将部分JSON格式的列表数据转换为映射

Question

I have a following Object Data as below

[{
name = john , id=1,email id  : [abc@gmail.com,def@gmail.com,ghi@gmail.com]
},{
name = joy, id=2,email id  : [jkl@gmail.com,mno@gmail.com,pqr@gmail.com]
}]

I want the following to be converted to Map as

{john=[abc@gmail.com,def@gmail.com,ghi@gmail.com]},{joy= [jkl@gmail.com,mno@gmail.com,pqr@gmail.com]}

in Java how will I be able to achieve this.

Kindly help me with this

Answer 1

no easy way of doing this, so much hard manual work with so many possibilities for errors, you can use this. as long as your data is EXACTLY as shown then this should work.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;




public class Person {




    int id;
    String name;
    List<String> emails;




    public static Person parse(String s) throws Exception {

        Person person = new Person();
        person.name = s.substring(0, s.indexOf(",")).replaceAll(".+= ?", "");
        s = s.substring(s.indexOf(",") + 1, s.length());
        person.id = Integer.parseInt(s.substring(0, s.indexOf(",")).replaceAll(".+= ?", "").trim());
        s = s.substring(s.indexOf(",") + 1, s.length());
        s = s.replaceAll(".+: ?", "").replaceAll("[ \\[\\]]", "");
        person.emails = Arrays.asList(s.split(","));

        return person;

    }




    public static List<Person> parseMany(String s) throws Exception {

        List<Person> people = new ArrayList<Person>();

        while (true){
            int openBracket = s.indexOf("{");
            int closeBracket = s.indexOf("}");

            if(closeBracket == -1){
                break;
            }
            people.add(parse(s.substring(openBracket, closeBracket)));
            s = s.substring(closeBracket + 1, s.length());

        }

        return people;

    }




    public static void main(String[] args) throws Exception {

        String s = "[{name = john , id=1,email id  : [abc@gmail.com,def@gmail.com,ghi@gmail.com]},{name = joy, id=2,email id  : [jkl@gmail.com,mno@gmail.com,pqr@gmail.com]}]";

        List<Person> people = parseMany(s);

        Map<String, List<String>> map = new HashMap<String, List<String>>();

        for(Person person : people){
            map.put(person.name, person.emails);
        }

        System.out.println(map);

    }

}

OUTPUT:

{joy=[jkl@gmail.com, mno@gmail.com, pqr@gmail.com], john =[abc@gmail.com, def@gmail.com, ghi@gmail.com]}

NOTE:

I didn't bother to comment this code, because problem doesn't follow any standard procedures.