使用JAXBContext 設(shè)置xml節(jié)點(diǎn)屬性

更新時(shí)間：2021年08月10日 10:35:32 作者：Dawn_Bells

這篇文章主要介紹了使用JAXBContext 設(shè)置xml節(jié)點(diǎn)屬性的操作，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

JAXBContext 設(shè)置xml節(jié)點(diǎn)屬性

在使用JAXBContext將javaBean轉(zhuǎn)化為xml時(shí)

會(huì)出現(xiàn)這樣的需求：

<xml version="2.0">
    ....
</xml>

那么xml節(jié)點(diǎn)里的屬性值version需要怎么設(shè)置

使用@XmlAttribute標(biāo)簽即可，如下代碼。

@XmlRootElement(name = "Xml")
@XmlAccessorType(XmlAccessType.FIELD)
public class RequestBean{
 
    @XmlAttribute(name = "version") //設(shè)置節(jié)點(diǎn)屬性
    private String version; 
    private Body body;         
    @XmlElement(name = "sign")  //設(shè)置子節(jié)點(diǎn)
    private String sign; 
    //省略封裝
}
 
@XmlRootElement(name = "Body")
@XmlAccessorType(XmlAccessType.FIELD)
public class Body{
    ...
}

最終得到的xml文件大致為：

<Xml version="2.0">
    <sign>111111</sign>
    <Body>
 <Amount>111</Amount>
 <Fee>fee</Fee>
 <PayerName>payname</PayerName>
 <AccountType>accountType</AccountType>
    </Body>
</Xml>

JAXBContext解析XML集合對(duì)象

@XmlElementWrapper 為數(shù)組元素或集合元素定義一個(gè)父節(jié)點(diǎn)。

如，類中有一元素為L(zhǎng)ist items，若不加此注解，該元素將被映射為

    <items>...</items>
    <items>...</items>

這種形式，此注解可將這個(gè)元素進(jìn)行包裝，如：

    @XmlElementWrapper(name="items")
    @XmlElement(name="item")
    public List items;

將會(huì)生成這樣的XML樣式：

    <items>
        <item>...</item>
        <item>...</item>
    </items>

Demo如下：

實(shí)體類一(定義一個(gè)被包含的子項(xiàng)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;
 } 
}

實(shí)體類二(定義一個(gè)有List集合的實(shí)體類)：

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;
 }  
}

測(cè)試方法：

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();
  }
 }
 
}

輸出：

<?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>

以上為個(gè)人經(jīng)驗(yàn)，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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