In this article, we will discuss how to convert JSON file to YAML file using ObjectMapper
1. Required libraries :
1.1 Maven Co-ordinates :
<dependency>
<groupId>com.fasterxml.jackson.dataformat</groupId>
<artifactId>jackson-dataformat-yaml</artifactId>
<version>2.13.4</version>
</dependency>
1.2 JAR files to download :
Download below jar files and include them in Project classpath –
- jackson-dataformat-yaml-2.13.4.jar
- jackson-annotations-2.13.4.jar
- jackson-core-2.13.4.jar
- jackson-databind-2.13.4.jar
- snakeyaml-1.13.jar
1.3 Project class-path :
2. JSON to YAML file conversion :
In the below illustration, we will convert JSON to YAML file,
- 1st step is to read the contents of the JSON file to a String
- 2nd step is to convert String into JSON node using readTree() method of ObjectMapper class by passing JSON contents in String format
- 3rd step is to convert JsonNode into YAML file using writeValueAsString() method of YamlMapper class by passing JsonNode as input–argument
JSON file contents – Person.json :
{
"title" : "Mr.",
"firstName" : "Sam",
"lastName" : "Anton",
"address" : {
"flatNumber" : "BV-1025",
"buildingName" : "Shivaji",
"plotNumber" : "1093",
"sector" : "Sector 19",
"city" : "Bengaluru",
"state" : "Karnataka",
"country" : "India",
"nodeName" : "South Bengaluru"
},
"items" : [ {
"itemName" : "Television",
"itemBoughtYear" : "2014"
}, {
"itemName" : "Washing Machine",
"itemBoughtYear" : "2020"
}, {
"itemName" : "Refrigerator",
"itemBoughtYear" : "2011"
}, {
"itemName" : "Grinder",
"itemBoughtYear" : "2012"
}, {
"itemName" : "Computer",
"itemBoughtYear" : "2010"
} ]
}
JsonToYamlConversion.java
package in.bench.resources.yaml.conversion;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;
public class JsonToYamlConversion {
public static void main(String[] args) {
try {
// 1st step - read JSON contents
String jsonContent = new String(Files.readAllBytes(Paths.get(
"C:\\Users\\Demo\\eclipse-workspace\\YamlConversion\\Person.json")));
// 2nd step - parse JSON contents
JsonNode jsonNodeTree = new ObjectMapper().readTree(jsonContent);
// 3rd step - convert JSON to YAML
String jsonAsYaml = new YAMLMapper().writeValueAsString(jsonNodeTree);
// print to console
System.out.println(jsonAsYaml);
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (JsonProcessingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Output in console :
---
title: "Mr."
firstName: "Sam"
lastName: "Anton"
address:
flatNumber: "BV-1025"
buildingName: "Shivaji"
plotNumber: "1093"
sector: "Sector 19"
city: "Bengaluru"
state: "Karnataka"
country: "India"
nodeName: "South Bengaluru"
items:
- itemName: "Television"
itemBoughtYear: "2014"
- itemName: "Washing Machine"
itemBoughtYear: "2020"
- itemName: "Refrigerator"
itemBoughtYear: "2011"
- itemName: "Grinder"
itemBoughtYear: "2012"
- itemName: "Computer"
itemBoughtYear: "2010"
In one of the previous article, already discussed YAML file to JSON conversion in detail
Related Articles :
- Gson – Java Object to JSON conversion
- Jackson – Java Object to JSON conversion
- Java – How to convert an Object to YAML using ObjectMapper ?
- Java – How to convert YAML to an Object using ObjectMapper ?
- Java – How to convert YAML to JSON using ObjectMapper ?
- Java – How to convert JSON to YAML using ObjectMapper ?
- Java – How to convert XML to JSON using ObjectMapper ?
- Java – How to convert JSON to XML using ObjectMapper ?
- Java – How to convert XML to YAML using ObjectMapper ?
- Java – How to convert YAML to XML using ObjectMapper ?
- Java – How to pretty-print JSON using ObjectMapper ?
- Java – How to convert XML to JSON using JSONObject ?
- Java – How to convert JSON to XML using JSONObject ?
- Java – How to pretty-print JSON using JSONObject ?
References :
- https://www.json.org/json-en.html
- https://yaml.org/
- https://fasterxml.github.io/jackson-databind/javadoc/2.7/com/fasterxml/jackson/databind/ObjectMapper.html
Happy Coding !!
Happy Learning !!