通过AJAX将JSON发送到RESTful Service（jersey）返回空值

sorry for asking again but i cant find the solution for my problem - neither here, nor anywhere else. I have a RESTful server using jersey who should consume a JSON via ajax from the client....but it returns a null value. Why??

很抱歉再次询问,但我无法找到问题的解决方案 - 无论是在这里,还是在其他任何地方。我有一个使用泽西的RESTful服务器,它应该从客户端通过ajax使用JSON ....但它返回一个空值。为什么??

REST:

@POST
@Path("/addPoint")
@Consumes({ MediaType.APPLICATION_JSON })
@Produces({ MediaType.APPLICATION_JSON })
public WayPoint addPoint(@QueryParam("coordinate")String coordinate, @QueryParam("RouteId")Long RouteId) {
    WayPoint waypoint = new WayPoint();
    waypoint.setCoordinate(coordinate);
    waypoint.setRouteId(RouteId);
    System.out.println(waypoint);
    return getEntityManager().merge(waypoint);  
}

the object:

@Entity
@XmlRootElement
public class WayPoint {

@Id
@Column(nullable = false)
@GeneratedValue(strategy = GenerationType.TABLE)
private Long id;

private String coordinate;

private Long RouteId;

public Long getId() {
    return id;
}

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

public String getCoordinate() {
    return coordinate;
}

public void setCoordinate(String coordinate) {
    this.coordinate = coordinate;
}

public Long getRouteId() {
    return RouteId;
}

public void setRouteId(Long routeId) {
    this.RouteId = routeId;
}

}

and the AJAX call:

和AJAX电话:

this.AddPoint = function(coords, routeid){
    var test = JSON.stringify({ coordinate: coords, RouteId: routeid });
    console.log(test);
    $.ajax({ 
        url: thePath,
        type: "POST",
        data: JSON.stringify({ coordinate: coords, RouteId: routeid }),
        dataType: "json",
        contentType: "application/json; charset=utf-8",
        success: function(response) {
            alert("new point added!");
            console.log(response);
        },
        error:function(res){
            alert("Cannot save point! " + res.statusText);
        }
    }); 
};

i don't get it...coordinate and RouteId are "null" when i try to extract them that way (via @queryParam)

我不明白...当我尝试以那种方式提取它时,坐标和RouteId是“空”(通过@queryParam)

1 个解决方案

#1

As far as I understand, you can only use @QueryParam for GET requests.

据我了解,您只能将@QueryParam用于GET请求。

For POSTs you can put the object you want to populate as the method parameter and Jersey will instantiate it automatically for you.

对于POST,您可以将要填充的对象作为方法参数,Jersey将自动为您实例化。

I think you just have to ensure that the object to instantiate has the appropriate getters and setters.

我认为你必须确保实例化的对象具有适当的getter和setter。

A GET example:

一个GET示例:

   @GET
   @Path("logout")
   @Produces(MediaType.APPLICATION_JSON)
   public Response logout(@NotNull @QueryParam("user_id") int userId, 
                          @NotNull @QueryParam("token") String token) {

A POST example:

一个POST示例:

  @POST
  @Path("register")
  @Consumes(MediaType.APPLICATION_JSON)
  @Produces(MediaType.APPLICATION_JSON)
  public Response register(RegisterUserParams registerUserParams) {

#1