parse and convert
        targetType - the target type to which the JSON should be converted, it can be an array, List, Set, Queue, or Enumeration
        Returns:
        an instance of the target type populated with data from the JSONArray, or null if the target type is not supported or the JSONArray is empty
        See Also:
        JSONArray, readValues(JSONArray, Class, Class)

      • readValues

        @Nullable
public static <V> V readValues​(JSONArray jsonArray,
                               java.lang.Class<V> multipleClass,
                               java.lang.Class<?> elementClass)
        Reads a JSONArray and converts it into an instance of the specified collection or array type.

        This method takes a JSONArray and maps its elements to a new instance of the specified collection or array type. It supports arrays, List, Set, Queue, and Enumeration.

        Example Usage

        
 JSONArray jsonArray = new JSONArray("[\"apple\", \"banana\", \"cherry\"]");

 // Convert to String array
 String[] stringArray = (String[]) JSONUtils.readValues(jsonArray, String[].class, String.class);

 // Convert to List<String>
 List<String> stringList = (List<String>) JSONUtils.readValues(jsonArray, List.class, String.class);

 // Convert to Set<String>
 Set<String> stringSet = (Set<String>) JSONUtils.readValues(jsonArray, Set.class, String.class);
        Parameters:
        jsonArray - the JSONArray to parse and convert
        multipleClass - the class of the target collection or array type to which the JSON should be converted
        elementClass - the class of the elements in the target collection or array
        Returns:
        an instance of the target collection or array type populated with data from the JSONArray, or null if the target type is not supported
        See Also:
        JSONArray, readValues(String, Class, Class)

      • readArray

        public static <E> E[] readArray​(java.lang.String json,
                                java.lang.Class<E> componentType)
        Reads a JSON array string and converts it into an array of the specified component type.

        This method parses the provided JSON array string into a JSONArray and then maps its elements to a new array of the specified component type. It supports arrays of any type, including primitives and their wrapper classes.

        Example Usage

        
 String json = "[\"apple\", \"banana\", \"cherry\"]";
 String[] stringArray = JSONUtils.readArray(json, String.class);
 // stringArray[0] returns "apple"
 // stringArray.length returns 3

 String numberJson = "[1, 2, 3]";
 Integer[] integerArray = JSONUtils.readArray(numberJson, Integer.class);
 // integerArray[0] returns 1
 // integerArray.length returns 3
        Type Parameters:
        E - the type of the elements in the array
        Parameters:
        json - the JSON array string to parse and convert
        componentType - the class of the component type of the array
        Returns:
        an array of the specified component type populated with data from the JSON array string
        Throws:
        java.lang.IllegalArgumentException - if the JSON string is invalid or cannot be parsed into a JSONArray
        See Also:
        JSONArray, readArray(JSONArray, Class)

      • readArray

        public static <E> E[] readArray​(JSONArray jsonArray,
                                java.lang.Class<E> componentType)
        Reads a JSONArray and converts it into an array of the specified component type.

        This method takes a JSONArray and maps its elements to a new array of the specified component type. It supports arrays of any type, including primitives and their wrapper classes.

        Example Usage

        
 JSONArray jsonArray = new JSONArray("[\"apple\", \"banana\", \"cherry\"]");
 String[] stringArray = JSONUtils.readArray(jsonArray, String.class);
 // stringArray[0] returns "apple"
 // stringArray.length returns 3

 JSONArray numberJsonArray = new JSONArray("[1, 2, 3]");
 Integer[] integerArray = JSONUtils.readArray(numberJsonArray, Integer.class);
 // integerArray[0] returns 1
 // integerArray.length returns 3
        Type Parameters:
        E - the type of the elements in the array
        Parameters:
        jsonArray - the JSONArray to parse and convert
        componentType - the class of the component type of the array
        Returns:
        an array of the specified component type populated with data from the JSONArray
        See Also:
        JSONArray, readArray(String, Class)

      • writeValueAsString

        @Nullable
public static java.lang.String writeValueAsString​(java.lang.Object object)
        Converts an object into its JSON string representation.

        This method takes an object, wraps it using JSONObject.wrap(Object), and then converts it to a JSON string if it is a JSONObject or JSONArray.

        Example Usage

        
 String jsonString = JSONUtils.writeValueAsString(Map.of("name", "John", "age", 30));
 // Result: {"name":"John","age":30}

 String arrayJson = JSONUtils.writeValueAsString(new String[]{"apple", "banana"});
 // Result: ["apple","banana"]
        Parameters:
        object - the object to be converted to a JSON string.
        Returns:
        a JSON string representation of the given object, or null if conversion is not possible.
        See Also:
        JSONObject.wrap(Object)

      • writeBeanAsString

        @Nonnull
public static java.lang.String writeBeanAsString​(java.lang.Object javaBean)
        Converts a JavaBean object into its JSON string representation.

        This method takes a JavaBean object, resolves its properties into a map, and then constructs a JSONObject from that map. The resulting JSON object is then converted to a string.

        Example Usage

        
 public class Person {
     private String name;
     private int age;

     // Getters and setters...
 }

 Person person = new Person();
 person.setName("John Doe");
 person.setAge(30);

 String jsonString = JSONUtils.writeJavaBeanAsString(person);
 // Result: {"name":"John Doe","age":30}
        Parameters:
        javaBean - the JavaBean object to be converted to a JSON string.
        Returns:
        a JSON string representation of the given JavaBean.
        Throws:
        java.lang.IllegalArgumentException - if the input object is null.

      • determineElementClass

        @Nonnull
public static java.lang.Class<?> determineElementClass​(JSONArray jsonArray)
        Determines the common class of elements in the given JSONArray.

        This method iterates through the elements of the provided JSONArray to find a common class. If all elements are of the same class or one class is assignable from all others, that class is returned. If no common class can be determined, Object.class is returned.

        Example Usage

        
 JSONArray array1 = new JSONArray("[\"apple\", \"banana\", \"cherry\"]");
 Class<?> commonClass1 = JSONUtils.determineElementClass(array1); // returns String.class

 JSONArray array2 = new JSONArray("[1, \"banana\", 3.14]");
 Class<?> commonClass2 = JSONUtils.determineElementClass(array2); // returns Object.class

 JSONArray array3 = new JSONArray("[1, 2, 3]");
 Class<?> commonClass3 = JSONUtils.determineElementClass(array3); // returns Integer.class
        Parameters:
        jsonArray - the JSONArray whose elements' common class is to be determined
        Returns:
        the common class of the elements, or Object.class if no common class can be determined