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我试图使用休眠 ORM 从数据库中检索数据,并使用 Struts2 将输出作为 json 结果。一切都可以从数据库中检索数据,但对于 json 结果,我只得到{}.

我认为我的编码做错了。但是需要一些帮助才能弄清楚。

这是我的动作课:

@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类:

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..)任何人都可以提出一种方法.. 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。那么为什么它不能与ArrayList一起使用?

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1 回答 1

2

Struts2 JSON 插件将序列化您的整个操作,包括所有(非瞬态)属性与 getter

由于您隐藏了变量(绝对不是最佳实践,尤其是因为它迫使您手动编写每个 getter 和 setter...brr),并且变量和 getter 的名称不同,因此您指向变量,但你应该指向吸气剂(然后currency而不是_currency):

@Action(value = "currencies", results = {
    @Result(name = "success", 
            type = "json", 
          params = {"includeProperties","currency\\[\\d+\\]\\..*"})
})

另请注意,您可以指定一个根对象,这通常比该includeProperties技术更受欢迎,如下所述

@Action(value = "currencies", results = {
    @Result(name = "success", 
            type = "json", 
          params = {"root","currency"})
})
于 2015-11-02T09:44:31.063 回答