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json数组和List转换
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互联网集市收集整理的这篇技术教程文章主要介绍了json数组和List转换，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4413字，纯文字阅读大概需要7分钟。
内容图文
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;
}
publicint getAge() {
return age;
}
publicvoid setAge(int age) {
this.age = age;
}
public String getName() {
return name;
}
publicvoid setName(String name) {
this.name = name;
}
public Date getBirthday() {
return birthday;
}
publicvoid 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
publicvoid 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
publicvoid 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 {
privatestaticfinallong 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]
原文：http://www.cnblogs.com/qq-757617012/p/4100151.html
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