springboot：JSON字符串转换为YAML

一、使用Jackson

添加依赖

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.6.5</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-yaml</artifactId>
    <version>2.6.5</version>
</dependency>

代码实现

//读取 JSON 字符串
JsonNode jsonNodeTree = new ObjectMapper().readTree(jsonStr);
//转换成 YAML 字符串
String yamlStr = new YAMLMapper().writeValueAsString(jsonNodeTree);

效果展示

---
apiVersion: "app.alauda.io/v1alpha1"
kind: "HelmRequest"
metadata:
  name: "mongodb-java-6666"
spec:
  chart: "bitnami/mongodb"
  namespace: "test-hl2"
  releaseName: "mongodb-java-6666"
  values:
    service:
      type: "NodePort"
    auth:
      rootUser: "admin"
      rootPassword: "admin123123"
  version: "11.0.4"

该方式会自动带上 --- 分隔符，大部分属性值也默认带上了双引号，若不想要引号，可使用下面的方式

二、使用 snakeyaml

添加依赖

<dependency>
    <groupId>org.yaml</groupId>
    <artifactId>snakeyaml</artifactId>
    <version>1.18</version>
</dependency>

代码实现

Yaml yaml = new Yaml();
//将 JSON 字符串转成 Map
Map<String,Object> map = (Map<String, Object>) yaml.load(jsonUrl);
//转换成 YAML 字符串
String yamlStr = yaml.dumpAsMap(map);

效果展示

kind: Service
apiVersion: v1
metadata:
  name: tomcat
  labels:
    app: tomcat
spec:
  ports:
  - name: tcp-8080
    protocol: TCP
    port: 8080
  selector:
    app: tomcat