将xml dom解析为对象

Question

如何用这样的对象填充数组?

class Sam{
String id;
String type;
String data;
}

from XML structure:

<Table name="Sam">
<Row id="374058">
<Col name="ID.1">374058</Col>
<Col name="TYPE.1">mob</Col>
</Row>
<Row id="374059">
<Col name="ID.1">374059</Col>
<Col name="TYPE.1">ff</Col>
</Row>
</Table>

找到这样的"表"但是接下来我应该怎么做才能从"行"中收集数据呢?

List<Sam> samList = new new ArrayList<>();
NodeList nameNodeList = xml.getDocumentElement().getElementsByTagName("Table");
if (nameNodeList != null) {
for (int i = 0; i < nameNodeList.getLength(); i++) {
Node node = nameNodeList.item(i);
if (node.getAttributes().getNamedItem("name").getNodeValue().equals("Sam") &&
node.getNodeType() == Node.ELEMENT_NODE) {
Element element = (Element) node;
//what should i do next, how can i fined ID,TYPE,DATA?
}
}
}

Answer 1

试试这个。我尝试对问题进行编码，并得到以下输出。这段代码解析XML并构造Sam对象。

代码:

import java.util.ArrayList;
import java.util.List;
import org.w3c.dom.NodeList;
import org.w3c.dom.*;
import javax.xml.parsers.*;
import java.io.*;
public class XmlParse {
public static void main(String[] args) {
XmlParse xmlParse = new XmlParse();
xmlParse.xmlToObj();
}
public void xmlToObj() {
try {

File inputFile = new File("sam.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(inputFile);
doc.getDocumentElement().normalize();
System.out.println("Root element: " + doc.getDocumentElement().getNodeName());
NodeList nodeList = doc.getElementsByTagName("Row");

Node node = null;
List<Sam> samList = new ArrayList<>();
if(nodeList != null && nodeList.getLength() > 0) {
for(int i=0; i < nodeList.getLength(); i++) {
node = nodeList.item(i);
NodeList innerNodeList =  doc.getElementsByTagName("Col");

Node innerNodeID = innerNodeList.item(0);
Node innerNodeType = innerNodeList.item(1);

String id =  innerNodeID.getTextContent();
String type = innerNodeType.getTextContent();
Sam sam = new Sam(id, type, null);
System.out.println(sam.toString());

samList.add(sam);
}

}

} catch (Exception ex) {
ex.printStackTrace();
}
}
}
class Sam {
String id;
String type;
String data;
public Sam(String id, String type, String data) {
this.id = id;
this.type = type;
this.data = data;
}
@Override
public String toString() {
return "Sam [id=" + id + ", type=" + type + ", data=" + data + "]";
}

}

输出:

Root element: Table
Sam [id=374058, type=mob, data=null]
Sam [id=374058, type=mob, data=null]

input: sam.xml

<Table name="Sam">
<Row id="374058">
<Col name="ID">374058</Col>
<Col name="TYPE">mob</Col>
</Row>
<Row id="374059">
<Col name="ID">374059</Col>
<Col name="TYPE">ff</Col>
</Row>
</Table>

Answer 2

您可以使用JAXB反编组

您还可以在JAXB解组示例

中看到一些示例。