In order to convert a Java to JSON object using Jackon, we first need to add the Jackson library to the project dependencies,
Adding Jackson dependency to Java Gradle Project
Jackson Gradle Dependency:
implementation group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.13.4'
Jackson Maven Dependency:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.4</version>
</dependency>
Java Code Example using Jackson ObjectMapper:
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
public class Main {
public static void main(String[] args) {
Album album = new Album();
album.setArtistName("Michael Jackson");
album.setAlbumName("Thriller");
String[] songs = new String[9];
songs[0] = "Wanna Be Startin Somethin";
songs[1] = "Baby Be Mine";
songs[2] = "The Girl Is Mine";
songs[3] = "Thriller";
songs[4] = "Beat it";
songs[5] = "Billie Jean";
songs[6] = "Human Nature";
songs[7] = "P.Y.T. (Pretty Young Thing)";
songs[8] = "The Lady in My Life";
album.setSongsList(songs);
album.setReleaseYear(1982);
try {
ObjectMapper objectMapper = new ObjectMapper();
String jsonString = objectMapper.writeValueAsString(album);
System.out.println(jsonString);
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Album.java (POJO)
public class Album {
private String artistName;
private String albumName;
private int releaseYear;
private String[] songsList;
public String getArtistName() {
return artistName;
}
public void setArtistName(String artistName) {
this.artistName = artistName;
}
public String getAlbumName() {
return albumName;
}
public void setAlbumName(String albumName) {
this.albumName = albumName;
}
public int getReleaseYear() {
return releaseYear;
}
public void setReleaseYear(int releaseYear) {
this.releaseYear = releaseYear;
}
public String[] getSongsList() {
return songsList;
}
public void setSongsList(String[] songsList) {
this.songsList = songsList;
}
}
Json Output:
{
"artistName":"Michael Jackson",
"albumName":"Thriller",
"releaseYear":1982,
"songsList":[
"Wanna Be Startin Somethin",
"Baby Be Mine",
"The Girl Is Mine",
"Thriller",
"Beat it",
"Billie Jean",
"Human Nature",
"P.Y.T. (Pretty Young Thing)",
"The Lady in My Life"
]
}
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Author Info:
Rakesh (He/Him) has over 14+ years of experience in Web and Application development. He is the author of insightful How-To articles for Code2care.
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