json数组和List转换

package hb;

import java.util.Date;

public class Person {

    String id;

    int age;

    String name;

    Date birthday;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

}

package hb;

import java.util.Iterator;

import java.util.List;

import org.junit.Test;

import net.sf.json.JSONArray;

import net.sf.json.JsonConfig;

public class JsonToList {

    public static void main(String[] args) {

        String json="[{'name':'huangbiao','age':15},{'name':'liumei','age':14}]";

        JSONArray jsonarray = JSONArray.fromObject(json);

        System.out.println(jsonarray);

        List list = (List)JSONArray.toCollection(jsonarray, Person.class);

        Iterator it = list.iterator();

        while(it.hasNext()){

            Person p = (Person)it.next();

            System.out.println(p.getAge());

        }

    }

    @Test

    public void jsonToList1(){

        String json="[{'name':'huangbiao','age':15},{'name':'liumei','age':14}]";

        JSONArray jsonarray = JSONArray.fromObject(json);

        System.out.println(jsonarray);

        List list = (List)JSONArray.toList(jsonarray, Person.class);

        Iterator it = list.iterator();

        while(it.hasNext()){

            Person p = (Person)it.next();

            System.out.println(p.getAge());

        }

    }

    @Test

    public void jsonToList2(){

        String json="[{'name':'huangbiao','age':15},{'name':'liumei','age':14}]";

        JSONArray jsonarray = JSONArray.fromObject(json);

        System.out.println(jsonarray);

        System.out.println("------------");

        List list = (List)JSONArray.toList(jsonarray, new Person(), new JsonConfig());

        Iterator it = list.iterator();

        while(it.hasNext()){

            Person p = (Person)it.next();

            System.out.println(p.getAge());

        }

    }

}

package hb;

import java.util.LinkedList;

import java.util.List;

import net.sf.json.JSONArray;

public class ListToJson {

    public static void main(String[] args) {

        List list = new LinkedList();

        for(int i=0;i<3;i++){

            Person p = new Person();

            p.setAge(i);

            p.setName("name"+i);

            list.add(p);

        }

        JSONArray jsonarray = JSONArray.fromObject(list);

        System.out.println(jsonarray);

    }

}

[{"age":0,"birthday":null,"id":"","name":"name0"},{"age":1,"birthday":null,"id":"","name":"name1"},{"age":2,"birthday":null,"id":"","name":"name2"}]

public class PaymentReq implements Serializable {

    private static final long serialVersionUID = -1515222020971048819L;

//     u.userId,u.userName,u.openId,u.sex,u.phone,u.userPaymentMoney,pr.paymentReqId,pr.addTime

    @Id

    @GeneratedValue(strategy = GenerationType.IDENTITY)

    private Long paymentReqId;

    private String addTime;

    private Long userId;

    @Transient

    private String userName;

    @Transient

    private String openId;

    @Transient

    private String sex;

    @Transient

    private String phone;

    @Transient

    private String userPaymentMoney;

public List<HashMap> findAllPaymentReqByUserId(Long userId){

            Session session = sessionFactory.getCurrentSession();

            StringBuffer sql=new StringBuffer("select u.userId,u.userName,u.openId,u.sex,u.phone,u.userPaymentMoney,pr.paymentReqId,pr.addTime ");

            sql.append("from user u,paymentreq pr ");

            sql.append("where u.userId=pr.userId ");

            sql.append("and u.userPaymentMoney>'0' ");

            sql.append("order by pr.addTime asc");

            Query query = session.createSQLQuery(sql.toString()).setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP);

            List<HashMap> list = query.list();

            return list;

        }

@Test

    public void testfindAllPaymentReqByUserId(){

        List<HashMap> list=paymentReqService.findAllPaymentReqByUserId(1L);

        JSONArray jsonArray=JSONArray.fromObject(list);

         List list_ = (List)JSONArray.toCollection(jsonArray, PaymentReq.class);

         for(int i=0;i<list_.size();i++){

             PaymentReq pr=(PaymentReq)list_.get(i);

             System.out.println(pr);

         }

    }

//打印结果

PaymentReq [paymentReqId=1, addTime=2014-11-15 19:27:23, userId=1, userName=text, openId=1, sex=0, phone=18681883016, userPaymentMoney=2.01]

PaymentReq [paymentReqId=2, addTime=2014-11-15 19:27:23, userId=2, userName=text, openId=null, sex=0, phone=18681883015, userPaymentMoney=10]