在xml元素中获取属性值

Question

我有一个像这样的xml字符串，我想在每个元素的循环中获取“名称”的属性值。我怎么做？我正在使用javax.xml.parsers库。<xml>    <Item type="ItemHeader" name="Plan Features" id="id_1"/>    <Item type="Deductible" name="Deductible" id="a">Calendar Year        <Item type="Text" name="Individual" id="b">200</Item>        <Item type="Text" name="Family" id="c">350</Item>    </Item>    <Item lock="|delete|" type="Empty" name="Out-of-Pocket Annual Maximum" id="id_2">        <Item type="Text" name="Individual" id="d">400</Item>        <Item type="Currency" name="Individual Out-of-Network" id="id_5">$320.00</Item>        <Item type="Text" name="Family" id="e">670</Item>    </Item>    <Item type="Text" name="Life Time Maximum" id="u">8000</Item>    <Item type="Text" name="Coinsurance" id="f">60</Item>    <Item type="Text" name="Office Visits" id="g">10</Item>    <Item type="Text" name="Routine Physicals" id="h">12</Item>    <Item type="Text" name="Preventive Care" id="m"/>    <Item type="Text" name="Physician Services" id="i"/>    <Item type="Text" name="Emergency Room Services / Urgent Care" id="j"/>    <Item type="Text" name="Hospital Admission Services" id="k"/>    <Item type="Text" name="Chiropractic" id="n"/>    <Item type="Text" name="Prescription Drugs" id="l"/>    <Item type="Text" name="Specialty Drugs" id="o"/>    <Item type="Currency" name="Custom Field 2" id="id_4">$250.00</Item>    <Item type="Boolean" name="Pre Tax Reduction Available" id="t">false</Item>    <Item type="Boolean" name="Conversion Privilege" id="p">false</Item>    <Item type="ItemHeader" name="Plan Setup" id="id_3"/>    <Item type="Termination" name="Benefit Termination Date" id="q">Immediate</Item>    <Item type="Determination" name="Premium Redetermination Date" id="r">Not Applicable</Item>    <Item type="Participation" name="Participation Requirement" id="s"/></xml>

Answer 1

怎么样：

import java.io.File;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;

import org.w3c.dom.NodeList;

public class Demo {

    public static void main(String[] args) throws Exception {

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

        DocumentBuilder db = dbf.newDocumentBuilder();

        Document document = db.parse(new File("input.xml"));

        NodeList nodeList = document.getElementsByTagName("Item");

        for(int x=0,size= nodeList.getLength(); x<size; x++) {

            System.out.println(nodeList.item(x).getAttributes().getNamedItem("name").getNodeValue());

        }

    }

}

Answer 2

我想我明白了。我必须org.w3c.dom.Element明确使用。我也有一个不同的Element字段。

Answer 3

下面是在vtd-xml中执行此操作的代码。它基本上使用“ / xml / item / @ name”的XPath查询XML。

import com.ximpleware.*;

public class getAttrs{

   public static void main(String[] s) throws VTDException{

         VTDGen vg = new VTDGen();

         if (!vg.parseFile("input.xml",false)) // turn off namespace

              return;

         VTDNav vn = vg.getNav();

         AutoPilot ap =  new AutoPilot(vn);

         ap.selectXPath("/xml/item/@name");

         int i=0;

         while( (i=ap.evalXPath())!=-1){

              System.out.println(" item name is ===>"+vn.toString(i+1)); 

         }

   }

}