What package does java use to parse json?

Toolkitorg.json.jar is a lightweight json construction and parsing toolkit under JAVA. It also includes conversion of JSON to XML, HTTP headers, Cookies, and CDL.

Recommended here: Alibaba FastJson is a Json processing toolkit, including "serialization" and "deserialization". It has the following characteristics:
Fastest speed, testing It shows that fastjson has extremely fast performance, surpassing any other Java Json parser. Including JackJson, which claims to be the fastest;

Recommended courses: Java Tutorial.

is powerful and fully supports Java Beans, collections, Maps, dates, Enums, supports paradigms, and supports introspection; has no dependencies and can run directly on Java SE 5.0 or above. ;Support Android; Open source (Apache 2.0)

Source code address:

https://github.com/alibaba/fastjson

The Fastjson API entry class is com.alibaba.fastjson.JSON. Common serialization operations can be completed directly through static methods on the JSON class.

public static final Object parse(String text); // Parse JSON text into JSONObject or JSONArray
public static final JSONObject parseObject(String text); // Parse JSON text into JSONObject
public static final T parseObject(String text, Class clazz); // Parse JSON text into JavaBean
public static final JSONArray parseArray(String text); // Parse JSON text into JSONArray
public static final List parseArray (String text, Class clazz); //Parse JSON text into a JavaBean collection
public static final String toJSONString(Object object); //Serialize JavaBean into JSON text
public static final String toJSONString(Object object , boolean prettyFormat); // Serialize JavaBean into formatted JSON text
public static final Object toJSON(Object javaObject); Convert JavaBean to JSONObject or JSONArray.

The above are common methods in some projects.

The following is the code I wrote for practice:

package com.test;
 
public class TestPerson {
    private int age;
    private String name;
     
    public TestPerson(){
         
    }
     
    public TestPerson(int age,String name){
        this.age=age;
        this.name=name;
    }
     
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}
 
 
 
package com.test;
import java.util.*;
 
import com.alibaba.fastjson.*;
 
public final class TestFastJson {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
         
        TestPerson json = new TestPerson(19,"李明");
        List<TestPerson> list = new ArrayList<TestPerson>();
        list.add(json);
        list.add(new TestPerson(12,"张三"));
        //将集合或者对象序例化成JSON
        System.out.println(JSON.toJSON(json));
        System.out.println( JSON.toJSON(list) );
        //Json串反序列化成对象
        TestPerson person = JSON.parseObject("{\"name\":\"李明\",\"age\":19}", TestPerson.class);
        System.out.printf("name:%s,age:%d\n",person.getName(),person.getAge());
         
        String str = "[{\"name\":\"李明\",\"age\":19},{\"name\":\"张三\",\"age\":12}]";
        //数组对象反序列化成集合
        List<TestPerson> listPerson = JSON.parseArray(str,TestPerson.class);
         
        for(TestPerson item : listPerson){
            System.out.println( item.getName() );
            System.out.println( item.getAge());
        }
         
        //没有对象直接解析JSON对象
        JSONObject jobj = JSON.parseObject("{\"name\":\"李明\",\"age\":19}");
        System.out.printf("name:%s,age:%d\n",jobj.getString("name"),jobj.getBigInteger("age"));
         
        //没有对象直接解析JSON数组
        JSONArray jarr = JSON.parseArray("[{\"name\":\"李明\",\"age\":19},{\"name\":\"张三\",\"age\":12}]");
         
        for(int i=0,len=jarr.size();i<len;i++){
            JSONObject temp=  jarr.getJSONObject(i);
            System.out.printf("name:%s,age:%d\n",temp.getString("name"),temp.getBigInteger("age"));
        }
         
        for(Object obj:jarr){
            System.out.println(obj.toString());
        }
         
    }
 
}

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