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How to create Json Array using Object Model?
This page shows how to create Json array using Object Model.
Note: Refer How to read Json data using JsonReader? page for dependent libraries.
Java example to create json array:
package com.javaapi.json.examples;
import java.io.StringWriter;
import javax.json.Json;
import javax.json.JsonArray;
import javax.json.JsonArrayBuilder;
import javax.json.JsonObject;
import javax.json.JsonObjectBuilder;
import javax.json.JsonWriter;
public class CreateJsonObjEx {
public static void main(String a[]){
JsonObjectBuilder jsonBuilder = Json.createObjectBuilder();
jsonBuilder.add("emp_name", "Nataraj G");
jsonBuilder.add("emp_id", 1016);
jsonBuilder.add("salary", 20000);
// create Json array with only values
JsonArrayBuilder plnArrBld = Json.createArrayBuilder();
plnArrBld.add("Rakesh");
plnArrBld.add("John");
JsonArray arr = plnArrBld.build();
// the array got created, add it to the json as a child element
jsonBuilder.add("direct_contacts", arr);
// create an array of key-value pairs
JsonArrayBuilder kvArrBld = Json.createArrayBuilder();
// create each key-value pair as seperate object and add it to the array
kvArrBld.add(Json.createObjectBuilder().add("email", "[email protected]").build());
kvArrBld.add(Json.createObjectBuilder().add("mobile", "123123123123").build());
JsonArray contactsArr = kvArrBld.build();
// add contacts array object
jsonBuilder.add("contacts", contactsArr);
JsonObject empObj = jsonBuilder.build();
// here we are writing to String writer.
// if you want you can write it to a file as well
StringWriter strWtr = new StringWriter();
JsonWriter jsonWtr = Json.createWriter(strWtr);
jsonWtr.writeObject(empObj);
jsonWtr.close();
System.out.println(strWtr.toString());
}
}
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Output: |
{
"emp_name": "Nataraj G",
"emp_id": 1016,
"salary": 20000,
"direct_contacts": [
"Rakesh",
"John"
],
"contacts": [
{
"email": "[email protected]"
},
{
"mobile": "123123123123"
}
]
}
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Java API for JSON processing examples
- How to read Json data using JsonReader?
- How to read Json array data using JsonArray?
- How to create Json Object using Object Model?
- How to create Json Array using Object Model?
- How to create Json Object using Streaming Model API?
- How to create Json Array using Streaming Model API?
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What is java static import?
By using static imports, we can import the static members from a class
rather than the classes from a given package. For example, Thread class has
static sleep method, below example gives an idea:
import static java.lang.Thread;
public class MyStaticImportTest {
public static void main(String[] a) {
try{
sleep(100);
} catch(Exception ex){
}
}
}
Never argue with a fool, onlookers may not be able to tell the difference.
-- Mark Twain
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