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How to read yaml configuration in java

Mar 28, 2024 pm 05:27 PM
standard library

如何在 Java 中读取 YAML 配置?第三方库:SnakeYAML:功能丰富,支持自定义解析器。Jackson-YAML:Jackson 库的一部分,专用于 YAML 解析。Java 标准库:Yaml 类(Java 9 及更高版本):提供基本 YAML 解析功能。

How to read yaml configuration in java

如何使用 Java 读取 YAML 配置

YAML(YAML Ain't Markup Language)是一种广泛用于配置文件和数据格式的轻量级标记语言。在 Java 中,我们可以使用第三方库或 Java 标准库来解析和读取 YAML 配置文件。

第三方库:

  • SnakeYAML:一个功能丰富的 YAML 解析器,支持多种数据结构和自定义解析器。
  • Jackson-YAML:Jackson 库的一部分,专用于解析 YAML 内容。
  • YCSB:一种流行的基准工具,具有读取和写入 YAML 配置的能力。

Java 标准库:

Java 9 及更高版本中引入了 YAML 支持,允许使用 java.util 中的 Yaml 类解析 YAML 内容。

使用第三方库:

SnakeYAML:

import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.constructor.Constructor;

public class ReadYamlWithSnakeYAML {

    public static void main(String[] args) {
        String yamlConfig = "..."; // YAML 配置文件的内容

        // 构建 SnakeYAML 解析器,指定要解析的数据类型
        Constructor constructor = new Constructor(Config.class);
        Yaml yaml = new Yaml(constructor);

        // 解析 YAML 配置,返回指定类型的对象
        Config config = yaml.loadAs(yamlConfig, Config.class);

        // 使用解析后的配置对象
        System.out.println(config.getName());
    }
}
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Jackson-YAML:

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;

public class ReadYamlWithJacksonYAML {

    public static void main(String[] args) {
        String yamlConfig = "..."; // YAML 配置文件的内容

        // 构建 ObjectMapper,指定 YAML 工厂
        ObjectMapper mapper = new ObjectMapper(new YAMLFactory());

        // 解析 YAML 配置,返回指定类型的对象
        Config config = mapper.readValue(yamlConfig, Config.class);

        // 使用解析后的配置对象
        System.out.println(config.getName());
    }
}
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Java 标准库:

import java.io.IOException;
import java.util.Yaml;

public class ReadYamlWithJavaStandardLibrary {

    public static void main(String[] args) throws IOException {
        String yamlConfig = "..."; // YAML 配置文件的内容

        // 解析 YAML 配置,返回一个 Map
        Map<String, Object> configMap = Yaml.load(yamlConfig);

        // 从 Map 中获取特定配置值
        String name = (String) configMap.get("name");

        // 使用解析后的配置值
        System.out.println(name);
    }
}
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这些示例均展示了如何使用这些方法解析 YAML 配置文件并访问配置值。每种方法都有其优点和缺点,可根据具体需求进行选择。

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