Java:使用DOM4j来实现读写XML文件中的属性和元素
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内容图文
DOM4可以读取和添加XML文件的属性或者元素
读取属性:
public static void ReadAttributes() throws DocumentException {
File file = new File("D:\\cmz\\java\\XMLTest\\Customertest.xml");
SAXReader reader = new SAXReader();
Document doc = reader.read(file);
Element root = doc.getRootElement();
try {
for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {
Element element = (Element) iterator.next();
String CustomerID = element.attributeValue("CustomerID");
System.out.println("CustomerID = " + CustomerID);
String CompanyName = element.attributeValue("CompanyName");
System.out.println("CompanyName = " + CompanyName);
System.out.println("ContactName = "
+ element.attributeValue("ContactName"));
System.out.println("ContactTitle = "
+ element.attributeValue("ContactTitle"));
System.out.println("Address = "
+ element.attributeValue("Address"));
System.out.println("City = " + element.attributeValue("City"));
System.out.println("PostalCode = "
+ element.attributeValue("PostalCode"));
System.out.println("Country = "
+ element.attributeValue("Country"));
System.out
.println("Phone = " + element.attributeValue("Phone"));
System.out.println("Fax = " + element.attributeValue("Fax"));
System.out
.println("--------------------------------------------------------\t");
}
} catch (Exception e) {
// TODO: handle exception
}
}读取元素:
public static void ReadInnerTest() throws DocumentException {
File file = new File("D:\\cmz\\java\\XMLTest\\Customer1.xml");
SAXReader reader = new SAXReader();
Document doc = reader.read(file);
Element root = doc.getRootElement();
try {
for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {
Element type = (Element) iterator.next();
System.out.println(type.elementText("CustomerID"));
System.out.println(type.elementText("CompanyName"));
System.out.println(type.elementText("ContactName"));
System.out.println(type.elementText("ContactTitle"));
System.out.println(type.elementText("Address"));
System.out.println(type.elementText("City"));
System.out.println(type.elementText("PostalCode"));
System.out.println(type.elementText("Country"));
System.out.println(type.elementText("Phone"));
System.out.println(type.elementText("Fax"));
System.out.println("---------------------------------\t");
}
} catch (Exception e) {
// TODO: handle exception
}
}
-----
写入属性:
public static void WriteAttributes() {
Document doc = DocumentHelper.createDocument();
Element ele = doc.addElement("table");
for (int i = 1; i < 5; i++) {
Element Customers = ele.addElement("Customers");
Customers.addAttribute("CustomerID", "ALFKI" + i);
Customers.addAttribute("CompanyName", "Alfreds Futterkiste" + i);
Customers.addAttribute("ContactName", "Maria Anders" + i);
Customers.addAttribute("ContactTitle", "Sales Representative" + i);
Customers.addAttribute("Address", "Obere Str. 57");
Customers.addAttribute("City", "beijin");
Customers.addAttribute("PostalCode", "12209");
Customers.addAttribute("Country", "Germany");
Customers.addAttribute("Phone", "030-0074321");
Customers.addAttribute("Fax", "030-0076545");
try {
XMLWriter writer = new XMLWriter(new FileWriter(new File(
"Customertest.xml")));
writer.write(doc);
writer.close();
} catch (Exception e) {
// TODO: handle exception
}
}
}写出元素:
public static void writeInnerTest(){
Document doc = DocumentHelper.createDocument();
Element ele = doc.addElement("table");
for (int i = 1; i < 5; i++) {
Element Customers = ele.addElement("row");
Element CustomerID = ele.addElement("CustomerID");
CustomerID.setText("ALFKI" + i);
Element CompanyName = ele.addElement("CompanyName");
CompanyName.setText("Alfreds Futterkiste" + i);
Element ContactName = ele.addElement("ContactName");
ContactName.setText("Maria Anders" + i);
Element ContactTitle = ele.addElement("ContactTitle");
ContactTitle.setText("Sales Representative" + i);
Element Address = ele.addElement("Address");
Address.setText("Obere Str. 57");
Element City = ele.addElement("City");
City.setText("beijin");
Element PostalCode = ele.addElement("PostalCode");
PostalCode.setText("12209");
Element Country = ele.addElement("Country");
Country.setText("Germany");
Element Phone = ele.addElement("Phone");
Phone.setText("030-0074321");
Element Fax = ele.addElement("Fax");
Fax.setText("030-0076545");
}
try {
XMLWriter writer = new XMLWriter(new FileWriter(new File(
"Customertest2.xml")));
writer.write(doc);
writer.close();
} catch (Exception e) {
// TODO: handle exception
}
}可以修改属性的文本内容:
public static void ReadUpdateattribute() throws DocumentException{
File file = new File("D:\\cmz\\java\\XMLTest\\Customertest.xml");
SAXReader reader = new SAXReader();
Document doc = reader.read(file);
Element root = doc.getRootElement();
try {
for (Iterator iterator = root.elementIterator("Customers"); iterator.hasNext();) {
Element element = (Element) iterator.next();
String name = "ALFKI1";
if (name.equals(element.attributeValue("CustomerID")) ) {
Attribute attr = element.attribute("CustomerID");
attr.setValue("234");
Element ContactName = element.addElement("23424");
ContactName.setText("676767" );
}
}
XMLWriter writer = new XMLWriter(new FileOutputStream(file));
writer.write(doc);
ReadAttributes();
} catch (Exception e) {
// TODO: handle exception
}
}内容总结
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