Java 中的 yaml 生成

Question

我是 Java 新手，在生成 yaml 时遇到问题。我想通过 java 生成一个 yaml 文件，如下所示，我为此使用了 Snake yaml。mart:  details:    name: Koushik    purpose: yaml generation for testing    owner:      - name: Bobby        email: [e-mail]      - name: Chaminda        email: [e-mail]尝试了类似下面的内容，但没有按照我期望的方式实现 yaml。public class yamlGeneration {   public static String get_details() {     String name = "Koushik";     String purpose = "yaml generation for testing";     String notification_name_1 = "Bobby";     String notification_email_1 = "[e-mail]";     String notification_name_2 = "Chaminda";     String notification_email_2 = "[e-mail]";     Map<String, Object> notification = new LinkedHashMap<>();     List<Map<String, Object>> owner = new ArrayList<Map<String, Object>>();     notification.put("name",notification_name_1);     notification.put("email",notification_email_1);     owner.add(notification);     notification.put("name",notification_name_2);     notification.put("email",notification_email_2);     owner.add(notification);     Map<String, Object> details = new LinkedHashMap<>();     details.put("name",name);     details.put("purpose",purpose);     details.put("owner",owner);     Map<String, Object> mart = new LinkedHashMap<>();     mart.put("details",details);     Yaml yaml = new Yaml();     return yaml.dump(mart).toString();}public static void main(String args[]){     String str = get_details();     System.out.println(str);  }}

Answer 1

为了获得正确的样式，您需要创建并配置一个DumperOptions对象并将其传递给类的构造函数Yaml。

public static void main(String[] args) {

    Map<String, Object> root = new LinkedHashMap<>();

    Map<String, Object> mart = new LinkedHashMap<>();

    Map<String, Object> details = new LinkedHashMap<>();

    details.put("name", "Koushik");

    details.put("purpose", "yaml generation for testing");

    details.put("owner", Arrays.asList(

            Map.of("name", "Bobby", "email", "[e-mail]"),

            Map.of("name", "Chaminda", "email", "[e-mail]")

    ));

    mart.put("details", details);

    root.put("mart", mart);

    DumperOptions options = new DumperOptions();

    options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);

    Yaml yaml = new Yaml(options);

    System.out.println(yaml.dump(root));

}

输出：

mart:

  details:

    name: Koushik

    purpose: yaml generation for testing

    owner:

    - name: Bobby

      email: [e-mail]

    - name: Chaminda

      email: [e-mail]

另外，您可以创建Representers和Resolvers，以便可以使用自定义类而不是嵌套的Map。