public class orgs {

    private String id;

    private String name;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

public class users {

    private String id;

    private String name;

    private String password;

    private String address;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getPassword() {

        return password;

    }

    public void setPassword(String password) {

        this.password = password;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

}

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class Test {

    /**

     *

     * @param args

     */

    public static void main(String[] args) {

        users users=new users();

        users.setId("1111");

        users.setName("张三");

        users.setPassword("888888");

        users.setAddress("xxx省");

        users u1=new users();

        u1.setId("2222");

        u1.setName("李四");

        u1.setPassword("888888");

        u1.setAddress("xxx省");

        orgs orgs=new orgs();

        orgs.setId("1111");

        orgs.setName("xxx省xxx单位");

        JSONObject obj=new JSONObject();

        JSONArray userArr=new JSONArray();

        JSONArray orgArr=new JSONArray();

        JSONObject json = JSONObject.fromObject(users);

        JSONObject json1 = JSONObject.fromObject(u1);

        JSONObject orgJson = JSONObject.fromObject(orgs);

        userArr.add(json.toString());

        userArr.add(json1.toString());

        orgArr.add(orgJson.toString());

        obj.put("users", userArr.toString());

        obj.put("orgs", orgArr.toString());

        System.out.println(obj.toString());

    }

}

{

    "users": [

        {

            "address": "xxx省",

            "id": "1111",

            "name": "张三",

            "password": "888888"

        },

        {

            "address": "xxx省",

            "id": "2222",

            "name": "李四",

            "password": "888888"

        }

    ],

    "orgs": [

        {

            "id": "1111",

            "name": "xxx省xxx单位"

        }

    ]

}