Convert JSON to XML in Java

JSON is a very light weighted data interchange format that stores data in a key-value pair. In this section, we understand how we can convert JSON data to XML or XML data to JSON.

Many times, we can come across a situation where we need to convert JSON to XML or vice versa. By using the org.json.XML class, we can easily convert JSON objects into XML data or XML data into JSON data. The org.json.XML class provides methods that help us in the conversion of different formats.

The XML.toString() method of the org.json.XML class plays an important role in converting JSON objects into an XML string.

The syntax of the toString() method of the org.json.XML is as follows:

 public static java.lang.String toString(java.lang.Object object) throws JSONException

Let's take examples of both of them and understand how the toString() method works in the conversion of different data interchange formats.

ConvertJsonToXml.java

// import required classes and packages
package javaTpoint.JavaExample;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.XML;

//create ConvertJsonToXML class to convert JSON data into XML
public class ConvertJsonToXML {
	
	// main() method start
	public static void main(String[] args) throws JSONException {
	   
	   // create variable loc that store location of the Sample.json file 
		String loc = "C:\\Users\\rastogi ji\\OneDrive\\Desktop\\Sample.json";
			
		String result;
		try {
				
			// read byte data from the Sample.json file and convert it into String
			result = new String(Files.readAllBytes(Paths.get(loc)));
			//Convert JSON to XML
			String xml = convertToXML(result, "root"); // This method converts json object to xml string
			
			// use try-catch to store XML data into file.
			FileWriter file = new FileWriter("C:\\Users\\rastogi ji\\OneDrive\\Desktop\\XMLData.txt");
	        	
				// use write() method of File to write XML data into XMLData.txt
	        	file.write(xml); 
	            file.flush();
	            System.out.println("Your XML data is successfully written into XMLData.txt");
	            
	            // close FileWriter
	            file.close();
	            
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	
	// create convertToXML() method for converting JSOn data into XML
	public static String convertToXML(String jsonString, String root) throws JSONException {	// handle JSONException
		
		// create instance of JSONObject by passing jsonString to the constructor
		JSONObject jsonObject = new JSONObject(jsonString);
		
		// use XML.toString() method to convert JSON into XML and store the result into a string
		String xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-15\"?>\n<"+root+">" + XML.toString(jsonObject) + "</"+root+">";
		
		// pass the XML data to the main() method
		return xml;
	}
}

Output:

ConvertXmlToJson.java

//import required classes and packages
package javaTpoint.JavaExample;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import org.json.JSONException;
import org.json.JSONObject;
import org.json.XML;

//create ConvertJsonToXML class to convert JSON data into XML
public class ConvertXmlToJson {
	// main() method start
	public static void main(String[] args) throws JSONException {
		// use try-catch block for conversion of data-interchange format
		try {
			//Convert XML to JSON by using convertToJSON() method
			String jsonString = convertToJSON("<Designation>Sr. Salesforce Developer</Designation><Address>AMERICA</Address><Mobile>89346724</Mobile><Pet>Dog</Pet><Name>Donal</Name>");
			// use try-catch to store JSON data into file.
			FileWriter file = new FileWriter("C:\\Users\\rastogi ji\\OneDrive\\Desktop\\XMLData.txt");
			// use write() method of File to write JSON data into Sample.json
	        file.write(jsonString); 
	        file.flush();
	        System.out.println("Your JSON data is successfully written into Sample.json"); 
	        // close FileWriter
	        file.close(); 
		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
	}
	// create convertToXML() method for converting JSOn data into XML
	public static String convertToJSON(String xmlString) {	
		JSONObject obj;
		String jsonString = "";
		try {
			// use XML.toJSONObject() method to convert XML data into JSON and store result into a variable of type JSONObject
			obj = XML.toJSONObject(xmlString);
			// get JSON string from JSON object and store it into a variable of type string
			jsonString = obj.toString();
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		// pass the JSON data to the main() method
		return jsonString;
	}
}

Output: