无法解组使用JAXB Java的一个xml，而无需使用任何annotation-没有错误，但解组是不正确

Question

我试图XML内容转换为使用JAXB 一个Java对象，而无需使用任何注释。我的XML文件（CustomerDtl.xml）结构如下

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<basePojo> 
<customerId>C001</customerId> 
<customerList> 
    <Customer> 
     <name>Ram</name> 
     <phoneNo>123445</phoneNo> 
    </Customer> 

    <Customer> 
     <name>Tom</name> 
     <phoneNo>2332322</phoneNo> 
    </Customer> 
</customerList> 
</basePojo> 

提到的和我的POJO是

BasePojo.java

package pojo; 

import java.util.List; 

import pojo.Customer; 

public class BasePojo { 

    List<Customer> customerList; 
    String customerId; 

    public List<Customer> getCustomerList() { 
     return customerList; 
    } 

    public void setCustomerList(List<Customer> customerList) { 
     this.customerList = customerList; 
    } 

    public String getCustomerId() { 
     return customerId; 
    } 

    public void setCustomerId(String customerId) { 
     this.customerId = customerId; 
    } 

} 

Customer.java

package pojo; 

public class Customer { 

    private String name; 

    private String phoneNo; 

public String getName() { 
    return name; 
} 

public void setName(String name) { 
    this.name = name; 
} 

public String getPhoneNo() { 
    return phoneNo; 
} 

public void setPhoneNo(String phoneNo) { 
    this.phoneNo = phoneNo; 
} 

} 

下文提到的一段代码，我已经写XML内容转换成Java对象

try { 

     JAXBContext jc = JAXBContext.newInstance(BasePojo.class); 
     StreamSource xml = new StreamSource("CustomerDtl.xml"); 
     Unmarshaller unmarshaller = jc.createUnmarshaller(); 
     JAXBElement<BasePojo> jaxbElementObject = unmarshaller.unmarshal(
       xml, BasePojo.class); 
     BasePojo bPojo = jaxbElementObject.getValue(); 

     System.out.println("id="+bPojo.getCustomerId()); 
     System.out.println("list size="+bPojo.getCustomerList().size()); 

     Iterator iterator = bPojo.getCustomerList().iterator(); 
     while (iterator.hasNext()) { 
      Customer studentDetails = (Customer) iterator.next(); 
      System.out.println("Print Name:" + studentDetails.getName()); 
     } 

    } catch (JAXBException e) { 
     System.out.println("Exception:" + e); 
    } 

和OUT把这个代码是

id=C001 
list size=1 
list size=[pojo.Customer@3e3abc88] 
Print Customer Name:null 

后执行这个程序是打印正确的customerId，但它打印错误的客户名单大小。尽管列表大小为1，并且列表包含Customer对象，但是当我遍历列表并尝试获取Customer的不同属性值时，我变为null。

任何人都可以解释我需要纠正什么吗？使用注释我试过了，它按预期工作。没有注释是不可能的？

Answer 1

在xml中，您不必指定类名称（Customer）作为您的列表的子项（customerList），只需使用列表名称直接为每个元素。

所以，改变这样的XML：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<basePojo> 
<customerId>C001</customerId> 

<customerList> 
    <name>Ram</name> 
    <phoneNo>123445</phoneNo> 
</customerList> 

<customerList> 
    <name>Tom</name> 
    <phoneNo>2332322</phoneNo> 
</customerList> 

</basePojo> 

Answer 2

尝试类似下面

 

     try { 
      XMLInputFactory xif = XMLInputFactory.newFactory(); 
      StreamSource xml = new StreamSource("CustomerDtl.xml"); 
      XMLStreamReader xsr = xif.createXMLStreamReader(xml); 
      while(xsr.hasNext()) { 
       if(xsr.isStartElement() && "Customer".equals(xsr.getLocalName())) { 
        break; 
       } 
       xsr.next(); 
      } 
      JAXBContext jc = JAXBContext.newInstance(Customer.class); 
      Unmarshaller unmarshaller = jc.createUnmarshaller(); 
      Customer customer = unmarshaller.unmarshal(xsr, Customer.class).getValue(); 
      System.out.println(customer.getName()); 

     } catch (JAXBException e) { 
      System.out.println("Exception:" + e); 
     } 

Answer 3

在这里你去，如果你不希望任何注释（与您共享的确切XML）。

1）包装你列表的包装类（处理customerList）

2）现在，当我问评论，如果您有“客户”元素，则默认公认的“XML”的名字将与小C。如果你不想对此进行注释，那么在阅读时应该对其进行处理。

说了这么这里之后是工作示例（带可运行主）修改您的BasePojo

package pojo; 

import java.io.ByteArrayInputStream; 
import java.io.StringReader; 
import java.util.Iterator; 
import java.util.List; 

import javax.xml.bind.JAXBContext; 
import javax.xml.bind.JAXBElement; 
import javax.xml.bind.Unmarshaller; 
import javax.xml.stream.XMLInputFactory; 
import javax.xml.stream.XMLStreamReader; 
import javax.xml.stream.util.StreamReaderDelegate; 
import javax.xml.transform.stream.StreamSource; 

public class BasePojo { 

    String customerId; 
    CustomerList customerList; 

    public CustomerList getCustomerList() { 
     return customerList; 
    } 

    public void setCustomerList(CustomerList customerListObject) { 
     this.customerList = customerListObject; 
    } 

    public String getCustomerId() { 
     return customerId; 
    } 

    public void setCustomerId(String customerId) { 
     this.customerId = customerId; 
    } 

    public static void main(String[] args) { 
     try { 
      String customerData = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n" 
        + "<basePojo>\n" 
        + "<customerId>C001</customerId>\n" 
        + "<customerList>\n" 
        + " <Customer>\n" 
        + "  <name>Ram</name>\n" 
        + "  <phoneNo>123445</phoneNo>\n" 
        + " </Customer>\n" 
        + "\n" 
        + " <Customer>\n" 
        + "  <name>Tom</name>\n" 
        + "  <phoneNo>2332322</phoneNo>\n" 
        + " </Customer>\n" 
        + "</customerList>\n" 
        + "</basePojo>"; 
      JAXBContext jc = JAXBContext.newInstance(BasePojo.class); 
      StringReader reader = new StringReader(customerData); 
      StreamSource xml = new StreamSource(reader); 
      XMLInputFactory xif = XMLInputFactory.newFactory(); 
      XMLStreamReader xsr = xif.createXMLStreamReader(new ByteArrayInputStream(customerData.getBytes("UTF-8"))); 
      xsr = new StreamReaderDelegate(xsr) { 
       @Override 
       public String getLocalName() { 
        String localName = super.getLocalName(); 

        if ("Customer".equals(localName)) { 
         return "customer"; 
        } 
        return localName; 
       } 

      }; 

      Unmarshaller unmarshaller = jc.createUnmarshaller(); 
      JAXBElement<BasePojo> jaxbElementObject = unmarshaller.unmarshal(xsr, BasePojo.class); 
      BasePojo bPojo = jaxbElementObject.getValue(); 

      System.out.println("id=" + bPojo.getCustomerId()); 
      System.out.println("list size=" + bPojo.getCustomerList().getCustomer().size()); 

      Iterator iterator = bPojo.getCustomerList().getCustomer().iterator(); 
      while (iterator.hasNext()) { 
       Customer studentDetails = (Customer) iterator.next(); 
       System.out.println("Print Name:" + studentDetails.getName()); 
      } 

     } catch (Exception e) { 
      System.out.println("Exception:" + e); 
     } 

    } 
} 

class CustomerList { 

    private List<Customer> customer; 

    public List<Customer> getCustomer() { 
     return customer; 
    } 

    public void setCustomer(List<Customer> customer) { 
     this.customer = customer; 
    } 

}