##介绍
利用org.w3c.dom来操作xml文件相当的简单，今天自己简单的练习了一下。
代码
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| import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
public class DomXml {
//读取 XML 文件
private static void readXMLFile(String path){
try {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = dbf.newDocumentBuilder();
Document doc = builder.parse(path); // 获取到xml文件
// 下面开始读取
Element root = doc.getDocumentElement(); // 获取根元素
NodeList nodeList = root.getChildNodes();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = (Node) nodeList.item(i);
if (node instanceof Element){
Element ss = (Element) node;
System.out.println(ss.getAttribute("username"));
System.out.println(ss.getAttribute("password"));
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
// 写入ｘｍｌ文件
public static void callWriteXmlFile(Document doc, Writer w, String encoding) {
try {
Source source = new DOMSource(doc);
Result result = new StreamResult(w);
Transformer xformer = TransformerFactory.newInstance()
.newTransformer();
xformer.setOutputProperty(OutputKeys.ENCODING, encoding);
xformer.transform(source, result);
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
}
}
private static void writeXMLFile(String path,List<User> list) {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try {
builder = dbf.newDocumentBuilder();
} catch (Exception e) {
}
Document doc = builder.newDocument();
System.out.println(list.size());
Element root = doc.createElement("osee");
doc.appendChild(root); // 将根元素添加到文档上
for (User u : list) {
Element stu = doc.createElement("user");
stu.setAttribute("password", u.getPassword());
stu.setAttribute("username", u.getUsername());
root.appendChild(stu);// 添加属性
}
try {
FileOutputStream fos = new FileOutputStream(path);
OutputStreamWriter outwriter = new OutputStreamWriter(fos);
callWriteXmlFile(doc, outwriter, "utf-8");
outwriter.close();
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
|
