使用DOM解析器解析XML困难
[英]Difficulty in parsing xml using DOM Parser
问题描述
如何获取嵌套在下面分组标签下的name标签的值。 我能够获取嵌套在列标记下的名称的值。 如何获取分组标签下的名称的嵌套值。分组标签下的名称标签的属性不同。
<Services>
<Service name="check" regrx="" reverseExtention="" >
<File rootProfile="Test" extension="txt" seperator="," targetSeperator="q12">
<Columns>
<name id="1" usn="2234" dob="030395" age="55" validity="20" />
<name id="2" usn="I_TWO" dob="true" age="10" validity="44" >
<grouped>
<name id="343" value1="TYPE0" value2="TYPE4" type="" value7="1"></name>
<name id="564" value1="TYPE6" value2="TYPE7" type="" value7="0"></name>
</grouped>
</name>
<name id="3" usn="55453" dob="050584" age="35" validity="123"/>
<name id="5" usn="7565" dob="050488" age="44" validity="55"/>
</Columns>
</File>
</Service>
</Services>
这是我的下面的代码
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
try{
File fXmlFile = new File("D://test3.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nodeList0 = doc.getElementsByTagName("Service");
NodeList nodeList1 = doc.getElementsByTagName("File");
NodeList nodeList2 = doc.getElementsByTagName("name");
NodeList nodeList3= doc.getElementsByTagName("grouped");
System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
for (int temp0 = 0; temp0 < nodeList0.getLength(); temp0++) {
Node node0 = nodeList0.item(temp0);
System.out.println("\nElement type :" + node0.getNodeName());
Element Service = (Element) node0;
System.out.println("----" + temp0 + "-------");
if (node0.getNodeType() == Node.ELEMENT_NODE) {
System.out.println("Name : " + Service.getAttribute("name"));
System.out.println("regrx : " + Service.getAttribute("regrx"));
System.out.println("reverex"+Service.getAttribute("reverseExtention"));
for (int temp = 0; temp < nodeList1.getLength(); temp++) {
Node node1 = nodeList1.item(temp);
System.out.println("------file" + temp + "--------");
System.out.println("\nElement type :" + node1.getNodeName());
Element File = (Element) node1;
//used for getting file level
if (node1.getNodeType() == Node.ELEMENT_NODE) {
System.out.println("rootProfile:" + File.getAttribute("rootProfile"));
System.out.println("extension : " + File.getAttribute("extension"));
System.out.println("seperator : " + File.getAttribute("seperator"));
System.out.println("targetSeperator : " + File.getAttribute("targetSeperator"));
for(int temp2=0;temp2<nodeList2.getLength();temp2++){
Node node2 = nodeList2.item(temp2);
Element name = (Element) node2;
if (node2.getNodeType() == Node.ELEMENT_NODE) {
System.out.println("id:" + name.getAttribute("id"));
System.out.println("usn : " + name.getAttribute("usn"));
System.out.println("dob : " + name.getAttribute("dob"));
System.out.println("age : " + name.getAttribute("age"));
System.out.println("validity : " + name.getAttribute("validity"));
//to get grouped node, the problem seems to be here
Node node3=nodeList3.item(temp2);
if(node3.hasChildNodes()){
Element grouped=(Element)node3;
if(node3.getNodeType()==Node.ELEMENT_NODE){
System.out.println("id:" + grouped.getAttribute("id"));
System.out.println("value1:" + grouped.getAttribute("value1"));
System.out.println("value2:" + grouped.getAttribute("value2"));
System.out.println("type:" + grouped.getAttribute("type"));
System.out.println("value7:" + grouped.getAttribute("value7"));
}
}
}
}
}
}
}
}
}
catch(Exception e){
e.printStackTrace();
}
}
}
2 个解决方案
解决方案1
0 2014-10-08 06:31:30
如果需要在grouped下的嵌套 name标签，请从grouped标签而不是从文档中询问元素。
Document.getElementsByTagName()为您提供该名称的所有标签，在Element上调用getElementsByTagName()将为您提供Elemenent所有后代元素（例如，子代，孙代等）。
您可以安全地将grouped Node为Element并在其上调用getElementsByTagName() ：
NodeList groupedNodeList = doc.getElementsByTagName("grouped");
for (int i = 0; i < groupedNodeList .getLength(); i++) {
Element groupedElement = (Element) groupedNodeList .item(i);
NodeList nameList = groupedElement.getElementsByTagName("name");
// Here you go, you have the list of name tags UNDER grouped
// Printing the id and value attributes of the name tag:
for (int j = 0; j < nameList.getLength(); j++) {
Element name = (Element) nameList.item(j);
System.out.println("Found <name>: id=" + name.getAttribute("id"));
System.out.println("\tvalue1=" + name.getAttribute("value1"));
System.out.println("\tvalue2=" + name.getAttribute("value2"));
System.out.println("\tvalue7=" + name.getAttribute("value7"));
}
}
输出为：
Found <name>: id=343
value1=TYPE0
value2=TYPE4
value7=1
Found <name>: id=564
value1=TYPE6
value2=TYPE7
value7=0
解决方案2
0 已采纳 2014-10-08 06:50:20
下面是修改后的代码
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class Test {
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
File fXmlFile = new File("D://test3.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory
.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
doc.getDocumentElement().normalize();
NodeList nodeList0 = doc.getElementsByTagName("Service");
NodeList nodeList1 = doc.getElementsByTagName("File");
NodeList nodeList2 = doc.getElementsByTagName("name");
NodeList nodeList3 = doc.getElementsByTagName("grouped");
System.out.println("Root element :"
+ doc.getDocumentElement().getNodeName());
for (int temp0 = 0; temp0 < nodeList0.getLength(); temp0++) {
Node node0 = nodeList0.item(temp0);
System.out.println("\nElement type :" + node0.getNodeName());
Element Service = (Element) node0;
System.out.println("----" + temp0 + "-------");
if (node0.getNodeType() == Node.ELEMENT_NODE) {
System.out
.println("Name : " + Service.getAttribute("name"));
System.out.println("regrx : "
+ Service.getAttribute("regrx"));
System.out.println("reverex"
+ Service.getAttribute("reverseExtention"));
for (int temp = 0; temp < nodeList1.getLength(); temp++) {
Node node1 = nodeList1.item(temp);
System.out.println("------file" + temp + "--------");
System.out.println("\nElement type :"
+ node1.getNodeName());
Element File = (Element) node1;
// used for getting file level
if (node1.getNodeType() == Node.ELEMENT_NODE) {
System.out.println("rootProfile:"
+ File.getAttribute("rootProfile"));
System.out.println("extension : "
+ File.getAttribute("extension"));
System.out.println("seperator : "
+ File.getAttribute("seperator"));
System.out.println("targetSeperator : "
+ File.getAttribute("targetSeperator"));
for (int temp2 = 0; temp2 < nodeList2.getLength(); temp2++) {
Node node2 = nodeList2.item(temp2);
Element name = (Element) node2;
if (node2.getNodeType() == Node.ELEMENT_NODE) {
System.out.println("id:"
+ name.getAttribute("id"));
System.out.println("usn : "
+ name.getAttribute("usn"));
System.out.println("dob : "
+ name.getAttribute("dob"));
System.out.println("age : "
+ name.getAttribute("age"));
System.out.println("validity : "
+ name.getAttribute("validity"));
// to get grouped node, the problem seems to
// be here
// Node node3 = nodeList3.item(temp2);
NodeList grouped = node2.getChildNodes();
if (grouped != null
&& grouped.getLength() > 0) {
for (int ii = 0; ii < grouped
.getLength(); ii++) {
Node group = grouped.item(ii);
{
NodeList gropedNames = group
.getChildNodes();
if (gropedNames != null
&& gropedNames
.getLength() > 0) {
for (int jj = 0; jj < gropedNames
.getLength(); jj++) {
if (gropedNames
.item(jj) != null
&& gropedNames
.item(jj)
.getAttributes() != null) {
System.out
.println(gropedNames
.item(jj)
.getAttributes()
.getNamedItem(
"id"));
System.out
.println(gropedNames
.item(jj)
.getAttributes()
.getNamedItem(
"value1"));
System.out
.println(gropedNames
.item(jj)
.getAttributes()
.getNamedItem(
"value2"));
System.out
.println(gropedNames
.item(jj)
.getAttributes()
.getNamedItem(
"value7"));
}
}
}
}
}
}
}
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
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