Commons Json Utils

Utilities for serialize and deserialize from JSON using Jackson

Maven

Functionality of this package is contained in Java package com.fasterxml.jackson.databind, and can be used using following Maven dependency:

<dependencies>
  ...
  <dependency>
    <groupId>com.jarcasting</groupId>
    <artifactId>jarcasting-json-utils-jakarta</artifactId>
    <version>1.0.7</version>
  </dependency>
  ...
</dependencies>

Depends on:

• com.fasterxml.jackson.core : jackson-databind
• com.fasterxml.jackson.module : jackson-module-parameter-names
• com.fasterxml.jackson.datatype : jackson-datatype-jdk8
• com.fasterxml.jackson.datatype : jackson-datatype-jsr310
• com.fasterxml.jackson.datatype : jackson-datatype-jakarta-jsonp
• org.apache.commons : commons-lang3

Examples

JSON to POJO

• json to Custom Object

      class MyClass {
          int a;
          int b;
      }
  
  
      MyClass result = 
          JsonUtils.fromJson(
                 "{\"a\":1,\"b\":2}", 
                 MyClass.class
          );

• json to Enum

      enum MyEnum {
          A, B
      }
      enum MyEnum2 {
  
          A(87),
          B(89);
  
          int myField;
  
          MyEnum2(int myField) {
              this.myField=myField;
          }
  
      }
  
      public void jsonToEnum(){
          MyEnum result = JsonUtils.fromJson(
                  "\"A\"",
                  MyEnum.class
          );
          MyEnum2 result2 = JsonUtils.fromJson(
                  "\"B\"",
                  MyEnum2.class
          );
          Assert.assertEquals(JsonUtils.toJson2(result), "\"A\"");
          Assert.assertEquals(JsonUtils.toJson2(result2), "\"B\"");
      }

• json to Generic Object

      static class MyGenericClass<T> {
          T value;
      }
      
      public void jsonToGenericObject() throws Exception {
  
          MyGenericClass<MySimpleClass> result = JsonUtils.fromJson(
                  "{\"value\":{\"a\":1,\"b\":2}}",
                  new TypeReference<MyGenericClass<MySimpleClass>>() { }
          );
  
          Assert.assertEquals(JsonUtils.toJson2(result), "{\"value\":{\"a\":1,\"b\":2}}");
  
      }

• json to HashTable

      Hashtable<String, Integer> result =
              JsonUtils.fromJson("{\"a\":1,\"b\":2}",
                      new TypeReference<Hashtable<String, Integer>>(){}
              );

• convert json to Key Value Pairs

      // TODO

• json keyset

      Set<String> result = 
          JsonUtils.jsonKeySet("{\"a\":1,\"b\":2}");

• json keys

      String[] result = 
          JsonUtils.jsonKeys("{\"a\":1,\"b\":2}");

Override Object.toString()

    @Override
    public String toString() {
        return JsonUtils.toJson(this);
    }

License

Licensed under the Apache License Version 2.0

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