Detailed explanation of the simple YAML framework technical principles and applications in the Java class library
Simple YAML framework technical principles and applications in the Java class library
Overview
Yaml (Yaml Ain'T Markup Language) is a human friendly data serialization format.It represents data in text formats that is easy to read, and can be parsed and generated by many programming languages.In the Java class library, there are many simple YAML frameworks that can be used to analyze and generate data in YAML formats.This article will introduce the technical principles and applications of these simple YAML frameworks, and provide the corresponding Java code example.
Technical principle
The simple YAML framework in the Java class library mainly analyzes and generate YAML data through the following steps:
1. Load YAML data: YAML data can be loaded from different sources such as files, string or input streams.The YAML framework usually provides the corresponding API method to read the data of these sources.
2. Analysis of YAML data: Once the YAML data is loaded, the framework will analyze it and convert it to the representation of the Java object.The analysis process mainly involves the combination of the transformation of YAML's hierarchical structure into a corresponding Java object.
3. Generate YAML data: In addition to parsing YAML data, the YAML framework can also convert the Java object to the corresponding YAML data.The process of generating YAML data is opposite, and the hierarchical structure of the Java object is about to be converted into the hierarchical structure of YAML.
4. Check YAML data: Some YAML frameworks also provide verification functions to verify whether YAML data meets specific constraints or specifications.
Applications
Below is an example of using a simple YAML framework in the Java library to analyze and generate the analysis and generation of YAML data:
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
import java.io.IOException;
public class YAMLExample {
public static void main(String[] args) throws IOException {
// Analyze yaml data
String yamlData = "name: John Doe
age: 30";
ObjectMapper objectMapper = new ObjectMapper(new YAMLFactory());
Person person = objectMapper.readValue(yamlData, Person.class);
System.out.println (Person.getName ()); // Output "John Doe"
System.out.println (Person.getage ()); // Output 30 30
// Generate YAML data
Person person2 = new Person("Jane Smith", 25);
String yamlData2 = objectMapper.writeValueAsString(person2);
System.out.println (yamldata2); // Output "name: jane smith
age: 25"
}
static class Person {
private String name;
private int age;
public Person() {
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
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;
}
}
}
In the above example, we use Jackson's YAML processing library to resolve and generate YAML data.Through the ObjectMapper class, we can easily convert YAML data to Java objects (analysis) or Java objects into YAML data (generated).
Summarize
The simple YAML framework is widely used in the Java library in parsing and generating data to generate YAML formats.They provide a convenient operating interface through the process of loading, parsing, and generating YAML data.Through the introduction and example of this article, it is believed that readers have a better understanding of the technical principles and applications of the simple YAML framework.Please select the suitable YAML framework according to the actual needs and use it according to the API document provided by the framework.
