Java 如何阅读yaml中的列表？

我正在尝试从yaml文件读取输入，内容如下：

- !com.example.Contact
  name: Nathan Sweet
  age: 28
  address: pak
  phoneNumbers:
    - !com.example.Phone
      name: Home
      number: 1122
    - !com.example.Phone
      name: Work
      number: 3322
- !com.example.Contact
  name: Nathan Sw1eet
  age: 281
  address: pak1
  phoneNumbers:
    - !com.example.Phone
      name: Home1
      number: 11221
    - !com.example.Phone
      name: Work1
      number: 33211

我有以下定义：

import java.util.List;
import java.util.Map;

public class Contact 
{
    public String name;
    public int age;
    public String address;
    public List phoneNumbers;
}
public class Phone
{
    public String name;
    public String number;
}

---

能告诉我怎么读这些电话号码吗？你试过了吗？我不得不重写一下你的yaml

- !!com.example.Contact
  name: Nathan Sweet
  age: 28
  address: pak
  phoneNumbers:
    - !!com.example.Phone
      name: Home
      number: 1122
    - !!com.example.Phone
      name: Work
      number: 3322
- !!com.example.Contact
  name: Nathan Sw1eet
  age: 281
  address: pak1
  phoneNumbers:
    - !!com.example.Phone
      name: Home1
      number: 11221
    - !!com.example.Phone
      name: Work1
      number: 33211

爪哇

package com.example;

import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.Resource;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;

public class LoadContacts {
    private static String yamlLocation="classpath:contacts.yaml";

    public static void main(String[] args) throws IOException{
        Yaml yaml = new Yaml(new Constructor(Collection.class));
        InputStream in = null;
        Collection<Contact> contacts;
        try {
            in = new FileInputStream(new File(yamlLocation));
            contacts = (Collection<Contact>) yaml.load(in);
        } catch (IOException e) {
                final DefaultResourceLoader loader = new DefaultResourceLoader();
                final Resource resource = loader.getResource(yamlLocation);
                in = resource.getInputStream();
                contacts = (Collection<Contact>) yaml.load(in);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (Exception e) {
                    // no-op
                }
            }
        }
        for(Contact contact:contacts){
            System.out.println(contact.name + ":" + contact.address + ":" + contact.age );
        }
    }
}

package.com.example；
导入org.springframework.core.io.DefaultResourceLoader；
导入org.springframework.core.io.Resource；
导入org.yaml.snakeyaml.yaml；
导入org.yaml.snakeyaml.constructor.constructor；
导入java.io.File；
导入java.io.FileInputStream；
导入java.io.IOException；
导入java.io.InputStream；
导入java.util.Collection；
公共类装入联系人{
私有静态字符串yamlocation=“classpath:contacts.yaml”；
公共静态void main（字符串[]args）引发IOException{
Yaml Yaml=新的Yaml（新构造函数（Collection.class））；
InputStream in=null；
收集联系人；
试一试{
in=新文件输入流（新文件（yamlocation））；
触点=（收集）yaml.load（输入）；
}捕获（IOE异常）{
final DefaultResourceLoader=新的DefaultResourceLoader（）；
最终资源=loader.getResource（yamlocation）；
in=resource.getInputStream（）；
触点=（收集）yaml.load（输入）；
}最后{
if（in！=null）{
试一试{
in.close（）；
}捕获（例外e）{
//无操作
}
}
}
用于（联系人：联系人）{
System.out.println（contact.name+“：”+contact.address+“：”+contact.age）；
}
}
}

由于我看到这篇文章是为了阅读用户对象列表，下面是我使用

Jackson

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;

import java.io.File;
import java.io.IOException;
import java.util.List;

public class LoadContacts {

  private static String yamlLocation = "path_to/../contacts.yml";

  public static void main(String[] args) throws IOException {
    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

    try {
      List<Contact> contactList = mapper.readValue(new File(yamlLocation), new TypeReference<List<Contact>>(){});
      contactList.forEach(System.out::println);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

---

SnakeYAML不需要这些标签。

   public List<Phone> phoneNumbers;