Thursday, 11 September 2014

JSON with gson Library

Maven Dependency:

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>1.7.1</version>
  </dependency>


Student Pojo:

package com.ram.gson.pojo;

import java.util.ArrayList;
import java.util.List;

public class Student {
   
    public String name;
    public String age;
    public List<String> list = new ArrayList<String>();
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public List<String> getList() {
        return list;
    }
    public void setList(List<String> list) {
        this.list = list;
    }   
}


Convert Java To JSON:

package com.ram.gson;

import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import com.google.gson.Gson;
import com.ram.jackson.pojo.Student;

public class JavaToJson {

    public static void main(String[] args) {

        Student student = new Student();
        student.setName("Ramakrishna");
        student.setAge("26");
        List<String> list = new ArrayList<String>();
        list.add("100");
        list.add("200");
        list.add("300");
        student.setList(list);
       
        Gson gson = new Gson();
   
        String json = gson.toJson(student);
   
        try {

            FileWriter writer = new FileWriter("/home/ramakrishna/delete/json/student.json");
            writer.write(json);
            writer.close();
   
        } catch (IOException e) {
            e.printStackTrace();
        }
   
        System.out.println(json);
      }
   
    }



Convert JSON To Java:

package com.ram.gson;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

import com.google.gson.Gson;
import com.ram.gson.pojo.Student;

public class JsonToJava {

    public static void main(String[] args) {
       
        Gson gson = new Gson();
       
        try {
   
            BufferedReader br = new BufferedReader(
                new FileReader("/home/ramakrishna/delete/json/student.json"));
   
            Student student = gson.fromJson(br, Student.class);
   
            System.out.println("Name:"+student.getName());
            System.out.println("Age:"+student.getAge());
            System.out.println("Values:"+student.getList());
   
        } catch (IOException e) {
            e.printStackTrace();
        }
       
      }

}




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