读取yml，properties配置文件的的几种方式

1-@value

@Value("${keys}")
private String key;

这里需要注意的是

• 当前类要交给spring来管理
• @Value不会赋值给static修饰的变量。

因为Spring的@Value依赖注入是依赖set方法,而自动生成的set方法是普通的对象方法,你在普通的对象方法里,都是给实例变量赋值的,不是给静态变量赋值的,static修饰的变量,一般不生成set方法。若必须给static修饰的属性赋值可以参考以下方法

private static String url;   
// 记得去掉static 
@Value("${mysql.url}") 
public void setDriver(String url) {      
    JdbcUtils.url= url; 
}

但是该方案有个弊端，数组应该如何注入呢？

2-使用对象注入

auth: 
  clients: 
   	- id:1
      password: 123
    - id: 2
      password: 123

@Component
@ConfigurationProperties(prefix="auth")
public class IgnoreImageIdConfig {
	private List<Map<String,String>> clients =new ArrayList<Integer>();
 
}

利用配置Javabean的形式来获得值，值得注意的是，对象里面的引用名字（‘clients’）,必须和yml文件中的（‘clients’）一致，不然就会取不到数据，另外一点是，数组这个对象必须先new出来，如果没有对象的话也会取值失败的，（同理map形式也必须先将map对应的对象new出来）。

3-读取配置文件

 private static final String FILE_PATH = "classpath:main_data_sync.yml";

    static Map<String, String> result = null;

    private static Properties properties = null;

    private YmlUtil() {
    }

    /**
     * 读取yml的配置文件数据
     * @param filePath
     * @param keys
     * @return
     */
    public static Map<String, String> getYmlByFileName(String filePath, String... keys) {
        result = new HashMap<>(16);
        if (filePath == null) {
            filePath = FILE_PATH;
        }
        InputStream in = null;
        File file = null;
        try {
            file = ResourceUtils.getFile(filePath);
            in = new BufferedInputStream(new FileInputStream(file));
            Yaml props = new Yaml();
            Object obj = props.loadAs(in, Map.class);
            Map<String, Object> param = (Map<String, Object>) obj;
            for (Map.Entry<String, Object> entry : param.entrySet()) {
                String key = entry.getKey();
                Object val = entry.getValue();
                if (keys.length != 0 && !keys[0].equals(key)) {
                    continue;
                }
                if (val instanceof Map) {
                    forEachYaml(key, (Map<String, Object>) val, 1, keys);
                } else {
                    String value = val == null ? null : JSONObject.toJSONString(val);
                    result.put(key, value);
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        return result;
    }

    public static Map<String, String> forEachYaml(String keyStr, Map<String, Object> obj, int i, String... keys) {
        for (Map.Entry<String, Object> entry : obj.entrySet()) {
            String key = entry.getKey();
            Object val = entry.getValue();
            if (keys.length > i && !keys[i].equals(key)) {
                continue;
            }
            String strNew = "";
            if (StringUtils.isNotEmpty(keyStr)) {
                strNew = keyStr + "." + key;
            } else {
                strNew = key;
            }
            if (val instanceof Map) {
                forEachYaml(strNew, (Map<String, Object>) val, ++i, keys);
                i--;
            } else {
                String value = val == null ? null : JSONObject.toJSONString(val);
                result.put(strNew, value);
            }
        }
        return result;
    }



    /**
     * 获取Properties类型属性值
     * @param filePath classpath:文件名
     * @param key key值
     * @return
     * @throws IOException
     */
    public static String getProperties(String filePath,String key) throws IOException {
        if (properties == null) {
            Properties prop = new Properties();
            //InputStream in = Util.class.getClassLoader().getResourceAsStream("testUrl.properties");
            InputStream in = new BufferedInputStream(new FileInputStream(ResourceUtils.getFile(filePath)))  ;
            prop.load(in);
            properties = prop;
        }
        return properties.getProperty(key);
    }

    public static void main(String[] args) {
        /*Map<String, String> cId = getYmlByFileName("classpath:test.yml", "auth", "clients");

        //cId.get("")
        String json = cId.get("auth.clients");
        List<Map> maps = JSONObject.parseArray(json, Map.class);
        System.out.println(maps);*/
        try {
            String properties = getProperties("classpath:test.properties", "fileServerOperator.beanName");
            System.out.println(properties);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

auth:  #认证
  clients:
    - id: 1
      secretKey: ba2631ee44149bbe #密钥key
    - id: 2
      secretKey: ba2631ee44149bbe #密钥key