JDOM使用详解及实例(二)

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());
   }

}

}