Store data in json format

method one:

traditional method:

 Code:

package Arraylist;

import java.util.ArrayList;
import java.util.List;
import org.json.JSONObject;

public class Main {

	public static Main a;
	static void String(){
       
	JSONObject jsonObject = new JSONObject();
	jsonObject.put("name","ASR1000");
	jsonObject.put("status","Warning");
        JSONObject jsonObject1 = new JSONObject();
        jsonObject1.put("basic","Warning");
        jsonObject1.put("device","CS1006"); 
        JSONObject jsonObject3 = new JSONObject();
        jsonObject3.put("Error", 0);
        jsonObject3.put("OK",0);
        JSONObject jsonObject4 = new JSONObject();
        jsonObject4.put("name", "CS100");
        jsonObject4.put("status", "Warning");     
        JSONObject jsonObject5 = new JSONObject();
        jsonObject5.put("name", "basic");
        jsonObject5.put("status", "Warning");     
        JSONObject jsonObject6 = new JSONObject();
        jsonObject6.put("name", "show");
        jsonObject6.put("status", "Warning");     
        JSONObject jsonObject7 = new JSONObject();    
        jsonObject7.put("name", "software");
        jsonObject7.put("value", "IO");
        
        List<JSONObject> jsonObjects = new ArrayList<JSONObject>();
        jsonObjects.add(jsonObject1);
        List<JSONObject> jsonObjects1 = new ArrayList<JSONObject>();
        jsonObjects1.add(jsonObject3);
        List<JSONObject> jsonObjects2 = new ArrayList<JSONObject>();
        jsonObjects2.add(jsonObject4);
        List<JSONObject> jsonObjects3 = new ArrayList<JSONObject>();
        jsonObjects3.add(jsonObject5);
        List<JSONObject> jsonObjects4 = new ArrayList<JSONObject>();
        jsonObjects4.add(jsonObject6);
        List<JSONObject> jsonObjects5 = new ArrayList<JSONObject>();
        jsonObjects5.add(jsonObject7);
        jsonObject.put("devicegs",jsonObjects);
        jsonObject.put("familys",jsonObjects1);
        jsonObject.put("devices",jsonObjects2);
        jsonObject4.put("groups", jsonObjects3);
        jsonObject5.put("commands", jsonObjects4);
        jsonObject6.put("items", jsonObjects5);
        System.out.println(jsonObject);
    }
	public static void main(String[] args) {
		a = new Main();
		Main.String();
	}

}

operation result

Method Two:

Encapsulate the object before writing.

Code:

1.Instance.class

package ArraylistFZ;

import java.util.ArrayList;
public class Instance {
	 //同级元素
	  private String Fname;
	  private String Fstatus;
	  //同级对象
	 private ArrayList<Devicegs> device;
	 private ArrayList<Familygs> family_;
	 private ArrayList<Devices> devices;
	public String getFname() {
		return Fname;
	}
	public void setFname(String fname) {
		Fname = fname;
	}
	public String getFstatus() {
		return Fstatus;
	}
	public void setFstatus(String fstatus) {
		Fstatus = fstatus;
	}
	public ArrayList<Devicegs> getDevice() {
		return device;
	}
	public void setDevice(ArrayList<Devicegs> device) {
		this.device = device;
	}
	public ArrayList<Familygs> getFamily_() {
		return family_;
	}
	public void setFamily_(ArrayList<Familygs> family_) {
		this.family_ = family_;
	}
	public ArrayList<Devices> getDevices() {
		return devices;
	}
	public void setDevices(ArrayList<Devices> devices) {
		this.devices = devices;
	}
	@Override
	public String toString() {
		return "Instance [Fname=" + Fname + ", Fstatus=" + Fstatus + ", device=" + device + ", family_=" + family_
				+ ", devices=" + devices + "]";
	}
	
	
	
	
	
	 
}

2.Devices.class

package ArraylistFZ;

import java.util.ArrayList;

public class Devices {
	private String name;
	private String status;
	private ArrayList<Groups> groups;
	
	public ArrayList<Groups> getGroups() {
		return groups;
	}
	public void setGroups(ArrayList<Groups> groups) {
		this.groups = groups;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getStatus() {
		return status;
	}
	public void setStatus(String status) {
		this.status = status;
	}
	@Override
	public String toString() {
		return "Devices [name=" + name + ", status=" + status + ", groups=" + groups + "]";
	}
	
	
	
	
}

3.Groups.class

package ArraylistFZ;

public class Groups {
	private String name;
	private String status;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getStatus() {
		return status;
	}
	public void setStatus(String status) {
		this.status = status;
	}
	@Override
	public String toString() {
		return "Groups [name=" + name + ", status=" + status + "]";
	}
	
	
	
}

4.Main.class

package ArraylistFZ;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;

public class Main {
	public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException {
		Instance instance=new Instance();
		instance.setFname("ASR1000");
		instance.setFstatus("Warning");
		//设置devicegs同级
		Devicegs devicegs1=new Devicegs();
		devicegs1.setDgsbasic("Warning");
		devicegs1.setDgsdevice("CS1006");
		//设置familygs同级
		Familygs familygs1=new Familygs();
		familygs1.setFgsError("0");
		familygs1.setFgsOK("0");
		//设置子级groups（Devices)
		Groups groups1=new Groups();
		groups1.setName("basic");
		groups1.setStatus("Warning");
		//设置devices同级
		Devices devices1 = new Devices();
		devices1.setName("CS100");
		devices1.setStatus("Warning");
		
		ArrayList<Devicegs> list1 = new ArrayList<Devicegs>();
		list1.add(devicegs1);
		ArrayList<Familygs> list2 =new ArrayList<Familygs>();
		list2.add(familygs1);
		ArrayList<Devices> list3=new ArrayList<Devices>();
		list3.add(devices1);
		ArrayList<Groups> list4 = new ArrayList<Groups>();
		list4.add(groups1);
		devices1.setGroups(list4);
		
		instance.setDevice(list1);
		instance.setFamily_(list2);
		instance.setDevices(list3);
		
		ObjectMapper mapper = new ObjectMapper();
		List<Instance> users = new ArrayList<Instance>();
	     users.add(instance);   
	     String jsonlist = mapper.writeValueAsString(users);
	     System.out.println(jsonlist);   
		}
	}

operation result:

Added jar package: json and jackson