java - 正确地将 JSON 数据发布到 Restful Web 服务 NetBeans

Question

我使用 netbeans 中的“从数据库生成 Web 服务选项”创建了一个 Restful Web 服务。我已将其部署在 Wildfly 中，并注意到虽然 GET 请求有效，但 POST 请求却无效。这是我的 java 代码中接受 POST 连接的部分:

@POST
    @Override
    @Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    public void create(XtgpsActivity entity) {
        super.create(entity);


    }

create 方法采用 XtgpsActivity 类型的参数。这是 XtgpsActivity 类:

//packages and imports list removed
@Entity
@Table(name = "xtgps_Activity")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "XtgpsActivity.findAll", query = "SELECT x FROM XtgpsActivity x"),
    @NamedQuery(name = "XtgpsActivity.findById", query = "SELECT x FROM XtgpsActivity x WHERE x.id = :id")})
public class XtgpsActivity implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "Id")
    private Integer id;
    @JoinColumn(name = "BaseItemId", referencedColumnName = "Id")
    @ManyToOne
    private XtgpsBaseItem baseItemId;
    @OneToMany(mappedBy = "activityId")
    private Collection<XtgpsNearByActivity> xtgpsNearByActivityCollection;

    public XtgpsActivity() {
    }

    public XtgpsActivity(Integer id) {
        this.id = id;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public XtgpsBaseItem getBaseItemId() {
        return baseItemId;
    }

    public void setBaseItemId(XtgpsBaseItem baseItemId) {
        this.baseItemId = baseItemId;
    }

    @XmlTransient
    public Collection<XtgpsNearByActivity> getXtgpsNearByActivityCollection() {
        return xtgpsNearByActivityCollection;
    }

    public void setXtgpsNearByActivityCollection(Collection<XtgpsNearByActivity> xtgpsNearByActivityCollection) {
        this.xtgpsNearByActivityCollection = xtgpsNearByActivityCollection;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof XtgpsActivity)) {
            return false;
        }
        XtgpsActivity other = (XtgpsActivity) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "au.com.xitech.XtgpsActivity[ id=" + id + " ]";
    }

}

这是父类(super class)中的创建方法:

public void create(T entity) {
        getEntityManager().persist(entity);
    }

由于相关表只有两列 id 和 baseitemid，并且 id 是主键，因此我发送的 POST JSON 数据如下:

{"baseitemid":"2"}

但是，当我以这种格式发布数据时，出现错误:

http://localhost:8089/xxx/api/activity/ 400 (Bad Request)

我相信这是因为我发送的 JSON 数据存在问题。为 post 请求创建 JSON 数组的正确方法是什么？

PS:我还在下面附上了我的ajax调用。请注意，我是在浏览器中启用 CORS 后执行此操作的。

$('#submit_it').click(function(e) {
        //console.log("submit button has been clicked");
        e.preventDefault(); //cancel form submit

        var jsObj = $post_example.serializeObject()
            , ajaxObj = {};

        //console.log(jsObj);
        alert(JSON.stringify(jsObj));
        ajaxObj = {  
            type: "POST",
            url: "http://localhost:8089/xxx/api/activity/", 
            data: JSON.stringify(jsObj),
            contentType:"application/json",
            success: function(data) { 
                //console.log(data);
                if(data[0].HTTP_CODE == 200) {
                    $('#div_ajaxResponse').text( data[0].MSG );
                }
            },
            error: function(jqXHR, textStatus, errorThrown) {
                console.log("Error " + jqXHR.getAllResponseHeaders() + " " + errorThrown);
            },

            complete: function(XMLHttpRequest) {
                //console.log( XMLHttpRequest.getAllResponseHeaders() );
            }, 
            dataType: "json" //request JSON
        };

        $.ajax(ajaxObj);
    });

Answer 1

json 中传递的值被解析为数值，因此发送为(不带引号的值)

{
  "baseitemid":2
  }

成功了。