Java解析yaml

test.yaml文件内容：

ip: '192.168.102.31'
port: '7788'
spring:
    application:
        name: cruncher
server:
    port2: 9000
monitor_nic: 
    nic: {name: 'ethA', slot: 0, cpu: 0}

直接上代码：

import java.io.File;
import java.io.FileInputStream;
import java.util.Iterator;
import java.util.Map;

import org.yaml.snakeyaml.Yaml;

/**  
 * @author huiqiang
 * @time 2017-12-1 11:48:00
 */  
public class a {
	@SuppressWarnings({ "rawtypes", "unchecked" })
	public static void main(String[] args) throws Exception {
//	try {
		Yaml yaml = new Yaml();
		File dumpFile = new File("D:\\test.yaml");
		//获取test.yaml文件中的配置数据，然后转换为obj，
		Object load =yaml.load(new FileInputStream(dumpFile));

		/**Springboot中可以这样读resources目录下的文件
		InputStream io = Thread.currentThread().getContextClassLoader().getResourceAsStream("application.yml");
		Object load =yaml.load(io);*/

		System.out.println(yaml.dump(load));
		System.out.println("#############################################################################");
		//也可以将值转换为Map
		Map<String, String> map =(Map<String, String>)yaml.load(new FileInputStream(dumpFile));
		System.out.println(map);
		System.out.println("#############################################################################");
		        
		/**
		for (String key : map.keySet()) {
			System.out.println("key= "+ key + "; value= " + map.get(key));
		}
		上面这个遍历方法适用于Map（key, value）形式的，而这个里有链表形式的就会报错java.util.LinkedHashMap cannot be cast to java.lang.String
		*/
		Iterator iter = map.entrySet().iterator(); 
		while (iter.hasNext()) {
			Map.Entry entry = (Map.Entry) iter.next(); 
			String key = (String) entry.getKey();
			Object val = entry.getValue();
			
			if(key.equals("ip") | key.equals("port")){
				System.out.println("------map------");
				String string = (String)val;	//因为val是7788形式的所以可以强转成String，而下面的val是{port=9000}则无法强转成String
				System.out.println("ket:value "+key+":"+string);
			}else{
				System.out.println("------LinkedHashMap------");
				System.out.println("ket:value "+key+":"+val);
				if(key.equals("server")){
					Map<String, Integer> map1 = (Map<String, Integer>) val;
					for (String key1 : map1.keySet()) {
						//将LinkedHashMap的value再构建一个Map从而能取到最里面的值
						System.out.println("key= "+ key1 + "; value= " + map1.get(key1));
					}
				}
			}
		} 
//	} catch (Exception e) {
//		e.printStackTrace();
//	}
	}
}

运行结果：

ip: 192.168.102.31
port: '7788'
spring:
  application: {name: cruncher}
server: {port2: 9000}
monitor_nic:
  nic: {name: ethA, slot: 0, cpu: 0}

#############################################################################
{ip=192.168.102.31, port=7788, spring={application={name=cruncher}}, server={port=9000}, monitor_nic={nic={name=ethA, slot=0, cpu=0}}}
#############################################################################
------map------
ket:value ip:192.168.102.31
------map------
ket:value port:7788
------LinkedHashMap------
ket:value spring:{application={name=cruncher}}
------LinkedHashMap------
ket:value server:{port=9000}
key= port2; value= 9000
------LinkedHashMap------
ket:value monitor_nic:{nic={name=ethA, slot=0, cpu=0}}

Maven依赖：

        <dependency>
            <groupId>org.yaml</groupId>
            <artifactId>snakeyaml</artifactId>
            <version>1.26</version>
        </dependency>