Java Yml格式转换为Properties

问题引入

使用在线的yml转换properties, 发现有属性内容漏了，网站地址https://tooltt.com/yaml2properties/。
于是自己动手写个转换工具类，自测过多个 yml 文件，目前没发现遗漏的。

需要转换的yaml文件如下

spring:
  application:
    name: xtoon-sys-server
  cloud:
    nacos:
      config:
        server-addr: localhost:8848
        file-extension: yaml
        enabled: true
  boot:
    admin:
      client:
        url: http://localhost:5001
        username: admin
        password: admin
        instance:
          prefer-ip: true

management:
  health:
    redis:
      enabled: false
  endpoint:
    health:
      show-details: always
  endpoints:
    web:
      exposure:
        include: "*"

在线转换网站转换的结果

spring.application.name=xtoon-sys-server
spring.cloud.nacos.config.server-addr=localhost:8848
spring.cloud.nacos.config.file-extension=yaml
spring.boot.admin.client.url=http://localhost:5001
spring.boot.admin.client.username=admin
spring.boot.admin.client.password=admin
management.endpoint.health.show-details=always
management.endpoints.web.exposure.include=*

正确的转换结果应该如下

spring.application.name=xtoon-sys-server
spring.cloud.nacos.config.server-addr=localhost:8848
spring.cloud.nacos.config.file-extension=yaml
spring.cloud.nacos.config.enabled=true
spring.boot.admin.client.url=http://localhost:5001
spring.boot.admin.client.username=admin
spring.boot.admin.client.password=admin
spring.boot.admin.client.instance.prefer-ip=true
management.health.redis.enabled=false
management.endpoint.health.show-details=always
management.endpoints.web.exposure.include=*

在线网站转换结果截图如下

对比原始文本和转换结果，发现少了几个属性

spring.cloud.nacos.config.enabled=true
spring.boot.admin.client.instance.prefer-ip=true
management.health.redis.enabled=false

这几个结果有些特征，value值是boolean类型的。不知道还有没有其它类型的数据会有遗漏的？

转换代码

导入yaml读取jar

<dependency>
      <groupId>org.yaml</groupId>
      <artifactId>snakeyaml</artifactId>
      <version>1.33</version>
 </dependency>

Java 代码

package com.scd.tool;

import org.yaml.snakeyaml.Yaml;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Set;

/**
 * @author James
 */
public class YamlToProperties {

    public static void main(String[] args) {
        Yaml yaml = new Yaml();
        String filePath = "file/yaml/bootstrap.yml";
        try (InputStream inputStream = new FileInputStream(filePath)) {
            Object object = yaml.load(inputStream);
            List<String> resultList = travelRootWithResult(object);
            System.out.println(resultList);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private static List<String> travelRootWithResult(Object object) {
        List<String> resultList = new ArrayList<>();
        if (object instanceof LinkedHashMap) {
            LinkedHashMap map = (LinkedHashMap) object;
            Set<Object> keySet = map.keySet();
            for (Object key : keySet) {
                List<String> keyList = new ArrayList<>();
                keyList.add((String) key);
                travelTreeNode(map.get(key), keyList, resultList);
            }
        }
        return resultList;
    }
    

    private static void travelTreeNode(Object obj, List<String> keyList, List<String> resultList) {
        if (obj instanceof LinkedHashMap) {
            LinkedHashMap linkedHashMap = (LinkedHashMap) obj;
            linkedHashMap.forEach((key, value) -> {
                if (value instanceof LinkedHashMap) {
                    keyList.add((String) key);
                    travelTreeNode(value, keyList, resultList);
                    keyList.remove(keyList.size() - 1);
                } else {
                    StringBuilder result = new StringBuilder();
                    for (String strKey : keyList) {
                        result.append(strKey).append(".");
                    }
                    result.append(key).append("=").append(value);
                    System.out.println(result);
                    resultList.add(result.toString());
                }
            });
        } else {
            StringBuilder result = new StringBuilder();
            result.append(keyList.get(0)).append("=").append(obj);
            System.out.println(result);
            resultList.add(result.toString());
        }
    }
}

运行结果如下，对比之后发现没有出现遗漏的

spring.application.name=xtoon-sys-server
spring.cloud.nacos.config.server-addr=localhost:8848
spring.cloud.nacos.config.file-extension=yaml
spring.cloud.nacos.config.enabled=true
spring.boot.admin.client.url=http://localhost:5001
spring.boot.admin.client.username=admin
spring.boot.admin.client.password=admin
spring.boot.admin.client.instance.prefer-ip=true
management.health.redis.enabled=false
management.endpoint.health.show-details=always
management.endpoints.web.exposure.include=*

大家使用的时候只需要改一下filePath

代码解读

可以把yml 看成多个树，问题就转换成了遍历树的问题，我们需要获取树的路径以及子节点。树的路径是properties的key, 叶子节点是properties的value