Circe YAML framework Introduction: Data serialization tools in the Java class library
Circe is a data serialization tool in a Java library. It uses YAML (Yet Another Markup Language) format to process data.YAML is a readable language serialized language that can be readable, which can easily represent the data as a hierarchical structure, and it is easy to understand and edit.
Circe provides a simple and flexible way to convert the Java object and YAML format.It allows developers to use annotations to specify the mapping relationship of the field and method of the Java object, and automatically complete the serialization and deepening process of the object.By using Circe, developers can directly convert the Java object to YAML format without manual analysis and stitching data.This greatly simplifies the process of processing the complex data structure and improves the readability and maintenance of the code.
Below is a simple Java code example, demonstrating how to use Circe to convert Java objects into YAML formats:
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
import com.fasterxml.jackson.dataformat.yaml.YAMLGenerator;
import com.fasterxml.jackson.dataformat.yaml.YAMLMapper;
import java.io.File;
import java.io.IOException;
public class CirceExample {
public static void main(String[] args) {
// Create a Java object
Person Person = New Person ("Zhang San", 28);
// Create a yaml ObjectMapper
ObjectMapper mapper = new YAMLMapper();
try {
// Convert Java objects to a string in YAML format
String yaml = mapper.writeValueAsString(person);
System.out.println(yaml);
// Write the yaml string into the file
mapper.writeValue(new File("person.yaml"), person);
// Read and convert from YAML files to Java objects
Person readPerson = mapper.readValue(new File("person.yaml"), Person.class);
System.out.println(readPerson);
} catch (IOException e) {
e.printStackTrace();
}
}
// Define the Java object of an example
public static class Person {
private String name;
private int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
// There must be a default constructor function
public Person() {
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
}
In the above example, we first created a `Person` class as an example Java object.Then, we use the YamlMapper provided by Jackson to process the conversion between the object and the yaml format.We use the method to convert Java objects into YAML string, and use the `` writevalue () method to write yaml into the file with the `` 我们) method.Then, we read and convert it from the YAML file and convert it to the Java object from the YAML file.Finally, we printed the transformed YAML string and the Java object obtained.
In short, Circe is a convenient and easy -to -use Java class library that can easily handle the conversion between the Java object and the yaml format.It provides an annotation driver to convert the Java object to a YAML string or convert the YAML string into a Java object simple and flexible.Whether it is processing configuration files, storage data, or interacting with other systems, Circe can help developers to improve development efficiency and provide more readable and maintainable code.
