[Jackson] How to convert JSON string to YAML?

Problem
Assume I have a JSON string:

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{ "id": 1, "name": "Albert", "email": "albert@gmail.com", "phone": "0900123456", "address": { "streetAddress": "信義區信義路五段7號", "city": "台北市", "zipCode": "110" } }

I would like to convert JSON string to YAML:

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--- id: 1 name: "Albert" email: "albert@gmail.com" phone: "0900123456" address: streetAddress: "信義區信義路五段7號" city: "台北市" zipCode: "110"

How to do it?

How-To
Take advantage of libraries can fulfill this requirement.

Add the following dependencies in pom.xml

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<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.9.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.9.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.9.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.dataformat</groupId> <artifactId>jackson-dataformat-yaml</artifactId> <version>2.9.3</version> </dependency>

Here has sample code:

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package test.albert.jackson; import java.io.IOException; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.dataformat.yaml.YAMLMapper; import lombok.extern.slf4j.Slf4j; @Slf4j public class JacksonTest { public static void main(String[] args) throws IOException { Address address = Address.builder().zipCode("110").city("台北市").streetAddress("信義區信義路五段7號").build(); Employee albert = Employee.builder().id(1).name("Albert").email("albert@gmail.com").phone("0900123456") .address(address).build(); ObjectMapper mapper = new ObjectMapper(); // convert object to JSON String json = mapper.writeValueAsString(albert); log.debug(json); // convert JSON to YAML JsonNode jsonNode = mapper.readTree(json); String yaml = new YAMLMapper().writeValueAsString(jsonNode); log.debug("yaml = \n " + yaml); } }