生成XML屬性而不是

Question

我使用的是@XmlRootElement批註與@XmlElement一起產生在我的Spring MVC應用程序中的XML輸出的元素。我有以下類：

@XmlRootElement 
public class Chart 
{ 
    private String id; 
    private String name; 
    private List<Connection> connections; 
    //.................. 

    @XmlElement(name = "connection") 
    public List<Connection> getConnections() 
    { 
     return this.connections; 
    } 

    //.................. 
} 

public class Connection 
{ 
    private String from; 
    private String to; 

    public String getFrom() 
    { 
     return this.from; 
    } 

    public void setFrom(String from) 
    { 
     this.from = from; 
    } 

    public String getTo() 
    { 
     return this.to; 
    } 

    public void setTo(String to) 
    { 
     this.to = to; 
    } 
} 

而且我發現了一個XML輸出是這樣的：

<chart> 
    <id>a1</id> 
    <name>chart1</name> 
    <connection> 
     <from>a1</from> 
     <to>a2</to> 
    </connection> 
    .... 
</chart> 

但是，我必須這樣格式化XML：

<chart> 
    <id>a1</id> 
    <name>chart1</name> 
    <connection from="a1" to="a2"></connection> 
    .... 
</chart> 

如何配置註釋爲了達到這樣的結果？

Answer 1

上要當作屬性Connection的特定元素使用@XmlAttribute。

public class Connection 
{ 
    private String from; 
    private String to; 

    public String getFrom() 
    { 
     return this.from; 
    } 

    @XmlAttribute 
    public void setFrom(String from) 
    { 
     this.from = from; 
    } 

    public String getTo() 
    { 
     return this.to; 
    } 

    @XmlAttribute 
    public void setTo(String to) 
    { 
     this.to = to; 
    } 
}