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

Rest call to Java Json sample program

Getting JSON Response from Rest Call in java

Description

This is a rest service call in java. The rest service which returns josn as response is saved to Java Object through Object Mapper API. The Object Mapper is very simple to use


/**
 *  Json to Java using Object Mapper
 */
package com.belazy.rest;

import java.io.File;
import java.io.IOException;
import java.net.URL;

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

/**
 * @author itsection kozhikode
 *
 */
public class JsonMapper {

/**
* @param args
* @throws IOException
* @throws JsonMappingException
* @throws JsonGenerationException
*/
public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {
// TODO Auto-generated method stub

ObjectMapper objectMapper = new ObjectMapper();
Car car = new Car("bmw","blue");
File resultFile = new File("d://belazy.json");
objectMapper.writeValue(resultFile, car);

ComputerDetails comp = objectMapper.readValue(new URL("http://ip.jsontest.com"), ComputerDetails.class);
System.out.println(comp.getIp());

JsonKey jsonkey = objectMapper.readValue(new URL("http://echo.jsontest.com/key/value/one/two"), JsonKey.class);
System.out.println("jsonkey.getOne() : "+jsonkey.getOne());

}





}

computerdetails.class

/**
 *
 */
package com.belazy.rest;

/**
 * @author belazy
 *
 */
public class ComputerDetails {

String ip;

/**
* @return the ip
*/
public String getIp() {
return ip;
}

/**
* @param ip the ip to set
*/
public void setIp(String ip) {
this.ip = ip;
}


}

jsonkey.class


package com.belazy.rest;
public class JsonKey
{
    private String one;

    private String key;

    public String getOne ()
    {
        return one;
    }

    public void setOne (String one)
    {
        this.one = one;
    }

    public String getKey ()
    {
        return key;
    }

    public void setKey (String key)
    {
        this.key = key;
    }

    @Override
    public String toString()
    {
        return "ClassPojo [one = "+one+", key = "+key+"]";
    }
}

java api needed

jackson annotation jar
jackson core
jackson databind

Output

86.99.219.5
jsonkey.getOne()two

Popular post

https://stackoverflow.com/questions/19045992/getting-json-response-as-part-of-rest-call-in-java/47400673#47400673

How to deal with SSL Handshake exception

/**
 * Consuming a Rest application
 */
package com.belazy.rest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * @author belazy
 *
 * This program I dedicate to my Tech Arc
 * she wish be a data scientist
 * Hope she will achieve it in the nearest days.
 *
 */
public class RestConsumer {

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub

String theUrl = "https://jsonplaceholder.typicode.com/posts";

try {
URL url = new URL(theUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setRequestProperty("Accept", "application/json");

System.out.println(conn.getResponseCode());

} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}

/**

 * 

 */

package com.belazy.rest;

/**

 * @author belazy

 *

 */

public class Post {

private String userId;

private String id;

private String title;

private String body;

/**

* @return the userId

*/

public String getUserId() {

return userId;

}

/**

* @param userId the userId to set

*/

public void setUserId(String userId) {

this.userId = userId;

}

/**

* @return the id

*/

public String getId() {

return id;

}

/**

* @param id the id to set

*/

public void setId(String id) {

this.id = id;

}

/**

* @return the title

*/

public String getTitle() {

return title;

}

/**

* @param title the title to set

*/

public void setTitle(String title) {

this.title = title;

}

/**

* @return the body

*/

public String getBody() {

return body;

}

/**

* @param body the body to set

*/

public void setBody(String body) {

this.body = body;

}

}

Exception in thread "main" javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.recvAlert(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown Source)
at com.belazy.rest.RestConsumer.main(RestConsumer.java:38)