如何在 Java 中使用 Jackson 创建单行 Yaml 数组

Question

我想创建一个yaml文件，如下所示：

hello: World
value: 3
lists:['T1','T2']

我想出了以下代码：

public static void main(String[] args) throws IOException {

    Data data = new Data();
    data.setHello("World");
    data.setValue(3);
    data.setLists(Arrays.asList("T1","T2"));

    ObjectMapper objectMapper =
        new ObjectMapper(
            new YAMLFactory()
                .disable(YAMLGenerator.Feature.WRITE_DOC_START_MARKER)
                .enable(YAMLGenerator.Feature.MINIMIZE_QUOTES)
                );
    
    objectMapper.writeValue(new File("filename.yaml"), data);
  }

  @Data
  private static class Data {
    private String hello;
    private int value;
    private List<String> lists;
  }

但是这段代码返回的输出如下：

hello: World
value: 3
lists:
- T1
- T2

任何人都可以指导我如何使用 jackson 获取 Yaml 的单行数组格式吗？

Answer 1

我面临着同样的问题，终于能够实现我想要的 下面是可能有帮助的代码。

public static void main( String[] args )throws IOException
{
 // Sample map with list value
    Map<String, Object> data = new HashMap<>();
    data.put("hello", "World");
    data.put("value", 3);
    List<String> list = new ArrayList<>();
    list.add("T1");
    list.add("T2");
    data.put("lists", list);

    // Create YAML object
    Yaml yaml = new Yaml();

    // Serialize map to YAML
    String yamlString = yaml.dump(data);

    // Replace single quotes around list values
    yamlString = yamlString.replaceAll("'(\\[.*?\\])'", "$1");

    // Write YAML to file
    FileWriter writer = new FileWriter("output_test.yaml");
    writer.write(yamlString);
    writer.close();

    System.out.println("YAML conversion completed successfully!");
 }