POPTEST老李分享DOM解析XML之java
Java提供了两种XML解析器:树型解释器DOM(Document Object Model,文档对象模型),和流机制解析器SAX(Simple API for XML,XML简单API)。DOM可以将XML转换为树结构。
XML文档内容如下:
文件名:NameList.xml,文件路径:C:UsersTsybiusDesktopNameList.xml
<?
xml
version
=
"1.0"
encoding
=
"UTF-8"
?>
<
root
>
<
list1
>
<
person
id
=
"101"
name
=
"Tsybius"
remark
=
"1"
/>
<
person
id
=
"102"
name
=
"Galatea"
remark
=
"2"
/>
<
person
id
=
"103"
name
=
"Quintus"
remark
=
"3"
/>
<
person
id
=
"104"
name
=
"Atia"
remark
=
"4"
/>
<
person
id
=
"105"
name
=
"Justitia"
remark
=
"5"
/>
</
list1
>
<
list2
>
<
person
id
=
"201"
name
=
"Zhang"
remark
=
"a"
/>
<
person
id
=
"202"
name
=
"Wang"
remark
=
"b"
/>
<
person
id
=
"203"
name
=
"Li"
remark
=
"c"
/>
<
person
id
=
"204"
name
=
"Zhao"
remark
=
"d"
/>
<
person
id
=
"205"
name
=
"Liu"
remark
=
"e"
/>
</
list2
>
<
text
>TEXT</
text
>
</
root
>
Java代码如下:
package
XmlDomTest;
import
java.io.File;
import
java.io.IOException;
import
javax.xml.parsers.DocumentBuilder;
import
javax.xml.parsers.DocumentBuilderFactory;
import
javax.xml.parsers.ParserConfigurationException;
import
org.w3c.dom.Document;
import
org.w3c.dom.Element;
import
org.w3c.dom.NamedNodeMap;
import
org.w3c.dom.Node;
import
org.w3c.dom.NodeList;
import
org.w3c.dom.Text;
import
org.xml.sax.SAXException;
/**
* 使用DOM解析XML
* @author Tsybius
*
*/
public
class
XmlDomTest {
/**
* 使用DOM解析XML
* @param args
*/
public
static
void
main(String[] args) {
try
{
String filePath =
"C:\Users\Tsybius\Desktop\NameList.xml"
;
File f =
new
File(filePath);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(f);
//遍历节点方式1
Element root = doc.getDocumentElement();
System.out.println(
"根节点名:"
+ root.getNodeName());
NodeList children = root.getChildNodes();
for
(
int
i =
0
; i < children.getLength(); i++) {
Node child = children.item(i);
if
(child
instanceof
Element) {
Element childElement = (Element)child;
System.out.println(
"节点名:"
+ childElement.getNodeName());
if
(childElement.getNodeName().equals(
"list1"
)) {
//list1
//遍历节点方式2
//获取指定属性
for
(Node list1Node = childElement.getFirstChild();
list1Node !=
null
;
list1Node = list1Node.getNextSibling()) {
if
(list1Node
instanceof
Element) {
Element list1Element = (Element)list1Node;
System.out.print(
"person:"
);
System.out.print(
"id="
+ list1Element.getAttribute(
"id"
) +
";"
);
System.out.print(
"name="
+ list1Element.getAttribute(
"name"
) +
";"
);
System.out.print(
"remark="
+ list1Element.getAttribute(
"remark"
) +
";"
);
System.out.println();
}
}
}
else
if
(childElement.getNodeName().equals(
"list2"
)) {
//list2
//遍历节点方式2
//遍历所有属性
for
(Node list2Node = childElement.getFirstChild();
list2Node !=
null
;
list2Node = list2Node.getNextSibling()) {
if
(!(list2Node
instanceof
Element)) {
continue
;
}
NamedNodeMap attributes = ((Element)list2Node).getAttributes();
System.out.print(
"person:"
);
for
(
int
counter =
0
; counter < attributes.getLength(); counter++) {
Node attribute = attributes.item(counter);
if
(attribute ==
null
) {
continue
;
}
String name = attribute.getNodeName();
String value = attribute.getNodeValue();
System.out.print(name +
"="
+ value +
";"
);
}
System.out.println();
}
}
else
if
(childElement.getNodeName().equals(
"text"
)) {
//text
//获取文本值
Text textNode = (Text)childElement.getFirstChild();
String text = textNode.getData().trim();
System.out.println(
"text:"
+ text);
}
}
}
}
catch
(ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch
(SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch
(IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch
(Exception e) {
e.printStackTrace();
}
}
}
控制台中输出结果如下:
根节点名:root 节点名:list1 person:id=101;name=Tsybius;remark=1; person:id=102;name=Galatea;remark=2; person:id=103;name=Quintus;remark=3; person:id=104;name=Atia;remark=4; person:id=105;name=Justitia;remark=5; 节点名:list2 person:id=201;name=Zhang;remark=a; person:id=202;name=Wang;remark=b; person:id=203;name=Li;remark=c; person:id=204;name=Zhao;remark=d; person:id=205;name=Liu;remark=e; 节点名:text text:TEXT