四、用例:

StudentInfo

/**
 * JDomSample
 */
package com.fhway.jdom;

/**
 * @author fuhw
 * 2006-9-19   下午05:15:00
 */
public class StudentInfo {

 private String number = "";
 private String name = "";
 private String age = "";
 private String familialMembers = "";
 private String fatherName = "";
 private String motherName = "";

 /**
  * @return the age
  */
 public String getAge() {
  return age;
 }
 /**
  * @param age the age to set
  */
 public void setAge(String age) {
  this.age = age;
 }
 /**
  * @return the familialMembers
  */
 public String getFamilialMembers() {
  return familialMembers;
 }
 /**
  * @param familialMembers the familialMembers to set
  */
 public void setFamilialMembers(String familialMembers) {
  this.familialMembers = familialMembers;
 }
 /**
  * @return the fatherName
  */
 public String getFatherName() {
  return fatherName;
 }
 /**
  * @param fatherName the fatherName to set
  */
 public void setFatherName(String fatherName) {
  this.fatherName = fatherName;
 }

 /**
  * @return the motherName
  */
 public String getMotherName() {
  return motherName;
 }
 /**
  * @param motherName the motherName to set
  */
 public void setMotherName(String motherName) {
  this.motherName = motherName;
 }
 /**
  * @return the name
  */
 public String getName() {
  return name;
 }
 /**
  * @param name the name to set
  */
 public void setName(String name) {
  this.name = name;
 }
 /**
  * @return the number
  */
 public String getNumber() {
  return number;
 }
 /**
  * @param number the number to set
  */
 public void setNumber(String number) {
  this.number = number;
 }
 
 
}

JDomSample

/**
 * JDomSample
 */
package com.fhway.jdom;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Iterator;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.Text;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.jdom.xpath.XPath;

/**
 * @author fuhw 2006-9-13 下午04:44:21
 */
public class JDomSample {

 public static void build(String filePath, StudentInfo si) throws Exception {

  Element root, student, number, name, age, familialMembers, fatherName, motherName;

  /* 生成根元素：student-info */
  root = new Element("student-info");

  /* 将根元素植入文档doc中 */
  Document doc = new Document(root);

   /* 生成元素：student(number,name,age) */
   student = new Element("student");
   number = new Element("number");
   name = new Element("name");
   age = new Element("age");
   /* 生成familialMembers元素的子元素fatherName,materName */
   familialMembers = new Element("familialMembers");
   fatherName = new Element("fatherName");
   motherName = new Element("motherName");
   /* 设置属性的值 */
   number.setText(si.getNumber());
   name.setText(si.getName());
   age.setText(si.getAge());
   fatherName.setText(si.getFatherName());
   motherName.setText(si.getMotherName());
   /* 设置元素的节点内容 */
   student.addContent(number);
   student.addContent(name);
   student.addContent(age);
   /* 把fatherName,materName放在familialMembers下面 */
   familialMembers.addContent(fatherName);
   familialMembers.addContent(motherName);
   /* 把familialMembers放在student下面 */
   student.addContent(familialMembers);

   root.addContent(student);

  Format format = Format.getCompactFormat();
  /* 设置xml文件的字符为gb2312 */
  format.setEncoding("gb2312");
  /* 设置xml文件的缩进为4个空格 */
  format.setIndent("    ");
  /* 元素后换行一层元素缩四格 */
  XMLOutputter XMLOut = new XMLOutputter(format);

  XMLOut.output(doc, new FileOutputStream(filePath));

 }

 /**
  * 添加XML文件指定信息
  */
 public static void add(String filePath, StudentInfo si) throws Exception {

  FileInputStream fi = null;
  FileOutputStream fo = null;
  try {
   String path = filePath;
   fi = new FileInputStream(path);
   SAXBuilder sb = new SAXBuilder();
   Document doc = sb.build(fi);
   /* 得到根元素 */
   Element root = doc.getRootElement();
   /* 得到根元素所有子元素的集合 */
   List sis = root.getChildren();

   String number = si.getNumber();
   String name = si.getName();
   String age = si.getAge();
   //   String familialMembers = si.getFamilialMembers();
   String fatherName = si.getFatherName();
   String motherName = si.getMotherName();

   Element newstudent = new Element("student");
   Element newnumber = new Element("number");
   newnumber.setText(number);
   newstudent.addContent(newnumber);

   Element newname = new Element("name");
   newname.setText(name);
   newstudent.addContent(newname);

   Element newage = new Element("age");
   newage.setText(age);
   newstudent.addContent(newage);

   Element familialMembers = new Element("familialMembers");

   Element newfatherName = new Element("fatherName");
   newfatherName.setText(fatherName);
   familialMembers.addContent(newfatherName);

   Element newmotherName = new Element("motherName");
   newmotherName.setText(motherName);
   familialMembers.addContent(newmotherName);

   newstudent.addContent(familialMembers);
   sis.add(newstudent);// 增加子元素

   Format format = Format.getCompactFormat();
   /* 设置xml文件的字符为gb2312 */
   format.setEncoding("gb2312");
   /* 设置xml文件的缩进为4个空格 */
   format.setIndent("    ");
   /* 元素后换行一层元素缩四格 */
   XMLOutputter outp = new XMLOutputter(format);

   fo = new FileOutputStream(path);
   outp.output(doc, fo);
   System.out.println("AddXML is over!");
  } catch (Exception e) {
   System.err.println(e + "error");
  } finally {
   try {
    fi.close();
    fo.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }

 public static void read(String filePath) throws JDOMException, IOException {
  SAXBuilder builder = new SAXBuilder();
  try {
   Document read_doc = builder.build(filePath);
   /* root */
   Element stu = read_doc.getRootElement();
   List list = stu.getChildren("student");
   for (int i = 0; i < list.size(); i++) {
    Element e = (Element) list.get(i);
    String str_number = e.getChildText("number");
    String str_name = e.getChildText("name");
    String str_age = e.getChildText("age");
    /* 取得student元素的子节点元素familialMembers */
    Element f = (Element) e.getChild("familialMembers");
    String str_fatherName = f.getChildText("fatherName");

    System.out.println("---------STUDENT--------------");
    System.out.println("NUMBER:" + str_number);
    System.out.println("NAME:" + str_name);
    System.out.println("AGE:" + str_age);
    System.out.println("fatherName:" + str_fatherName);
    System.out.println("------------------------------");
    System.out.println();
   }
  } catch (IOException ex) {
   System.out.println("IOException" + ex.getMessage());
  } catch (JDOMException je) {
   System.out.println("JDOMException" + je.getMessage());
  }
 }

 /**
  * 修改XML文件指定信息
  */
 public static void edit(String filePath, StudentInfo si) throws Exception {

  FileInputStream fi = null;
  FileOutputStream fo = null;

  try {
   String path = filePath;
   fi = new FileInputStream(path);
   SAXBuilder sb = new SAXBuilder();
   Document doc = sb.build(fi);
   Element root = doc.getRootElement(); // 得到根元素

   List list = root.getChildren(); // 得到根元素所有子元素的集合

   Element student = (Element) list.get(0);

   String number = si.getNumber();
   String name = si.getName();
   String age = si.getAge();
   // String familialMembers = si.getFamilialMembers();
   String fatherName = si.getFatherName();
   String motherName = si.getMotherName();

   System.out.println("fatherName:" + fatherName);

   Element newnumber = student.getChild("number");
   newnumber.setText(number);
   Element newname = student.getChild("name");
   newname.setText(name);
   Element newage = student.getChild("age");
   newage.setText(age);

   Element newfamilialMembers = student.getChild("familialMembers");

   Element newfatherName = (Element) newfamilialMembers
     .getChild("fatherName");
   newfatherName.setText(fatherName);
   Element newmotherName = (Element) newfamilialMembers
     .getChild("motherName");
   newmotherName.setText(motherName);

   XMLOutputter outp = new XMLOutputter();
   fo = new FileOutputStream(path);
   outp.output(doc, fo);
   System.out.println("EditXML is over!");
  } catch (Exception e) {
   System.err.println(e + "error");
  } finally {
   try {
    fi.close();
    fo.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }

 /**
  * 删除XML文件指定信息
  */
 public static void remove(String filePath, int xmlId) throws Exception {

  FileInputStream fi = null;
  FileOutputStream fo = null;
  /* 类型转换 */
  String path = filePath;
  try {
   fi = new FileInputStream(path);
   SAXBuilder sb = new SAXBuilder();
   Document doc = sb.build(fi);
   /* 得到根元素 */
   Element root = doc.getRootElement();
   /* 得到根元素所有子元素的集合 */
   List sis = root.getChildren();
   /* 删除指定位置的子元素 */
   sis.remove(xmlId);

   XMLOutputter outp = new XMLOutputter();
   fo = new FileOutputStream(path);
   outp.output(doc, fo);
   System.out.println("DelXML is over!");
  } catch (Exception e) {
   System.err.println(e + "error");
  } finally {
   try {
    fi.close();
    fo.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
 }

 public static void xpathReader(String filePath) throws IOException,
   JDOMException {

  PrintStream out = System.out;
  SAXBuilder builder = new SAXBuilder();
  try {
   /* 得到Document对象 */
   Document doc = builder.build(new File(filePath));
   // Print servlet information
   /* 选择任意路径下servlet元素 */
   XPath servletPath = XPath.newInstance("//servlet");
   /* 返回所有的servlet元素 */
   List servlets = servletPath.selectNodes(doc);

   out.println("This WAR has " + servlets.size()
     + " registered servlets:");
   Iterator i = servlets.iterator();
   /* 输出servlet信息 */
   while (i.hasNext()) {
    Element servlet = (Element) i.next();
    out.print("\t" + servlet.getChild("servlet-name").getTextTrim()
      + " for "
      + servlet.getChild("servlet-class").getTextTrim());
    List initParams = servlet.getChildren("init-param");
    out.println(" (it has " + initParams.size() + " init params)");
   }
   // Print security role information
   XPath rolePath = XPath
     .newInstance("//security-role/role-name/text()");
   List roleNames = rolePath.selectNodes(doc);// 得到所有的角色名
   if (roleNames.size() == 0) {
    out.println("This WAR contains no roles");
   } else {
    out
      .println("This WAR contains " + roleNames.size()
        + " roles:");
    i = roleNames.iterator();
    while (i.hasNext()) {// 输出角色名
     out.println("\t" + ((Text) i.next()).getTextTrim());
    }
   }
  } catch (IOException ioe) {
   System.out.println(ioe.getStackTrace());
  } catch (JDOMException jde) {
   System.out.println(jde.getStackTrace());
  }
 }

 /**
  * @param args
  * @throws Exception
  */
 public static void main(String[] args) throws Exception {

  String filePath = "";
  StudentInfo si = new StudentInfo();
  si.setNumber("011");
  si.setName("fhwei");
  si.setAge("27");
  si.setFatherName("myFather");
  si.setMotherName("myMother");
  /* 读取文件的的路径 */
  if (args.length == 2) {
   filePath = args[1];
  } else {
   filePath = "studentInfo.xml";
  }
  try{
//   build(filePath, si);
//   read(filePath);
//   edit(filePath, si);
//   read(filePath);
   xpathReader("web.xml");
  }catch(Exception e){
   System.out.println(e.getStackTrace());
  }

 }

}