The conversion between java entity class and json entity class collection and jsonArray

package com.fh.test;

import java.io.IOException;
import java.util.ArrayList;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fh.panghu.entity.User;

import net.sf.json. JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JSONSerializer;
import net.sf.json.JsonConfig;

/**
*
* @author fcbird
* With the help of the third-party jar package of net.sf.json The class completes the conversion between entity class and json object, entity class collection and jsonArray conversion
*
*/
public class TestJsonEntityListMap { @SuppressWarnings

   ("unchecked")
   public static void getData() {


       JSONObject objec1t = new JSONObject();
       JSONObject objec2t = new JSONObject();
       JSONArray jsonArray = new JSONArray();
       ArrayList<User> users = new ArrayList<User>();
       ArrayList<User> users12 = new ArrayList<User>();
       JsonConfig   jsonConfig = new JsonConfig();
       ObjectMapper objectMapper=new ObjectMapper();
       User user= new User();
       User user12= new User();
       //构造数据
       user.setDdid("ddid");
       user.setMobile("mobile");
       user.setUserid("password");
       user.setPassword("userid");
       user.setUsername("username");

       user12.setDdid("ddid1");
       user12.setMobile("mobile1");
       user12.setUserid("password1");
       user12.setPassword("userid1");
       user12.setUsername("username1");

       objec1t.put("ddid", "ddid1");
       objec1t.put("mobile", "mobile1");
       objec1t.put("password", "password1");
       objec1t.put("userid", "userid1");
       objec1t.put("username", "username1");

       objec2t.put("ddid", "ddid2");
       objec2t.put("mobile", "mobile2");
       objec2t.put("password", "password2");
       objec2t.put("userid", "userid2");
       objec2t.put("username", "username2");

       users.add(user);
       users.add(user12);

       jsonArray.add(objec1t);
       jsonArray.add(objec2t);

       //Entities are converted to JSON objects
       //The first
       Strings of entities are converted to JSON objects jsonString1 = JSONSerializer.toJSON(user).toString( );
       //Entities are converted to JSON objects. The second
       String jsonString2 = JSONObject.fromObject(user).toString();
       //JSON objects are converted to entities .
       //The JSON objects are converted to entities. The first type of
       User user1=(User)JSONObject .toBean(objec1t, User.class);
       User user2 = new User();
       try {
           //The second JSON object is converted to an entity
           user2=objectMapper.readValue(objec1t.toString(), User.class);
       } catch ( IOException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }

       //The entity class collection is converted to JSONArray
       String jsonArrayString = JSONArray.fromObject(users, jsonConfig).toString();

       users12 = (ArrayList<User>) JSONArray.toCollection (jsonArray,User.class);

       System.out.println("The entity is converted to json1:"+jsonString1);
       System.out.println("The entity is converted to json2:"+jsonString2);
       System.out.println("json1 Convert to entity :"+user1);
       System.out.println("json2 convert to entity:"+user2);
       System.out.println("entity collection convert to jsonArray:"+jsonArrayString);
       System.out.println( "jsonArray to entity collection:"+users12);

   }
   public static void main(String[] args) {
       getData();
   }
}

Screenshot of test results:

The conversion between java entity class and json entity class collection and jsonArray

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