YAML
YAML 数据结构可以用类似大纲的缩排方式呈现,结构通过缩进来表示,连续的项目通过减号“-”来表示,map结构里面的key/value对用冒号“:”来分隔。
下面介绍两种 Java 读取 Yaml 内容的方式:文章来源:https://www.toymoban.com/news/detail-616414.html
1.SnakeYaml
忽略注释的方式,读写会导致注释丢失文章来源地址https://www.toymoban.com/news/detail-616414.html
- 在pom.xml加入snakeyaml依赖:
<!-- read and write yaml file -->
<dependency>
<groupId>org.yaml</groupId>
<artifactId>snakeyaml</artifactId>
<version>1.29</version>
</dependency>
- 具体java代码:
public class YamlUtils {
private static final Logger logger = LoggerFactory.getLogger(YamlUtils.class);
// yml2Map: Yaml to Map, 将yaml文件读为map
public static Map<String, Object> yml2Map(String path) throws FileNotFoundException {
FileInputStream fileInputStream = new FileInputStream(path);
Yaml yaml = new Yaml();
Map<String, Object> ret = (Map<String, Object>) yaml.load(fileInputStream);
return ret;
}
// map2Yml: Map to Yaml, 将map转换为yaml格式
public static void map2Yml(Map<String, Object> map, String path) throws IOException {
File file = new File(path);
FileWriter fileWriter = new FileWriter(file);
DumperOptions options = new DumperOptions();
options.setDefaultFlowStyle(DumperOptions.FlowStyle.BLOCK);
Yaml yaml = new Yaml(options);
yaml.dump(map, fileWriter);
}
}
2.eo-yaml:
- 支持注释读写的yaml包;
- 读取的时候,生成节点,在每一个节点上保存相应的注释;
- 写入的时候,根据节点,重新添加相应的注释;
<dependency>
<groupId>com.amihaiemil.web</groupId>
<artifactId>eo-yaml</artifactId>
<version>4.3.5</version>
</dependency>
YamlMapping team = Yaml.createYamlInput(
new File(path)
).readYamlMapping();
String architect = team.string("architect");
YamlSequence devs = team.yamlSequence("developers");
YamlSequence devops = team.yamlSequence("devops");
Map<String, Integer> grades = new HashMap<>();
grades.put("Math", 9);
grades.put("CS", 10);
YamlMapping student = Yaml.createYamlDump(
new Student ("John", "Doe", 20, grades)
).dumpMapping();
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