Skip to content

Instantly share code, notes, and snippets.

@webfirmframework

webfirmframework/JsonParserUsage.java

Last active November 1, 2025 09:45
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save webfirmframework/824d3408c4beb4845cd32f5b43ff5eee to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save webfirmframework/824d3408c4beb4845cd32f5b43ff5eee to your computer and use it in GitHub Desktop.
Download ZIP
JSON parsing/building examples
Raw
JsonParserUsage.java
import com.webfirmframework.wffweb.json.*;
import java.time.LocalDate;
public class JsonParserUsage {
private static void jsonObjectParsingExample1() {
//To parse JSON object
JsonMap jsonMap = JsonMap.parse("""
{"key1" : "value1"}
""");
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
}
private static void jsonObjectParsingExample2() {
//To parse JSON object
JsonConcurrentMap jsonMap = JsonConcurrentMap.parse("""
{"key1" : "value1"}
""");
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
}
private static void jsonObjectParsingExample3() {
//To parse JSON object
JsonLinkedMap jsonMap = JsonLinkedMap.parse("""
{"key1" : "value1"}
""");
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
}
private static void jsonObjectParsingByJsonParserExample1() {
JsonParser jsonParser = JsonParser.newBuilder()
.jsonObjectType(JsonObjectType.JSON_MAP)
.jsonArrayType(JsonArrayType.JSON_LIST).build();
//To parse JSON object
JsonMap jsonMap = jsonParser.parseJsonObject("""
{"key1" : "value1"}
""") instanceof JsonMap parsedJsonMap ? parsedJsonMap : null;
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
}
private static void jsonObjectParsingByJsonParserExample2() {
JsonParser jsonParser = JsonParser.newBuilder()
.jsonObjectType(JsonObjectType.JSON_CONCURRENT_MAP)
.jsonArrayType(JsonArrayType.JSON_LIST).build();
//To parse JSON object
JsonConcurrentMap jsonMap = jsonParser.parseJsonObject("""
{"key1" : "value1"}
""") instanceof JsonConcurrentMap parsedJsonMap ? parsedJsonMap : null;
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
}
private static void jsonObjectParsingByJsonParserExample3() {
JsonParser jsonParser = JsonParser.newBuilder()
.jsonObjectType(JsonObjectType.JSON_LINKED_MAP)
.jsonArrayType(JsonArrayType.JSON_LIST).build();
//To parse JSON object
JsonLinkedMap jsonMap = jsonParser.parseJsonObject("""
{"key1" : "value1"}
""") instanceof JsonLinkedMap parsedJsonMap ? parsedJsonMap : null;
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
}
private static void jsonArrayParsingExample1() {
//To parse JSON text
JsonList jsonList = JsonList.parse("""
["item1", "item2", "item3"]
""");
//To add value
jsonList.add("item4");
//To build JSON string
String jsonString = jsonList.toJsonString();
System.out.println("jsonString = " + jsonString);
//To get value from 1st index
String valueFromIndex1 = jsonList.getValueAsString(1);
System.out.println("valueFromIndex1 = " + valueFromIndex1);
JsonListNode jsonListNode = jsonList;
JsonBaseNode jsonBaseNode = jsonListNode;
}
private static void jsonArrayParsingExample2() {
//To parse JSON text
JsonLinkedList jsonList = JsonLinkedList.parse("""
["item1", "item2", "item3"]
""");
//To add value
jsonList.add("item4");
//To build JSON string
String jsonString = jsonList.toJsonString();
System.out.println("jsonString = " + jsonString);
//To get value from 1st index
String valueFromIndex1 = jsonList.getValueAsString(1);
System.out.println("valueFromIndex1 = " + valueFromIndex1);
JsonListNode jsonListNode = jsonList;
JsonBaseNode jsonBaseNode = jsonListNode;
}
private static void jsonArrayParsingByJsonParserExample1() {
JsonParser jsonParser = JsonParser.newBuilder()
.jsonObjectType(JsonObjectType.JSON_MAP)
.jsonArrayType(JsonArrayType.JSON_LIST).build();
//To parse JSON text
JsonList jsonList = jsonParser.parseJsonArray("""
["item1", "item2", "item3"]
""") instanceof JsonList parsedJsonList ? parsedJsonList : null;
//To add value
jsonList.add("item4");
//To build JSON string
String jsonString = jsonList.toJsonString();
System.out.println("jsonString = " + jsonString);
//To get value from 1st index
String valueFromIndex1 = jsonList.getValueAsString(1);
System.out.println("valueFromIndex1 = " + valueFromIndex1);
JsonListNode jsonListNode = jsonList;
JsonBaseNode jsonBaseNode = jsonListNode;
}
private static void jsonArrayParsingByJsonParserExample2() {
JsonParser jsonParser = JsonParser.newBuilder()
.jsonObjectType(JsonObjectType.JSON_MAP)
.jsonArrayType(JsonArrayType.JSON_LINKED_LIST).build();
//To parse JSON text
JsonLinkedList jsonList = jsonParser.parseJsonArray("""
["item1", "item2", "item3"]
""") instanceof JsonLinkedList parsedJsonList ? parsedJsonList : null;
//To add value
jsonList.add("item4");
//To build JSON string
String jsonString = jsonList.toJsonString();
System.out.println("jsonString = " + jsonString);
//To get value from 1st index
String valueFromIndex1 = jsonList.getValueAsString(1);
System.out.println("valueFromIndex1 = " + valueFromIndex1);
JsonListNode jsonListNode = jsonList;
JsonBaseNode jsonBaseNode = jsonListNode;
}
private static void jsonParsingWithCustomJsonMapAndCustomJsonArrayExample() {
//You can implement more methods to extend the functionality of exiting JsonMap, JsonList etc.. as follows
class CustomJsonMap extends JsonMap {
public LocalDate put(final String key, final LocalDate localDate) {
final JsonList dateParts = new JsonList(3);
dateParts.add(localDate.getYear());
dateParts.add(localDate.getMonthValue());
dateParts.add(localDate.getDayOfMonth());
return super.put(key, dateParts) instanceof JsonList existingDateParts ? LocalDate.of(existingDateParts.getValueAsInteger(0), existingDateParts.getValueAsInteger(1), existingDateParts.getValueAsInteger(2)) : null;
}
public LocalDate getValueAsLocalDate(final String key) {
final JsonListNode dateParts = super.getValueAsJsonListNode(key);
return dateParts != null ?
LocalDate.of(
dateParts.getValueAsInteger(0),
dateParts.getValueAsInteger(1),
dateParts.getValueAsInteger(2))
: null;
}
}
class CustomJsonList extends JsonList {
public boolean add(final LocalDate localDate) {
final JsonList dateParts = new JsonList(3);
dateParts.add(localDate.getYear());
dateParts.add(localDate.getMonthValue());
dateParts.add(localDate.getDayOfMonth());
return super.add(dateParts);
}
public LocalDate getValueAsLocalDate(final int index) {
final JsonListNode dateParts = super.getValueAsJsonListNode(index);
return LocalDate.of(
dateParts.getValueAsInteger(0),
dateParts.getValueAsInteger(1),
dateParts.getValueAsInteger(2));
}
}
//CUSTOM_JSON_MAP and CUSTOM_JSON_LIST are new, it is available since 12.0.6.
JsonParser jsonParser = JsonParser.newBuilder()
.jsonObjectType(JsonObjectType.CUSTOM_JSON_MAP).jsonMapFactory(CustomJsonMap::new)
.jsonArrayType(JsonArrayType.CUSTOM_JSON_LIST).jsonListFactory(CustomJsonList::new).build();
//To parse JSON object
CustomJsonMap jsonMap = jsonParser.parseJsonObject("""
{"key1" : "value1",
"valuesArray": ["one", "two", "three"]
}
""") instanceof CustomJsonMap customJsonMap ? customJsonMap : null;
//To build JSON string
String jsonString = jsonMap.toJsonString();
System.out.println("jsonString = " + jsonString);
//To put key-value
jsonMap.put("key2", "value2");
jsonMap.put("dateOfBirth", LocalDate.of(2014, 1, 14));
CustomJsonList arrayOfDates = new CustomJsonList();
arrayOfDates.add(LocalDate.of(2015, 2, 15));
arrayOfDates.add(LocalDate.of(2016, 3, 16));
arrayOfDates.add(LocalDate.of(2017, 4, 17));
jsonMap.put("arrayOfDates", arrayOfDates);
//To build JSON string quickly using parallel stream, useful only if the JsonMapNode is very huge.
jsonString = jsonMap.toBigJsonString();
System.out.println("jsonString = " + jsonString);
jsonMap = jsonParser.parseJsonObject(jsonString) instanceof CustomJsonMap customJsonMap ? customJsonMap : null;
//To get value by key
String valueForKey1 = jsonMap.getValueAsString("key1");
System.out.println("valueForKey1 = " + valueForKey1);
//To get value as LocalDate by custom method
LocalDate dateOfBirth = jsonMap.getValueAsLocalDate("dateOfBirth");
System.out.println("dateOfBirth = " + dateOfBirth);
JsonMapNode jsonMapNode = jsonMap;
JsonBaseNode jsonBaseNode = jsonMapNode;
//To get valuesArray
CustomJsonList jsonList = jsonMap.getValueAsJsonListNode("valuesArray") instanceof CustomJsonList customJsonList ? customJsonList : null;
//To add value
jsonList.add("item4");
//To build JSON string
jsonString = jsonList.toJsonString();
System.out.println("jsonString = " + jsonString);
//To get value from 1st index
String valueFromIndex1 = jsonList.getValueAsString(1);
System.out.println("valueFromIndex1 = " + valueFromIndex1);
JsonListNode jsonListNode = jsonList;
jsonBaseNode = jsonListNode;
arrayOfDates = jsonMap.getValueAsJsonListNode("arrayOfDates") instanceof CustomJsonList customJsonList ? customJsonList : null;
LocalDate dateFromIndex0 = arrayOfDates.getValueAsLocalDate(0);
System.out.println("dateFromIndex0 = " + dateFromIndex0);
LocalDate dateFromIndex1 = arrayOfDates.getValueAsLocalDate(1);
System.out.println("dateFromIndex1 = " + dateFromIndex1);
LocalDate dateFromIndex2 = arrayOfDates.getValueAsLocalDate(2);
System.out.println("dateFromIndex2 = " + dateFromIndex2);
}
public static void main(String[] args) {
jsonObjectParsingExample1();
jsonObjectParsingExample2();
jsonObjectParsingExample3();
jsonObjectParsingByJsonParserExample1();
jsonObjectParsingByJsonParserExample2();
jsonObjectParsingByJsonParserExample3();
jsonArrayParsingExample1();
jsonArrayParsingExample2();
jsonArrayParsingByJsonParserExample1();
jsonArrayParsingByJsonParserExample2();
jsonParsingWithCustomJsonMapAndCustomJsonArrayExample();
}
}
Raw
JsonParserUsageConsoleOutput.txt
jsonString = {"key1":"value1"}
jsonString = {"key1":"value1","key2":"value2"}
valueForKey1 = value1
jsonString = {"key1":"value1"}
jsonString = {"key1":"value1","key2":"value2"}
valueForKey1 = value1
jsonString = {"key1":"value1"}
jsonString = {"key1":"value1","key2":"value2"}
valueForKey1 = value1
jsonString = {"key1":"value1"}
jsonString = {"key1":"value1","key2":"value2"}
valueForKey1 = value1
jsonString = {"key1":"value1"}
jsonString = {"key1":"value1","key2":"value2"}
valueForKey1 = value1
jsonString = {"key1":"value1"}
jsonString = {"key1":"value1","key2":"value2"}
valueForKey1 = value1
jsonString = ["item1","item2","item3","item4"]
valueFromIndex1 = item2
jsonString = ["item1","item2","item3","item4"]
valueFromIndex1 = item2
jsonString = ["item1","item2","item3","item4"]
valueFromIndex1 = item2
jsonString = ["item1","item2","item3","item4"]
valueFromIndex1 = item2
jsonString = {"key1":"value1","valuesArray":["one","two","three"]}
jsonString = {"key1":"value1","key2":"value2","valuesArray":["one","two","three"],"dateOfBirth":[2014,1,14],"arrayOfDates":[[2015,2,15],[2016,3,16],[2017,4,17]]}
valueForKey1 = value1
dateOfBirth = 2014-01-14
jsonString = ["one","two","three","item4"]
valueFromIndex1 = two
dateFromIndex0 = 2015-02-15
dateFromIndex1 = 2016-03-16
dateFromIndex2 = 2017-04-17
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment