java http xml java通过http来访问一个xml文件的读取过程-优快云博客

本文链接：https://blog.youkuaiyun.com/hxdafei1989/article/details/69382249

这篇博客展示了如何使用Java通过HTTP请求获取XML文件，并利用DOM解析器解析XML内容，提取特定元素如Vulinfo、ID、Title、Description等信息的过程。

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上代码

package test;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

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.NodeList;
import org.xml.sax.SAXException;

public class XmlController {

public static void main(String arg[]) {

InputStream is = null;
Document document = null;
try {
URL url =
new URL("http://xxxx?method=getInfo&Id=001");
URLConnection con = url.openConnection();
is = con.getInputStream();
// DOM 解析器
DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();
// DOM 工厂获得 DOM 解析器
DocumentBuilder dombuilder = domfac.newDocumentBuilder();
document = dombuilder.parse(is);

} catch (SAXException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();

}
// root要素取得
Element elementRoot = (document).getDocumentElement();

Element elementCount = (Element) elementRoot.getElementsByTagName("Vulinfo").item(0);

System.out.println(elementCount.getNodeName());
System.out.println(elementCount.getElementsByTagName("ID").item(0).getNodeName());
System.out.println(
elementCount.getElementsByTagName("ID").item(0).getFirstChild().getNodeValue());

Element Data = (Element) elementCount.getElementsByTagName("Data").item(0);

String title =
eleVulinfoData.getElementsByTagName("Title").item(0).getFirstChild().getNodeValue();
System.out.println(title);

Element DescriptionData =
(Element) eleVulinfoData.getElementsByTagName("Description").item(0);
String Description = VulinfoDescriptionData.getElementsByTagName("Overview").item(0)
.getFirstChild().getNodeValue();
System.out.println(Description);

Element AffectedData = (Element) eleVulinfoData.getElementsByTagName("Affected").item(0);
Element AffectedItem = (Element) AffectedData.getElementsByTagName("AffectedItem").item(0);
String AffectedData_Name =
AffectedItem.getElementsByTagName("Name").item(0).getFirstChild().getNodeValue();
System.out.println(AffectedData_Name);
String ProductName =
AffectedItem.getElementsByTagName("ProductName").item(0).getFirstChild().getNodeValue();
System.out.println(ProductName);

NodeList VersionNumber = elementCount.getElementsByTagName("VersionNumber");
System.out.println(VersionNumber.getLength());
for (int i = 0; i < VersionNumber.getLength(); i++) {
Element elementItemName = (Element) VersionNumber.item(i);
String itemName = elementItemName.getFirstChild().getNodeValue();
System.out.println(itemName);
}

// History
Element HistoryData = (Element) eleVulinfoData.getElementsByTagName("History").item(0);
Element HistoryItem = (Element) HistoryData.getElementsByTagName("HistoryItem").item(0);
String Description = null;
System.out.println(HistoryItem.getElementsByTagName("Description").getLength());
if (null != HistoryItem.getElementsByTagName("Description")
&& HistoryItem.getElementsByTagName("Description").getLength() != 0
&& null != HistoryItem.getElementsByTagName("Description").item(0).getFirstChild()) {
Description =
HistoryItem.getElementsByTagName("Description").item(0).getFirstChild().getNodeValue();
}
System.out.println(Description);

}
}