
Let us take a look at how to read a JSON file and convert it into Java Object using Jackson library,
Java POJO: Album.javaimport java.util.Arrays;
public class Album {
private String artistName;
private String albumName;
private int releaseYear;
private String[] songsList;
public Album() {}
public Album(String artistName, String albumName, int releaseYear, String[] songsList) {
this.artistName = artistName;
this.albumName = albumName;
this.releaseYear = releaseYear;
this.songsList = 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;
}
@Override
public String toString() {
return "Album{" +
"artistName='" + artistName + '\'' +
", albumName='" + albumName + '\'' +
", releaseYear=" + releaseYear +
", songsList=" + Arrays.toString(songsList) +
'}';
}
}
JSON file: album.json
{
"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"
]
}
JsonFileToJavaObject.java
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
import java.io.IOException;
public class JsonFileToJavaObject {
public static void main(String[] args) {
try {
String jsonFileName = "album.json";
File jsonFile = new File(jsonFileName);
ObjectMapper objectMapper = new ObjectMapper();
//JSON File to Java Object
Album album = objectMapper.readValue(jsonFile, Album.class);
System.out.println(album.getAlbumName());
System.out.println(album.getArtistName());
System.out.println(album.getReleaseYear());
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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