DataTables的JSON数据中缺少根元素[重复]

Question

由于缺少“根”元素，我无法填充我的数据表。

请查看下面的代码并帮助我解决它。

第 1 部分：

  $('#example').DataTable({
       //"ajax": "density.txt",
       "ajax" : "getProductPropData",
       "dataType": 'json',
       "contentType": "application/json; charset=utf-8",
        "columns": [{
            "data": "densityId"
        }, {
            "data": "densityDescription"
        }, {
            data: null,
            className: "center",
            defaultContent: '<a href="#" id="edit" class="edit" data-toggle="modal" data-target="#myModal">Edit</a> / <a href="#" id="delete">Delete</a>'
                //defaultContent: '<button type="button" class="btn-default" data-toggle="modal" data-target="#myModal">Open Modal</button>'
        }]
    });

---

第 2 部分：我在 Struts 2 动作课程中所做的事情。

public String execute() throws Exception {

    SessionFactory sf = (SessionFactory) ctx.getAttribute("SessionFactory");
    ProductPropertyDAO pdao = new ProductPropertyDAOImpl(sf);
    List<DensityGroup> dg = pdao.getProductPropListData("Density");

    List<DensityGroup> list = new ArrayList<DensityGroup>();
    System.out.println("SIZE is: " + dg.size());

    for (int i = 0; i < dg.size(); i++) {
        DensityGroup denpojo = new DensityGroup();
        denpojo.setDensityId(dg.get(i).getDensityId());
        denpojo.setDensityDescription(dg.get(i).getDensityDescription());
        list.add(denpojo);
    }

    data = list;

    System.out.println("JSON is :\n" + data);
    return "success";
  }

---

Chrome 网络标签中的我的 JSON 数据是：

[{"densityDescription":"16 KG","densityId":"21"},
{"densityDescription":"Chitti","densityId":"22"}]

正确的数据应该是：

{"data" : [{"densityDescription":"16 KG","densityId":"21"},
{"densityDescription":"Chitti","densityId":"22"}]}

编辑数据变量：

private List<DensityGroup> data;

    public List<DensityGroup> getData() {
        return data;
    }

    public void setData(List<DensityGroup> data) {
        this.data = data;
    }

DensityGroup.java

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;

@Entity
@Table(name="DENGROUP")
public class DensityGroup{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Id
    @Column (name = "DEN_ID")
    @SequenceGenerator(name="dengroupSeq",sequenceName="density_group_seq")
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="dengroupSeq")


    private String densityId;
    public String getDensityId() {
        return densityId;
    }
    public void setDensityId(String densityId) {
        this.densityId = densityId;
    }
    public String getDensityDescription() {
        return densityDescription;
    }
    public void setDensityDescription(String densityDescription) {
        this.densityDescription = densityDescription;
    }
    @Column (name = "DEN_DESC")
    private String densityDescription;
}

Answer 1

使用ajax.dataSrc 选项设置为空字符串。

例如：

"ajax" : {
   "url": "getProductPropData",
   "dataSrc": "",
   "dataType": 'json',
   "contentType": "application/json; charset=utf-8"
}

有关代码和演示，请参阅 this example。