JSON read write

• App.java
• pom.xml

App.java

package com.training.rs;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

public class App {

    private static final String MY_ARRAY = "my_array";
    private static final String ELEMENT2 = "element2";
    private static final String ELEMENT1 = "element1";
    private static final String TEST_FILE = "/tmp/json.txt";

    public static void main(String[] args) throws IOException, ParseException {
        App app = new App();
        app.writeJSONtoFile();
        app.readJSONFromFile();
    }

    @SuppressWarnings("unchecked")
    private void writeJSONtoFile() throws IOException {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put(ELEMENT1, "value1");
        jsonObject.put(ELEMENT2, 1234);

        JSONArray jsonArray = new JSONArray();
        jsonArray.add("list el1");
        jsonArray.add("list el2");

        jsonObject.put(MY_ARRAY, jsonArray);

        FileWriter file = new FileWriter(TEST_FILE);
        file.write(jsonObject.toJSONString());
        file.flush();
        file.close();

        System.out.print(jsonObject);
    }

    @SuppressWarnings("unchecked")
    private void readJSONFromFile() throws FileNotFoundException, IOException,
            ParseException {
        JSONParser parser = new JSONParser();

        Object obj = parser.parse(new FileReader(TEST_FILE));

        JSONObject jsonObject = (JSONObject) obj;

        String name = (String) jsonObject.get(ELEMENT1);
        System.out.println(name);

        long age = (Long) jsonObject.get(ELEMENT2);
        System.out.println(age);

        JSONArray msg = (JSONArray) jsonObject.get(MY_ARRAY);

        Iterator<String> iterator = msg.iterator();
        while (iterator.hasNext()) {
            System.out.println(iterator.next());
        }
    }

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.training</groupId>
    <artifactId>json_read_write</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>com.googlecode.json-simple</groupId>
            <artifactId>json-simple</artifactId>
            <version>1.1.1</version>
        </dependency>
    </dependencies>

</project>