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"}]

使用的是json-lib.jar包

将json格式的字符数组转为List对象

转载自:http://hbiao68.iteye.com/blog/1771155

另外自己项目中使用hibernate 查询出来的是List<HashMap>,

转换过程 List<HashMap>----->JSONArray---->List<业务对象>  如果是联合查询，则这个业务对象需要加入新的成员变量，

如果加入了并不希望有数据库字段映射，就在属性上加上 @Transient

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]