無法使用XStream將屬性綁定到對象Java lib

Question

我在將xStream解析爲xml到對象時遇到問題。操作的屬性值從不設置爲我的ImportItem對象中的字段操作。對於包含屬性的其他元素，我使用自定義轉換器，但我不希望爲用戶使用客戶轉換器。這是可能的，我該怎麼做才能將操作綁定到Item對象？

XML：

<persons> 
    <person operation="insert"> 
     <personNumber>196211065104</personNumber> 
     <startDate>2011-04-13T00:00:00.000+02:00</startDate 
     <expireDate>2012-04-14T00:00:00.000+02:00</expireDate 
     <orderDate>2011-04-12T00:00:00.000+02:00</orderDate> 
     <contact type="name">Joe</name> 
     <contact type="email">test@test.com</contact> 
     <contact type="landLine">12345678</contact> 
    </person> 
</persons> 

我廠是這樣的：

public class XStreamFactory { 
    public static XStream instace() { 
     XStream xs = new XStream(); 
     xs.aliasType("person", ImportItem.class); 
     xs.useAttributeFor(ImportItem.class, "operation"); <------- 
     xs.aliasType("persons", ImportBatch.class); 
     xs.aliasType("contact", ImportContactData.class); 


     xs.registerConverter(new ImportContactConverter()); 
     xs.registerConverter(new DateConverter()); 
     xs.registerConverter(new ImportOperationConverter()); <------- 

     xs.addImplicitCollection(ImportBatch.class, "items"); 
     xs.addImplicitCollection(ImportItem.class, "contactData", ImportContactData.class); 

     return xs; 
    } 

} 

批次：

@SuppressWarnings({"UnusedDeclaration"}) 
public class ImportBatch { 

    private List<ImportItem> items; 

    public List<ImportItem> getItems() { 
     return items; 
    } 

    @Override 
    public String toString() { 
     return "ImportBatch{" + 
       "items=\n " + StringUtils.join(items, "\n ") + 
       "\n}"; 
    } 
} 

ImportItem：

@SuppressWarnings({"UnusedDeclaration"}) 
public class ImportItem { 

    private ImportOperation operation; 
    private String personNumber; 
    private Date startDate; 
    private Date expireDate; 
    private Date orderDate; 
    private List<ImportContactData> contactData; 

    public ImportOperation getOperation() { 
     return operation; 
    } 

    public void setOperation(ImportOperation operation) { 
     this.operation = operation; 
    } 

    public String getCompanyName() { 
     return companyName; 
    } 

    public String getOrganisationNumber() { 
     return organisationNumber; 
    } 

    public String getItescoID() { 
     return itescoID; 
    } 

    public String getAdID() { 
     return adID; 
    } 

    public Date getStartDate() { 
     return startDate; 
    } 

    public Date getExpireDate() { 
     return expireDate; 
    } 

    public String getContactEmail() { 
     return contactDataFor(email); 
    } 

    public String getContactPerson() { 
     return contactDataFor(businessPerson); 
    } 

    public String getContactPhone() { 
     return contactDataFor(landLine); 
    }   
} 

新ImportOperation代碼：< ------

public class ImportOperation { 

    public enum OperationType{insert, update, delete} 

    private OperationType operation; 

    public ImportOperation(OperationType operation) { 
     this.operation = operation; 
    } 

    public OperationType getOperation() { 
     return operation; 
    } 

    public void setOperation(OperationType operation) { 
     this.operation = operation; 
    } 


} 

新的轉換代碼：< ------

public class ImportOperationConverter implements SingleValueConverter { 

    public String toString(Object obj) { 
     return ((ImportOperation)obj).getOperation().toString(); 
    } 

    public Object fromString(String str) { 
     return new ImportOperation(ImportOperation.OperationType.valueOf(str)); 
    } 

    public boolean canConvert(Class clazz) { 
     return clazz == ImportOperation.class; 
    } 
} 

Answer 1

你需要告訴XStream的是，現場操作是一個XML屬性。

添加

xs.useAttributeFor(ImportItem.class, "operation"); 

@see XStream Alias Tutorial

的原因是，XStream的地圖默認一切XML領域。如果你解組一個對象，並且一個Object字段沒有在XML中定義，那麼默認情況下，XStream會將它設置爲NULL。 - 將這兩部分放在一起解釋行爲，並告訴你該怎麼做。 - >配置映射，以便將Person.operation映射到該屬性。