JAXBContext解析XML集合对象

淡淡的烟草味﹌ 2021-06-24 14:00 439阅读 0赞

@XmlElementWrapper  为数组元素或集合元素定义一个父节点。  
如，类中有一元素为List items，若不加此注解，该元素将被映射为  
    <items>...</items>  
    <items>...</items>  
这种形式，此注解可将这个元素进行包装，如：  
    @XmlElementWrapper(name="items")  
    @XmlElement(name="item")  
    public List items;  
将会生成这样的XML样式：  
    <items>  
        <item>...</item>  
        <item>...</item>

</items>

Demo如下:

实体类一(定义一个被包含的子项Item):

package org.ywzn.po;
    
    import javax.xml.bind.annotation.XmlAttribute;
    
    public class Item {
    
    	private String infoType;
    
    	private String nodeId;
    
    	private String resultCode;
    
    	private String resultString;
    
    	public Item() {
    		super();
    	}
    
    	public Item(String infoType, String nodeId, String resultCode,
    			String resultString) {
    		super();
    		this.infoType = infoType;
    		this.nodeId = nodeId;
    		this.resultCode = resultCode;
    		this.resultString = resultString;
    	}
    
    	@XmlAttribute(name = "InfoType")
    	public String getInfoType() {
    		return infoType;
    	}
    
    	public void setInfoType(String infoType) {
    		this.infoType = infoType;
    	}
    
    	public String getNodeId() {
    		return nodeId;
    	}
    
    	public void setNodeId(String nodeId) {
    		this.nodeId = nodeId;
    	}
    
    	public String getResultCode() {
    		return resultCode;
    	}
    
    	public void setResultCode(String resultCode) {
    		this.resultCode = resultCode;
    	}
    
    	public String getResultString() {
    		return resultString;
    	}
    
    	public void setResultString(String resultString) {
    		this.resultString = resultString;
    	}
    
    }

实体类二(定义一个有List集合的实体类):

package org.ywzn.po;
    
    import java.util.List;
    
    import javax.xml.bind.annotation.XmlAttribute;
    import javax.xml.bind.annotation.XmlElement;
    import javax.xml.bind.annotation.XmlElementWrapper;
    import javax.xml.bind.annotation.XmlRootElement;
    
    @XmlRootElement
    public class Message {
    
    	private String version;
    	
    	private Head head;
    	
    	private List<Item> items;
    
    	@XmlAttribute(name="version")
    	public String getVersion() {
    		return version;
    	}
    
    	public void setVersion(String version) {
    		this.version = version;
    	}
    
    	@XmlElement(name="Head")
    	public Head getHead() {
    		return head;
    	}
    
    	public void setHead(Head head) {
    		this.head = head;
    	}
    
    	public List<Item> getItems() {
    		return items;
    	}
    
    	@XmlElementWrapper(name="Items")
    	@XmlElement(name="Item")
    	public void setItems(List<Item> items) {
    		this.items = items;
    	}
    
    
    }

测试方法:

package org.ywzn.main;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import javax.xml.bind.JAXBContext;
    import javax.xml.bind.JAXBException;
    import javax.xml.bind.Marshaller;
    
    import org.ywzn.po.Head;
    import org.ywzn.po.Item;
    import org.ywzn.po.Message;
    import org.ywzn.po.Parameters;
    import org.ywzn.po.Room;
    
    public class Java2XMLMany {
    
    	public static void main(String[] args) {
    		// <?xml version='1.0' encoding='UTF-8' standalone='no' ?> <Message
    		// version='1.0'><Header Time='2015-05-22 10:34:27' MessageType='LOGIN'
    		// BusinessId='B730EB39-CEFF-4a38-B633-D8936EB8AEF7' SessionId='936'
    		// /><Parameters> <items Sum='1' Offset='1' Cur='1'> <item
    		// Infotype='LogUser'> <PassWord
    		// >D41D8CD98F00B204E9800998ECF8427E</PassWord></item> </items>
    		// </Parameters> </Message>
    
    		// TODO Auto-generated method stub
    		Item item = new Item("LOGIN","789", "xxx","xxx");
    		List<Item> list = new ArrayList<Item>();
    		list.add(item);
    		Head head = new Head("2015-05-21 16:46:14", "LOGIN", "8D24CE2B-5");
    		Parameters parameters = new Parameters(list);
    		// Message message = new Message(head,"1.0",parameters);
    		Message message = new Message();
    		message.setVersion("1.0");
    		message.setHead(head);
    		message.setItems(list);
    		try {
    			JAXBContext context = JAXBContext.newInstance(Message.class);
    			Marshaller createMarshaller = context.createMarshaller();
    			createMarshaller
    					.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);// 是否格式化生成的xml串
    
    			createMarshaller.marshal(message, System.out);
    		} catch (JAXBException e) {
    			e.printStackTrace();
    		}
    	}
    
    }

输出:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <message version="1.0">
        <Head businessId="8D24CE2B-5" MessageType="LOGIN" Time="2015-05-21 16:46:14"/>
        <Items>
            <Item InfoType="LOGIN">
                <nodeId>789</nodeId>
                <resultCode>xxx</resultCode>
                <resultString>xxx</resultString>
            </Item>
        </Items>
    </message>