Introduction to common tool categories supporting the "JSON In Java" framework in the Java class library
Introduction to common tool categories supporting the "JSON In Java" framework in the Java class library
With the development of Internet applications, JSON (JavaScript Object Notation), as a lightweight data exchange format, is widely used in front -end data transmission and storage.In order to facilitate developers to process JSON data in Java, many excellent class libraries and tools have been developed.This article will introduce a common tool class that supports the "JSON in Java" framework in the Java library.
1. GSON: GSON is a powerful Java JSON library of Google's open source.It can convert the Java object to the JSON string, and can turn the JSON string back -sequence to the Java object.GSON provides rich methods and annotations that can flexibly control JSON's serialization and dependentization process.
Below is an example code using GSON:
import com.google.gson.Gson;
// Create a Java object
class Person {
String name;
int age;
String email;
}
public class Main {
public static void main(String[] args) {
// Convert java objects to json string
Person person = new Person();
Person.name = "Zhang San";
person.age = 25;
person.email = "zhangsan@example.com";
Gson gson = new Gson();
String json = gson.toJson(person);
System.out.println(json);
// Turn the JSON string back -sequencing into the Java object
String jsonstring = "{\" name \ ": \" Li Si \ ", \" Age \ ": 30," email \ ": \" lisi@example.com \ "}";
Person deserializedPerson = gson.fromJson(jsonString, Person.class);
System.out.println(deserializedPerson.name);
System.out.println(deserializedPerson.age);
System.out.println(deserializedPerson.email);
}
}
2. Jackson: Jackson is another popular Java JSON library, developed and maintained by FASTERXML.It provides rich characteristics, including binding between JSON and Java objects, supporting streaming processing, etc.Jackson can easily convert the Java object to a JSON string, and transformed the JSON string backlier to the Java object.
Below is an example code using Jackson:
import com.fasterxml.jackson.databind.ObjectMapper;
public class Main {
public static void main(String[] args) throws Exception {
// Convert java objects to json string
ObjectMapper objectMapper = new ObjectMapper();
Person person = new Person();
Person.name = "Zhang San";
person.age = 25;
person.email = "zhangsan@example.com";
String json = objectMapper.writeValueAsString(person);
System.out.println(json);
// Turn the JSON string back -sequencing into the Java object
String jsonstring = "{\" name \ ": \" Li Si \ ", \" Age \ ": 30," email \ ": \" lisi@example.com \ "}";
Person deserializedPerson = objectMapper.readValue(jsonString, Person.class);
System.out.println(deserializedPerson.name);
System.out.println(deserializedPerson.age);
System.out.println(deserializedPerson.email);
}
}
3. JSON-LIB: JSON-LIB is a powerful Java class library with support for multiple JSON processing methods.It provides JSONObject and JSONARAY, which can easily construct and analyze the JSON objects.JSON-LIB also supports converting Java objects into JSON string, and transformed the JSON string back sequence to Java objects.
The following is a sample code using JSON-LIB:
import net.sf.json.JSONObject;
import net.sf.json.JSONArray;
public class Main {
public static void main(String[] args) {
// Convert java objects to json string
JSONObject json = new JSONObject();
json.put ("name", "Zhang San");
json.put("age", 25);
json.put("email", "zhangsan@example.com");
String jsonString = json.toString();
System.out.println(jsonString);
// Turn the JSON string back -sequencing into the Java object
String jsonstring = "{\" name \ ": \" Li Si \ ", \" Age \ ": 30," email \ ": \" lisi@example.com \ "}";
JSONObject jsonObject = JSONObject.fromObject(jsonString);
String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
String email = jsonObject.getString("email");
System.out.println(name);
System.out.println(age);
System.out.println(email);
}
}
The above is a commonly used tool class that supports the "JSON In Java" framework in the Java library.These tools can effectively help developers process JSON data in Java, making the serialization and desertification of data simple and flexible.Whether using GSON, Jackson or JSON-LIB, developers can choose the most suitable tool class according to their needs to process JSON data.
