002.JDK方式——JSONObject、JSONArray

 

 

package com.jkd.entity;

public class Computer
{
    public String cpu;
    public String disk;

    public String getCpu()
    {
        return cpu;
    }

    public void setCpu(String cpu)
    {
        this.cpu = cpu;
    }

    public String getDisk()
    {
        return disk;
    }

    public void setDisk(String disk)
    {
        this.disk = disk;
    }

    @Override
    public String toString()
    {
        return "Computer{" + "cpu='" + cpu + '\'' + ", disk='" + disk + '\'' + '}';
    }
}

package com.jkd.entity;

import java.util.ArrayList;

public class School
{
    public String name;
    public Computer computer;
    public ArrayList<Student> students;

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public Computer getComputer()
    {
        return computer;
    }

    public void setComputer(Computer computer)
    {
        this.computer = computer;
    }

    public ArrayList<Student> getStudents()
    {
        return students;
    }

    public void setStudents(ArrayList<Student> students)
    {
        this.students = students;
    }

    @Override
    public String toString()
    {
        return "School{" + "name='" + name + '\'' + ", computer=" + computer + ", students=" + students + '}';
    }
}

package com.jkd.entity;

public class Student
{
    public String name;
    public int age;
    public String sex;

    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;
    }

    public String getSex()
    {
        return sex;
    }

    public void setSex(String sex)
    {
        this.sex = sex;
    }

    @Override
    public String toString()
    {
        return "Student{" + "name='" + name + '\'' + ", age=" + age + ", sex='" + sex + '\'' + '}';
    }
}

package com.jdk.json;

import com.jkd.entity.Computer;
import com.jkd.entity.School;
import com.jkd.entity.Student;
import org.json.JSONArray;
import org.json.JSONObject;

import java.util.ArrayList;

public class JsonA
{
    public static String jsonString = "{\n" +
            "    \"name\": \"teacher\",\n" +
            "    \"computer\": {\n" +
            "        \"CPU\": \"intel7\",\n" +
            "        \"disk\": \"512G\"\n" +
            "    },\n" +
            "    \"students\": [\n" +
            "        {\n" +
            "            \"name\": \"张三\",\n" +
            "            \"age\": 18,\n" +
            "            \"sex\": \"男\"\n" +
            "        },\n" +
            "        {\n" +
            "            \"name\": \"李四\",\n" +
            "            \"age\": 19,\n" +
            "            \"sex\": \"男\"\n" +
            "        }\n" +
            "    ]\n" +
            "}\n";


    public static void main(String[] args)
    {
        // 将Json转换为Java对象

        School school=new School();
        /**
         * 1.导入包import org.json.JSONObject
         */
        JSONObject jsonObject = new JSONObject(jsonString);
        String name = (String) jsonObject.get("name");
        school.setName(name);


        JSONObject computerJsonObject = jsonObject.getJSONObject("computer");
        Computer computer=new Computer();
        String cpu = (String) computerJsonObject.get("CPU");
        String disk = (String) computerJsonObject.get("disk");
        computer.setCpu(cpu);
        computer.setDisk(disk);

        school.setComputer(computer);


        ArrayList<Student> studentsList=new ArrayList<>();
        JSONArray studentsJSONArray = jsonObject.getJSONArray("students");
        for (int i=0;i<studentsJSONArray.length();i++)
        {
            JSONObject jsonObject1 = studentsJSONArray.getJSONObject(i);
            String name1 = (String) jsonObject1.get("name");
            int age = (int) jsonObject1.get("age");
            String sex = (String) jsonObject1.get("sex");
            Student student=new Student();
            student.setName(name1);
            student.setAge(age);
            student.setSex(sex);
            studentsList.add(student);
        }
        school.setStudents(studentsList);

        System.out.println(school);
        System.out.println("--------------------");
        //java转json
        String s = jsonObject.toString();
        System.out.println(s);

    }
}