Overview of the UJSON framework in the Java library
Ujson (JODD JSON) is a Java class library for processing JSON data.It provides a set of simple and easy -to -use APIs to analyze, read, write, and process JSON format.
Ujson provides the following main features in Java:
1. JSON analysis and generation: UJSON can resolve the JSON string as a Java object and convert the Java object to the JSON string.It supports JSON data from the string, character stream, and byte flow, and can write JSON data into string, character stream, and byte flow.
The following is a simple JSON analysis example:
import jodd.json.JsonParser;
import jodd.json.JsonParserBuilder;
String jsonString = "{\"name\":\"John\", \"age\":30}";
JsonParser parser = new JsonParserBuilder().build();
Object jsonObject = parser.parse(jsonString);
// JSONObject after the analysis
String name = jsonObject.getString("name");
int age = jsonObject.getInt("age");
System.out.println("Name: " + name);
System.out.println("Age: " + age);
2. Object to JSON conversion: UJSON can convert Java objects to json format string.It supports data in Java collection, array and custom objects into JSON format.
The following is an example of the object to JSON conversion:
import jodd.json.JsonSerializer;
import jodd.json.JsonSerializerBuilder;
class Person {
String name;
int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
}
Person person = new Person("John", 30);
JsonSerializer serializer = new JsonSerializerBuilder().build();
String json = serializer.serialize(person);
System.out.println("JSON: " + json);
The output result is: {"name": "John", "Age": 30} `
3. JSON data processing: UJSON provides some convenient ways to process JSON data.For example, it can merge two JSON objects, extract the value of the specified key, and find the values under the specified path.
Here are several examples of processing JSON data:
import jodd.json.JsonObject;
import jodd.json.JsonVisitor;
import jodd.json.meta.JSON;
@JSON(strict = true)
class Person {
String name;
int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
}
Person person = new Person("John", 30);
JsonObject jsonObject = new JsonObject();
jsonObject.putValue("name", "John");
jsonObject.putValue("age", 30);
// Merge two JSON objects
JsonObject mergedJsonObject = jsonObject.merge(jsonObject2);
// Extract the value of the specified key
String name = jsonObject.getString("name");
// Use JSONVISITOR to access JSON objects
JsonVisitor visitor = new JsonVisitor();
jsonObject.visit(visitor);
System.out.println("Merged JSON: " + mergedJsonObject);
System.out.println("Name: " + name);
System.out.println("Visited JSON: " + visitor.getResult());
UJSON is a lightweight JSON processing library, which has simple and powerful functions. It is suitable for analysis, generation and processing JSON data.It can easily integrate with Java applications and easy to use.
