springboot/cloud yml与properties的相互转换

在springboot和springcloud中，配置文件使用的是yml或者properties。然而在某些场景，需要统一，在程序运行过程中，正常情况下是修改配置文件不能热重启的，所以需要使用工具类自动将properties转换成yml或反之。在开发时，转换可以使用网站转换。

1.导入依赖

mavem

                <dependency>
			<groupId>com.fasterxml.jackson.dataformat</groupId>
			<artifactId>jackson-dataformat-yaml</artifactId>
			<version>2.9.4</version>
		</dependency>

		<dependency>
			<groupId>com.fasterxml.jackson.dataformat</groupId>
			<artifactId>jackson-dataformat-properties</artifactId>
			<version>2.9.4</version>
		</dependency>

gradle

compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-yaml', version: '2.9.4'

2.yml转化成properties

public static List<String> yml2Properties(String s) {
        final String DOT = ".";
        List<String> lines = new LinkedList<>();
        try {
            YAMLFactory yamlFactory = new YAMLFactory();
            YAMLParser parser = yamlFactory.createParser(s);
            String key = "";
            String value ;
            JsonToken token = parser.nextToken();
            while (token != null) {
                if (JsonToken.START_OBJECT.equals(token)) {
                    // "{" 表示字符串开头，不做解析
                } else if (JsonToken.FIELD_NAME.equals(token)) {
                    if (key.length() > 0) {
                        key = key + DOT;
                    }
                    key = key + parser.getCurrentName();
                    token = parser.nextToken();
                    if (JsonToken.START_OBJECT.equals(token)) {
                        continue;
                    }
                    value = parser.getText();
                    lines.add(key + "=" + value);
                    int dotOffset = key.lastIndexOf(DOT);
                    if (dotOffset > 0) {
                        key = key.substring(0, dotOffset);
                    }
                } else if (JsonToken.END_OBJECT.equals(token)) {
                    int dotOffset = key.lastIndexOf(DOT);
                    if (dotOffset > 0) {
                        key = key.substring(0, dotOffset);
                    } else {
                        key = "";
                        lines.add("");
                    }
                }
                token = parser.nextToken();
            }
            parser.close();
        return lines;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

2.properties转化yml

   public static void properties2Yaml(String s) {
        JsonParser parser = null;
        JavaPropsFactory factory = new JavaPropsFactory();
        try {
            parser = factory.createParser(
                   "");
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        try {
            YAMLFactory yamlFactory = new YAMLFactory();
            YAMLGenerator generator = yamlFactory.createGenerator(
                    new OutputStreamWriter(new FileOutputStream(s), Charset.forName(ENCODING)));

            JsonToken token = parser.nextToken();

            while (token != null) {
                if (JsonToken.START_OBJECT.equals(token)) {
                    generator.writeStartObject();
                } else if (JsonToken.FIELD_NAME.equals(token)) {
                    generator.writeFieldName(parser.getCurrentName());
                } else if (JsonToken.VALUE_STRING.equals(token)) {
                    generator.writeString(parser.getText());
                } else if (JsonToken.END_OBJECT.equals(token)) {
                    generator.writeEndObject();
                }
                token = parser.nextToken();
            }
            parser.close();
            generator.flush();
            generator.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }