002.JDK方式——JSONObjectJSONArray

Posted 2022-07-15 wx62cfec15551e8

 

 

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);