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BAEL-6370: Introduce @JsonKey annotation for Map serialization (#13766) 

Co-authored-by: Tapan Avasthi <tavasthi@Tapans-MacBook-Air.local>
This commit is contained in:
Tapan Avasthi 2023-04-07 05:23:50 +05:30 committed by GitHub
parent e7ccb7a4c0
commit 3051d4ba97
3 changed files with 74 additions and 0 deletions
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5
jackson-modules/jackson-conversions/pom.xml
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@ -24,6 +24,11 @@
<artifactId>jackson-datatype-jsr310</artifactId>
<version>${jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
</dependencies>
<build>

21
jackson-modules/jackson-conversions/src/main/java/com/baeldung/jackson/map/Fruit.java Normal file
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@ -0,0 +1,21 @@
package com.baeldung.jackson.map;
import com.fasterxml.jackson.annotation.JsonKey;
import com.fasterxml.jackson.annotation.JsonValue;
public class Fruit {
public String variety;
@JsonKey
public String name;
public Fruit(String variety, String name) {
this.variety = variety;
this.name = name;
}
@JsonValue
public String getFullName() {
return this.variety + " " + this.name;
}
}

48
jackson-modules/jackson-conversions/src/test/java/com/baeldung/jackson/map/MapWithJsonKeyValueUnitTest.java Normal file
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@ -0,0 +1,48 @@
package com.baeldung.jackson.map;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import org.junit.jupiter.api.Assertions;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class MapWithJsonKeyValueUnitTest {
private static final Fruit FRUIT1 = new Fruit("Alphonso", "Mango");
private static final Fruit FRUIT2 = new Fruit("Black", "Grapes");
private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
@Test
public void givenObject_WhenSerialize_ThenUseJsonValueForSerialization() throws JsonProcessingException {
String serializedValueForFruit1 = OBJECT_MAPPER.writeValueAsString(FRUIT1);
Assertions.assertEquals("\"Alphonso Mango\"", serializedValueForFruit1);
String serializedValueForFruit2 = OBJECT_MAPPER.writeValueAsString(FRUIT2);
Assertions.assertEquals("\"Black Grapes\"", serializedValueForFruit2);
}
@Test
public void givenMapWithObjectKeys_WhenSerialize_ThenUseJsonKeyForSerialization() throws JsonProcessingException {
// Given
Map<Fruit, String> selectionByFruit = new HashMap<>();
selectionByFruit.put(FRUIT1, "Hagrid");
selectionByFruit.put(FRUIT2, "Hercules");
// When
String serializedValue = OBJECT_MAPPER.writeValueAsString(selectionByFruit);
// Then
Assertions.assertEquals("{\"Mango\":\"Hagrid\",\"Grapes\":\"Hercules\"}", serializedValue);
}
@Test
public void givenMapWithObjectValues_WhenSerialize_ThenUseJsonValueForSerialization() throws JsonProcessingException {
// Given
Map<String, Fruit> selectionByPerson = new HashMap<>();
selectionByPerson.put("Hagrid", FRUIT1);
selectionByPerson.put("Hercules", FRUIT2);
// When
String serializedValue = OBJECT_MAPPER.writeValueAsString(selectionByPerson);
// Then
Assertions.assertEquals("{\"Hagrid\":\"Alphonso Mango\",\"Hercules\":\"Black Grapes\"}", serializedValue);
}
}