在目前的项目中，yaml文件作为配置文件已是很常见，例如k8s中的 pod、deployment、service等等组件的创建可通过执行yaml文件创建。

废话不多说  先上代码：

import com.alibaba.fastjson.JSONObject;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.test.context.junit4.SpringRunner;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.Yaml;

import java.io.*;
import java.util.Map;

@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {

    @Test
    public void contextLoads() {

        Yaml yaml = new Yaml();
        Resource resource = new ClassPathResource("b.yaml"); //读取resources文件夹中的yaml文件
        Object result = null;
        InputStream in = null;
        try {
//            File file = resource.getFile();
            File dumpfile = new File("/Users/wyg/Desktop/b.yaml");
            in = new FileInputStream(dumpfile);
            result = yaml.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if (in != null){
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        Map<String,String> resmap = (Map<String, String>) result;
        System.out.println(JSONObject.toJSONString(resmap));

//        将数据写入yaml文件
        DumperOptions dumperOptions = new DumperOptions();
        dumperOptions.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
        Yaml wyaml = new Yaml(dumperOptions);
        File dumpfile = new File("/Users/wyg/Desktop/b.yaml");
        try(FileWriter writer = new FileWriter(dumpfile)) {
            wyaml.dump(resmap, writer);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}