JavaBean,List,Map,json格式之间转化方式

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"}}]
        */
    }
}

　参考：http://blog.csdn.net/encienqi/article/details/7840532