Application cases of the JSON conversion framework in the Java library
Application cases of the JSON conversion framework in the Java library
Overview:
JSON (JavaScript Object Notation) is a lightweight data exchange format, which is widely used in front -end data interaction.In the field of Java, there are multiple JSON conversion frameworks for developers, which can help developers conversion between Java objects and JSON data.This article will introduce some commonly used JSON conversion frameworks in the Java class library, and provide the corresponding Java code example.
1. Gson：
GSON is a Java JSON library developed by Google. It provides a simple way to convert Java objects into JSON and convert JSON back to Java objects.The following is an example code that uses GSON for the conversion between objects and JSON:
import com.google.gson.Gson;
public class GsonExample {
public static void main(String[] args) {
// Create GSON objects
Gson gson = new Gson();
// java object converted to json
MyClass obj = new MyClass("John", 25);
String json = gson.toJson(obj);
System.out.println(json);
// json converted to Java object
MyClass obj2 = gson.fromJson(json, MyClass.class);
System.out.println(obj2.getName());
System.out.println(obj2.getAge());
}
}
// Example of Java class
class MyClass {
private String name;
private int age;
public MyClass(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
2. Jackson：
Jackson is another popular Java JSON library. It has high performance and flexibility and supports a variety of JSON processing scenarios.The following is an example code that uses Jackson for the conversion between objects and JSON:
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
public class JacksonExample {
public static void main(String[] args) throws IOException {
// Create ObjectMapper objects
ObjectMapper mapper = new ObjectMapper();
// java object converted to json
MyClass obj = new MyClass("John", 25);
String json = mapper.writeValueAsString(obj);
System.out.println(json);
// json converted to Java object
MyClass obj2 = mapper.readValue(json, MyClass.class);
System.out.println(obj2.getName());
System.out.println(obj2.getAge());
}
}
// Example of Java class
class MyClass {
private String name;
private int age;
public MyClass() {
}
public MyClass(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
}
Summarize:
The above is the application case of the JSON conversion framework in the Java library.Whether it is GSON or Jackson, they provide easy -to -use APIs that can help developers easily handle the conversion between Java objects and JSON data.Developers can choose the suitable JSON conversion framework according to their needs, and use and learn according to the documents and example code provided by the framework.
I hope this article will be able to understand the application of the JSON conversion framework in the Java class library!
