How to parse JSON string using streaming API in Java?

The streaming API consists of an important interface JsonParser , which includes parsing JSON in streaming mode and provides Forward, Read-onlyMethods to access JSON data. The Json class contains methods for creating parsers from input sources. We can use the static method createParser() of the Json class to parse JSON.

Grammar

public static JsonParser createParser(Reader reader)

Example

Chinese translation is:

Example

import java.io.*;
import javax.json.Json;
import javax.json.stream.JsonParser;
import javax.json.stream.JsonParser.Event;

public class JSONParseringTest {
   public static void main(String[] args) {
      String jsonString = "{\"name\":\"Adithya\",\"employeeId\":\"115\",\"age\":\"30\"}";
      JsonParser parser = Json.createParser(new StringReader(jsonString));
      while(parser.hasNext()) {
         Event event = parser.next();
         if(event == Event.KEY_NAME) {
            switch(parser.getString()) {
               case "name":
                  parser.next();
                  System.out.println("Name: " + parser.getString());
                  break;
               case "employeeId":
                  parser.next();
                  System.out.println("EmployeeId: " + parser.getString());
                  break;
               case "age":
                  parser.next();
                  System.out.println("Age: " + parser.getString());
                  break;
            }
         }
      }
   }  
}

Output

Name: Adithya
EmployeeId: 115
Age: 30

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