import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List;
import org.dom4j.Attribute;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;
publicclass Dom4jDemo {
publicboolean createXML(String fileName){
boolean isOk=false;
//建立document對(duì)象
Document doc= DocumentHelper.createDocument();
//建立XML文檔的根books
Element students= doc.addElement("students");
students.addComment("This is a test for dom4j");//加入一行注釋
/**加入第一個(gè)student節(jié)點(diǎn)*/
Element student= students.addElement("student");//加入第一個(gè)student節(jié)點(diǎn)
student.addAttribute("value","god");//加入value屬性和值
Element name= student.addElement("name");//加入name節(jié)點(diǎn)
name.setText("finina");//為name設(shè)置值
Element age=student.addElement("age");//加入age節(jié)點(diǎn)
age.setText("25");//
為age設(shè)置值
Element sex=student.addElement("sex");//加入sex節(jié)點(diǎn)
sex.setText("male");//為sex設(shè)置值
/**加入第二個(gè)student節(jié)點(diǎn)*/
student= students.addElement("student");
student.addAttribute("value","cat");
name= student.addElement("name");
name.setText("fly");
age=student.addElement("age");
age.setText("17");
sex=student.addElement("sex");
sex.setText("female");
/**加入team節(jié)點(diǎn)*/
Element team=students.addElement("team");
team.addText("05093A");
/**
*將doc中的內(nèi)容寫入xml文件中
**/
try{
OutputFormat format= OutputFormat.createPrettyPrint();//設(shè)置格式
format.setEncoding("GBK");//必要，否則無(wú)法解析中文
//輸出為文件
XMLWriter writer=new XMLWriter(new FileWriter(fileName),format);
writer.write(doc);
writer.flush();
//
isOk=true;
}catch(Exception e){
e.printStackTrace();
}
return isOk;
}
publicboolean modifigXML(String oldFileName,String newFileName){
boolean isOk=false;
try{
SAXReader reader=new SAXReader();//創(chuàng)建SAX閱讀器
Document doc= reader.read(new File(oldFileName));//將所有文件內(nèi)容讀取生存Document對(duì)象
/**修改內(nèi)容之一: 如果student節(jié)點(diǎn)中value屬性的內(nèi)容為god,則修改成king
*因?yàn)樽鋈瞬荒芴珖虖?br />
*/
List list= doc.selectNodes("/students/student/@value");//搜索出所有位于students節(jié)點(diǎn)下的student節(jié)點(diǎn)中的value屬性位置放入集合中
Iterator iter= list.iterator();//加載迭代器
//迭代集合
while(iter.hasNext()){
Attribute attr= (Attribute)iter.next();
if(attr.getValue().equals("god"))//比對(duì)值是否相等
attr.setValue("king");//設(shè)置值
}
list= doc.selectNodes("/students/team");//搜索出所有位于students節(jié)點(diǎn)下team節(jié)點(diǎn)位置放入集合中
iter= list.iterator();//an style="COLOR: #008000">加載迭代器
//迭代集合
if(iter.hasNext()){
Element team= (Element)iter.next();
team.setText("05084A");//設(shè)置值
Element teacher= team.addElement("teacher");//添加節(jié)點(diǎn)
teacher.setText("godfather");//為新的節(jié)點(diǎn)設(shè)置值
teacher.addAttribute("skill","programme");//為新的節(jié)點(diǎn)添加屬性
}
/**修改內(nèi)容之三: 若age內(nèi)容為17,則刪除該節(jié)點(diǎn)
*未成年人需要被保護(hù)...
*/
list= doc.selectNodes("/students/student");//搜索出所有位于students節(jié)點(diǎn)下的student節(jié)點(diǎn)位置放入集合中
iter= list.iterator();//加載迭代器
//迭代集合
while(iter.hasNext()){
Element elem= (Element)iter.next();
Iterator iterElem= elem.elementIterator("age");//將該節(jié)點(diǎn)下所有的age節(jié)點(diǎn)生成一個(gè)迭代器
//迭代集合
if(iterElem.hasNext()){
Element remTitle= (Element)iterElem.next();
if(remTitle.getText().equals("17"))000">//
對(duì)比值
elem.remove(remTitle);//移除該節(jié)點(diǎn)
}
}
//將doc中的內(nèi)容寫入文件中
OutputFormat format= OutputFormat.createPrettyPrint();//設(shè)置格式
format.setEncoding("GBK");//必要，否則無(wú)法解析中文
//輸出為文件，以上操作只是在內(nèi)存中修改，需要保存為文件來(lái)確認(rèn)修改
XMLWriter writer=new XMLWriter(new FileWriter(newFileName),format);
writer.write(doc);
writer.flush();
isOk=true;
}catch(Exception e){
e.printStackTrace();
}
return isOk;
}
/**
*the method readXML
*/
publicvoid readXML(String fileName){
try{
File file=new File(fileName);//創(chuàng)建文件對(duì)象
SAXReader reader=new SAXReader();//創(chuàng)建SAX閱讀器
Document doc= reader.read(file);//讀取內(nèi)容生成Document對(duì)象
Element root= doc.getRootElement();//取得根節(jié)點(diǎn)
search(root);//開始遍歷
}catch(Exception e){
e.printStackTrace();
}
}
//遞歸遍歷
privatevoid search(Element root) {
Iterator it_element
= root.elementIterator();//將根節(jié)點(diǎn)下包含的元素組織成一個(gè)迭代器
//迭代
while( it_element.hasNext()) {
Element element= (Element)it_element.next();
if(!element.getText().equals(""))
{
System.out.println(element.getName()+"節(jié)點(diǎn)的值是"+element.getText());
}
else
{
System.out.println(element.getName()+"節(jié)點(diǎn)");
}
Iterator it_attr= element.attributeIterator();
while( it_attr.hasNext()) {
Attribute attr= (Attribute)it_attr.next();
if(attr!=null)
{
System.out.println(element.getName()+"節(jié)點(diǎn)的屬性"+attr.getName()+"的值是"+ attr.getValue());
}
}
search(element);//遞歸調(diào)用
}
}
/**
*the method main
*/
publicstaticvoid main(String[] args){
long start= System.currentTimeMillis();//開始計(jì)時(shí)
Dom4jDemo dom4jDemo=new Dom4jDemo();
String fileName="dom4jDemo.xml";
String newFileName#000000">=
"new_dom4jDemo.xml";
System.out.println(fileName+"正在創(chuàng)建中...");
boolean isOk_create= dom4jDemo.createXML(fileName);
if(isOk_create) System.out.println(fileName+"創(chuàng)建成功!");
else System.out.println("創(chuàng)建失敗!請(qǐng)檢查后重新再試!");
System.out.println("正在更新中...");
boolean isOk_modi= dom4jDemo.modifigXML(fileName, newFileName);
if(isOk_modi) System.out.println("恭喜,更新完成!");
//
System.out.println("正在讀取文件"+fileName+" ...");
System.out.println("------------------------------------------------");
dom4jDemo.readXML(fileName);
System.out.println("------------------------------------------------");
System.out.println(fileName+"讀取成功!");
System.out.println("正在讀取文件"+newFileName+" ...");
System.out.println("------------------------------------------------");
dom4jDemo.readXML(newFileName);
System.out.println("------------------------------------------------");
System.out.println(fileName+"讀取成功!");
System.out.println("一共耗時(shí)："+(System.currentTimeMillis()-start)+"毫秒!");
}
}