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How to merge two JSON strings in an order using JsonParserSequence in Java?
The JsonParserSequence is a helper class that can be used to create a parser containing two sub-parsers placed in a particular sequence. We can create a sequence using the static method createFlattened() of the JsonParserSequence class.
Syntax
public static JsonParserSequence createFlattened(JsonParser first, JsonParser second)
Example
import java.io.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.util.*;
public class JsonParserSequenceTest {
public static void main(String[] args) throws JsonParseException, IOException {
String jsonString1 = "{\"id\":\"101\", \"name\":\"Ravi Chandra\", \"address\":\"Pune\"}";
String jsonString2 = "{\"id\":\"102\", \"name\":\"Raja Ramesh\", \"address\":\"Hyderabad\", \"contacts\":[{\"mobile\":\"9959984805\", \"home\":\"7702144400\"}]}";
JsonFactory jsonFactory = new JsonFactory();
JsonParser jsonParser1 = jsonFactory.createParser(jsonString1);
JsonParser jsonParser2 = jsonFactory.createParser(jsonString2);
JsonParserSequence jsonParserSequence = JsonParserSequence.createFlattened(jsonParser1, jsonParser2);
JsonToken jsonToken = jsonParserSequence.nextToken();
while(jsonToken != null) {
switch(jsonToken) {
case FIELD_NAME: System.out.println("Key field: " + jsonParserSequence.getText());
break;
case VALUE_FALSE:
case VALUE_NULL:
case VALUE_NUMBER_FLOAT:
case VALUE_NUMBER_INT:
case VALUE_STRING:
case VALUE_TRUE: System.out.println("Key value: " + jsonParserSequence.getText());
break;
}
jsonToken = jsonParserSequence.nextToken();
}
jsonParserSequence.close();
}
}Output
Key field: id Key value: 101 Key field: name Key value: Ravi Chandra Key field: address Key value: Pune Key field: id Key value: 102 Key field: name Key value: Raja Ramesh Key field: address Key value: Hyderabad Key field: contacts Key field: mobile Key value: 9959984805 Key field: home Key value: 7702144400
Updated on: 07-Jul-2020
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