输出在下面的屏幕快照中,部分正常。但是我只想显示标记中的节点,如输出所示,但是这里重复标记的数量。每个反应器仅应显示3个结果。输出是预期的,但结果显示出比平常更多。
循环有什么问题?请帮助。
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
public class Javatracer {
public static void main(String args[])
{
try
{
File file = new File("trace.xml");
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(file);
doc.getDocumentElement().normalize();
System.out.println("Root element: " + doc.getDocumentElement().getNodeName());
NodeList nodeList = doc.getElementsByTagName("actor");
for (int itr = 0; itr < nodeList.getLength(); itr++)
{
Node node = nodeList.item(itr);
System.out.println("\nNode Name :" + node.getNodeName());
if (node.getNodeType() == Node.ELEMENT_NODE)
{
NodeList portnodeList = doc.getElementsByTagName("port");
for (int portitr = 0; portitr < portnodeList.getLength(); portitr++)
{
Node portnode = portnodeList.item(portitr);
Element portElement = (Element) portnode;
System.out.println("Channel Name: "+ portElement.getAttribute("name")+" "
+ "| Channel Type: "+ portElement.getAttribute("type")+" | "
+ "Channel Rate: "+ portElement.getAttribute("rate"));
}
}
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
这是xml文件:
<?xml version="1.0" encoding="UTF-8"?>
<sdf3 version="1.0" type="csdf">
<applicationGraph name="noname">
<csdf name="noname" type="noname">
<actor name="micf_0" type="a">
<port name="in_channel_1" type="out" rate="16"/>
<port name="in_channel_2" type="out" rate="16"/>
<port name="in_channel_3" type="out" rate="16"/>
</actor>
<actor name="micf_1" type="b">
<port name="in_channel_1" type="out" rate="16"/>
<port name="in_channel_2" type="out" rate="16"/>
<port name="in_channel_3" type="out" rate="16"/>
</actor>
<actor name="micf_1" type="b">
<port name="in_channel_1" type="out" rate="16"/>
<port name="in_channel_2" type="out" rate="16"/>
<port name="in_channel_3" type="out" rate="16"/>
</actor>
<actor name="micf_1" type="b">
<port name="in_channel_1" type="out" rate="16"/>
<port name="in_channel_2" type="out" rate="16"/>
<port name="in_channel_3" type="out" rate="16"/>
</actor>
<actor name="micf_1" type="b">
<port name="in_channel_1" type="out" rate="16"/>
<port name="in_channel_2" type="out" rate="16"/>
<port name="in_channel_3" type="out" rate="16"/>
</actor>
</csdf>
</sdf3>
当您调用getElementsByTagName()
时,请勿在文档上调用它,而在父节点上调用它。
当您在doc
上调用方法时,它将在整个文档中扫描该名称的元素。
当您在node
中调用方法时,它将仅扫描该节点的子元素以查找具有该名称的元素。
因此,更改此行:
NodeList portnodeList = doc.getElementsByTagName("port");
为此:
NodeList portnodeList = ((Element) node).getElementsByTagName("port");