Learn about the simple YAML framework technical principles in the Java class library
Simple YAML framework technical principle in the Java class library
YAML (Yaml Ain'T Markup Language) is a sequence format of a human readable data that is often used in configuration files and data exchange.In Java development, we can use the simple YAML framework in the Java class library to process and analyze the data of YAML format.This article will introduce the technical principles of the simple YAML framework, and provide some Java code example for reference.
The simple YAML framework is developed based on the Snakeyaml library. It provides an API that is easy to use to read and write data in YAML format.It realizes the conversion between YAML and Java objects by parsing data in YAML format into Java objects, or serializing the Java object to YAML format data.
The following is an example that demonstrates how to use a simple YAML framework to resolve the data of YAML format:
First of all, we need to introduce the dependence of a simple YAML framework:
// maven dependence
<dependency>
<groupId>com.github.stephenc</groupId>
<artifactId>simpleyaml</artifactId>
<version>1.17</version>
</dependency>
Then, we can use the following code example to analyze the data of yaml format:
import org.yaml.simple.Yaml;
import java.io.FileReader;
import java.util.Map;
public class YAMLParser {
public static void main(String[] args) {
try {
Yaml yaml = new Yaml();
FileReader reader = new FileReader("example.yaml");
// Analyze the data in YAML format as a MAP object
Map<String, Object> data = yaml.load(reader);
// Traversing MAP objects and printing key values pairs
for (Map.Entry<String, Object> entry : data.entrySet()) {
System.out.println(entry.getKey() + " : " + entry.getValue());
}
reader.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
In the above code, we use the load () method of the YAML class to analyze the data in YAML format into a MAP object, and then obtain the key value pairs in YAML by traversing the MAP object and print it.
Similarly, we can also use the simple YAML framework to sequence the Java object to the data of YAML format.The following is an example:
import org.yaml.simple.Yaml;
import java.io.FileWriter;
import java.util.HashMap;
import java.util.Map;
public class YAMLGenerator {
public static void main(String[] args) {
try {
Map<String, Object> data = new HashMap<>();
data.put("name", "John");
data.put("age", 30);
data.put("gender", "male");
Yaml yaml = new Yaml();
FileWriter writer = new FileWriter("example.yaml");
// Sequence the Java object to the data of the YAML format and write it into the file
yaml.dump(data, writer);
writer.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
In the above code, we created a MAP object that contains names, age and gender, and used the DUMP () method of YAML class to sequence of data in YAML format, and then write the data into a "Example.yamll"In the file.
In summary, the simple YAML framework provides a convenient way to process and analyze the data in YAML format.By analyzing YAML data as Java objects, or serializing the Java object to YAML data, we can easily use YAML as a configuration file or data exchange format in the Java application.I hope the example code provided in this article can help you better understand the technical principles of the simple YAML framework.
