我试图使用hibernate ORM从数据库中检索数据,并使用Struts2获取输出为json的结果。
一切都可以从数据库中检索数据,
但是对于json结果我只得到{}
。
我认为我的编码做错了。但需要一些帮助才能搞清楚。
这是我的Action类:
@ParentPackage("json-default")
public class SocialIconsAction extends ActionSupport {
private List<TiendayaCurrencies> _currency;
public List<TiendayaCurrencies> getCurrency() {
return _currency;
}
public void setCurrency(List<TiendayaCurrencies> _currency) {
this._currency = _currency;
}
@Action(value = "currencies", results = {
@Result(name = "success", type = "json", params = {"includeProperties",
"_currency\\[\\d+\\]\\..*"})})
@Override
public String execute() {
_currency = loadCurrencies();
/*Nothing wrong with the DB results.Just to test everything works fine.*/
//for (TiendayaCurrencies _currency1 : _currency) {
// System.out.println("Title - "+_currency1.getTitle());
// }
return SUCCESS;
}
private List<TiendayaCurrencies> loadCurrencies() {
Session session = com.tiendaya.connection.HibernateUtil.
getSessionFactory().openSession();
List<TiendayaCurrencies> cList = session.
createCriteria(TiendayaCurrencies.class).list();
return cList;
}
}
Pojo课程:
public class TiendayaCurrencies{
private Integer id;
private String title;
private String code;
private String symbolLeft;
private String symbolRight;
private char decimalPlace;
...
includeProperties有什么问题吗?(只有我能想到的地方......)任何人都可以提出建议......我已经尝试了一切......
编辑:
public class SocialIconsAction extends ActionSupport {
private List<TiendayaCurrencies> _currency=new ArrayList<>();
private String sample="working";
public String getSample() {
return sample;
}
public void setSample(String sample) {
this.sample = sample;
}
...
@Action(value = "currencies", results = {
@Result(name = "success", type = "json", params = {"includeProperties", "sample"})})
...
作为json输出,它给了我: {“sample”:“working”} ,这意味着它工作正常。那么为什么它不能使用 ArrayList ??
答案 0 :(得分:2)
Struts2 JSON插件将序列化您的整个操作,包括带有getter的所有(非瞬态)属性 。
因为你隐藏了你的变量(绝对不是最佳实践,特别是因为它迫使你手动编写每个getter和setter ... brr),并且你有变量和getter的不同名称,你指的是变量,但你应该指向吸气剂(然后是currency
而不是_currency
):
@Action(value = "currencies", results = {
@Result(name = "success",
type = "json",
params = {"includeProperties","currency\\[\\d+\\]\\..*"})
})
另请注意,您可以将described here技术通常优先选择的根对象指定为TOM:
includeProperties