Convert JSON to Java object

JSON : JavaScript Object Notation

JSON is a lightweight data interchange format.It is not dependent on any programming language.In JSON data is represented in the form of name and value pairs.It is easy to parse and generate the JSON.

For example: 

{

"studentId":1,

"studentName":"Akash",

"studentAge":17,

"subjects":[

"science",

"english",

"hindi"

]

}

 Convert JSON data to Java object using - Jackson 2

jars required:

• jackson-annotations-2.1.2
• jackson-core-2.6.3
• jackson-databind-2.2.3

Student.java

package com.javainstance;

import java.util.List;

/**

 * @author javainstance

 *

 */

public class Student {

private int studentId;

private String studentName;

private int studentAge;

private List<String> subjects;

public int getStudentId() {

return studentId;

}

public void setStudentId(int studentId) {

this.studentId = studentId;

}

public String getStudentName() {

return studentName;

}

public void setStudentName(String studentName) {

this.studentName = studentName;

}

public int getStudentAge() {

return studentAge;

}

public void setStudentAge(int studentAge) {

this.studentAge = studentAge;

}

public List<String> getSubjects() {

return subjects;

}

public void setSubjects(List<String> subjects) {

this.subjects = subjects;

}

@Override

public String toString() {

return "Student [studentId=" + studentId + ", studentName=" + studentName + ", studentAge=" + studentAge

+ ", subjects=" + subjects + "]";

}

}

student.json

{

"studentId":1,

"studentName":"Akash",

"studentAge":17,

"subjects":[

"science",

"english",

"hindi"

]

}

JsonToObject.java

package com.javainstance;

import java.io.File;

import java.io.IOException;

import com.fasterxml.jackson.databind.JsonMappingException;

import com.fasterxml.jackson.databind.ObjectMapper;

/**

 * @author javainstance

 *

 */

public class JsonToObject {

public static void main(String[] args) {

ObjectMapper objectMapper = new ObjectMapper();

File file = new File("D://Workspace1//JSON//src//student.json");

Student student = null;

try {

student = objectMapper.readValue(file, Student.class);

} catch (JsonMappingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println(student);

}

}

Output:

Student [studentId=1, studentName=Akash, studentAge=17, subjects=[science, english, hindi]]

Download Complete Code from Github

References:

http://www.json.org/

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