jersey资源response怎样返回JSon而不是对象

返回的如果是java实体，前端收到的是JSon,当返回的实体放进response中时，前端收到的就是对象而不是Json了，这是怎么回事，我需要传JSon

下面贴resource代码
@Path("/User")
public class UserResource
{
@GET
@Path("/")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public StudentEntity query(){
StudentEntity studentEntity = new StudentEntity();
BookEntity bookEntity = new BookEntity();
bookEntity.setId((long) 12321);
bookEntity.setAge(18);
bookEntity.setName("王二小");
studentEntity.setId((long) 12321);
studentEntity.setAge(18);
studentEntity.setName("王二小");
studentEntity.setBook(bookEntity);
return studentEntity;
}
}

@Path("/User")
public class UserResource
{
@GET
@Path("/")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response query(){
StudentEntity studentEntity = new StudentEntity();
BookEntity bookEntity = new BookEntity();
bookEntity.setId((long) 12321);
bookEntity.setAge(18);
bookEntity.setName("王二小");
studentEntity.setId((long) 12321);
studentEntity.setAge(18);
studentEntity.setName("王二小");
studentEntity.setBook(bookEntity);
return ResponseBuilder.buildSuccessResponse(studentEntity);
}
}
然后是自定义response
public class BaseResponse implements Serializable{

private static final long serialVersionUID = 8647598317829542864L;

private Boolean success = true; 

private String message; 

private Object result;

private PagerResultInfo result_info;

public Boolean getSuccess() {
    return success;
}
public void setSuccess(Boolean success) {
    this.success = success;
}
public String getMessage() {
    return message;
}
public void setMessage(String message) {
    this.message = message;
}
public Object getResult() {
    return result;
}
public void setResult(Object result) {
    this.result = result;
}
public PagerResultInfo getResult_info() {
    return result_info;
}
public void setResult_info(PagerResultInfo result_info) {
    this.result_info = result_info;
}

}
public class ResponseBuilder {
public static Response buildSuccessResponse(Object obj) {

        if (obj instanceof Pager) { return buildPager((Pager) obj); }

        BaseResponse response = new BaseResponse();

        response.setSuccess(Boolean.valueOf(true));

        response.setMessage("操作成功！");

        response.setResult(obj);

        return Response.status(Response.Status.OK).entity(response).build();
    }

}

http://blog.csdn.net/a19881029/article/details/43205457

前端对象转一下不行吗