Question

我有一个'Order'类，其中包含类'Triplet'的对象列表。当我尝试以xml格式获取订单对象时，我会正确地获取所有其他数据。以下是代码段：

Order.java：

@XmlRootElement
public class Order {
    private String orderid;
    private String orderStatus;
    private String paidStatus;
    private String address;
    private double total;
    private String emailid;
    private String username;
    private List<Triplet> movies=new ArrayList<>();
    public Order(String orderid, String orderStatus, String paidStatus,      String address, double total, String emailid,
        String username) {
    super();
    this.orderid = orderid;
    this.orderStatus = orderStatus;
    this.paidStatus = paidStatus;
    this.address = address;
    this.total = total;
    this.emailid = emailid;
    this.username = username;
}

public Order(String orderid, String orderStatus, String paidStatus, String address, double total, String emailid,
        String username, List<Triplet> movies) {
    super();
    this.orderid = orderid;
    this.orderStatus = orderStatus;
    this.paidStatus = paidStatus;
    this.address = address;
    this.total = total;
    this.emailid = emailid;
    this.username = username;
    this.movies = movies;
}


    public Order() {
    super();
}
 //getters and setters
public String getOrderid() {
    return orderid;
}
public void setOrderid(String orderid) {
    this.orderid = orderid;
}
public String getOrderStatus() {
    return orderStatus;
}
public void setOrderStatus(String orderStatus) {
    this.orderStatus = orderStatus;
}
public String getPaidStatus() {
    return paidStatus;
}
public void setPaidStatus(String paidStatus) {
    this.paidStatus = paidStatus;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public double getTotal() {
    return total;
}
public void setTotal(double total) {
    this.total = total;
}
public String getEmailid() {
    return emailid;
}
public void setEmailid(String emailid) {
    this.emailid = emailid;
}
public String getUsername() {
    return username;
}
public void setUsername(String username) {
    this.username = username;
}
public List<Triplet> getMovies() {
    return movies;
}
public void setMovies(List<Triplet> movies) {
    this.movies = movies;
}
    public Order getObject(){
        Order o=new Order();
        o.setAddress("address1");
        o.setEmailid("email");
        o.setOrderid("orderid");
        o.setOrderStatus("in process");
        o.setPaidStatus("n");
        o.setTotal(250.5);
        o.setUsername("admin");
        movies.add(new Triplet(1L,2,200.0));
        movies.add(new Triplet(2L,3,150.0));
        o.setMovies(movies);
        return o;
    }
}

Triplet.java：

@XmlRootElement
public class Triplet implements Serializable {

 private long movieid;
    private int quantity;
    private double price;



    public Triplet() {
        super();
    }

    public Triplet(long movieid, int quantity, double price) {
        this.movieid = movieid;
        this.quantity = quantity;
        this.price = price;
    }

    public long getMovieid() { return movieid; }
    public int getQuantity() { return quantity; }
    public double getPrice() { return price; }
}

OrderResource.java：

@Path("/orders")
public class OrderResource {
OrderService os=new OrderService();

@GET
@Produces(MediaType.APPLICATION_XML)
@Path("/{emailid}")
public Order getOrderByCustomer(@PathParam("emailid") String emailid){
    Order o=new Order();
    return o.getObject();
}
}

输出：

<order>
<address>address1</address>
<emailid>email</emailid>
<movies/>
<movies/>
<orderStatus>in process</orderStatus>
<orderid>orderid</orderid>
<paidStatus>n</paidStatus>
<total>250.5</total>
<username>admin</username>
</order>

如何在电影中获得正确的价值？

修改

问题是Order对象中的Triplet类对象列表没有转换为XML。

要解决此问题，请在Triplet类中添加注释 - @XmlAccessorType（XmlAccessType.FIELD），如dsp_user给出的答案的EDIT部分所述。

Answer 1

将movies.add更改为o.movies.add。您正在修改由list引用保留的movies this，而在getObject方法中，您将同时返回另一个实例。

Answer 2

您未在＆lt; movies＆gt;中获取任何值因为Order类没有movie属性/字段的getter。将您的Order类更改为

@XmlRootElement
public class Order {
...
 @XmlElement
private List<Triplet> movies;

public List<Triplet> getMovies(){
  if(movies == null)
     movies = new ArrayList<Triplet>();

  return movies;
}
 ....
   //The setter for  movies isn't necessary because you can add new movies 
   //by calling getMovies().add(new Movie(1L,2,300.0));

}

我没有尝试过您的数据，但我过去做过类似的事情，所以我知道它应该有效。

编辑：我现在已经尝试过你的代码了，如果你只是在Triplet类中添加一个注释就可以了。

 @XmlAccessorType(XmlAccessType.FIELD)
 public class Triplet  {
 ...
 }

我测试了这段代码（注释和未注释）

 final String ORDER_XML = "C:\\test\\Order.xml";

    JAXBContext context = JAXBContext.newInstance(Order.class);
    Marshaller m = context.createMarshaller();

    m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

    Order o = new Order();

   /* o.setAddress("address1");
    o.setEmailid("email");
    o.setOrderid("orderid");
    o.setOrderStatus("in process");
    o.setPaidStatus("n");
    o.setTotal(250.5);
    o.setUsername("admin");

    o.getMovies().add(new Triplet(1L,2,200.0));
    o.getMovies().add(new Triplet(2L,3,150.0));
    o.getMovies().add(new Triplet(3L,3,400.0));*/
    //o.setMovies(movies);
    m.marshal(o.getObject(), new File(ORDER_XML));

生成的XML

    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<order>
    <address>address1</address>
    <emailid>email</emailid>
    <movies>
        <movieid>1</movieid>
        <quantity>2</quantity>
        <price>200.0</price>
    </movies>
    <movies>
        <movieid>2</movieid>
        <quantity>3</quantity>
        <price>150.0</price>
    </movies>
    <orderStatus>in process</orderStatus>
    <orderid>orderid</orderid>
    <paidStatus>n</paidStatus>
    <total>250.5</total>
    <username>admin</username>
</order>

列表中的对象未转换为XML

2 个答案: