import java.io.FileWriter;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class DOM4JTest {
/** */
/** */
/** */
/**
* DOM4J讀寫XML示例
*
* @param args
* @throws Exception
*/
public static void main(String[] args) {
try {
XMLWriter writer = null;// 聲明寫XML的對象
SAXReader reader = new SAXReader();
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK");// 設置XML文件的編碼格式
String filePath = "d:\\student.xml";
File file = new File(filePath);
if (file.exists()) {
Document document = reader.read(file);// 讀取XML文件
Element root = document.getRootElement();// 得到根節點
boolean bl = false;
for (Iterator i = root.elementIterator("學生"); i.hasNext();) {
Element student = (Element) i.next();
if (student.attributeValue("sid").equals("001")) {
// 修改學生sid=001的學生信息
student.selectSingleNode("姓名").setText("王五");
student.selectSingleNode("年齡").setText("25");
writer = new XMLWriter(new FileWriter(filePath), format);
writer.write(document);
writer.close();
bl = true;
break;
}
}
if (bl) {
// 添加一個學生信息
Element student = root.addElement("學生");
student.addAttribute("sid", "100");
Element sid = student.addElement("編號");
sid.setText("100");
Element name = student.addElement("姓名");
name.setText("嘎嘎");
Element sex = student.addElement("性別");
sex.setText("男");
Element age = student.addElement("年齡");
age.setText("21");
writer = new XMLWriter(new FileWriter(filePath), format);
writer.write(document);
writer.close();
}
} else {
// 新建student.xml文件並新增內容
Document _document = DocumentHelper.createDocument();
Element _root = _document.addElement("學生信息");
Element _student = _root.addElement("學生");
_student.addAttribute("sid", "001");
Element _id = _student.addElement("編號");
_id.setText("001");
Element _name = _student.addElement("姓名");
_name.setText("灰機");
Element _age = _student.addElement("年齡");
_age.setText("18");
writer = new XMLWriter(new FileWriter(file), format);
writer.write(_document);
writer.close();
}
System.out.println("操作結束! ");
} catch (Exception e) {
e.printStackTrace();
}
}
}
執行結果應該是這樣:
循環解析節點:
try {
Document authtmp = DocumentHelper.parseText(xml);
List<Element> list = authtmp.selectNodes("//sms/node");
for (int j = 0; j < list.size(); j++) {
Element node = (Element) list.get(j);
nodeByNodes(node);
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void nodeByNodes(Element node) {
if (node.element("node") != null) {
String id = node.attributeValue("id");
String name = node.attributeValue("name");
System.out.print(id + "-------");
System.out.println(name);
for (Iterator i = node.elementIterator("node"); i.hasNext();) {
Element newNode = (Element) i.next();
nodeByNodes(newNode);
}
} else {
String id = node.attributeValue("id");
String name = node.attributeValue("name");
System.out.print(id + "-------");
System.out.println(name);
}
}