现在,我想解析来自webservice的xml.对于解析,我使用了xpath和java.我有以下代码:
package test.client;
import com.sun.org.apache.xpath.internal.NodeSet;
import java.io.FileReader;
import java.io.StringReader;
import javax.lang.model.element.Element;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathFactory;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
public class GetAlarmsCriticalDataCenterLinksDown {
public static void main(String args[]) throws Exception {
try {
GetAlarms ga = new GetAlarms();
String xml = ga.getAlarms(
"Alarms",
"C:/Documents and Settings/Administrator/My Documents/NetBeansprojects/WebSpectrumDemo/src/java/com/xml/Alarms/GetAlarmsCriticalDataCenterLinksDown.xml");
System.out.println("Response XML:\n " + xml);
XPathFactory factory = XPathFactory.newInstance();
XPath xPath = factory.newXPath();
String loc = "";
NodeList nodes = (NodeList) xPath.evaluate(
"//alarm-response-list/alarm-responses/alarm",
new InputSource(new StringReader(xml)),
XPathConstants.NODESET);
System.out.println("Success : " + nodes.getLength());
} catch (Exception e) {
System.out.println(e);
}
}
}
我的String xml看起来像
<?xml version="1.0" encoding="UTF-8"?>
<alarm-response-list xmlns="http://www.ca.com/spectrum/restful/schema/response"
error="EndOfResults" throttle="2" total-alarms="2">
<alarm-responses>
<alarm id="51230f5c-11fe-1002-01bc-000c296b3541">
<attribute id="0x1006e">HBBCPMPLSR1.hdfcami.com</attribute>
<attribute id="0x11f84" error="NoSuchAttribute" />
<attribute id="0x118cd" />
<attribute id="0x11f4e">1361252188</attribute>
</alarm>
<alarm id="512313db-c5ee-1003-01bc-000c296b3541">
<attribute id="0x1006e">HBBCPINTR0.hdfcami.com</attribute>
<attribute id="0x11f84" error="NoSuchAttribute" />
<attribute id="0x118cd" />
<attribute id="0x11f4e">1361253339</attribute>
</alarm>
</alarm-responses>
</alarm-response-list>
但是我被困住了.我正在获取nodes.getLength()= 0.
解决方法:
您需要在XPath对象上设置名称空间.使用XPath.setNamespaceContext()执行此操作.另外,您也可以在XPath表达式中使用本地名称,例如// * [local-name()=’alarm-response-list’] / * [local-name()=’alarm-responses’] / * [local-name()=’alarm’],但命名空间选项更好.
关于将名称空间与XPath表达式一起使用的大量信息已经在另一个答案here中了.
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