import org.junit.Test;
import org.yaml.snakeyaml.Yaml;

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

import com.alibaba.fastjson.JSON;

public class testload {
    @Test
    public void load() throws FileNotFoundException{
        //初始化Yaml解析器
        Yaml yaml = new Yaml();
        File f=new File("/Users/wangzulong/mycode/yamtest/src/main/resources/testload.yaml");
        //读入文件
        Object result= yaml.load(new FileInputStream(f));
        System.out.println(result.getClass());
        System.out.println( result);
    }

    @Test
    public void loadMap() throws IOException {
        Yaml yaml = new Yaml();
        Map<String, Object> map = null;
        InputStream is = new FileInputStream(new File("/Users/wangzulong/mycode/yamtest/src/main/resources/testload.yaml"));
        if (is != null) {
            map = (Map<String, Object>) yaml.load(is);
            is.close();
        }
        System.out.println(map);
    }

    @Test
    public void loadObjects() throws IOException {
        Yaml yaml = new Yaml();
        List<Object> list = null;
        InputStream is = new FileInputStream(new File("src/test/resources/example.yaml"));
        if (is != null) {
            list = new ArrayList<Object>();
            for (Object obj : yaml.loadAll(is)) {
                list.add(obj);
            }
            is.close();
        }

        System.out.println(list);
        String json= JSON.toJSONString(list, true);
        System.out.println(json);

        FileWriter fw = null;
        fw = new FileWriter("src/test/resources/topology.json");
        BufferedWriter output = new BufferedWriter(fw);
        output.write(json);
        output.close();
    }
}

private void generateHelloworld() throws IOException{
        MethodSpec main = MethodSpec.methodBuilder("main")
        //main代表方法名
                .addModifiers(Modifier.PUBLIC,Modifier.STATIC)
                    //Modifier 修饰的关键字
                .addParameter(String[].class, "args")
                //添加string[]类型的名为args的参数
                .addStatement("$T.out.println($S)", System.class,"Hello World")
                    //添加代码，这里$T和$S后面会讲，这里其实就是添加了System,out.println("Hello World");
                .build();
                TypeSpec typeSpec = TypeSpec.classBuilder("HelloWorld")
                //HelloWorld是类名
                .addModifiers(Modifier.FINAL,Modifier.PUBLIC)
                .addMethod(main)  
                //在类中添加方法
                .build();
        JavaFile javaFile = JavaFile.builder("com.example.helloworld", typeSpec)
                .build();
        javaFile.writeTo(System.out);
    }

作者：尸情化异
链接：https://www.jianshu.com/p/95f12f72f69a
來源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

package com.example.helloworld;

public final class HelloWorld {
  public static void main(String[] args) {
    System.out.println("Hello, JavaPoet!");
  }
}