public class TestBean {

    private String id;

    private String name;

    private String password;

    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 class test {

    public static void main(String[] args) {

        List<TestBean> list = new ArrayList<TestBean>();

        TestBean ts1 = new TestBean();

        ts1.setId("1");

        ts1.setName("a");

        ts1.setPassword("aaa");

        TestBean ts2 = new TestBean();

        ts2.setId("2");

        ts2.setName("b");

        ts2.setPassword("bbb");

        TestBean ts3 = new TestBean();

        ts3.setId("3");

        ts3.setName("c");

        ts3.setPassword("ccc");

        list.add(0,ts1);

        list.add(1,ts2);

        list.add(2,ts3);

        /*JavaBean2JSONObject & JavaBean2JSONArray */

        JSONObject beanObj = JSONObject.fromObject(ts1);

        JSONArray  beanArr = JSONArray.fromObject(ts1);

        System.out.println(beanObj);

        System.out.println(beanArr);

        /*result

        * {"id":"1","name":"a","password":"aaa"}

        * [{"id":"1","name":"a","password":"aaa"}]

        */

        /*List2JSONObject & List2JSONArray */

        JSONObject obj = JSONObject.fromObject(ts1);

        JSONArray arr = JSONArray.fromObject(list);

        System.out.println(obj);

        System.out.println(arr);

        /*result:

        *{"id":"1","name":"a","password":"aaa"}

        *[{"id":"1","name":"a","password":"aaa"},{"id":"2","name":"b","password":"bbb"},{"id":"3","name":"c","password":"ccc"}]

        */

        /*Map2JSONObject*/

        Map<String,Object> listMap = new HashMap();

        listMap.put("list",list);

        JSONArray mapArr = JSONArray.fromObject(listMap);

        Map<String,Object> beanMap = new HashMap();

        beanMap.put("id",ts1);

        JSONArray beanMapArr = JSONArray.fromObject(beanMap);

        System.out.println(mapArr);

        System.out.println(beanMapArr);

        /*result

         *[{"list":[{"id":"1","name":"a","password":"aaa"},{"id":"2","name":"b","password":"bbb"},{"id":"3","name":"c","password":"ccc"}]}]

         *[{"id":{"id":"1","name":"a","password":"aaa"}}]

        */

    }

}