Read a list of json objects in java sample program

package com.belazy.json;

import java.io.File;
import java.io.IOException;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class ReadJSONList {
private ObjectMapper mapper = null;

private ObjectMapper getObjectMapper(){
if(null == mapper)
mapper = new ObjectMapper();
return mapper;
}

public static void main(String[] args) {
ReadJSONList bscPhysics = new ReadJSONList();
bscPhysics.read("D:\\PTXSANCHAYKA\\zgc_physics.json");
}

private void read(String fileName) {
JsonNode rootArray;
try {
rootArray = getObjectMapper()
.readTree(new File(fileName));
for (JsonNode root : rootArray) {
JsonNode name = root.path("name");
System.out.println("Name of the student  : " + name);
System.out.println(getObjectMapper().writeValueAsString(root));
}
} catch (JsonProcessingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}}
}

Output

Name of the student  : "Lijesh"
{"name":"Lijesh","age":29,"cars":["Ford","BMW","Fiat"]}
Name of the student  : "Biju vas"
{"name":"Biju vas","age":32,"cars":["Ford","BMW","Fiat"]}
Name of the student  : "Smithesh"
{"name":"Smithesh","age":33,"cars":["Ford","BMW","Fiat"]}
Name of the student  : "Madhav haridas"
{"name":"Madhav haridas","age":28,"cars":["Ford","BMW","Fiat"]}
Name of the student  : "Murali Krishnan"
{"name":"Murali Krishnan","age":28,"cars":["Ford","BMW","Fiat"]}
Name of the student  : "Ranjini Raj"
{"name":"Ranjini Raj","age":28,"cars":["Ford","BMW","Fiat"]}

zgc_physics.json

[{
"name":"Lijesh",
"age":29,
"cars":[ "Ford", "BMW", "Fiat" ]
},{
"name":"Biju vas",
"age":32,
"cars":[ "Ford", "BMW", "Fiat" ]
},{
"name":"Smithesh",
"age":33,
"cars":[ "Ford", "BMW", "Fiat" ]
},{
"name":"Madhav haridas",
"age":28,
"cars":[ "Ford", "BMW", "Fiat" ]
},{
"name":"Murali Krishnan",
"age":28,
"cars":[ "Ford", "BMW", "Fiat" ]
},{
"name":"Ranjini Raj",
"age":28,
"cars":[ "Ford", "BMW", "Fiat" ]
}]

Serializing POJO to JSON - Input parameterization

How to output a json like below using java program

{"id":"0001","name":"Cake","topping":[{"id":"5001","type":"None"},{"id":"5004","type":"Maple"}],"ppu":"0.55","type":"donut","batters":{"batter":[{"id":"1004","type":"Devil's Food"},{"id":"0001","type":"Regular"}]}}

Program

/**

 * 

 */

package com.belazy.pojostructure;

import com.fasterxml.jackson.core.JsonProcessingException;

import com.fasterxml.jackson.databind.ObjectMapper;

/**

 * @author consumerfed IT Section 

 * Kozhikode

 *

 */

public class ManiClass {

public static void main(String[] args) throws JsonProcessingException {

Javabelazy user = new Javabelazy();

user.setId("0001");

    user.setType("donut");

    user.setName("Cake");

    user.setPpu("0.55");

    Batter batter1 = new Batter();

    batter1.setId("0001");

    batter1.setType("Regular");

    Batter batter2 = new Batter();

    batter2.setId("1004");

    batter2.setType("Devil's Food");

    Batters batters = new Batters();

    Batter[] batter = new Batter[2];

    batter[1] = batter1;

    batter[0] = batter2;

batters.setBatter(batter );

    user.setBatters(batters); 

    Topping topping1 = new Topping();

    topping1.setId("5001");

    topping1.setType("None");

    Topping topping2 = new Topping();

    topping2.setId("5004");

    topping2.setType("Maple");

    Topping[] topping = new Topping[2];

    topping[0] = topping1;

    topping[1] = topping2;

user.setTopping(topping );

ObjectMapper objectmapper = new ObjectMapper();

    String json = objectmapper.writeValueAsString(user);

    System.out.println(json);

}

}

User class

package com.belazy.pojostructure;

public class Javabelazy

{

    private String id;

    private String name;

    private Topping[] topping;

    private String ppu;

    private String type;

    private Batters batters;

    public String getId ()

    {

        return id;

    }

    public void setId (String id)

    {

        this.id = id;

    }

    public String getName ()

    {

        return name;

    }

    public void setName (String name)

    {

        this.name = name;

    }

    public Topping[] getTopping ()

    {

        return topping;

    }

    public void setTopping (Topping[] topping)

    {

        this.topping = topping;

    }

    public String getPpu ()

    {

        return ppu;

    }

    public void setPpu (String ppu)

    {

        this.ppu = ppu;

    }

    public String getType ()

    {

        return type;

    }

    public void setType (String type)

    {

        this.type = type;

    }

    public Batters getBatters ()

    {

        return batters;

    }

    public void setBatters (Batters batters)

    {

        this.batters = batters;

    }

    @Override

    public String toString()

    {

        return "ClassPojo [id = "+id+", name = "+name+", topping = "+topping+", ppu = "+ppu+", type = "+type+", batters = "+batters+"]";

    }

}

Topping class

package com.belazy.pojostructure;

public class Topping

{

    private String id;

    private String type;

    public String getId ()

    {

        return id;

    }

    public void setId (String id)

    {

        this.id = id;

    }

    public String getType ()

    {

        return type;

    }

    public void setType (String type)

    {

        this.type = type;

    }

    @Override

    public String toString()

    {

        return "ClassPojo [id = "+id+", type = "+type+"]";

    }

}

Batters class

package com.belazy.pojostructure;

public class Batters

{

    private Batter[] batter;

    public Batter[] getBatter ()

    {

        return batter;

    }

    public void setBatter (Batter[] batter)

    {

        this.batter = batter;

    }

    @Override

    public String toString()

    {

        return "ClassPojo [batter = "+batter+"]";

    }

}

Batter class

package com.belazy.pojostructure;

public class Batter

{

    private String id;

    private String type;

    public String getId ()

    {

        return id;

    }

    public void setId (String id)

    {

        this.id = id;

    }

    public String getType ()

    {

        return type;

    }

    public void setType (String type)

    {

        this.type = type;

    }

    @Override

    public String toString()

    {

        return "ClassPojo [id = "+id+", type = "+type+"]";

    }

}

Output