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Merged
maibin merged 2 commits into from
May 20, 2023
Merged

Convert Hashmap to JSON object in Java #14070

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Convert Hashmap to JSON object in Java
BahaaHelmy May 20, 2023
8cd2e36
Convert Hashmap to JSON object in Java
BahaaHelmy May 20, 2023
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34 changes: 34 additions & 0 deletions core-java-modules/core-java-collections-maps-6/pom.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -16,5 +16,39 @@
<properties>
<spring.version>5.2.5.RELEASE</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.1</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>1.36</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.9</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20230227</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>

</project>
65 changes: 65 additions & 0 deletions .../core-java-collections-maps-6/src/test/java/com/baeldung/maptojson/MapToJsonUnitTest.java
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@@ -0,0 +1,65 @@
package com.baeldung.maptojson;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonSyntaxException;
import com.google.gson.TypeAdapter;
import com.google.gson.reflect.TypeToken;
import org.json.JSONObject;
import org.junit.Test;
import org.junit.jupiter.api.Assertions;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

public class MapToJsonUnitTest {
final TypeAdapter<JsonElement> strictAdapter = new Gson().getAdapter(JsonElement.class);

public boolean isValid(String json) {
try {
strictAdapter.fromJson(json);
} catch (JsonSyntaxException | IOException e) {
return false;
}
return true;
}

@Test
public void given_HashMapData_whenUsingJackson_thenConvertToJson() throws JsonProcessingException {
Map<String, String> data = new HashMap();
data.put("CS", "Post1");
data.put("Linux", "Post1");
data.put("Kotlin", "Post1");
ObjectMapper objectMapper = new ObjectMapper();
String jacksonData = objectMapper.writeValueAsString(data);
Assertions.assertTrue(isValid(jacksonData));
}

@Test
public void given_HashMapData_whenUsingGson_thenConvertToJson() {
Map<String, String> data = new HashMap<>();
data.put("CS", "Post1");
data.put("Linux", "Post1");
data.put("Kotlin", "Post1");
Gson gson = new Gson();
Type typeObject = new TypeToken<HashMap>() {
}.getType();
String gsonData = gson.toJson(data, typeObject);
Assertions.assertTrue(isValid(gsonData));
}

@Test
public void given_HashMapData_whenOrgJson_thenConvertToJsonUsing() {
Map<String, String> data = new HashMap<>();
data.put("CS", "Post1");
data.put("Linux", "Post1");
data.put("Kotlin", "Post1");
JSONObject jsonObject = new JSONObject(data);
String orgJsonData = jsonObject.toString();
Assertions.assertTrue(isValid(orgJsonData));
}
}