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How to read Json array data using JsonArray?


This page shows how to read Json array data using JsonArray object.

Note: Refer How to read Json data using JsonReader? page for dependent libraries.

Here is the input json file:

Json Input File:
{
    "emp_id": 1017,
    "emp_name": "Nagesh Y",
    "emp_designation": "Manager",
    "department": "Java2Novice",
    "salary": 30000,
    "direct_reports": [
        "Nataraj G",
        "Kalyan",
        "Mahitha"
    ],
    "address": {
        "street":"MG Road",
        "city":"Bangalore"
    }
}

Java example to read json array data:

package com.javaapi.json.examples;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonValue;

public class ReadJsonArrayEx {

	public static void main(String a[]){
		
		File jsonInputFile = new File("/Users/java2novice/jsonInput.txt");
		InputStream is;
		try {
			is = new FileInputStream(jsonInputFile);
			// Create JsonReader from Json.
			JsonReader reader = Json.createReader(is);
			// Get the JsonObject structure from JsonReader.
			JsonObject empObj = reader.readObject();
			reader.close();
			// read string data
	        System.out.println("Emp Name: " + empObj.getString("emp_name"));
	        // read json array
	        JsonArray arrObj = empObj.getJsonArray("direct_reports");
	        System.out.println("\nDirect Reports:");
	        for(JsonValue value : arrObj){
	        	System.out.println(value.toString());
	        }
	        
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

Output:
Emp Name: Nagesh Y

Direct Reports:
"Nataraj G"
"Kalyan"
"Mahitha"
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Java API for JSON processing examples

  1. How to read Json data using JsonReader?
  2. How to read Json array data using JsonArray?
  3. How to create Json Object using Object Model?
  4. How to create Json Array using Object Model?
  5. How to create Json Object using Streaming Model API?
  6. How to create Json Array using Streaming Model API?
Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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